Title of Invention


Abstract A bar composition comprising a synthetic non-soap surfactant, a hydrophilic structurant, a water insoluble structurant, an oil/emollient benefit agent and a cationic polymer. The cationic polymer has a charge of density greater than 0.007 and is used in a specific ratio to the surfactant.
Full Text FORM2
(39 of 1970)
(See section 10; rule 13)
Title of the invention

HINDUSTAN LEVER LIMITED, a company incorporated under the Indian Companies Act, 1913 having its registered office at Hindustan Lever House, 165/166, Backbay Reclamation, Mumbai-400 020, State of Maharashtra, India
The following specification particularly describes the nature of this invention and the manner in which it is to be performed

The present invention relates to bar compositions capable of delivering benefit agents to the skin. More particularly
the invention relates to bars containing relatively large amounts of hydrophilic structurant (i.e. the ratio of hydrophilic to hydrophobic being at least 1:2, preferably greater than 40:60, more preferably at least 1:1 and most preferably above 1:1) and in which cationic polymer, " particularly cationic polymer having minimum level of charge density, has been found to unexpectedly enhance deposition of benefit agent in such bars.
Cationic polymers are well known in the art. For example in liquid cleansers, cationic hydrophilic polymers such as
(R) (R)
Polymer JR from Americhol or Jaguar from Rhone Poulenc
have been used to enhance delivery of benefit agents (as described in for example EP 93,602; WO 94/03152; and WO 94/03151).
Cationic polymers have also been used in bar formulations. U.S. Patent No. 3,761,418 to Parran, Jr., for example, teaches detergent composition (including bar soaps) containing water insoluble particulate substances such as antimicrobial agents and certain cationic polymers to enhance deposition and retention of such particulate substances. Although bar soap formulations are used in the examples, all of the formulations are primarily structured with soap and/or fatty acid. Further, not only are benefit agents (oils/emollients) not disclosed, but it would also be

expected that hydrophobic structurants would interfere with deposition of &ny such oils/emollierits.
WO No. 95/26710 to Kacher et al. (assigned to P&G) teaches skin moisturizing and cleansing bar containing skin cleansing agent and lipid moisturizing agent. A preferred optional" ingredient is one or more cationic polymeric skin conditioning agent added to provide a tactile cue. Again, -however, the bar is made of a rigid crystalline network structure consisting essentially of selected fatty acid soap material. The applicants have found such fatty acid soap material to be detrimental to deposition. "
U.S. Patent No. 5,425,892 to Taneri et al. teaches personal cleansing freezer bars comprising a skeleton structure of neutralized carboxylic acid soap. The patent teaches polymeric skin feel aids, water soluble organics and oils. However the bars, as noted, have a distinctive carboxylic acid structure differing from bars of the invention containing relatively large amounts of hydrophilic structurant.
Hydrophilic structured bars themselves are also taught, for example, in U.S. Patent No. 5,520,84 0 to Massaro et al. or U.S. Patent No. 5,540,854 to Fair et al. There is no teaching in these" references, however, of cationic polymers, and no suggestion that such cationics could enhance deposition of oil/dmollients in bars containing relatively large amounts of hydrophilic structurant. Further there is no teaching or suggestion in this or any other reference of a critical cationic to surfactant ratio above which

deposition of oils/emollients is significantly enhanced or that eat ionics must have minimum level of charge density.
Finally, U.fi. Patent No. S,2«2,079 to Kacher et al. teaches firm, wild neutral pH cleansing bare comprising 5-50% by wt. monocarboxylic fatty acids (which provides skeletal structure), 20 to 65% bar firmness aid and IS* to S5* water. The bars may contain optional polyols (0-40%) as *bar firmness aids*. The bars are primarily fatty acid structured, and the only bar firmness aids exemplified are isethionate (i.e., they do not have minimum levels of hydrophilio to hydrophobic structuranc). Further, cationics disclosed are guar, quaternised guar etc., all of which have charge density below 0.007. There is thU6 no recognition that only cationie polymers having a minimum charge activity are adequate for purpose of the invention.
Suddenly and unexpectedly, the applicants have.discovered that cat ionics, i.e.. cationie polymers of a minimum, charge density level, can be used to enhance deposition of oils/emollients in bars comprising a relatively large amount of hydrophilic structurant (e.g./ the ratio of hydrophilie to hydrophobic structurant being at least it2, preferably greater than 40:60, more preferably at least 1:1 and most
preferably above 1:1; further that the .total soap and
hydrophobic structurant. exceeds -"the* "nydiophil ic • structurant by no more than 10% by weight of ."the--total composition) and further that there is a minimum critical ratio of cationie polymer to surfactant at which deposition is remarkably enhanced. In addition, it is critical that levels of surfactant; particularly anionic, not exceed

certain ranges (lest deposition be affected), and that minimum amounts of oil/emollient be used.
More specifically, the subject invention relates to bar compositions comprising:
(a) 10 to 50%, preferably 20% to 40% by wt. of a synthetic, non-soap surfactant, preferably an anionic surfactant (e.g., acyl isethionate or alkali metal lauryl ether sulfate);
(b) 10 to 40%, preferably 15 to 35% by wt. of a hydrophilic structurant having a melting point in the range 40° to 100°C (such structurant will generally have solubility of at least 10% at room temperature);
(c) 5 to 20% of a water insoluble structurant with MP in range 40°C to 200°C;
(d) 2% to 40%, preferably 5% to 20% benefit agent; and
(e) 1.0% to 10% cationic polymer,-
wherein the amount of insoluble structurant (c) and soap, if any, present exceeds the amount of hydrophilic structurant (b) by no more than 10% by wt. total bar composition; wherein the amount of cationic polymer (e) is such that ratio of cationic to surfactant is 0.06 to 1 to 1:1, more preferably 0.08:1 to 0.5:1;
and wherein the charge density of cationic polymer (number of monovalent charges per repeat unit divided by molar mass of repeat unit) is greater than 0.007.

The invention will now be further described by way of example only with reference to the accompanying drawing, in which:
" - Figure 1 shows deposition results depending on ratio of - cationic to surf actant. As seen, only when ratio of
cationic to surfactant" reaches certain minimum level does
deposition significantly increase.
The present invention relates to relatively low active bars (e.g., SO* active, preferably less than 40%, more preferably 30* and less active) wherein there is present a relatively
large atnount of hydrophilic structU£ant_(hvdrophobde __.!_ „
structurant and soap, if present, comprises no-more than about 10% by wt. more than amount of hydrophilic structurant) and which further comprises-relatively large amount of oil/emollient (i.e., at least 2k). Unexpectedly, the applicants have discovered Chat when the ratio of cationic to curfactant in such bars is equal to or above a certain defined ratio, the deposition of benefit agent from the bar is remarkably enhanced. The cationic polymers used must also have minimum defined levels of charge density.
The bar is described in greater detail below.
The bars of the invention contain from about -10* to ~Sfl* by wt. more-preferably is to 40%. of a.-synthecic, non-soap surfactant. Suitable surfactants are generally selected from the group consisting of anionic, nonionic, amphoteric, switeerionic and/or cationic surfactants and mixtures thereof such as are well known in the art.

More specifically, the surfactant system will generally comprise at least one anionic surfactant, a zwitterionic surfactant or, preferably mixtures of anionic or anionics and zwitterionic surfactant.
The anionic surfactant which may be used may be aliphatic sulfonates, such as a primary alkane (e.g., C8-C22)
sulfonate, primary alkane (e.g., C8-C22) disulfonate, C8-C22
alkene sulfonate, C8-C22 hydroxyalkane sulfonate or alkyl
glyceryl ether sulfonate (AGS); or aromatic sulfonates such as alkyl benzene sulfonate.
The anionic may also be an alkyl sulfate (e.g., C12-C18 alkyl
sulfate) or alkyl ether sulfate (including alkyl glyceryl ether sulfates). Among the alkyl ether sulfates are those having the formula:
wherein R is an alkyl or alkenyl having 8 to 18 carbons, preferably 12 to 18 carbons, n has an average value of greater than 1.0, preferably greater than 3; and M is a solubilizing cation such as sodium, potassium, ammonium or substituted ammonium. Ammonium and sodium laurel ether sulfates are preferred.
The anionic may also be alkyl sulfosuccinates (including mono and dialkyl, e.g;, C6-C22 sulfosuccinates); alkyl and

acyl taurates, alkyl and acyl sarcosinates, sulfoacetates, C8-C22 alkyl phosphates and phosphates, alkyl phosphate esters and alkoxyl alkyl phosphate esters, acyl lactates, C8-C22 monoalkyl succinates and maleates, sulphoacetates, alkyl glucosides and acyl isethionates.
Sulfosuccinates may be monoalkyl sulfosuccinates having the formula:
R102CCH2CH(S03M)C02M; and
amide-MEA sulfosuccinates of the formula
wherein R ranges from C8-C22 alkyl and M is a solubilizing cation.
Sarcosinates are generally indicated by the formula RC0N(CH3)CH2C02M, wherein R ranges from C8-C2o alkyl and M is a solubilizing cation.
Taurates are generally identified by formula
2 3
wherein R ranges from C8-C2o alkyl, R ranges from C1-C4
alkyl and M is a solubilizing cation.

Particularly preferred are the C8-C18 acyl isethionates. These esters are prepared by reaction between alkali metal isethionate with mixed aliphatic fatty acids having from 6 to 18 carbon atoms and an iodine value of less than 20, At least 75% of the mixed fatty acids have from 12 to 18 carbon atoms and up to 25% have from 6 to 10 carbon atoms.
Acyl isethionates, when present, will range from about 10% to about 50% by weight of the total bar composition. Preferably, this component is present from about 20% to about 40%.
The acyl isethionate may be an alkoxylated isethionate such as is described in Ilardi et al., U.S. Patent No. 5,593,466, hereby incorporated by reference.
Anionic surfactant may also be a *soap". By soap is meant alkali metal salts of aliphatic alkane- or alkene monocarboxylic acids, more generally known as C12-C22 alkyl
fatty acids. Sodium and potassium salts are preferable. A preferred soap is a mixture of about 15% to about 45% coconut oil and about 55% to about 85% tallow.
The soaps may contain unsaturation in accordance with commercially acceptable standards. Excessive unsaturation is normally avoided.
The anionic component will comprise from about 10% to 50% of the bar composition.

Amphoteric detergents which may be used in this invention include at least one acid group. This may be a carboxylic or a sulphonic acid group. They include quaternary nitrogen and therefore are quaternary amido acids. They should generally include an alkyl or alkenyl group of 1 to 18 carbon atoms. They will usually comply with an overall structural formula:

1 2
where R is alkyl or alkenyl of 7 to 18 carbon atoms; R and
R are each independently alkyl, hydroxyalkyl or
carboxyalkyl of 1 to 3 carbon atoms; n is 2 to 4; ra is 0 to 1; x is alkylene of 1 to 3 carbon atoms optionally
substituted with hydroxyl, and y is -CO2 or -SO3
and amido betaines of formula:
Suitable amphoteric detergents within the above general formula include simple betaines of formula:


-where m is 2 or 3.
In both formulae R is alkyl or alkenyl of 7 to 18 carbons;
2 3
and R and R are independently alkyl, hydroxyalkyl or carboxylalkyl of 1 to 3 carbons. R may in particular be a
mixture of C12 and C3.4 alkyl groups derived from coconut so
that at least half, preferably at least three quarters of
1 2 3
the groups R have 10 to 14 carbon atoms. R and R are
preferably methyl.
A further possibility is that the amphoteric detergent is a sulphobetaine of formula:

where m is 2 or 3, or variants of these in which -{0*2)3803 is replaced by

1 2 3 In these formulae R , R and R are as discussed for the
amido betaine.
Amphoteric generally comprises 1% to 10% of the bar composition.
Other surfactants (i.e., nonionics, cationics) may also be optionally used although these generally would not comprise more than .01 to 20% by wt. of the bar composition.
Nonionic surfactants include in particular the reaction products of compounds having a hydrophobic group and a reactive hydrogen atom, for example, aliphatic alcohols, acids, amides or alkyl phenols with alkylene oxides, especially ethylene oxide either alone or with propylene
oxide. Specific nonionic detergent compounds are alkyl (C6-C22) phenols-ethylene oxide condensates, the condensation

products ©f aliphatic (C8-C18) primary or secondary linear or branched alcohols with ethylene oxide/ and products made by condensation of ethylene oxide with the reaction products of propylene oxide and ethylenediamine. Other so-called nonioaic detergent compounds include long chain tertiary amine oxides,, long chain tertiary phosphine oxides and dialkyl sulphoxides.
The nonionic may also be a sugar amide, such as a polysaccharide amide. Specifically, the surfactant may be one of the lactobionamides described in U.S. Patent No. 5,389,27$ to Au et al. which is hereby incorporated by reference and polyhydrcocyamides such as described in U.S. Patent JSo. 5,312,954 to Lfttton et al.« hereby incorporated into the subject-application by reference.
Examples of cationic detergents are the quaternary ammonium compounds such as alkyldimethylammonium halogenides.
other surfactants which, may be used are described in U.S. Patent No. 3,723,325 to Parran Jr, suid »Surface Active Agents and Detergents" (Volume I & II) by Schwartz, Perry 6 Berch, both of which are also incorporated into the subject application by reference.
-/A preferred composition comprises at least 1-cHbacyl isethionate and 1% to 101 betaine.
Another critical compound of the bar "is hydrophilic structurant (e.g., polyalkylene glycol).

Thia component comprises 10% by wt. to 40%, preferably • - 15% to 33% -by wt of the bar composition, ■
The structurant has a melting point of 40° to 100°C, preferably 45CC to 100°C, more preferably 50" to &0°C. Generally these s"tructuranta will be at least 10% water soluble at room temperature.
Materials which are envisaged as the water soluble structurant (b) are moderately high molecular weight polyalkylene oxides of appropriate melting point and in particular polyethylene glycols or mixtures thereof.
Polyethylene glycols (PEG"S) which may be used may have a irolecular weight"in the range 1,500*20/000.
It should be understood that each product (e.g./ Union
Carbide"s Carbowax® (FEC-8,000) represents a distribution of
molecular weights* Thus PEG 8,000/ for exatnple, has an average MW range-of 7,000-9,000, while PEG 300 has an average MW range ."from 285 to 315. The average MW of the product can be anywhere between the lovr and high value, and there may still be a good portion of the material with MW below the low value and above the high value.
in some embodiments of this invention it is preferred to include a fairly small quantity of polyalkylene glycol (e.g., polyethylene glycol) with a molecular weight in the range from 50,000 to 500,000, especially molecular weights of around 100,000. Such polyethylene glycols have been

found to improve the wear rate of the bars. It is believed that this is because their long polymer chains remain entangled even when the bar composition is wetted during
If such high molecular weight polyethylene glycols (or any other water soluble high molecular weight polyalkylene oxides) are used, the quantity is preferably from 1% to 5%, more preferably from 1%~ or 1.5% to 4% or 4~,5% by weight of the composition. These materials will generally be used jointly with a larger quantity of other water soluble structurant (b) such as the above mentioned polyethylene . glycol of molecular weight 1,500 to 10,000.
Some polyethylene oxide polypropylene oxide block copolymers melt at temperatures in the required range of 40 to 100°C and may be used as part or all of the water soluble structurant (b). Preferred here are block copolymers in which polyethylene oxide provides at least 40% by weight of the block copolymer. Such block copolymers may be used, in mixtures with polyethylene glycol or other polyethylene glycol water soluble structurant.
In addition, there may be a mixture of lower and higher MW polyalkylene glycols as described in U.S. Patent No. 5,683,973 to Post et al., hereby incorporated by reference into the subject application.
It should be noted that, although they may not necessarily be used by themselves, certain water soluble adjuvant fillers may be used in combination with the water soluble

structurant. Among these, for example, are included maltodextrin and similar water soluble starches- If included, these adjuvants would comprise no more than about 10% by wt. of the composition.
The water insoluble structurants are also required to have a melting point in the range 40-200°C, more preferably at least 50°C, notably 50°C to 90°C. Suitable materials which" are particularly envisaged are fatty acids, particularly those having a carbon chain of 12 to 24 carbon atoms. Examples are lauric, myristic, palmitic, stearic, arachidonic and behenic acids and mixtures thereof, sources of these fatty acids are coconut, topped coconut, palm, palm kernel, babassu and tallow fatty acids and partially or fully hardened fatty acids or distilled fatty acids. Other suitable water insoluble structurants include alkanols of 8 to 20 carbon atoms, particularly cetyl alcohol. These materials generally have a water solubility of less than Sg/litre at 20°C.
The relative proportions of the water soluble structurants and water insoluble structurants govern the rate at which the bar wears during use. The presence of the water insoluble structurant tends to delay dissolution of the bar when exposed to water during use and hence retard the rate of wear.
In general, insoluble structurant will comprise 5 to 20% by wt. of the composition.


(e) hydrocarbons such as liquid paraffins, petroleum jelly,
microcrystalline wax, ceresin, squalene, sgualane, and
mineral oil;
(f) higher fatty acids such as lauric, myristic, palmitic, stearic, behenic, oleic, linoleic linolenic, lanolic, isostearic and poly unsaturated fatty acids (PUFA) acids;
(g) higher alcohols such as lauryl, cetyl, steryl, oleyl, behenyl, cholesterol and 2-hexadecanol alcohol;
(h) esters such as ce"tyl octanoate, myristyl lactate, cetyl
lactate, isopropyl myristate, myristyl myristate, isopropyl
palmitate, isopropyl adipate, butyl stearate, decyl oleate,
cholesterol isostearate, glycerol monostearate, glycerol
distearate, glycerol tristearate, alkyl lactate (for example
lauryl lactate), alkyl citrate and alkyl tartrate;
(i) essential oils such as fish oils, mentha, jasmine,
camphor, white cedar, bitter orange peel, ryu, turpentine,
cinnamon, bergamont, citrus unshiu, calamus, pine, lavender,
bay, clove, hiba, eucalyptus, lemon, starflower, thyme,
peppermint, rose, sage, menthol, cineole, eugenol, citral,
citronelle, borneol, linalool, geraniol, evening primrose,
camphor, thymol, spirantol, pinene, limonene and terpenoid
(j) lipids such as cholesterol, ceramides,.sucrose esters
and pseudo-ceramides as described in European Patent
application No. 556,957;
(k) vitamins such as vitamin A and E, and vitamin alkyl
esters, including those vitamin C alkyl esters;
(1) sunscreens such as octyl methoxyl cinnamate (Parsol
MCX) and butyl methoxy benzoylmethane (Parsol 178 9);
(m) phospholipids;

(n) humectants such as glycerin, propylene glycol and sorbitol; and (o) mixtures of any of the foregoing components.
Where adverse interactions between the benefit agent and surface active are likely to be particularly acute, the benefit agent may be incorporated in the compositions of the invention in a carrier.
Such benefit agents include lipids? alkyl lactates; sunscreens; esters such as isopropyl palmitate and isopropyl myristate; and vitamins. The carrier can, for example, be a silicone or hydrocarbon oil which is not
solubilized/micellized by the surface active phase and in which the benefit agent is relatively soluble.
Particularly preferred benefit agents include silicone oils, gums and modification thereof, esters such as isopropyl palmitate and myristate and alkyl lactates, and vegetable oils such as sunflower seed oil.
The benefit agent can be provided in the form of an emulsion.
The benefit agent of the invention may also function as a carrier to deliver efficacy agents to skin treated with the compositions of the invention. This route is particularly useful for delivering efficacy agents which are difficult to deposit onto the skin or those which suffer detrimental interactions with other components in the composition. In such cases the carrier is as often a silicone or hydrocarbon

oil which is not solubilized/micellized by the surface active phase and in which the efficacy agent is relatively soluble. Examples of such efficacy agents include anti¬viral agents; hydroxycaprylic acids; pyrrolidone; carboxylic acids; .3,4,4" -trichlorocarbanilide; benzoyl peroxide;. perfumes; essential oils; germicides and insect repellents such as 2,4,4"-trichloro-2"-hydroxydiphenyl ether (Irgasan DP3 00); salicylic acid; willow extract, N,N-dimethyl m-toluamide (DEET) ; and" mixtures thereof. ~~
The benefit agent comprises 2 to 40%, preferably 5 to 20% by wt. of the composition.
Finally, the cationic polymer (deposition aid) is a water soluble cationic polymer or copolymers having a molecular weight from about 1,000 to 2,000,000 and a high cationic charge density. Specifically, the cationic charge density should be at least 0.007 and higher where cationic charge density is defined as number of monovalent charges per repeat unit divided by the molar mass of repeat unit.
(R) Thus, for example, a Jaguar type cationic such as Jaguar
(R) C14S (such as used in example RR of Kacher et al. Patent
No. 5,262,079) has charge density of 0.0008, below the
threshold of invention as does [N-[-3 -(dimethylammonio)
(R) propyl] urea dichloride (Mirapol A15 ) which has charge
density of 0.00661. By contrast, dimethyldiallylammonium
(R) chloride (Mirquat 100 ) has density of 0.00793 and is
within the invention.
2 O

It is also important for the cationic polymer to be (a) fully hydrated prior to incorporation in the bar formulation and (b) at a concentration of 1% by wt. or higher for the desired benefit, i.e., enhanced deposition. The commercial application (usefulness) of the said invention would therefore require the cationic polymer to.be at a relatively high concentration when hydrated to avoid the impracticality, difficulty and high costs of drying the syndet bar formulation. A cationic polymer such as dimethyldiallylammonium chloride (Tradename Mirquat 100) can be prepared at concentrations of 40% (60% water), whereas the low charge density quatemized guar cationic polymer (Tradename Jaguar C14s) exemplified by Kacher et al. can only be prepared at concentrationa of approximately 3% (97% water) and are not practical on a commercial scale.
Exemplary cationic polymers which may be used according to the invention include Salcare® type polymers from Allied
Colloids, and Merquat® type polymers from Calgon.
Those cationic polymers which are generally not applicable according to the invention are the high molecular weight, low charge density polymere such as Polymer JR-400® from Amerchol and cationic polysaccharides of the cationic guar gum class such as Jaguar C14S® from Rhone-Poulenc.
It is an important aspect of the invention that there be a minimum amount of cationic polymer be used. The ratio of cationic to surfactant is 0.06:1 to 1:1, more preferably 0,08 to 1 to 0.5 to 1.

In addition ratio of hydrophilic structurant to total of soap and hydrophobic structurant should be at least 1:2, preferably 40:60, more preferably at least 1:1 and most preferably greater than 1:1.
Except in the operating and comparative examples, or where otherwise explicitly indicated, all numbers in this description indicating amounts or ratios of material or conditions of reaction,- physical properties of materials and/or use are to be understood as modified by the word "about".
Further, when used in the specification and claims, the term comprises or comprising is to be understood to specify the presence of stated features integers, steps, components etc., but not to preclude the presence or addition of one or more features, integers, steps, components or groups thereof.
The following examples are intended to further illustrate the invention and are not intended to limit the claims in any way.
Sodium cocoyl isethionate was supplied by Lever Baltimore, Polyethylene glycol (PEG 8 000) was supplied by Union

Carbide, and Merquat 100 (cationic polymer) was supplied by Calgon Corporation. Polydimethylsiloxane (PDMS) with viscosity of 60,000 cs was from Dow Corning, Maltodextrin was from Grain Processing Corp., and the cocoamidopropyl betaine was from Goldschmidt Palmitic, stearic acid, and sodium stearate were supplied by Unichema.
In-Vivo Deposition Measurements
Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy (ATR-FTIR) was the analytical technique used to measure silicone deposition. The standard procedure is documented below.
Formulation Processing
Bar formulations were prepared in a 2-liter Patterson mixer. The fatty acid and sodium stearate were mixed together at 90°C. Cocoyl isethionate was then added followed by the betaine and minor ingredients. After mixing for thirty minutes and drying to approximately 7% water, a polyethylene glycol and maltodextrin was added. This was mixed for an additional ten minutes. The cover was removed and the silicone and Mirquat 100 were added. The moisture content was determined by Karl Fisher titration with a turbo titrator.
At the final moisture level (-5%), the formulation was dropped onto a heated applicator roll and then was chipped over a chill roll. The chill roll chips were plodded in a Weber Seelander duplex refiner with screw speed at -2 0 rpm.

The nose cone of the plodder was heated to 45-50°C. The cut billets were stamped using a Weber Seelander L4 hydraulic press with a nylon, pillow-shaped die in place.
The incorporation of benefit agent (e.g.,
polydimethylsiloxane) into Dove -like compositions (e.g.,
high acyl isethionate bars structured with fatty acid) or primarily soap based compositions results in negligible deposition of the benefit agent. High surfactant levels (e.g., 60%) and insoluble structurants (e.g., fatty acid), generally inhibit transfer of benefit agent onto the skin.t Even addition into lower active, hydrophilic structured bars such as those taught in U.S. Patent No. 5,520,840 to Massaro et al. result in little deposition. In order to study effect of cationic polymer in such low active, hydrophilic structurant bars, however, the following compositions were prepared.


In general, compositions were prepared by mixing ingredients at temperature sufficiently high to provide mix, cooling on chill roll to form chips/flakes, extruding, cutting and stamping. Compositions made are set forth in Table 1 above.
Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy (ATR-FTI) was the analytical technique used to measure silicone deposition. In the standard procedure, the test bar is wetted and rotated ten times in the hand, the inner forearm is then wetted and the bar is rubbed ten times on the forearm. This is followed by a thirty second wash and a fifteen second rinse. The arm is then dried and an infrared scan of the inner forearm is obtained. The
silicone is quantified by integrating the absorption band
-l -l
between 770cm and 835cm . This is plotted on a standard
curve and the deposition value in ug/cm is reported.

The deposition results of the experimental design formulations are summarized in Table 2 and depicted graphically in Figure 1. The wide variance observed is due to different skin types and skin conditions, requiring a "■ minimum of approximately 8 independent measurements per prototype.
Table 2: In-Vivo Deposition of Experimental Design Bars

As can be seen, the amount of oil deposited on the skin appears to be a function of the cationic polymer to surfactant ratio. Specifically, a minimum ratio of 0.06 seems to be required. In the absence of polymer, virtually no silicone is detected on the skin from the bar prototypes. When the polymer:surfactant ratio is increased, a considerable increase in deposition is observed.
The following formulations were selected for further deposition.

For Example 6, ratio cationic/surfactant = 0.083 For Example 7, ratio cationic/surfactant = 0.0625
Example 6 contained 30% sodium cocoyl isethionate (SCI) with 2.5% Merquat and 10% PDMS. In Example, the SCI was increased to 40%. The Merquat and PDMS levels were not changed.
The deposition results from the formulations are depicted in Table 4 below:

Table 4

Table 4 also compares in-vivo deposition from the bar prototypes (Examples 6 & 7) to a liquid body wash (Example 8) . As noted, significantly higher levels of oil are deposited on the skin from the bar prototypes.

1. A bar compositions comprising:
(a) 10% to 50% by wt. synthetic non-soap surfactant selected from the group consisting of anionic, nonionic,. cationic, amphotheric/zwitterionic , surfactants and mixtures thereof;
(b) 10 to 40% by wt. of a hydrophilic structurant having a melting point in the range of 40 ° to 100°C;
(c) 5% to 20%. by wt. of a water insoluble structurant with MP 40° to 200°C;
(d) 2% to 40% of a benefit agent that softens the skin and keeps it soft by retarding the decrease of
its water content and/or protects the skin;
(e) 1.0% to 10% by wt. cationic polymer having a molecular weight of from 1000 to 2,000,000
wherein the amount of insoluble structurant (c) and soap; if any, exceeds amount of hydrophilic structurant (b) by no more than 10% by wt. of total bar composition; and wherein the amount of cationic polymer (e) is such that ratio of cationic polymer to surfactant is 0.06:1 to 1:1; .and wherein charge density of cationic polymer is greater than 0.007; and wherein the ratio of hydrophilic to hydrophobic structurant is at least 1:2.
2. A bar composition as claimed in claim 1, wherein surfactant is an anionic surfactant.
3. A bar composition as claimed in claim 2, wherein surfactant is acyl isothionate or alkali metal alkyl ether sulfate.
4. A bar composition as claimed in any of the preceding claims consisting of 15 to 40% by wt. of said synthetic non-soap surfactant.

5. A bar composition as claimed in any one of the preceding claims consisting of 15 to 35% by wt. of said hydrophilic structurant.
6. A bar composition as claimed in any of the preceding claims wherein the said hydrophilic structurant is at least 10% water soluble at room temperature.
7. A bar composition as claimed in any of the preceding claims wherein the said hydrophilic structurant is selected from polyalkylene oxides, having MW 1500 to 20,000 and block copolymers of polyethylene and polypropylene oxide, and mixtures thereof.
8. A bar composition as claimed in any of the preceding claims wherein the said insoluble structurant is Ci2 to C24 fattty acid.
9. A bar composition as claimed in any of the preceding claims wherein the said benefit agent consist of 5 to 20% by wt. of a water insoluble structurant of the composition.
10. A bar composition as claimed in any of the preceding claims consisting of 1.0% to 7% cationic polymer.
11. A bar composition as claimed in any of the preceding claims wherein the ratio of cationic to structurant is in the region 0.08:1 to 0.5 to 1.

Dated this 20th day of February 2001 J^JOMShJU
Dr.Sanchita Gatiguli of S. Majumdar & Co. Applicant"s Agent





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in-pct-2001-00187-mum-form 2(granted)-(27-08-2004).pdf

in-pct-2001-00187-mum-form 2(granted)-(27-8-2004).doc

in-pct-2001-00187-mum-form 3(20-02-2001).pdf

in-pct-2001-00187-mum-form 5(20-02-2001).pdf



in-pct-2001-00187-mum-petition under rule 138(09-09-2004).pdf

in-pct-2001-00187-mum-power of attorney(27-08-2004).pdf

Patent Number 213404
Indian Patent Application Number IN/PCT/2001/00187/MUM
PG Journal Number 04/2008
Publication Date 25-Jan-2008
Grant Date 01-Jan-2008
Date of Filing 20-Feb-2001
# Inventor's Name Inventor's Address
PCT International Classification Number C11D 17/00
PCT International Application Number PCT/EP99/05826
PCT International Filing date 1999-08-10
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 09/140,312 1998-08-26 U.S.A.
2 09/224,786 1999-01-04 U.S.A.