Title of Invention	A LOW PH SKIN CARE COSMETIC COMPOSITION
Abstract	A stable, low pH cosmetic skin care composition comprising cationic salt of amido amine, high molecular weight fatty acid and optionally involving non-ionic emulsifiers with improved sensory properties such as the sensory properties of vanishing creams and the like wherein the said higher molecular weight fatty acids and cationic salts of amido amine favours in attaining the desired sensory profile of the said skin care composition and also beneficially aid in incorporating higher levels of skin benefiting actives including acidic skin care actives in association with cosmetically acceptable vehicle in such skin care formulations and yet be stable.

Title of Invention

A LOW PH SKIN CARE COSMETIC COMPOSITION

Abstract

A stable, low pH cosmetic skin care composition comprising cationic salt of amido amine, high molecular weight fatty acid and optionally involving non-ionic emulsifiers with improved sensory properties such as the sensory properties of vanishing creams and the like wherein the said higher molecular weight fatty acids and cationic salts of amido amine favours in attaining the desired sensory profile of the said skin care composition and also beneficially aid in incorporating higher levels of skin benefiting actives including acidic skin care actives in association with cosmetically acceptable vehicle in such skin care formulations and yet be stable.

Full Text	FIELD OF THE INVENTION The present invention relates to a skin care composition, and more specifically, relates to a stable low pH cosmetic skin care composition comprising of cationic salt of amido amine, high molecular weight fatty acid and optionally involving non-ionic emulsifiers with improved sensory properties such as the sensory properties of vanishing creams and the like. most advantageously, the Incorporation of the higher molecular weight fatty acids and cationic salts of amido amine favours in attaining the desired sensory profile of the said skin care composition of the present invention and beneficially aid In incorporating higher levels of skin benefiting actives including acidic skin care actives in association with cosmetically acceptable vehicle in skin care formulations and yet be stable. BACKGROUND ART There is an increasing demand nowadays for skin compatible cosmetic preparations with lower irritancy and sensorial properties equivalent to vanishing cream. The traditionally used vanishing cream is dominated with high levels of fatty acid and alkali metal soap as an emulsifier which is important for physical stability of the product. However the presence of soap Increases the pH value of the product and the cosmetic composition becomes alkaline. Such a product is stable only under alkaline condition. The surfaces of human skin are normally having pH of 4.0- 6.0, Upon contact with an alkaline substance, the skin secretes acidic substances to restore the normal pH lvalue. This process results in disturbance to the skin physiology and causes secretions such as sebum, sweat etc. resulting in skin irritation. Accordingly, it is desired that cosmetics such as creams, lotions etc. when applied to the skin are conditioned to be weakly acidic or to be of neutral pH while maintaining the characteristics of the traditional vanishing cream. On incorporation of acidic skin benefiting agent such as the alpha and beta hydroxy acids, the said anionic fatty soap emulsifier gets dissociated to its corresponding fatty acid and alkali metal salt of acidic skin benefiting agents. This in turn results in drop in pH and thereby causes physical instability. The lack of physical stability of the fatty acid soap emulsified vanishing creams at low pH is a disadvantage that restricts the use of valuable acidic beneficial actives, such as alpha-beta hydroxy carboxylic acids, because the said beneficial acidic actives dissociate tlie fatty acid soap emulsifier and adds to the Instability of the composition. A wide variety of acidic skin benefiting compounds such as hydroxy acids are used In i the formulations of vanishing cream, stabilized with anionic and non Ionic emulsifier. US Patent 6979452 B2 (Yan Zhou, et al) discloses low pH, high skin friction cosmetic cream containing solid asymmetric particles, an anionic emulsifier and a cosmetically I acceptable vehicle. It describes the extensive use of ethoxyiated non-ionic surfactants such as ethoxyiated aikyi ether, ethoxyiated sorbitan esters, ethoxyiated ; fatty alcohols and ethoxyiated fatty acid esters. The anionic emuisifiers are selected from sulphates, sulphonates, succinates, isothionates, sarcosinates and taurates. I Sodium cetostearyl sulphate has been used as an exemplary anionic emulsifier in the said prior art and the acidic skin benefit agents encompasses alpha & beta hydroxy acids namely glycollc, lactic and salicylic acid. Although these compositions are described to be stable at low pH giving desired sensory properties, the irritancy level of emuisifiers have not been realized. It is known that sulphates and sulphonates based anionic emuisifiers exhibit a high irritancy potential as also mentioned in US patent 4,536,519 by Suzuki et al., wherein an emulsified system prepared with a higher levels of alcohol sulphate has a drawback of imparting excessively high Irritations to the skin along with the instability that is imparted to such systems due to gradual hydrolysis of the said alcohol sulphate with time. Uses of Polyethylene Glycol (PEG) derived nonionic emuisifiers also increase the risk of skin irritation. The cumulative irritancy of the I said emuisifiers present along with other skin benefiting agents are thus often discouraged from usage in such skin care compositions and particularly discouraged for those having sensitive skin. Therefore it is a long felt need to provide for a composition pertaining to skin care that is not only stable at low pH but has desired sensory characteristics along with a reduced risk of skin Irritations due to the presence of the emuisifiers in such skin care compositions. US patent 6,153,177 (Bartolone et al.) discloses vanishing creams which are formulated to Include alkali or alkaline earth metal salts of alpha-hydroxy carboxylic acids In order to achieve skin lightening properties having pH of above 5. The salts of alpha- hydroxy carboxylic acids and not the direct acids were incorporated In the said I prior art to avoid instability in emulsions. The said salt of the acidic skin benefiting agents thus reduces the efficacy of the acidic sl(in benefiting agents. U.S Patent 4, 536,519 (Suzuki et al.) uses a neutralized phosphoric ester as an emulsifler, a nonionic surfactant with HLB less than six and fatty components at neutral or weakly acidic pH. These compositions lack the sensory characteristics that are due to the lack of proper emulsifler systems. WO 01/70188 (Dwiwahyu et al.) disclose a low pH (1-6.5) non-acid soap vanishing ' cream with enhanced stability and skin benefit properties. A C8-C22 fatty acid substituted saccharide is used to stabilize the low pH stearic acid based vanishing cream. These compositions again lack the sensory characteristics due to the lack of proper emulsifler systems. As apparent, the above discussed prior art describes the extensive use of anionic and non-ionic emulsifler to maintain the stability of the skin care compositions containing high molecular weight fatty acid to give vanishing cream like feel . Anionic emulsifler carries a negative charge; tend to raise the skin pH above its normal value 4.0 to 6.0. Anionic emulsiflers have been demonstrated to cause damage to the stratum corneum barrier wherein SLS (sodium lauryl sulphate) in being an anionic surfactant is used as positive control In skin irritancy tests. Skin care compositions containing cationic emulsiflers are well known due to the unique sensory profile that these emulsiflers provide at lower pH. They carry positive charge and are thus advantageous in light of the negatively charged characteristic of the skin. Cationic emulsiflers provide a smooth powdery feel and allow incorporating high level of active ingredients in the composition and increased active ingredient delivery to the skin because of its cationic nature (Klus Jenny & Anna Howe, Soaps Perfumery 8i Cosmetics April 2008). Chang et al. in US patent application 2008/0020005A1 discloses a composition containing a nonionic, cationic emulsifler combination and polar emollient system to reduce the irritancy of Alpha Hydroxy acid ( AHA) and also to enable the sustained release of AHA. The disadvantage of the composition rests with the polar emollient system selected for this composition that does not impart vanishing cream iii Epstein et al. in US Patent 5759558 is directed to a cationic emulsifier in oil-in-water emulsion incorporated in the composition that is well accepted and popular in marlcet for its excellent tactile properties of the said composition, marketed under the brand CUREL by Bausch and Lomb. The said patent also describes composition containing an AHA (Alpha Hydroxy Acid), cationic emulsifier, mineral oil and petrolatum used for moisturizing and giving conditioning benefits to the skin. The disadvantage of the composition lies in the absence of vanishing cream like characteristics due to selection of mineral oil base which gives the shiny and oily look to the skin. Struewing in US patent 5654341 discloses a low pH skin treatment composition ; containing cationic surfactant, fatty acid and hydrocarbon component in oil-in-water ] emulsion. It further describes addition of fatty acid to the cationic surfactant to form a complex which prevents the cationic surfactant from irritating the skin, and at the same time reduces the pH of the composition but does not provide any vanishing cream like sensory characteristics due to the complete reaction of fatty acid with cationic surfactant. It would be clearly apparent from the above existing state of the art and related discussions that although several efficacious skin care compositions are known, it is difficult to provide for compositions which could strike the baldbetween the vanishing characteristics of the said skin care composition in association to the reduced level of skin irritancy, unique sensory profile at lower pH and increased active ingredient delivery to the skin. Thus as is evident, there is a strong need in the art to provide for a balanced cosmetic skin care composition that would Include important skin care actives such as alpha & beta hydroxy acids and in spite of such inclusion of the said actives would possess compatible pH, would further possess compatible pH in spite of the use of bther acidic ingredients, and would yet further possess required sensory properties like those of vanishing creams with low skin irritancy potential. OBJECTS OF THE INVENTION It is thus the basic object of the present invention to provide a iow pH skin care composition comprising catlonic salt of amido amine, high molecular weight fatty acid and optionally one or more of non-ionic emulsifier, that would enable incorporation of other skin benefiting acid ingredients in skin care cosmetic compositions to impart improved sensory properties such as the sensory properties of vanishing cream to the said skin care composition. It is another object of the present invention to provide for a balanced skin care ; cosmetic composition with skin compatible pH even on the inclusion of high level of free fatty acids along with skin care actives such as alpha & beta hydroxy acids with required sensory properties like those of vanishing creams, and with low skin irritancy potential. Yet another object of the present invention is directed to provide low pH skin care cosmetic composition that would facilitate the restriction of the skin pH within the beneficial range unlike the skin care compositions comprising anionic surfactants whereby the skin pH rises above its normal value due to the incorporation of such said anionic surfactants. Yet another object of the present invention is to provide said skin care cosmetic compositions with low pH comprising catlonic salt of amido amine to thereby replace the anionic emulsifiers in the said composition along with its associated disadvantages further comprising additional high molecular weight fatty acid ingredient such as free fatty acids attributing vanishing cream like sensory properties. It is a further object of the invention to provide such said skin care cosmetic compositions with low pH, comprising catlonic salt of amido amine, high molecular weight fatty acid ingredients further in combination with acidic skin benefiting actives such as alpha and beta hydroxy acids. Still another object of the invention is to provide for stable skin care cosmetic compositions with low pH comprising emulsifier such as catlonic salt of amido amine which is formed insitu and optionaily one or more non-ionic emulsifier, in addition to the above said ingredients to attain the desired sensory profile of the said skin care composition that further aids in incorporating higher levels of skin benefiting actives and yet be stable with low skin irritancy. SUMMARY OF THE INVENTION Thus according to the basic aspect of the invention there is provided a low pH (pH = 3.0-6.0) cosmetic skin care composition comprising of (a) an emulsifier system obtained from one or more cationic salts of amldo amines and optionally one or more : non-ionic emulsifier, (b) at least one high molecular weight fatty acid in amounts of 6-22% by weight of the composition and (c) a cosmetically acceptable vehicle with or without other skin benefiting agents including acidic skin care agents. In accordance with a preferred aspect of the invention there is provided a low pH skin care cosmetic composition comprising of: a) an emulsifier system comprising one or more cationic salts of amido amines in the range of 0.1% to about 2% by wt. of the composition, and optionally one or more non-ionic emulsifier in the range of from 0.01% to 10% by wt. of the composition; b) at least one high molecular weight fatty acid ingredient in at least 6 % by weight of the composition; and c) a cosmetically acceptable vehicle with or without other skin benefiting agents including acidic skin care agents. In accordance with another preferred aspect of the Invention there is provided a low pH cosmetic skin care composition wherein the said emulsifier system comprising of cationic amido amine salts is obtained from (a) amido amine (s) in the range of 0.1% to 2%, preferably 0.5% to 1.5% by weight of the said composition and preferably selected from amido amine of the formula R1 -C(0)-l\IH(CH2)n - R wherein R = C7 - C23 Aliphatic hydrocarbon radical, R = dialkylamino or a heterocyclic amino group and n = 2, 3 more preferably C16-C22 alkyl amidopropyl dimethyl amine and (b) low molecular weight inorganic or organic acidic neutralizer (s) in the range of 0.01% to about 2%, preferably 0.05% to 0.75% by weight of the said composition and preferably selected from acids having groups such as -OH, -CI, -NH2, "C=C-, aliphatic, aromatic and exemplified by acids such as glycolic acid. lactic acid, 2-hydroxy octanolc acid, salicylic acid, citric acid, malic acid, maieic acid, hydrociiioric acid, amino acids, benzoic acid, acetic acid, propionic acid and the like and combinations tiiereof. In accordance witli yet anotiier preferred aspect of the invention there is provided a low pH sicin care cosmetic composition wherein the said optional non-ionic emulsifier in the range of from 0.01% to 10% by wt. of the composition preferably selected form the group of sucrose esters and alkyl glucosides and is present preferably in i about 0.5% to about 5%, more preferably about 0.75 % to 2.5% by wt. of the composition I In accordance with yet another preferred aspect of the invention there is provided a low pH skin care cosmetic composition wherein the said high molecular weight fatty acid(s) ingredient is selected from the group of C12-C22 fatty acids, preferably C14-] C22 fatty acids, such as stearic acid or palmitic acid either as a single high molecular : weight fatty acid or even more preferably as a mixture of high molecular weight fatty acids such as a mixture of stearic acid and palmitic acid and is present preferably in amounts of at least 6 % to about 22%, preferably 8% to 22%, more preferably 10% to 18%, by weight of the composition. In another aspect of the invention the above said composition involving the said skin benefiting Ingredient comprises at least one hydroxy acid such as preferably alpha and/ or beta hydroxy acid or any other desirable acidic skin benefit agents such as salicylic acid. In accordance with another aspect of the invention the abovesaid composition wherein the said hydroxy acid skin benefiting agent comprising at least one hydroxy acid in the range of about 0.1 to about 20% by weight, selected from the group of glycolic acid, lactic acid, 2-hydroxyoctanoic acid, salicylic acid and the like or combinations thereof preferably from about 0.5% to about 15 % by weight. In yet another preferred aspect of the Invention the amido amine in the said composition is selected from the group not limited to stearamidopropyl dimethylamine, iauramidopropyl dimethylamine, cocoamidopropyl dimethyl amine, palmitamidopropyl dimethyl amine, myristamidoethyl dimethylamine i behenamidopropyl dimethylamine, Dilinoleamidopropyl Dimethylamine, Isostearamidopropyl Dimethylamine, Oleamidopropyl Dimetliylamine, Ricinoleamidopropyl Dimetliylamine, Sunflowerseedamidopropyl Dimethylamine, Wheat Germamidopropyl Dimethylamine, Soyamidopropyl Dimethylamine, Tallamidopropyl Dimethylamine, Stearamidopropyl Morpholine, Isostearamidopropyl Morpholine and preferably behenamidopropyl dimethyl amine. Advantageously, the pH of the said composition ranges from 3 to 6.0 and more preferably ranges from 4 to 5.7. More advantageously, the skin benefiting agent In the above said composition includes skin lightening Ingredients, moisturizing ingredients, anti-aging ingredients, sunscreens, anti acne ingredients, sebum regulating ingredients and other such ingredients as needed and combinations thereof. : In another aspect of the invention there is provided a process for the preparation of the said low pH skin care composition with improved sensory properties as that of vanishing cream of pH preferably below 6 comprising (I) providing a separate mix of oil soluble ingredients including emollients, high molecular weight fatty acids, sunscreens, preservatives, antioxidants, waxes and any other oil soluble / dispersible ingredients and heating the mixture to TCC to SO^C preferably up to 78°C; (II) providing separate mix of the water soluble/dispersible Ingredients along with an emulsifier system comprising cationic salt of amido amine and optionally nonionic emulsifier heating the mixture to 70to 80°C preferably up to 75'C; (III) preparing the emulsion at 700 to SCC preferably at about 75 °C by mixing the mix of step I into mix of step II with thorough mixing followed by homogenization; (IV) cooling the mixer to below 55 to add skin benefit agents with or without other optional ingredients including perfume. In yet another aspect of the invention there is provided a process for the preparation of the low pH skin care composition wherein the said emulsifier system comprising cationic salt of amido amine is obtained comprises the steps of a) taking amido amine (s)in water phase and neutralizing the said amido amine(s) in-situ at 70'C to sec with at least one low molecular weight inorganic or organic acidic neutralizer to form the respective cationic salt and b) optionally adding at least one non-ionic emulsifier (s) at the same temperature and obtaining tlie said emulsifier system thereof. DETAILED DESCRIPTION OF THE INVENTION For the purpose of better appreciation of the invention reference is made to various terms as detailed hereunder: As used herein, the term "cosmetic composition" is intended to describe compositions for topical application to sl Except where otherwise explicitly indicated, all numbers in this description indicating amounts of materials or conditions of reaction, physical properties of materials ; and/or use are to be understood as modified by the word "about". All amounts are by weight of the compositions, unless otherwise specified. The term "skin" as used herein Includes the skin on the face, neck, chest, back, arms, hands, legs and scalp. Preferred cosmetic compositions are those suitable for the application to skin, which optionally, but preferably, include a skin benefiting agent. As discussed herein before, the present Invention is directed to provide for a stable lower irritancy skin care cosmetic compositions having skin friendly pH of below 6.0 involving skin compatible emulsifiers. An emulsifier system accomplished by way of the present invention have effectively overcome the stated prior art problems in rendering such a stable, low pH, low Irritancy, vanishing cream like skin care cosmetic composition insplte of high level incorporation of high molecular weight fatty acid Ingredients with vanishing attributes and acidic skin benefiting actives. Thus according to an important aspect of the invention, the same provides for an emulsifier system comprising salt of cationic amido amine selected from amido amine group R -C(0)-NH(CH2)n - R wherein R = C7 - C23 Aliphatic hydrocarbon radical, R = dialkyiamino or a heterocyclic amino group and n = 2, 3 preferably C16-C22 alkyl amidopropyl dimethyl amine and optionally one or more non-ionic emulsifier for incorporations of highier ieveis of liigli moiecuiar weiglit fatty acid ingredients in sl In accordance with another aspect of the invention there is provided a process for the preparation of the skin care composition with improved sensory properties as that of vanishing cream of pH preferably below 6 comprising (I) providing a separate mix of oil soluble ingredients including emollients, sunscreens, preservatives, antioxidants, high molecular weight fatty acids, waxes and any other oil soluble dispersible ingredients and heating the mixture up to 78(II) providing a separate mix of water soluble/ dispersible ingredients along with an an emulsifier system in water phase comprising a) taking amido amine (s) and neutralizing the said amido amine(s) in-situ at 70°C to 80»C with at least one low molecular weight inorganic or organic acidic neutralizer to form the respective cationic salt and b) optionally adding at least one non-ionic emulsifier (s) at the same temperature and obtaining the said emulsifier system and then incorporate other water soluble/ dispersible ingredients such as moisturizer, chelating agents, fillers or inorganic pigments, (III) preparing the emulsion between 70 to 80 , preferably about 70 to 75 by mixing the mix of step I into mix of step II under high speed mixing followed by homogenization; (IV) cooling the mixture to preferably below to add alpha /beta hydroxyl acids and /or other sicin benefiting agents followed by addition of perfume at 40 and obtaining the said vanishing cream composition thereof. The said sidn care composition of the invention thus incorporates the below mentioned skin care ingredients discussed hereunder: Amido amine: Human skin has a normal pH generally in range of 4.0- 6.0. Any soap based health and beauty cream tend to raise sicin plH above its normal range. The skin acts as a general buffer zone protecting against outside agents and a change in plH may hamper or limit the ability of the skin to provide its protective functions. Cationic ; emulsifier exhibit acidic pH values and are suitable for preserving the natural pH of I the human skin. The pH of the system has high influence on the properties of the cationic emulsifiers and at low plH values; cations are more strongly adsorbed than at higher pH value. When an emulsifier containing the hydrophobic long chain group has a positive charge then the compounds are Icnown as cationic emulsifier. Cationic emulsifiers when used as primary emulsifiers add to the versatility of secondary emulsifiers in complex formulations. Even at low levels, consumers notice the sensory profile of cationic moieties. Cationic surface active chemicals are able to aid the adsorption of the active ingredients from the emulsified products because of their surface adsorption. Unique properties of the cationic emulsifiers enables the development of highly lipophilic system that offer enhanced consumer benefits like smooth powdery skin feel which non ionic and anionic emulsifiers do not. Development of formulations with cationic emulsifiers is straightforward and similar to the techniques employed with the traditional non-ionic emulsifiers. They can either be added to the water or oil phase. Similar to other hydrophilic 0/W emulsifiers, additional stabilization of the formulations is achieved by incorporating consistency enhancers such as stearyl alcohol, cetyl alcohol or glyceryl stearate. The skin care composition of the present invention includes at least one or more of salt of amido amine made in situ by reacting amido amines represented by the general formula hereunder with low molecular weight inorganic or organic acids R - C(0) - NH (CH2)n - R Wherein R^ = C7 - C23 Aliphatic Hydrocarbon Radical R^ = Dialkylamino or Heterocyclic amino group n = 2, 3 The component of the amido amine employed in the said skin care composition is of the general formula R* - C(0) - NH(CH2)n - R* - Examples of suitable amido amines include but are not limited to stearamidopropyl dimethylamine, lauramidopropyl dimethylamine, cocoamidopropyl dimethyl amine, palmitamidopropyl dimethyl amine, myristamidoethyl dimethylamine, ibehenamidopropyl dimethylamine, stearamidopropyl diethyl amine, Dilinoleamidopropyl Dimethylamine, Isostearamidopropyl Dimethylamine, Oleamidopropyl Dimethylamine, Ricinoleamidopropyl Dimethylamine, Sunfiowerseedamidopropyl Dimethylamine, Wheat Germamidopropyl Dimethylamine, Soyamidopropyl Dimethylamine, Tallamidopropyl Dimethylamine, Stearamidopropyl Morpholine, Isostearamidopropyl l^orpholine and the like. (The foregoing list names : the compounds based upon the alkanoic acid from which the amide is derived, e.g., stearamido is derived from the reaction of stearic acid and an organic amine) Preferred amines are allcyl amidopropyl dimethyl amines, which are commercially available under the trade names Mackine 301, Incromine SB, Lexamine S13, Tegamine S13, Mackine 501V, Mackine 1001, Mackine 1201, Mackine 601, Schercodine™ S etc. with Behenamidopropyl dimethyl amine {N-[3-(Dimethylamino) Propyl] docosanamide} being the most preferred one . The proportion of said higher alkyiamldo lower alkyl di-lower alkyl amine in the final composition is about 0.1% to 2%, preferably 0.50% to 1.5%, by weight. Low molecular weight acidic neutraliser: I The skin care composition of the present invention further includes the said R* C(0)-NH(CH2)n - R wherein R = C7 - C23 Aliphatic hydrocarbon radical, R = diaikyiamino or a heterocyclic amino group and n = 2, 3 alkyl amine compound in the form of an acid salt. Such salt is formed when the amine base is neutralized with a low molecular weight aliphatic and aromatic organic acid or inorganic acid and preferably selected from acids having groups such as -OH, -CI, -NH2, ~C=C- and having molecular wt. ranging from 36.4 to 200 to form the acidic cationic salt. Acids suitable for neutralizing the amine include citric acid, lactic acid, tartaric acid, glycolic acid, malic acid, maleic acid, amino acids, gluconic acid, salicylic Acid, acetic acid, propionic acid, hydrochloric acid ,phosphoric acid and lactic and glycolic acids, ; being preferred acids. The amount of acid used should be sufficient to obtain a composition having pH in the range of 3-6 and preferably is between 4.0 to 5.7. Amounts of low molecular weight acidic neutraliser in the composition thus are in the range of about 0.001 to about 2% by weight, preferably about 0.05% to about 0.75 %. Non-Ionic Emulslfiers: The skin care composition of the present invention optionally includes one or more of non-ionic emulsifiers selected from the group of said non-ionic emulslfiers such as iethoxylated alkyl ether, sorbitan esters, ethoxylated sorbitan esters, ethoxyiated fatty acid esters, fatty alcohol, ethoxylated fatty alcohols, esters of glycerin and fatty acids sugrose ester and alkyl polyglucoside. Non-ionic emulsifiers are preferably solid and more preferably Is a mixture of mono fatty alkyl group containing 8 to 22 carbon atoms that may or may not contain sugar moiety. Further examples of non-ionic emulsifiers include the following: The head moiety of sugar-based non-Ionic emulsifiers contain a number of free hydroxy groups, which bind water and provides for additional skin moisturisation, having an impact on the stratum corneum pliability and on the penetration potential of the actives leading to a significantly better skin hydration and barrier improving potential of creams based on an alkylpolyglucoside emulsifier (Cetearyl glucoside & Cetearyl alcohol) compared to commonly used PEG emulsifiers [Savic, S., Tamburic, S., Savic, i^., Cekic, N., Milic, J., Vuleta, G., Vehicle-controlled effects of urea on normal and SLS-irritated skin, Int. J. Pharm. 271 (2004) 269-280.] In addition to their skin mildness, the abovesaid emulsifiers are known as promoters of liquid crystal mesophases, which provides additional stabilization of the system and the formation of specific colloidal structure with high percentage of interlamelarlly fixed or "depot" water [Savic, S., Vuleta, G., Daniels, R., -Goymann, CC, Colloid Polymer Sci. 283 (2005) 439-451]. Sugar based non-ionic emulsifiers included in the skin care composition of the present invention includes the commercially available form from SEPPIC Inc. under the trade name MONTANOV L(C14-22 Alcohol/C12-20 Alkyl glucoside), MONTANOV S(Cocoglucoside/Coconut alcohol), MONTANOV WO 18 (Isostearyl alcohol/Isostearyl glucoside), 14 (Myristyl alcohol/Myristyl glucoside), MONTANOV 68 (Cetearyl alcohol/Cetearyl glucoside), MONTANOV 82 (Cetearyl alcohol/Cocoglucoside), MONTANOV 202 (Arachidyl alcohol/Behenyl alcohol/Arachidyl glucoside). Sugar emulsifiers are also available commercially from Croda under the trade name of Crodesta F-10(Sucrose distearate), Crodaderm B (Sucrose Polybehenate), Crodaderm S(Sucrose Polysoyate),Crodesta F-160(Sucrose stearate), Crodesta F-110(Sucrose stearate (and)Sucrose distearate. Sugar emulsifiers are further available commercially from Cognis under the trade name Emuigade Sucro (Sucrose polystearate), Emuigade PL 68/50. Other sugar emulsifiers known in the art are Sucrose dilaurate. Sucrose Hexaerucate, Sucrose hexaoleate/ hexapalmitate/ IHexastearate, Sucrose IHexa palmitate, Sucroselaurate, Sucrose Myristate, Sucrose Octaacetate, Sucrose Oleate, Sucrose palmitate. Sucrose Pentaerucate, Sucrose Polylaurate, Sucrose polylinoleate, Sucrosepolypalmitate, Sucrose Ricinoleate, Sucrose Tetraisostearate, Sucrose Tetrastearate Triacetate, Sucrose TriBehenate, Sucrose Tristearate and the like. Amounts of non-ionic emulslfler in the composition of the present invention are in the range of about 0.01 to about 10% by weight, preferably about 0.5% to about 5%, more preferably about 0.75 % to 2.5%. High molecular weight fatty acid: The pH of the composition of this invention is less than 6.0, Preferably pH ranges between 3 to 6 and most preferably from about 4 to 5.7. High molecular weight i acidic ingredients are more specifically fatty acids. Fatty acids having 12 to 22 ; carbon atoms may also be included in the compositions of this invention. Fatty acids are obtained by hydrolysis of vegetable oils and animal fats. In their pure state they are solid, crystalline, opaque white material. Stearic acid provides an oil phase of the : emulsion which melts above body temperature and crystallizes in a suitable form so as to be invisible in use and give a dry, draggy, non-greasy; non-shiny film and also ; matte finish feel to skin; spread easily on the skin; absorb or "vanish" rapidly into the skin. The preferred high molecular weight acidic ingredients are selected from C12-C22 and preferably C14-C22 fatty acids and are preferably stearic acid or palmitic acid. The term 'Stearic acid' pertains to the crystalline mixture of palmatic acid and stearic acid. This invention covers all ratio of stearic-palmitic mixture. More preferably the ratio being Palmitic to stearic of about 55:45 on a weight % basis since they are commercially available and most inexpensive and provide an aesthetically acceptable carrier. Amounts of high molecular weight acidic Ingredients in the composition of the present invention are in the range of at least 6%, preferably 8% to 25%, more preferably 10% to 18 % to attain vanishing cream like sensory properties. Acidic Skin Benefiting Agents: The skin care composition of the present invention includes an acidic skin benefiting agent. Acidic skin benefit agents are considered as active ingredients for improving the skin structure, smoothness, firmness and moisture content. The preferred acidic skin benefit agents are hydroxy acids, most preferably alpha and beta hydroxy acids. Illustration of alpha hydroxy acid group of materials are: 2-hydroxyethanolc acid (glycolic acid); 2-hydroxypropanolc acid (lactic acid); 2-methyi 2- hydroxypropanolc acid (methyllactic add); 2-hydroxybutanolc add; 2-hydroxypentanolc add; 2-hydroxyhexanoic acid; 2-hydroxyheptanoic acid; 2-hydroxyoctanoic acid; 2-hydroxynonanoic acid; 2-hydroxydecanoic acid; 2- hydroxyundecanolc acid; 2-hydroxydodecanoic acid (alpha- hydroxylauric acid); 2-hydroxytetradecanolc acid (alpha- hydroxy my ristic add); 2-hydroxyhexadecanoic acid (alpha- hydroxypaimitic acid); 2-hydroxyoctadecanoic acid (alpha- hydroxystearic acid); 2-hydroxyeicosanolc acid (alpha- hydroxyarachidonic acid); 2-phenyl 2-hydroxyethanoic acid (mandelic add); 2,2-diphenyl 2-hydroxyethanoic acid (benzilic add); 3-phenyl 2-hydroxypropanoic acid (phenyl lactic acid); 2-phenyl, 2-methyl, 2-hydroxyethanoic add (atrolactic acid); 2- (4'-hydroxyphenyl) 2-hydroxyethanoic acid; 2- (4'-chlorophenyl 2-hydroxyethanolc acid; 2- (3'- hydroxy-4'-methoxyphenyl) 2-hydroxyethanoic add; 2- (4'- hydroxy-3'-methoxyphenyl) 2-hydroxyethanolc add; 3'- (2- hydroxyphenyl) 2-hydroxypropanolc acid; 3- (4'-hydroxyphenyl) 2-hydroxypropanoic acid; and 2- (3', 4'-dihydroxyphenyl) 2- hydroxyethanoic acid. I^ost preferred alpha hydroxy acid in the skin care compositions of the present invention are glycolic acid, lactic acid, 2-hydroxyoctanolc acid or combinations thereof. Illustration of beta-hydroxy carboxylic add is salicylic acid. The skin care composition of the present invention comprises a mixture of both a beta-hydroxy carboxylic acid and an aipha-hydroxy carboxylic acid. In a particularly preferred aspect of the invention the acidic skin benefiting Ingredients comprises a mixture of both a beta-hydroxy acid and an alpha-hydroxy acid. For instance, the optimum combination is a mixture of salicylic acid and lactic acid in a relative weight ratio from about 20: 1 to about 1: 20, preferably from about 10: 1 to 1 : 1, optimally from about 3: 1 to about 2: 1. Amounts of acidic skin benefit agents such as alpha & beta hydroxy acids In the skin care composition of the Invention are in the range of about 0.1 to about 20% by weight, preferably about 0.50% to about 15 %.other Optional Skin Benefiting Materials and Cosmetic Adjuncts: Other suitable skin benefiting agents in the skin care composition of the present invention may include but are not limited to anti-aging, wrinkle-reducing, skin whitening, anti-acne, wound healing, moisturizing, sebum reducing agents, hair growth regulating agents, vitamins, Proteins and minerals, UV diffusing/protection agents. Examples of these include kojic acid and esters, ferulic acid and ferulate derivatives, vanillic acid and esters, dioic acids (such as sebacic and azelaic acids) and esters, retinol, retinal, retinyl esters, hydroquinone, t-butyl hydroquinone, calcium alginate, hyaluronic acid, vitamin E acetate, ascorbic acid and its derivatives, mulberry extract, licorice extract, Hydrolysed Soy protein,Hydrolysed milk protein ,Allantoin, panthanol and phenolic acid, glycosidic polyhydroxybenzylate derivatives and inorganic and organic sun protecting agents. Fatty alcohols are generally selected from those with a carbon chain length C8-C22. It is preferred that the fatty alcohol is a saturated fatty alcohol. It is also particularly preferred that at least 50% of the total fatty alcohols, by weight of fatty alcohol, are solid at a temperature of at least SS'C. The total concentration of the fatty alcohol is in the range from 0.1 to 3% by weight of the cosmetic composition and more preferably from 0.25 to 1.5% Emollient materials in the form of, silicone oils and synthetic esters may or may not be incorporated into compositions of the present invention. Amounts of the emollients may range anywhere from about 0,1 to about 30%, preferably between about 0.5 to 20% by weight. Silicone oils may be divided into the volatile and non-volatile variety. The term "volatile" as used herein refers to those materials which have a measurable vapor pressure at ambient temperature. Volatile silicone oils are preferably chosen from cyclic or linear polydimethylsiloxanes containing from about 3 to about 9, preferably from about 4 to about 6, silicon atoms. Linear volatile silicone materials generally have viscosities less than about 5 centistokes at 25 while cyclic materials typically have viscosities of less than about 10 centistokes. Nonvolatile silicone oils useful as an emollient material Include polyalkyi slloxanes, polyail Suitable ester emollients include: (1) alkenyl esters of fatty acids having 10 to 20 carbon atoms, such as methyl myristate, methyl stearate, oleyl myrlstate, oleyl stearate, Octy Palmitate or butyl oleate; (2) ether-esters such as fatty acid esters of ; ethoxylated fatty alcohols; (3) polyhydric alcohol esters, such as ethylene glycol mono and di-fatty acid esters, diethylene glycol mono-and di-fatty acid esters, polyethylene glycol (200-6000) mono- and dl-fatty acid esters, propylene glycol mono-and di- fatty acid esters, polypropylene glycol 2000 monooleate, polypropylene glycol 2000 monostearate, ethoxylated propylene glycol i monostearate, glyceryl mono-and di-fatty acid esters, polyglyceroi poly-fatty esters, ethoxylated glyceryl monostearate, 1,3-butyiene glycol monostearate, 1,3-butyiene glycol distearate, poiyoxyethylene polyol fatty acid ester, sorbitan fatty acid esters, C12-15 Aikylbenzoate and poiyoxyethylene sorbitan fatty acid esters; (4) wax esters such as beeswax, spermaceti, myristyl myristate, stearyl stearate; (5) sterols esters, such as cholesterol fatty acid esters. The preferred ester emollients are isopropyl myristate,isopropyl paimitate,isostearyl palmitate, tridecyl salicylate,C12-15 octanoate, C12-15 Alkyl Banzoate and isopropyl stearate or any mixtures thereof. ;The inventive compositions most preferably further include an Ingredient selected from the group consisting of antioxidants, reducing agents, chelating agents, and mixtures thereof to improve the stability of the cosmetic cream. These ingredients ; provide an additional level of protection against oxidation of skin benefit agents In the cosmetic cream. Common examples of antioxidants, reducing agents and chelating agent for the present formulations can be found In the CTFA International Cosmetic Ingredient Dictionary 4 '^ Edition, The Cosmetic, Toiletry, and Fragrance Association, Inc., Washington, D.C., 1991. Preferable antioxidants are 6-hydroxy-2, 5, 7, 8-tetra-methylchromane-2-carboxylic iacid (trolox), propyl gallate, n-propyl tri hydroxy be nzoate, t-butyl hydroquinone and butylated hydroxytoluene (BHT), butylated hydroxyanisole (BHA), tocopheryl acetate, ascorbyl palmitate, hydroquinone, dibutyl hydroquinone and the like. Suitable examples of chelating agents include, EDTA, citric acid, tartaric acid, organo- aminophosphonic acids and organo phosphonic acid components including certain of the commercially available Dequest TM compounds, marketed by Monsanto. Preferred is EDTA-disodium. Antioxidants are further included in the skin care composition of the present invention in an amount of from 0.01 to 10%, preferably from 0.1 to 5%, most preferably from 0.2 to 4%. Reducing agents are included in the inventive ; compositions in an amount of from 0.01 to 10%, preferably from 0.1 to 5%, most ; preferably from 0.2 to 4%. Chelating agents are included in the inventive compositions in an amount of from 0.01 to 1%, preferably from 0.05 to 0.5%, most preferably from 0.05 to 0.3%. Humectants of the polyhydric alcohol-type may also be employed as cosmetically acceptable carriers In compositions of this invention. The amount of humectant may range anywhere from 0.5 to 30%, preferably between 1 and 15% by weight of the composition. The skin care composition of the invention preferably includes an effective amount of : a sunscreen and/or sun-biock agent to enhance synergistically the benefit of the composition for better sun protection. Organic and inorganic sunscreens/sun-blocks i or combinations thereof may be suitably employed in the composition. I Ultraviolet light Is a predominant cause of skin darkening. Thus, compositions comprising UVA and/or UVB sunscreen are desirable. A wide variety of conventional sunscreen agents suitable for use in combination with the skin lightening composition of the present Invention wherein such suitable I sunscreen agents include, p-aminobenzoic acid, its salts and its derivatives (ethyl, isobutyl, glyceryl esters; p-dlmethylaminobenzoic acid); anthranilates (i.e.,o-aminobenzoates; methyl, menthyl, phenyl, benzyl, phenylethyl, linalyl, terplnyl, and cyclohexenyl esters); salicylates (amyl, phenyl, benzyl, menthyl, glyceryl, and dipropyleneglycol esters); cinnamic acid derivatives (menthyl and benzyl esters, a-phenyl cinnamonitrile; butyl cinnamoyi pyruvate); dihydroxycinnamic acid derivatives (umbelliferone, methylumbelliferone, methyiaceto-umbelliferone); trihydroxycinnamic acid derivatives (esculetin, methylesculetin, daphnetin, and the glucosides, esculin and daphnin); hydrocarbons (diphenylbutadiene, stilbene); dibenzaiacetone and benzalacetophenone; naphthol-sulfonates (sodium salts of 2-naphthol-3,6-disulfonic and of 2-naphthol-6,8-disulfonic acids); di-hydroxy-naphthoic acid and its salts; o-and p- hydroxybiphenyldisulfonates; coumarin derivatives (7-hydroxy, 7-methyl, 3-phenyl); diazoles (2-acetyl-3- bromoindazole, phenyl benzoxazole, methyl naphthoxazole, various aryl benzothiazoles); quinine salts (bisulfate, sulfate, chloride, oleate, and tannate); quinoline derivatives (8-hydroxyquinoline salts, 2-phenylquinollne); hydroxy-or methoxy-substituted benzophenones; uric and vilouric acids; tannic acid and its derivatives (e. g., hexaethylether); (butyl carbotol) (6-propyl piperonyl) ether; hydroquinone; benzophenones (oxy-benzene, sulisobenzone, dioxybenzone, benzoresorcinol, 2, 2', 4, 4'-tetrahydroxybenzophenone, 2, 2'-dihydroxy-4, 4'- dimethylbenzophenone, octabenzone); 4-isopropyldibenzoylmethane; butyl-methoxydibenzoylmethane; etocrylene; and 4-isopropyl-di-benzoylmethane. Of these, 2-ethylhexyl-p-methoxycinnamate, 4, 4'-t- butylmethoxydibenzoyl-methane, 2-hydroxy-4- methoxybenzophenone, octyldimethyl-p-aminobenzoic acid, digalloyltrioleate, 2, 2-dihydroxy-4- methoxybenzophenone, ethyl-4- (bis (hydroxypropyl) ) aminobenzoate, 2-ethylhexyl-2- cyano-3,3-diphenylacrylate, 2-ethylhexylsalicylate, glyceryl-p-aminobenzoate, 3,3, 5- trimethylcyclohexylsalicylate,methylanthranilate, p- dimethyl-aminobenzoic acid or aminobenzoate, 2-ethylhexyl-i p- dimethyl-amino-benzoate, 2-phenylbenzimidazole-5-sulfonic acid, 2- (p-dimethylaminophenyl)-5-sulfonicbenzoxazoic acid and mixtures of these compounds, are preferred. More preferred sunscreens useful in the compositions are 2-ethylhexyl- p- I methoxycinnamate, butylmethoxydibenzoylmethane, 2-hydroxy- 4- methoxybenzophenone, octyldimethyl-p-aminobenzoic acid and mixtures thereof. A safe and effective amount of sunscreen may be used in the composition of the present invention useful in the subject invention. The composition preferably comprises from about 0.1% to about 10%, more preferably from about 0.1% to about 5%, of one or more sunscreen agent (s). Useful inorganic sunscreens or sun-blocl 20 Ultra fine titanium dioxide in either of its two forms, namely water-dispersible titanium dioxide and oil- dispersible titanium dioxide is especially suitable for the invention. Water-dispersible titanium dioxide is ultra-fine titanium dioxide, the particles of which are non-coated or which are coated with a material to impart a hydrophilic surface property to the particles. Examples of such materials include aluminium oxide and aluminium silicate. Oil-dispersible titanium dioxide is ultra fine titanium dioxide, the particles of which exhibits a hydrophobic surface property, and which, for this purpose, can be coated with metal soaps such as aluminium stearate, aluminium laurate or zinc stearate, or with organosilicone compounds. By topical application to the sl The total amount of inorganic sunscreen or sun blocl Suitable anti-irritancy agents include gluconolactone, borage seed oil, wild borage, dextran, alpha-bisabolol (extracted from chamomille), azulene (extracted from yarrow), resveratrol, petroseienic acid and combinations thereof. Each of these can be present at levels ranging from about 0.0001 to about 5%, preferably from about 0.001 to about 1%, optimally from about 0.01 to about 0.5% by weight of the composition. Anti-microbial agents may also be useful In compositions of the present invention. Typically the anti-microbial agents are selected from triclosan, tricarbanilide, tea tree oil, farnesol, farnesol acetate, hexachiorophene, C4-C20 quaternary ammonium salts such as benzalconium chloride and a variety of zinc or aluminum salts. Amounts of the anti-microbial agent may range from about 0.1 to about 5%, preferably from ; about 0.2 to about 1%, optimally about 0.3% by weight of the composition. Preservatives may also desirably be incorporated into the cosmetic compositions of this invention to protect against the growth of potentially harmful microorganisms. Suitable traditional preservatives include ail 21 other preservatives which have more recently come into use include hydantoin derivatives, propionate salts, and a variety of quaternary ammonium compounds. Cosmetic chemists are familiar with appropriate preservatives and routinely choose them to satisfy the preservative challenge test and to provide product stability. Particularly preferred preservatives are phenoxyethanol, methyl paraben, butyl paraben, propyl paraben, imidazolidinyl urea (commercially available as Germall 1157), sodium dehydroacetate and benzyl alcohol. The preservatives should be selected having regard for the use of the composition and possible incompatibilities between the preservatives and other ingredients in the emulsion. Preservatives are preferably employed in amounts ranging from about 0.01% to about 2% by weight of the composition. Herbal extracts may also be included as components of the composition and are particularly effective for controlling the level of sebum/oil. Suitable extracts include horseradish, oats, neem, beet, broccoli, tea, pumpl : Other optional ingredients may include coloring agents, opacifiers and pigments (e.g titanium dioxide,silica) and perfumes. Amounts of these materials may range anywhere from 0.001% up to 20% by weight of the composition. The invention is described hereunder in greater detail in relation to the following non-limiting exemplary illustrations as per the following examples: Example 1: Anti ageing Cream Triclosan 0.15 The above said composition is prepared in the following fashion. Oil Phase A mixture is heated to 78 "C. Water Phase B mixture Is heated to 75 "C In a separate vessel from that of Phase A. Add phase A mixture to phase B mixture with high speed mixing followed by homogenizatlon for 15 minutes and start cooling. Cool the mixture to 40 °C and then add the remaining ingredients. Cool the mixture to room temperature and then pack. The above said composition is prepared in the following fashion. Oil Phase A mixture is heated to 78. Water Phase B mixture is heated to 75 In a separate vessel from that of Phase A. Add phase A mixture to phase B mixture with high speed mixing followed by homogenization for 15 minutes and start cooling. Cool the mixture to 40 and then add the remaining ingredients. Cool the mixture to room temperature and then pack. Example 3: Moisturising Lotion Phase Ingredient Name Quantity in g/100 g Triclosan 0.15 The above said composition is prepared in the following fashion. Oil Phase A mixture is heated to yS'C. Water Phase B mixture is heated to 75 "C in a separate vessel from that of Phase A. Add phase A mixture to phase B mixture with high speed mixing followed by homogenization for 15 minutes and start cooling. Cool the mixture to 40 "C and then add the remaining ingredients. Cool the mixture to room temperature and then pack. The above said composition is prepared in the following fashion. Oil Phase A mixture is heated to 78 °C. Water Phase B mixture is heated to 75 "C in a separate vessel from that of Phase A. Add phase A mixture to phase B mixture with high speed mixing followed by homogenization for 15 minutes and start cooling. Cool the mixture to 50 °C and then add the Phase C mixture. Cool the mixture to 40 "C temperature and then add phase D mixture. Cool the mixture to room temperature and then pack. A series of tests were conducted and established the stability of the preferred above stated composition containing cationic & non-ionic emulsifiers as stabilizing agents for low pH vanishing creams wherein the pH of products was found to be Thus the present invention provides for a stable lower irritancy skin care cosmetic compositions having skin compatible pH preferably in the range of 3.0-6.0 involving skin compatible emulsifiers. The said low pH skin care cosmetic composition comprising of an emulsifier system involving cationic salts of amido amine and optionally a non-ionic emulsifier applicable in vanishing cream formulations facilitated in attaining a stable, low pH, low irritancy, vanishing cream like skin care cosmetic composition inspite of high level incorporation of high molecular weight fatty acid ingredients and acidic skin care agents in the said skin composition for vanishing attributes of the said composition. Importantly, therefore the cosmetic skin care composition of the present invention facilitates better incorporation of skin benefiting agents and cosmetic adjuncts without compromising on the desired stability, pH range and the vanishing cream like attributes of the skin care composition. WE CLAIM: 1. A low pH (pH = 3.0- 6.0) skin care cosmetic composition comprising of (a) an emulsifier system obtained from one or more cationic salts of amido amines and optionally one or more non-ionic emulsifier, (b) at least one high molecular weight fatty acid in amount of 6-22% by weight of the composition and (c) a cosmetically acceptable vehicle with or without other skin benefiting agents including acidic skin care agents. 2. A low plH skin care cosmetic composition as claimed in Claim 1 comprising of: b) an emulsifier system comprising one or more cationic salts of amido amines in the range of 0.1% to about 2% by wt. of the composition, and optionally one or more non-ionic emulsifier in the range of from 0.01% to 10% by wt. of the composition; b) at least one high molecular weight fatty acid ingredient in at least 6 % by weight of the composition; and c) a cosmetically acceptable vehicle with or without other skin benefiting agents including acidic skin care agents. 3. A low pH skin care cosmetic composition as claimed in claim 2 wherein the said emulsifier system comprising of cationic amido amine salts Is obtained from (a) amido amine (s) in the range of 0.1% to 2%, preferably 0.5% to 1.5% by weight of the said composition and preferably selected from amido amine of the formula R^ -C(0)-NH(CH2)n - R^ wherein R^ = C7 - C23 Aliphatic hydrocarbon radical, R^ = dialkylamino or a heterocyclic amino group and n = 2, 3 more preferably C16-C22 alky! amidopropyl dimethyl amine and (b) low molecular weight inorganic or organic acidic neutralizer (s) in the range of 0.01% to about 2%, preferably 0.05% to 0.75% by weight of the said composition and preferably selected from acids having groups such as -OH, -CI, -NHz, -C=C-, aliphatic, aromatic and exemplified by acids such as glycoiic acid, lactic acid, 2-hydroxy octanoic acid, salicylic acid, citric acid, malic acid, maleic acid, hydrochloric acid, acetic acid, propionic acid, amino acids, benzoic acid and the like and combinations thereof. 4. A low pH skin care cosmetic composition as claimed in claim 2 wherein the said optional non-ionic emulsifier is in the range of from 0.01% to 10% by wt. of the composition preferably selected form the group of sucrose esters and alkyl 27 glucosides and is present preferably in about 0.5% to about 5%, more preferably about 0.75 % to 2.5% by wt. of the composition 5. A low pH skin care cosmetic composition as claimed in claim 2 wherein the said high molecular weight fatty acid(s) ingredient is selected from the group of C12-C22 fatty acids, preferably C14-C22 fatty acids, such as stearic acid or palmitic acid either as a single high molecular weight fatty acid or even more preferably as a mixture of high molecular weight fatty acids such as a mixture of stearic acid and palmitic acid and is present preferably in amounts of at least 6 % to about 22%, preferably 8% to 22%, more preferably 10% to 18%, by weight of the composition. 6. The composition as claimed in claim 1, wherein the skin benefiting ingredient comprises at least one hydroxy acid such as preferably alpha and/ or beta hydroxy acid or any other desirable acidic skin benefit agents such as salicylic acid 7. The composition as claimed in claim 6, wherein the said hydroxy acid skin benefiting agent comprising at least one hydroxy acid in the range of about 0.1 to about 20% by weight, selected from the group of glycolic acid, lactic acid, 2-hydroxyoctanoic acid, salicylic acid and the like or combinations thereof preferably from about 0.5% to about 15 % by weight. 8. The composition as claimed in anyone of claim 3 to 7 , wherein the amido amine is selected from the group and not limited to stearamidopropyl dimethylamine, lauramidopropyl dimethylamine, cocoamidopropyl dimethyl amine, palmitamidopropyl dimethyl amine, myristamidoethyl dimethylamine behenamidopropyl dimethylamine, Dilinoleamidopropyl Dimethylamine, Isostearamidopropyl Dimethylamine, Oleamidopropyl Dimethylamine, Ricinoleamidopropyl Dimethylamine, Sunflowerseedamidopropyl Dimethylamine, Wheat Germamidopropyi Dimethylamine, Soyamidopropyl Dimethylamine, Tallamidopropyl Dimethylamine, stearamidopropyl morpholine, Isostearamidopropyl morpholine and preferably behenamidopropyl dimethyl amine. 9. A composition as claimed in anyone of claims 1 to 8 wherein the pH ranges from 3 to 6.0 and more preferably ranges from 4 to 5.7. 28 10. A composition as claimed in anyone of claims 1 to 9 wherein tlie skin benefiting agent includes skin lightening ingredients, moisturizing ingredients, anti-aging ingredients, sunscreens, anti acne ingredients, sebum regulating ingredients and other such ingredients as needed and combinations thereof. 11. A process for the preparation of the low pH skin care composition with improved sensory properties as that of vanishing cream of pH preferably below 6 as claimed in anyone of claims 1 to 10 comprising (I) providing a separate mix of oil soluble ingredients including emollients, high molecular weight fatty acids, sunscreens, preservatives, antioxidants, waxes and any other oil soluble / dispersible ingredients and heating the mixture to 70°C to 80°C preferably up to (II) providing separate mix of the water soluble/ dispersible ingredients along with an emulsifier system comprising cationic salt of amido amine and optionally nonionic emulsifier heating the mixture to to preferably up to ys (III) preparing the emulsion at preferably at about 75 by mixing the mix of step I into mix of step II with thorough mixing followed by homogenization; (IV) cooling the mixer to below 55 to add skin benefit agents with or without other optional ingredients including perfume. 12. A process for the preparation of the low pH skin care composition as claimed in claim 11 wherein the said emulsifier system comprising cationic salt of amido amine is obtained comprises the steps of a) taking amido amine (s)in water phase and neutralizing the said amido amine(s) In-situ at 70°C to 80*»C with at least one low molecular weight inorganic or organic acidic neutralizer to form the respective cationic salt and b) optionally adding at least one non-Ionic emulsifier (s) at the same temperature and obtaining the said emulsifier system thereof. 13. The skin care composition with vanishing attributes Involving the said emulsifier system, the high molecular weight fatty acid and the process to reach to the said skin care composition substantially as herein described and illustrated in relation to the accompanying examples.

Full Text

FIELD OF THE INVENTION
The present invention relates to a skin care composition, and more specifically, relates to a stable low pH cosmetic skin care composition comprising of cationic salt of amido amine, high molecular weight fatty acid and optionally involving non-ionic emulsifiers with improved sensory properties such as the sensory properties of vanishing creams and the like. most advantageously, the Incorporation of the higher molecular weight fatty acids and cationic salts of amido amine favours in attaining the desired sensory profile of the said skin care composition of the present invention and beneficially aid In incorporating higher levels of skin benefiting actives including acidic skin care actives in association with cosmetically acceptable vehicle in skin care formulations and yet be stable.
BACKGROUND ART
There is an increasing demand nowadays for skin compatible cosmetic preparations with lower irritancy and sensorial properties equivalent to vanishing cream. The traditionally used vanishing cream is dominated with high levels of fatty acid and alkali metal soap as an emulsifier which is important for physical stability of the product. However the presence of soap Increases the pH value of the product and the cosmetic composition becomes alkaline. Such a product is stable only under alkaline condition.
The surfaces of human skin are normally having pH of 4.0- 6.0, Upon contact with an alkaline substance, the skin secretes acidic substances to restore the normal pH lvalue. This process results in disturbance to the skin physiology and causes secretions such as sebum, sweat etc. resulting in skin irritation. Accordingly, it is desired that cosmetics such as creams, lotions etc. when applied to the skin are conditioned to be weakly acidic or to be of neutral pH while maintaining the characteristics of the traditional vanishing cream. On incorporation of acidic skin benefiting agent such as the alpha and beta hydroxy acids, the said anionic fatty soap emulsifier gets dissociated to its corresponding fatty acid and alkali metal salt of acidic skin benefiting agents. This in turn results in drop in pH and thereby causes physical instability. The lack of physical stability of the fatty acid soap emulsified vanishing creams at low pH is a disadvantage that restricts the use of valuable acidic beneficial actives, such as alpha-beta hydroxy carboxylic acids, because the said beneficial acidic actives dissociate tlie fatty acid soap emulsifier and adds to the Instability of the composition.
A wide variety of acidic skin benefiting compounds such as hydroxy acids are used In i the formulations of vanishing cream, stabilized with anionic and non Ionic emulsifier.
US Patent 6979452 B2 (Yan Zhou, et al) discloses low pH, high skin friction cosmetic cream containing solid asymmetric particles, an anionic emulsifier and a cosmetically
I acceptable vehicle. It describes the extensive use of ethoxyiated non-ionic surfactants such as ethoxyiated aikyi ether, ethoxyiated sorbitan esters, ethoxyiated
; fatty alcohols and ethoxyiated fatty acid esters. The anionic emuisifiers are selected from sulphates, sulphonates, succinates, isothionates, sarcosinates and taurates.
I Sodium cetostearyl sulphate has been used as an exemplary anionic emulsifier in the said prior art and the acidic skin benefit agents encompasses alpha & beta hydroxy acids namely glycollc, lactic and salicylic acid. Although these compositions are described to be stable at low pH giving desired sensory properties, the irritancy level of emuisifiers have not been realized.
It is known that sulphates and sulphonates based anionic emuisifiers exhibit a high irritancy potential as also mentioned in US patent 4,536,519 by Suzuki et al., wherein an emulsified system prepared with a higher levels of alcohol sulphate has a drawback of imparting excessively high Irritations to the skin along with the instability that is imparted to such systems due to gradual hydrolysis of the said alcohol sulphate with time. Uses of Polyethylene Glycol (PEG) derived nonionic emuisifiers also increase the risk of skin irritation. The cumulative irritancy of the
I said emuisifiers present along with other skin benefiting agents are thus often
discouraged from usage in such skin care compositions and particularly discouraged for those having sensitive skin. Therefore it is a long felt need to provide for a composition pertaining to skin care that is not only stable at low pH but has desired sensory characteristics along with a reduced risk of skin Irritations due to the presence of the emuisifiers in such skin care compositions.
US patent 6,153,177 (Bartolone et al.) discloses vanishing creams which are
formulated to Include alkali or alkaline earth metal salts of alpha-hydroxy carboxylic
acids In order to achieve skin lightening properties having pH of above 5. The salts of
alpha- hydroxy carboxylic acids and not the direct acids were incorporated In the said

I prior art to avoid instability in emulsions. The said salt of the acidic skin benefiting agents thus reduces the efficacy of the acidic sl(in benefiting agents.
U.S Patent 4, 536,519 (Suzuki et al.) uses a neutralized phosphoric ester as an emulsifler, a nonionic surfactant with HLB less than six and fatty components at neutral or weakly acidic pH. These compositions lack the sensory characteristics that are due to the lack of proper emulsifler systems.
WO 01/70188 (Dwiwahyu et al.) disclose a low pH (1-6.5) non-acid soap vanishing ' cream with enhanced stability and skin benefit properties. A C8-C22 fatty acid substituted saccharide is used to stabilize the low pH stearic acid based vanishing cream. These compositions again lack the sensory characteristics due to the lack of proper emulsifler systems.
As apparent, the above discussed prior art describes the extensive use of anionic and non-ionic emulsifler to maintain the stability of the skin care compositions containing high molecular weight fatty acid to give vanishing cream like feel . Anionic emulsifler carries a negative charge; tend to raise the skin pH above its normal value 4.0 to 6.0. Anionic emulsiflers have been demonstrated to cause damage to the stratum corneum barrier wherein SLS (sodium lauryl sulphate) in being an anionic surfactant is used as positive control In skin irritancy tests.
Skin care compositions containing cationic emulsiflers are well known due to the unique sensory profile that these emulsiflers provide at lower pH. They carry positive charge and are thus advantageous in light of the negatively charged characteristic of the skin. Cationic emulsiflers provide a smooth powdery feel and allow incorporating high level of active ingredients in the composition and increased active ingredient delivery to the skin because of its cationic nature (Klus Jenny & Anna Howe, Soaps Perfumery 8i Cosmetics April 2008).
Chang et al. in US patent application 2008/0020005A1 discloses a composition containing a nonionic, cationic emulsifler combination and polar emollient system to reduce the irritancy of Alpha Hydroxy acid ( AHA) and also to enable the sustained release of AHA. The disadvantage of the composition rests with the polar emollient system selected for this composition that does not impart vanishing cream iii Epstein et al. in US Patent 5759558 is directed to a cationic emulsifier in oil-in-water emulsion incorporated in the composition that is well accepted and popular in marlcet for its excellent tactile properties of the said composition, marketed under the brand CUREL by Bausch and Lomb. The said patent also describes composition containing an AHA (Alpha Hydroxy Acid), cationic emulsifier, mineral oil and petrolatum used for moisturizing and giving conditioning benefits to the skin. The disadvantage of the composition lies in the absence of vanishing cream like characteristics due to selection of mineral oil base which gives the shiny and oily look to the skin.
Struewing in US patent 5654341 discloses a low pH skin treatment composition ; containing cationic surfactant, fatty acid and hydrocarbon component in oil-in-water ] emulsion. It further describes addition of fatty acid to the cationic surfactant to form a complex which prevents the cationic surfactant from irritating the skin, and at the same time reduces the pH of the composition but does not provide any vanishing cream like sensory characteristics due to the complete reaction of fatty acid with cationic surfactant.
It would be clearly apparent from the above existing state of the art and related discussions that although several efficacious skin care compositions are known, it is difficult to provide for compositions which could strike the baldbetween the vanishing characteristics of the said skin care composition in association to the reduced level of skin irritancy, unique sensory profile at lower pH and increased active ingredient delivery to the skin.
Thus as is evident, there is a strong need in the art to provide for a balanced cosmetic skin care composition that would Include important skin care actives such as alpha & beta hydroxy acids and in spite of such inclusion of the said actives would possess compatible pH, would further possess compatible pH in spite of the use of bther acidic ingredients, and would yet further possess required sensory properties like those of vanishing creams with low skin irritancy potential.

OBJECTS OF THE INVENTION
It is thus the basic object of the present invention to provide a iow pH skin care composition comprising catlonic salt of amido amine, high molecular weight fatty acid and optionally one or more of non-ionic emulsifier, that would enable incorporation of other skin benefiting acid ingredients in skin care cosmetic compositions to impart improved sensory properties such as the sensory properties of vanishing cream to the said skin care composition.
It is another object of the present invention to provide for a balanced skin care ; cosmetic composition with skin compatible pH even on the inclusion of high level of free fatty acids along with skin care actives such as alpha & beta hydroxy acids with required sensory properties like those of vanishing creams, and with low skin irritancy potential.
Yet another object of the present invention is directed to provide low pH skin care cosmetic composition that would facilitate the restriction of the skin pH within the beneficial range unlike the skin care compositions comprising anionic surfactants whereby the skin pH rises above its normal value due to the incorporation of such said anionic surfactants.
Yet another object of the present invention is to provide said skin care cosmetic compositions with low pH comprising catlonic salt of amido amine to thereby replace the anionic emulsifiers in the said composition along with its associated disadvantages further comprising additional high molecular weight fatty acid ingredient such as free fatty acids attributing vanishing cream like sensory properties.
It is a further object of the invention to provide such said skin care cosmetic compositions with low pH, comprising catlonic salt of amido amine, high molecular weight fatty acid ingredients further in combination with acidic skin benefiting actives such as alpha and beta hydroxy acids.
Still another object of the invention is to provide for stable skin care cosmetic compositions with low pH comprising emulsifier such as catlonic salt of amido amine which is formed insitu and optionaily one or more non-ionic emulsifier, in addition to the above said ingredients to attain the desired sensory profile of the said skin care composition that further aids in incorporating higher levels of skin benefiting actives and yet be stable with low skin irritancy.
SUMMARY OF THE INVENTION
Thus according to the basic aspect of the invention there is provided a low pH (pH = 3.0-6.0) cosmetic skin care composition comprising of (a) an emulsifier system obtained from one or more cationic salts of amldo amines and optionally one or more : non-ionic emulsifier, (b) at least one high molecular weight fatty acid in amounts of 6-22% by weight of the composition and (c) a cosmetically acceptable vehicle with or without other skin benefiting agents including acidic skin care agents.
In accordance with a preferred aspect of the invention there is provided a low pH skin care cosmetic composition comprising of:
a) an emulsifier system comprising one or more cationic salts of amido amines in
the range of 0.1% to about 2% by wt. of the composition, and optionally one or
more non-ionic emulsifier in the range of from 0.01% to 10% by wt. of the composition;
b) at least one high molecular weight fatty acid ingredient in at least 6 % by weight
of the composition; and
c) a cosmetically acceptable vehicle with or without other skin benefiting agents
including acidic skin care agents.
In accordance with another preferred aspect of the Invention there is provided a low pH cosmetic skin care composition wherein the said emulsifier system comprising of cationic amido amine salts is obtained from (a) amido amine (s) in the range of 0.1% to 2%, preferably 0.5% to 1.5% by weight of the said composition and preferably selected from amido amine of the formula R1 -C(0)-l\IH(CH2)n - R wherein R = C7 - C23 Aliphatic hydrocarbon radical, R = dialkylamino or a heterocyclic amino group and n = 2, 3 more preferably C16-C22 alkyl amidopropyl dimethyl amine and (b) low molecular weight inorganic or organic acidic neutralizer (s) in the range of 0.01% to about 2%, preferably 0.05% to 0.75% by weight of the said composition and preferably selected from acids having groups such as -OH, -CI, -NH2, "C=C-, aliphatic, aromatic and exemplified by acids such as glycolic acid.

lactic acid, 2-hydroxy octanolc acid, salicylic acid, citric acid, malic acid, maieic acid, hydrociiioric acid, amino acids, benzoic acid, acetic acid, propionic acid and the like and combinations tiiereof.
In accordance witli yet anotiier preferred aspect of the invention there is provided a low pH sicin care cosmetic composition wherein the said optional non-ionic emulsifier in the range of from 0.01% to 10% by wt. of the composition preferably selected form the group of sucrose esters and alkyl glucosides and is present preferably in i about 0.5% to about 5%, more preferably about 0.75 % to 2.5% by wt. of the composition
I In accordance with yet another preferred aspect of the invention there is provided a low pH skin care cosmetic composition wherein the said high molecular weight fatty acid(s) ingredient is selected from the group of C12-C22 fatty acids, preferably C14-] C22 fatty acids, such as stearic acid or palmitic acid either as a single high molecular : weight fatty acid or even more preferably as a mixture of high molecular weight fatty acids such as a mixture of stearic acid and palmitic acid and is present preferably in amounts of at least 6 % to about 22%, preferably 8% to 22%, more preferably 10% to 18%, by weight of the composition.
In another aspect of the invention the above said composition involving the said skin benefiting Ingredient comprises at least one hydroxy acid such as preferably alpha and/ or beta hydroxy acid or any other desirable acidic skin benefit agents such as salicylic acid.
In accordance with another aspect of the invention the abovesaid composition wherein the said hydroxy acid skin benefiting agent comprising at least one hydroxy acid in the range of about 0.1 to about 20% by weight, selected from the group of glycolic acid, lactic acid, 2-hydroxyoctanoic acid, salicylic acid and the like or combinations thereof preferably from about 0.5% to about 15 % by weight.
In yet another preferred aspect of the Invention the amido amine in the said composition is selected from the group not limited to stearamidopropyl dimethylamine, iauramidopropyl dimethylamine, cocoamidopropyl dimethyl amine, palmitamidopropyl dimethyl amine, myristamidoethyl dimethylamine

i behenamidopropyl dimethylamine, Dilinoleamidopropyl Dimethylamine,
Isostearamidopropyl Dimethylamine, Oleamidopropyl Dimetliylamine,
Ricinoleamidopropyl Dimetliylamine, Sunflowerseedamidopropyl Dimethylamine, Wheat Germamidopropyl Dimethylamine, Soyamidopropyl Dimethylamine, Tallamidopropyl Dimethylamine, Stearamidopropyl Morpholine, Isostearamidopropyl Morpholine and preferably behenamidopropyl dimethyl amine.
Advantageously, the pH of the said composition ranges from 3 to 6.0 and more preferably ranges from 4 to 5.7.
More advantageously, the skin benefiting agent In the above said composition includes skin lightening Ingredients, moisturizing ingredients, anti-aging ingredients, sunscreens, anti acne ingredients, sebum regulating ingredients and other such ingredients as needed and combinations thereof.
: In another aspect of the invention there is provided a process for the preparation of the said low pH skin care composition with improved sensory properties as that of vanishing cream of pH preferably below 6 comprising (I) providing a separate mix of oil soluble ingredients including emollients, high molecular weight fatty acids, sunscreens, preservatives, antioxidants, waxes and any other oil soluble / dispersible ingredients and heating the mixture to TCC to SO^C preferably up to 78°C; (II) providing separate mix of the water soluble/dispersible Ingredients along with an emulsifier system comprising cationic salt of amido amine and optionally nonionic emulsifier heating the mixture to 70to 80°C preferably up to 75*'C; (III) preparing the emulsion at 700 to SCC preferably at about 75 °C by mixing the mix of step I into mix of step II with thorough mixing followed by homogenization; (IV) cooling the mixer to below 55 to add skin benefit agents with or without other optional ingredients including perfume.
In yet another aspect of the invention there is provided a process for the preparation of the low pH skin care composition wherein the said emulsifier system comprising cationic salt of amido amine is obtained comprises the steps of a) taking amido amine (s)in water phase and neutralizing the said amido amine(s) in-situ at 70*'C to sec with at least one low molecular weight inorganic or organic acidic neutralizer to form the respective cationic salt and b) optionally adding at least one non-ionic

emulsifier (s) at the same temperature and obtaining tlie said emulsifier system thereof.
DETAILED DESCRIPTION OF THE INVENTION
For the purpose of better appreciation of the invention reference is made to various terms as detailed hereunder:
As used herein, the term "cosmetic composition" is intended to describe compositions for topical application to sl Except where otherwise explicitly indicated, all numbers in this description indicating amounts of materials or conditions of reaction, physical properties of materials ; and/or use are to be understood as modified by the word "about". All amounts are by weight of the compositions, unless otherwise specified.
The term "skin" as used herein Includes the skin on the face, neck, chest, back, arms, hands, legs and scalp.
Preferred cosmetic compositions are those suitable for the application to skin, which optionally, but preferably, include a skin benefiting agent.
As discussed herein before, the present Invention is directed to provide for a stable lower irritancy skin care cosmetic compositions having skin friendly pH of below 6.0 involving skin compatible emulsifiers. An emulsifier system accomplished by way of the present invention have effectively overcome the stated prior art problems in rendering such a stable, low pH, low Irritancy, vanishing cream like skin care cosmetic composition insplte of high level incorporation of high molecular weight fatty acid Ingredients with vanishing attributes and acidic skin benefiting actives.
Thus according to an important aspect of the invention, the same provides for an emulsifier system comprising salt of cationic amido amine selected from amido amine group R -C(0)-NH(CH2)n - R wherein R = C7 - C23 Aliphatic hydrocarbon radical, R = dialkyiamino or a heterocyclic amino group and n = 2, 3 preferably C16-C22 alkyl amidopropyl dimethyl amine and optionally one or more non-ionic emulsifier for incorporations of highier ieveis of liigli moiecuiar weiglit fatty acid ingredients in sl In accordance with another aspect of the invention there is provided a process for the preparation of the skin care composition with improved sensory properties as that of vanishing cream of pH preferably below 6 comprising (I) providing a separate mix of oil soluble ingredients including emollients, sunscreens, preservatives, antioxidants, high molecular weight fatty acids, waxes and any other oil soluble dispersible ingredients and heating the mixture up to 78(II) providing a separate mix of water soluble/ dispersible ingredients along with an an emulsifier system in water phase comprising a) taking amido amine (s) and neutralizing the said amido amine(s) in-situ at 70°C to 80*»C with at least one low molecular weight inorganic or organic acidic neutralizer to form the respective cationic salt and b) optionally adding at least one non-ionic emulsifier (s) at the same temperature and obtaining the said emulsifier system and then incorporate other water soluble/ dispersible ingredients such as moisturizer, chelating agents, fillers or inorganic pigments, (III) preparing the emulsion between 70 to 80 , preferably about 70 to 75 by mixing the mix of step I into mix of step II under high speed mixing followed by homogenization; (IV) cooling the mixture to preferably below to add alpha /beta hydroxyl acids and /or other sicin benefiting agents followed by addition of perfume at 40 and obtaining the said vanishing cream composition thereof.
The said sidn care composition of the invention thus incorporates the below mentioned skin care ingredients discussed hereunder:
Amido amine:
Human skin has a normal pH generally in range of 4.0- 6.0. Any soap based health and beauty cream tend to raise sicin plH above its normal range. The skin acts as a general buffer zone protecting against outside agents and a change in plH may hamper or limit the ability of the skin to provide its protective functions. Cationic ; emulsifier exhibit acidic pH values and are suitable for preserving the natural pH of I the human skin. The pH of the system has high influence on the properties of the cationic emulsifiers and at low plH values; cations are more strongly adsorbed than at higher pH value.

When an emulsifier containing the hydrophobic long chain group has a positive
charge then the compounds are Icnown as cationic emulsifier.
Cationic emulsifiers when used as primary emulsifiers add to the versatility of
secondary emulsifiers in complex formulations. Even at low levels, consumers notice
the sensory profile of cationic moieties.
Cationic surface active chemicals are able to aid the adsorption of the active
ingredients from the emulsified products because of their surface adsorption.
Unique properties of the cationic emulsifiers enables the development of highly
lipophilic system that offer enhanced consumer benefits like smooth powdery skin
feel which non ionic and anionic emulsifiers do not.
Development of formulations with cationic emulsifiers is straightforward and similar to the techniques employed with the traditional non-ionic emulsifiers. They can either be added to the water or oil phase. Similar to other hydrophilic 0/W emulsifiers, additional stabilization of the formulations is achieved by incorporating consistency enhancers such as stearyl alcohol, cetyl alcohol or glyceryl stearate.
The skin care composition of the present invention includes at least one or more of salt of amido amine made in situ by reacting amido amines represented by the general formula hereunder with low molecular weight inorganic or organic acids
R* - C(0) - NH (CH2)n - R Wherein
R^ = C7 - C23 Aliphatic Hydrocarbon Radical
R^ = Dialkylamino or Heterocyclic amino group
n = 2, 3
The component of the amido amine employed in the said skin care composition is of
the general formula R* - C(0) - NH(CH2)n - R* - Examples of suitable amido
amines include but are not limited to stearamidopropyl dimethylamine,
lauramidopropyl dimethylamine, cocoamidopropyl dimethyl amine,
palmitamidopropyl dimethyl amine, myristamidoethyl dimethylamine,
ibehenamidopropyl dimethylamine, stearamidopropyl diethyl amine,
Dilinoleamidopropyl Dimethylamine, Isostearamidopropyl Dimethylamine,
Oleamidopropyl Dimethylamine, Ricinoleamidopropyl Dimethylamine,
Sunfiowerseedamidopropyl Dimethylamine, Wheat Germamidopropyl Dimethylamine, Soyamidopropyl Dimethylamine, Tallamidopropyl Dimethylamine, Stearamidopropyl Morpholine, Isostearamidopropyl l^orpholine and the like. (The foregoing list names

: the compounds based upon the alkanoic acid from which the amide is derived, e.g., stearamido is derived from the reaction of stearic acid and an organic amine)
Preferred amines are allcyl amidopropyl dimethyl amines, which are commercially available under the trade names Mackine 301, Incromine SB, Lexamine S13, Tegamine S13, Mackine 501V, Mackine 1001, Mackine 1201, Mackine 601, Schercodine™ S etc. with Behenamidopropyl dimethyl amine {N-[3-(Dimethylamino) Propyl] docosanamide} being the most preferred one .
The proportion of said higher alkyiamldo lower alkyl di-lower alkyl amine in the final composition is about 0.1% to 2%, preferably 0.50% to 1.5%, by weight.
Low molecular weight acidic neutraliser:
I The skin care composition of the present invention further includes the said R* C(0)-NH(CH2)n - R wherein R = C7 - C23 Aliphatic hydrocarbon radical, R = diaikyiamino or a heterocyclic amino group and n = 2, 3 alkyl amine compound in the form of an acid salt. Such salt is formed when the amine base is neutralized with a low molecular weight aliphatic and aromatic organic acid or inorganic acid and preferably selected from acids having groups such as -OH, -CI, -NH2, ~C=C- and having molecular wt. ranging from 36.4 to 200 to form the acidic cationic salt. Acids suitable for neutralizing the amine include citric acid, lactic acid, tartaric acid, glycolic acid, malic acid, maleic acid, amino acids, gluconic acid, salicylic Acid, acetic acid, propionic acid, hydrochloric acid ,phosphoric acid and lactic and glycolic acids,
; being preferred acids. The amount of acid used should be sufficient to obtain a composition having pH in the range of 3-6 and preferably is between 4.0 to 5.7.
Amounts of low molecular weight acidic neutraliser in the composition thus are in the range of about 0.001 to about 2% by weight, preferably about 0.05% to about 0.75 %.
Non-Ionic Emulslfiers:
The skin care composition of the present invention optionally includes one or more of non-ionic emulsifiers selected from the group of said non-ionic emulslfiers such as iethoxylated alkyl ether, sorbitan esters, ethoxylated sorbitan esters, ethoxyiated fatty acid esters, fatty alcohol, ethoxylated fatty alcohols, esters of glycerin and fatty acids sugrose ester and alkyl polyglucoside.

Non-ionic emulsifiers are preferably solid and more preferably Is a mixture of mono fatty alkyl group containing 8 to 22 carbon atoms that may or may not contain sugar moiety.
Further examples of non-ionic emulsifiers include the following: The head moiety of sugar-based non-Ionic emulsifiers contain a number of free hydroxy groups, which bind water and provides for additional skin moisturisation, having an impact on the stratum corneum pliability and on the penetration potential of the actives leading to a significantly better skin hydration and barrier improving potential of creams based on an alkylpolyglucoside emulsifier (Cetearyl glucoside & Cetearyl alcohol) compared to commonly used PEG emulsifiers [Savic, S., Tamburic, S., Savic, i^., Cekic, N., Milic, J., Vuleta, G., Vehicle-controlled effects of urea on normal and SLS-irritated skin, Int. J. Pharm. 271 (2004) 269-280.]
In addition to their skin mildness, the abovesaid emulsifiers are known as promoters of liquid crystal mesophases, which provides additional stabilization of the system and the formation of specific colloidal structure with high percentage of interlamelarlly fixed or "depot" water [Savic, S., Vuleta, G., Daniels, R., -Goymann, CC, Colloid Polymer Sci. 283 (2005) 439-451].
Sugar based non-ionic emulsifiers included in the skin care composition of the present invention includes the commercially available form from SEPPIC Inc. under the trade name MONTANOV L(C14-22 Alcohol/C12-20 Alkyl glucoside), MONTANOV S(Cocoglucoside/Coconut alcohol), MONTANOV WO 18 (Isostearyl alcohol/Isostearyl glucoside), 14 (Myristyl alcohol/Myristyl glucoside), MONTANOV 68 (Cetearyl alcohol/Cetearyl glucoside), MONTANOV 82 (Cetearyl alcohol/Cocoglucoside), MONTANOV 202 (Arachidyl alcohol/Behenyl alcohol/Arachidyl glucoside). Sugar emulsifiers are also available commercially from Croda under the trade name of Crodesta F-10(Sucrose distearate), Crodaderm B (Sucrose Polybehenate), Crodaderm S(Sucrose Polysoyate),Crodesta F-160(Sucrose stearate), Crodesta F-110(Sucrose stearate (and)Sucrose distearate. Sugar emulsifiers are further available commercially from Cognis under the trade name Emuigade Sucro (Sucrose polystearate), Emuigade PL 68/50. Other sugar emulsifiers known in the art are Sucrose dilaurate. Sucrose Hexaerucate, Sucrose hexaoleate/ hexapalmitate/ IHexastearate, Sucrose IHexa palmitate, Sucroselaurate, Sucrose Myristate, Sucrose Octaacetate, Sucrose Oleate, Sucrose palmitate. Sucrose Pentaerucate, Sucrose Polylaurate, Sucrose polylinoleate, Sucrosepolypalmitate, Sucrose Ricinoleate,

Sucrose Tetraisostearate, Sucrose Tetrastearate Triacetate, Sucrose TriBehenate, Sucrose Tristearate and the like.
Amounts of non-ionic emulslfler in the composition of the present invention are in the range of about 0.01 to about 10% by weight, preferably about 0.5% to about 5%, more preferably about 0.75 % to 2.5%.
High molecular weight fatty acid:
The pH of the composition of this invention is less than 6.0, Preferably pH ranges
between 3 to 6 and most preferably from about 4 to 5.7. High molecular weight i acidic ingredients are more specifically fatty acids. Fatty acids having 12 to 22 ; carbon atoms may also be included in the compositions of this invention. Fatty acids
are obtained by hydrolysis of vegetable oils and animal fats. In their pure state they
are solid, crystalline, opaque white material. Stearic acid provides an oil phase of the : emulsion which melts above body temperature and crystallizes in a suitable form so
as to be invisible in use and give a dry, draggy, non-greasy; non-shiny film and also ; matte finish feel to skin; spread easily on the skin; absorb or "vanish" rapidly into
the skin.
The preferred high molecular weight acidic ingredients are selected from C12-C22
and preferably C14-C22 fatty acids and are preferably stearic acid or palmitic acid.
The term 'Stearic acid' pertains to the crystalline mixture of palmatic acid and stearic
acid.
This invention covers all ratio of stearic-palmitic mixture. More preferably the ratio being Palmitic to stearic of about 55:45 on a weight % basis since they are commercially available and most inexpensive and provide an aesthetically acceptable carrier.
Amounts of high molecular weight acidic Ingredients in the composition of the present invention are in the range of at least 6%, preferably 8% to 25%, more preferably 10% to 18 % to attain vanishing cream like sensory properties.
Acidic Skin Benefiting Agents:
The skin care composition of the present invention includes an acidic skin benefiting agent. Acidic skin benefit agents are considered as active ingredients for improving the skin structure, smoothness, firmness and moisture content.

The preferred acidic skin benefit agents are hydroxy acids, most preferably alpha and beta hydroxy acids.
Illustration of alpha hydroxy acid group of materials are: 2-hydroxyethanolc acid (glycolic acid); 2-hydroxypropanolc acid (lactic acid); 2-methyi 2- hydroxypropanolc acid (methyllactic add); 2-hydroxybutanolc add; 2-hydroxypentanolc add; 2-hydroxyhexanoic acid; 2-hydroxyheptanoic acid; 2-hydroxyoctanoic acid; 2-hydroxynonanoic acid; 2-hydroxydecanoic acid; 2- hydroxyundecanolc acid; 2-hydroxydodecanoic acid (alpha- hydroxylauric acid); 2-hydroxytetradecanolc acid (alpha- hydroxy my ristic add); 2-hydroxyhexadecanoic acid (alpha- hydroxypaimitic acid); 2-hydroxyoctadecanoic acid (alpha- hydroxystearic acid); 2-hydroxyeicosanolc acid (alpha- hydroxyarachidonic acid); 2-phenyl 2-hydroxyethanoic acid (mandelic add); 2,2-diphenyl 2-hydroxyethanoic acid (benzilic add); 3-phenyl 2-hydroxypropanoic acid (phenyl lactic acid); 2-phenyl, 2-methyl, 2-hydroxyethanoic add (atrolactic acid); 2- (4'-hydroxyphenyl) 2-hydroxyethanoic acid; 2- (4'-chlorophenyl 2-hydroxyethanolc acid; 2- (3'- hydroxy-4'-methoxyphenyl) 2-hydroxyethanoic add; 2- (4'- hydroxy-3'-methoxyphenyl) 2-hydroxyethanolc add; 3'- (2- hydroxyphenyl) 2-hydroxypropanolc acid; 3- (4'-hydroxyphenyl) 2-hydroxypropanoic acid; and 2- (3', 4'-dihydroxyphenyl) 2- hydroxyethanoic acid.
I^ost preferred alpha hydroxy acid in the skin care compositions of the present invention are glycolic acid, lactic acid, 2-hydroxyoctanolc acid or combinations thereof.
Illustration of beta-hydroxy carboxylic add is salicylic acid. The skin care composition of the present invention comprises a mixture of both a beta-hydroxy carboxylic acid and an aipha-hydroxy carboxylic acid.
In a particularly preferred aspect of the invention the acidic skin benefiting Ingredients comprises a mixture of both a beta-hydroxy acid and an alpha-hydroxy acid. For instance, the optimum combination is a mixture of salicylic acid and lactic acid in a relative weight ratio from about 20: 1 to about 1: 20, preferably from about 10: 1 to 1 : 1, optimally from about 3: 1 to about 2: 1.
Amounts of acidic skin benefit agents such as alpha & beta hydroxy acids In the skin care composition of the Invention are in the range of about 0.1 to about 20% by weight, preferably about 0.50% to about 15 %.other Optional Skin Benefiting Materials and Cosmetic Adjuncts:
Other suitable skin benefiting agents in the skin care composition of the present invention may include but are not limited to anti-aging, wrinkle-reducing, skin whitening, anti-acne, wound healing, moisturizing, sebum reducing agents, hair growth regulating agents, vitamins, Proteins and minerals, UV diffusing/protection agents. Examples of these include kojic acid and esters, ferulic acid and ferulate derivatives, vanillic acid and esters, dioic acids (such as sebacic and azelaic acids) and esters, retinol, retinal, retinyl esters, hydroquinone, t-butyl hydroquinone, calcium alginate, hyaluronic acid, vitamin E acetate, ascorbic acid and its derivatives, mulberry extract, licorice extract, Hydrolysed Soy protein,Hydrolysed milk protein ,Allantoin, panthanol and phenolic acid, glycosidic polyhydroxybenzylate derivatives and inorganic and organic sun protecting agents.
Fatty alcohols are generally selected from those with a carbon chain length C8-C22. It is preferred that the fatty alcohol is a saturated fatty alcohol. It is also particularly preferred that at least 50% of the total fatty alcohols, by weight of fatty alcohol, are solid at a temperature of at least SS'C. The total concentration of the fatty alcohol is in the range from 0.1 to 3% by weight of the cosmetic composition and more preferably from 0.25 to 1.5%
Emollient materials in the form of, silicone oils and synthetic esters may or may not be incorporated into compositions of the present invention. Amounts of the emollients may range anywhere from about 0,1 to about 30%, preferably between about 0.5 to 20% by weight.
Silicone oils may be divided into the volatile and non-volatile variety. The term "volatile" as used herein refers to those materials which have a measurable vapor pressure at ambient temperature. Volatile silicone oils are preferably chosen from cyclic or linear polydimethylsiloxanes containing from about 3 to about 9, preferably from about 4 to about 6, silicon atoms.
Linear volatile silicone materials generally have viscosities less than about 5 centistokes at 25 while cyclic materials typically have viscosities of less than about 10 centistokes.

Nonvolatile silicone oils useful as an emollient material Include polyalkyi slloxanes, polyail Suitable ester emollients include: (1) alkenyl esters of fatty acids having 10 to 20 carbon atoms, such as methyl myristate, methyl stearate, oleyl myrlstate, oleyl stearate, Octy Palmitate or butyl oleate; (2) ether-esters such as fatty acid esters of
; ethoxylated fatty alcohols; (3) polyhydric alcohol esters, such as ethylene glycol mono and di-fatty acid esters, diethylene glycol mono-and di-fatty acid esters, polyethylene glycol (200-6000) mono- and dl-fatty acid esters, propylene glycol mono-and di- fatty acid esters, polypropylene glycol 2000 monooleate, polypropylene glycol 2000 monostearate, ethoxylated propylene glycol
i monostearate, glyceryl mono-and di-fatty acid esters, polyglyceroi poly-fatty esters, ethoxylated glyceryl monostearate, 1,3-butyiene glycol monostearate, 1,3-butyiene glycol distearate, poiyoxyethylene polyol fatty acid ester, sorbitan fatty acid esters, C12-15 Aikylbenzoate and poiyoxyethylene sorbitan fatty acid esters; (4) wax esters such as beeswax, spermaceti, myristyl myristate, stearyl stearate; (5) sterols esters, such as cholesterol fatty acid esters.
The preferred ester emollients are isopropyl myristate,isopropyl paimitate,isostearyl palmitate, tridecyl salicylate,C12-15 octanoate, C12-15 Alkyl Banzoate and isopropyl stearate or any mixtures thereof.
;The inventive compositions most preferably further include an Ingredient selected from the group consisting of antioxidants, reducing agents, chelating agents, and mixtures thereof to improve the stability of the cosmetic cream. These ingredients
; provide an additional level of protection against oxidation of skin benefit agents In the cosmetic cream. Common examples of antioxidants, reducing agents and chelating agent for the present formulations can be found In the CTFA International Cosmetic Ingredient Dictionary 4 '^ Edition, The Cosmetic, Toiletry, and Fragrance Association, Inc., Washington, D.C., 1991.
Preferable antioxidants are 6-hydroxy-2, 5, 7, 8-tetra-methylchromane-2-carboxylic iacid (trolox), propyl gallate, n-propyl tri hydroxy be nzoate, t-butyl hydroquinone and butylated hydroxytoluene (BHT), butylated hydroxyanisole (BHA), tocopheryl acetate, ascorbyl palmitate, hydroquinone, dibutyl hydroquinone and the like. Suitable examples of chelating agents include, EDTA, citric acid, tartaric acid, organo- aminophosphonic acids and organo phosphonic acid components including certain of the commercially available Dequest TM compounds, marketed by Monsanto. Preferred is EDTA-disodium.
Antioxidants are further included in the skin care composition of the present invention in an amount of from 0.01 to 10%, preferably from 0.1 to 5%, most preferably from 0.2 to 4%. Reducing agents are included in the inventive ; compositions in an amount of from 0.01 to 10%, preferably from 0.1 to 5%, most ; preferably from 0.2 to 4%. Chelating agents are included in the inventive compositions in an amount of from 0.01 to 1%, preferably from 0.05 to 0.5%, most preferably from 0.05 to 0.3%.
Humectants of the polyhydric alcohol-type may also be employed as cosmetically acceptable carriers In compositions of this invention. The amount of humectant may range anywhere from 0.5 to 30%, preferably between 1 and 15% by weight of the composition.
The skin care composition of the invention preferably includes an effective amount of : a sunscreen and/or sun-biock agent to enhance synergistically the benefit of the
composition for better sun protection. Organic and inorganic sunscreens/sun-blocks i or combinations thereof may be suitably employed in the composition.
I Ultraviolet light Is a predominant cause of skin darkening. Thus, compositions comprising UVA and/or UVB sunscreen are desirable.
A wide variety of conventional sunscreen agents suitable for use in combination with the skin lightening composition of the present Invention wherein such suitable
I sunscreen agents include, p-aminobenzoic acid, its salts and its derivatives (ethyl, isobutyl, glyceryl esters; p-dlmethylaminobenzoic acid); anthranilates (i.e.,o-aminobenzoates; methyl, menthyl, phenyl, benzyl, phenylethyl, linalyl, terplnyl, and cyclohexenyl esters); salicylates (amyl, phenyl, benzyl, menthyl, glyceryl, and dipropyleneglycol esters); cinnamic acid derivatives (menthyl and benzyl esters, a-phenyl cinnamonitrile; butyl cinnamoyi pyruvate); dihydroxycinnamic acid derivatives (umbelliferone, methylumbelliferone, methyiaceto-umbelliferone);

trihydroxycinnamic acid derivatives (esculetin, methylesculetin, daphnetin, and the glucosides, esculin and daphnin); hydrocarbons (diphenylbutadiene, stilbene); dibenzaiacetone and benzalacetophenone; naphthol-sulfonates (sodium salts of 2-naphthol-3,6-disulfonic and of 2-naphthol-6,8-disulfonic acids); di-hydroxy-naphthoic acid and its salts; o-and p- hydroxybiphenyldisulfonates; coumarin derivatives (7-hydroxy, 7-methyl, 3-phenyl); diazoles (2-acetyl-3- bromoindazole, phenyl benzoxazole, methyl naphthoxazole, various aryl benzothiazoles); quinine salts (bisulfate, sulfate, chloride, oleate, and tannate); quinoline derivatives (8-hydroxyquinoline salts, 2-phenylquinollne); hydroxy-or methoxy-substituted benzophenones; uric and vilouric acids; tannic acid and its derivatives (e. g., hexaethylether); (butyl carbotol) (6-propyl piperonyl) ether; hydroquinone; benzophenones (oxy-benzene, sulisobenzone, dioxybenzone, benzoresorcinol, 2, 2', 4, 4'-tetrahydroxybenzophenone, 2, 2'-dihydroxy-4, 4'- dimethylbenzophenone, octabenzone); 4-isopropyldibenzoylmethane; butyl-methoxydibenzoylmethane; etocrylene; and 4-isopropyl-di-benzoylmethane.
Of these, 2-ethylhexyl-p-methoxycinnamate, 4, 4'-t- butylmethoxydibenzoyl-methane, 2-hydroxy-4- methoxybenzophenone, octyldimethyl-p-aminobenzoic acid, digalloyltrioleate, 2, 2-dihydroxy-4- methoxybenzophenone, ethyl-4- (bis (hydroxypropyl) ) aminobenzoate, 2-ethylhexyl-2- cyano-3,3-diphenylacrylate, 2-ethylhexylsalicylate, glyceryl-p-aminobenzoate, 3,3, 5- trimethylcyclohexylsalicylate,methylanthranilate, p- dimethyl-aminobenzoic acid or aminobenzoate, 2-ethylhexyl-i p- dimethyl-amino-benzoate, 2-phenylbenzimidazole-5-sulfonic acid, 2- (p-dimethylaminophenyl)-5-sulfonicbenzoxazoic acid and mixtures of these compounds, are preferred.
More preferred sunscreens useful in the compositions are 2-ethylhexyl- p-
I methoxycinnamate, butylmethoxydibenzoylmethane, 2-hydroxy- 4-
methoxybenzophenone, octyldimethyl-p-aminobenzoic acid and mixtures thereof.
A safe and effective amount of sunscreen may be used in the composition of the present invention useful in the subject invention. The composition preferably comprises from about 0.1% to about 10%, more preferably from about 0.1% to about 5%, of one or more sunscreen agent (s).
Useful inorganic sunscreens or sun-blocl 20

Ultra fine titanium dioxide in either of its two forms, namely water-dispersible
titanium dioxide and oil- dispersible titanium dioxide is especially suitable for the
invention.
Water-dispersible titanium dioxide is ultra-fine titanium dioxide, the particles of
which are non-coated or which are coated with a material to impart a hydrophilic
surface property to the particles. Examples of such materials include aluminium
oxide and aluminium silicate.
Oil-dispersible titanium dioxide is ultra fine titanium dioxide, the particles of which
exhibits a hydrophobic surface property, and which, for this purpose, can be coated
with metal soaps such as aluminium stearate, aluminium laurate or zinc stearate, or
with organosilicone compounds.
By topical application to the sl The total amount of inorganic sunscreen or sun blocl Suitable anti-irritancy agents include gluconolactone, borage seed oil, wild borage, dextran, alpha-bisabolol (extracted from chamomille), azulene (extracted from yarrow), resveratrol, petroseienic acid and combinations thereof. Each of these can be present at levels ranging from about 0.0001 to about 5%, preferably from about 0.001 to about 1%, optimally from about 0.01 to about 0.5% by weight of the composition.
Anti-microbial agents may also be useful In compositions of the present invention. Typically the anti-microbial agents are selected from triclosan, tricarbanilide, tea tree oil, farnesol, farnesol acetate, hexachiorophene, C4-C20 quaternary ammonium salts such as benzalconium chloride and a variety of zinc or aluminum salts. Amounts of the anti-microbial agent may range from about 0.1 to about 5%, preferably from ; about 0.2 to about 1%, optimally about 0.3% by weight of the composition. Preservatives may also desirably be incorporated into the cosmetic compositions of this invention to protect against the growth of potentially harmful microorganisms. Suitable traditional preservatives include ail 21

other preservatives which have more recently come into use include hydantoin derivatives, propionate salts, and a variety of quaternary ammonium compounds. Cosmetic chemists are familiar with appropriate preservatives and routinely choose them to satisfy the preservative challenge test and to provide product stability. Particularly preferred preservatives are phenoxyethanol, methyl paraben, butyl paraben, propyl paraben, imidazolidinyl urea (commercially available as Germall 1157), sodium dehydroacetate and benzyl alcohol.
The preservatives should be selected having regard for the use of the composition and possible incompatibilities between the preservatives and other ingredients in the emulsion. Preservatives are preferably employed in amounts ranging from about 0.01% to about 2% by weight of the composition.
Herbal extracts may also be included as components of the composition and are particularly effective for controlling the level of sebum/oil. Suitable extracts include horseradish, oats, neem, beet, broccoli, tea, pumpl : Other optional ingredients may include coloring agents, opacifiers and pigments (e.g titanium dioxide,silica) and perfumes. Amounts of these materials may range anywhere from 0.001% up to 20% by weight of the composition. The invention is described hereunder in greater detail in relation to the following non-limiting exemplary illustrations as per the following examples:
Example 1: Anti ageing Cream

Triclosan 0.15
The above said composition is prepared in the following fashion. Oil Phase A mixture is heated to 78 "C. Water Phase B mixture Is heated to 75 "C In a separate vessel from that of Phase A. Add phase A mixture to phase B mixture with high speed mixing followed by homogenizatlon for 15 minutes and start cooling. Cool the mixture to 40 °C and then add the remaining ingredients. Cool the mixture to room temperature and then pack.
The above said composition is prepared in the following fashion. Oil Phase A mixture is heated to 78. Water Phase B mixture is heated to 75 In a separate vessel from that of Phase A. Add phase A mixture to phase B mixture with high speed mixing followed by homogenization for 15 minutes and start cooling. Cool the mixture to 40 and then add the remaining ingredients. Cool the mixture to room temperature and then pack.
Example 3: Moisturising Lotion

Phase Ingredient Name Quantity in g/100 g
Triclosan 0.15
The above said composition is prepared in the following fashion. Oil Phase A mixture is heated to yS'C. Water Phase B mixture is heated to 75 "C in a separate vessel from that of Phase A. Add phase A mixture to phase B mixture with high speed mixing followed by homogenization for 15 minutes and start cooling. Cool the mixture to 40 "C and then add the remaining ingredients. Cool the mixture to room temperature and then pack.
The above said composition is prepared in the following fashion.
Oil Phase A mixture is heated to 78 °C. Water Phase B mixture is heated to 75 "C in a
separate vessel from that of Phase A. Add phase A mixture to phase B mixture with
high speed mixing followed by homogenization for 15 minutes and start cooling. Cool
the mixture to 50 °C and then add the Phase C mixture. Cool the mixture to 40 "C
temperature and then add phase D mixture. Cool the mixture to room temperature
and then pack.
A series of tests were conducted and established the stability of the preferred above
stated composition containing cationic & non-ionic emulsifiers as stabilizing agents
for low pH vanishing creams wherein the pH of products was found to be Thus the present invention provides for a stable lower irritancy skin care cosmetic compositions having skin compatible pH preferably in the range of 3.0-6.0 involving skin compatible emulsifiers. The said low pH skin care cosmetic composition comprising of an emulsifier system involving cationic salts of amido amine and optionally a non-ionic emulsifier applicable in vanishing cream formulations facilitated in attaining a stable, low pH, low irritancy, vanishing cream like skin care cosmetic composition inspite of high level incorporation of high molecular weight fatty acid ingredients and acidic skin care agents in the said skin composition for vanishing attributes of the said composition. Importantly, therefore the cosmetic skin care composition of the present invention facilitates better incorporation of skin benefiting agents and cosmetic adjuncts without compromising on the desired stability, pH range and the vanishing cream like attributes of the skin care composition.

WE CLAIM:
1. A low pH (pH = 3.0- 6.0) skin care cosmetic composition comprising of (a) an emulsifier system obtained from one or more cationic salts of amido amines and optionally one or more non-ionic emulsifier, (b) at least one high molecular weight fatty acid in amount of 6-22% by weight of the composition and (c) a cosmetically acceptable vehicle with or without other skin benefiting agents including acidic skin care agents.
2. A low plH skin care cosmetic composition as claimed in Claim 1 comprising of:
b) an emulsifier system comprising one or more cationic salts of amido amines in the range of 0.1% to about 2% by wt. of the composition, and optionally one or more non-ionic emulsifier in the range of from 0.01% to 10% by wt. of the composition;
b) at least one high molecular weight fatty acid ingredient in at least 6 % by weight
of the composition; and
c) a cosmetically acceptable vehicle with or without other skin benefiting agents
including acidic skin care agents.
3. A low pH skin care cosmetic composition as claimed in claim 2 wherein the said emulsifier system comprising of cationic amido amine salts Is obtained from (a) amido amine (s) in the range of 0.1% to 2%, preferably 0.5% to 1.5% by weight of the said composition and preferably selected from amido amine of the formula R^ -C(0)-NH(CH2)n - R^ wherein R^ = C7 - C23 Aliphatic hydrocarbon radical, R^ = dialkylamino or a heterocyclic amino group and n = 2, 3 more preferably C16-C22 alky! amidopropyl dimethyl amine and (b) low molecular weight inorganic or organic acidic neutralizer (s) in the range of 0.01% to about 2%, preferably 0.05% to 0.75% by weight of the said composition and preferably selected from acids having groups such as -OH, -CI, -NHz, -C=C-, aliphatic, aromatic and exemplified by acids such as glycoiic acid, lactic acid, 2-hydroxy octanoic acid, salicylic acid, citric acid, malic acid, maleic acid, hydrochloric acid, acetic acid, propionic acid, amino acids, benzoic acid and the like and combinations thereof.
4. A low pH skin care cosmetic composition as claimed in claim 2 wherein the said optional non-ionic emulsifier is in the range of from 0.01% to 10% by wt. of the composition preferably selected form the group of sucrose esters and alkyl
27

glucosides and is present preferably in about 0.5% to about 5%, more preferably about 0.75 % to 2.5% by wt. of the composition
5. A low pH skin care cosmetic composition as claimed in claim 2 wherein the said high molecular weight fatty acid(s) ingredient is selected from the group of C12-C22 fatty acids, preferably C14-C22 fatty acids, such as stearic acid or palmitic acid either as a single high molecular weight fatty acid or even more preferably as a mixture of high molecular weight fatty acids such as a mixture of stearic acid and palmitic acid and is present preferably in amounts of at least 6 % to about 22%, preferably 8% to 22%, more preferably 10% to 18%, by weight of the composition.
6. The composition as claimed in claim 1, wherein the skin benefiting ingredient comprises at least one hydroxy acid such as preferably alpha and/ or beta hydroxy acid or any other desirable acidic skin benefit agents such as salicylic acid
7. The composition as claimed in claim 6, wherein the said hydroxy acid skin benefiting agent comprising at least one hydroxy acid in the range of about 0.1 to about 20% by weight, selected from the group of glycolic acid, lactic acid, 2-hydroxyoctanoic acid, salicylic acid and the like or combinations thereof preferably from about 0.5% to about 15 % by weight.
8. The composition as claimed in anyone of claim 3 to 7 , wherein the amido amine is selected from the group and not limited to stearamidopropyl dimethylamine, lauramidopropyl dimethylamine, cocoamidopropyl dimethyl amine, palmitamidopropyl dimethyl amine, myristamidoethyl dimethylamine behenamidopropyl dimethylamine, Dilinoleamidopropyl Dimethylamine, Isostearamidopropyl Dimethylamine, Oleamidopropyl Dimethylamine, Ricinoleamidopropyl Dimethylamine, Sunflowerseedamidopropyl Dimethylamine, Wheat Germamidopropyi Dimethylamine, Soyamidopropyl Dimethylamine, Tallamidopropyl Dimethylamine, stearamidopropyl morpholine, Isostearamidopropyl morpholine and preferably behenamidopropyl dimethyl amine.
9. A composition as claimed in anyone of claims 1 to 8 wherein the pH ranges from 3 to 6.0 and more preferably ranges from 4 to 5.7.
28

10. A composition as claimed in anyone of claims 1 to 9 wherein tlie skin benefiting
agent includes skin lightening ingredients, moisturizing ingredients, anti-aging
ingredients, sunscreens, anti acne ingredients, sebum regulating ingredients and
other such ingredients as needed and combinations thereof.
11. A process for the preparation of the low pH skin care composition with improved
sensory properties as that of vanishing cream of pH preferably below 6 as claimed in
anyone of claims 1 to 10 comprising (I) providing a separate mix of oil soluble
ingredients including emollients, high molecular weight fatty acids, sunscreens,
preservatives, antioxidants, waxes and any other oil soluble / dispersible ingredients
and heating the mixture to 70°C to 80°C preferably up to (II) providing
separate mix of the water soluble/ dispersible ingredients along with an emulsifier
system comprising cationic salt of amido amine and optionally nonionic emulsifier
heating the mixture to to preferably up to ys (III) preparing the
emulsion at preferably at about 75 by mixing the mix of step I into
mix of step II with thorough mixing followed by homogenization; (IV) cooling the
mixer to below 55 to add skin benefit agents with or without other optional
ingredients including perfume.
12. A process for the preparation of the low pH skin care composition as claimed in
claim 11 wherein the said emulsifier system comprising cationic salt of amido amine
is obtained comprises the steps of a) taking amido amine (s)in water phase and
neutralizing the said amido amine(s) In-situ at 70°C to 80*»C with at least one low
molecular weight inorganic or organic acidic neutralizer to form the respective
cationic salt and b) optionally adding at least one non-Ionic emulsifier (s) at the
same temperature and obtaining the said emulsifier system thereof.
13. The skin care composition with vanishing attributes Involving the said emulsifier
system, the high molecular weight fatty acid and the process to reach to the said
skin care composition substantially as herein described and illustrated in relation to
the accompanying examples.

Documents:

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Patent Number

279643

Indian Patent Application Number

973/CHE/2010

PG Journal Number

05/2017

Publication Date

03-Feb-2017

Grant Date

27-Jan-2017

Date of Filing

08-Apr-2010

Name of Patentee

CAVINKARE PVT. LTD

Applicant Address

CAVIN VILLE, NO.12, CENOTAPH ROAD, CHENNAI-600 018.

Inventors:

#	Inventor's Name	Inventor's Address
1	GIREESH KUMAR MADAYI PUTHIYAVEEDU	M/S. CAVINKARE RESEARCH CENTER, 12, POONAMALLE ROAD, EKKATTUTHANGAL, CHENNAI-600 032.
2	PASUPATHI MURUGESAN	M/S. CAVINKARE RESEARCH CENTER, 12, POONAMALLE ROAD, EKKATTUTHANGAL, CHENNAI-600 032.
3	GOMATHI RAJAGOPAL	M/S. CAVINKARE RESEARCH CENTER, 12, POONAMALLE ROAD, EKKATTUTHANGAL, CHENNAI-600 032.

PCT International Classification Number

A61K 8/41

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA