Title of Invention	NON-TOXIC AIR FRESHENING COMPOSITION, PROCESS FOR PRODUCING THE SAME AND A WICK-CONTAINING AIR FRESHENING DEVICE USING THE COMPOSITION
Abstract	Described is a single phase aqueous surfactant-free nontoxic air freshening composition containing 30-70% water, 5-20% of a fragrance, at least 60% of the components of which las a C log10P < 2.5 and 30-60 weight percent of a mixture of two glycol ether components: (i) dipropylene glycol methyl ether; and (ii) propylene glycol propyl ether or propylene glycol butyl ether. Also described is an air freshener device comprising a vessel for the aforementioned composition, an emanating surface and a wick for supplying the composition to the emanating surface.

Title of Invention

NON-TOXIC AIR FRESHENING COMPOSITION, PROCESS FOR PRODUCING THE SAME AND A WICK-CONTAINING AIR FRESHENING DEVICE USING THE COMPOSITION

Abstract

Described is a single phase aqueous surfactant-free nontoxic air freshening composition containing 30-70% water, 5-20% of a fragrance, at least 60% of the components of which las a C log10P < 2.5 and 30-60 weight percent of a mixture of two glycol ether components: (i) dipropylene glycol methyl ether; and (ii) propylene glycol propyl ether or propylene glycol butyl ether. Also described is an air freshener device comprising a vessel for the aforementioned composition, an emanating surface and a wick for supplying the composition to the emanating surface.

Full Text	OF THE INVENTION Our invention relates to single phase aqueous surfactant-free nontoxic air freshening compositions land wick-containing air freshening devices using such compositions. Conventional liquid air fresheners generally comprise a reservoir containing a mixture which may be a true solution, a colloidal solution or a microemulsion of a perfume with a solvent into which dips a wick which is connected to an emanating surface. The perfume mixture travels up the wick to the emanating surface from which the perfume evaporates and freshens the surrounding atmosphere. Perfumes used in those air fresheners are generally oils and are therefore generally insoluble in water in the absence of any other agents. Systems in which the perfume solution is aqueous based therefore always contain 4 surface active agent which solubilizes the perfume in water. i The amount of surfactant has to be quite high, for instance, 10-15% or more by weight based on the total composition. The surfactants used in such compositions are conventional surfactants, generally anionic surfactants such as alkyl benzene sulfonates and lauryl sulfates. Nonionic surfactants have also been used, but they are more expensive and tend to depress the perception of the perfume odor. These surface active agents are all nonvolatile, and they therefore do not evaporate from the emanating surface. The concentration of surfactant in the emanating surface therefore gradually increases, and the presence of surfactant impedes the progress of performe in the wick and also prevents the perfume emanating as it should. Most aqueous based systems also contain a cosolvent in addition to the perfume and surfactant. Examples of cosolvents are ethanol and diethylene glycol monoethyl ethers (DEGMEE). Such compositions always contain a surfactant and therefore suffer the same disadvantages as described above. Some liquid air fresheners contain little or no water and so are free of surfactant. For example, a solution of perfume in DEGMEE having the structure:and water is stable as a single phase provided the amount of water is low, for example, below 20% when the amount of perfume is about 10% by weight. Since these compositions cannot tolerate high amounts of water, they tend to be expensive. U.S. Letters Patent! No. 3,945,950 (incorporated by reference herein) describes solid air freshener campositions, which suffer from different problems to the air fresheners comprising liquid compositions with which our invention is concerned. The solid compositions contain perfume, a diethylene glycol monoalkyl ether and a gelling agent, which is a surface active fatty acid soap or metal salt thereof and an inert liquid. Water is sometimes included in the compositions as some or all of the inert liquid, but only in small amounts of 4% by weight. In U.S. Letters Patent No. 4,663,081 issued on May 5, 1987 (the specification for which is incorporated % reference herein), it is indicated that diethylene glycol monobutyl ether (DEGMBE) having the structure: can, when containing dissolved perfume, incorporate a surprisingly large amount of water compared to other glycol ethers and is therefore more cost effective. It is further indicated in U.S. Letters Patent No. 4,663,081 that the mixture of DEGMBE and water also has very suitable volatility properties and has a beneficial effect on the rate of emanation of the perfume. It is further indicated in U.S. Letters Patent No. 4,663,081 that the composition containing the DEGMBE generally comprises between 5 and 30% by weight of perfume; usually between 8 and 20% by weight of perfume and often 10% by weight. It is further indicated in U.S. Letters Patent No. 4,663,081 that the amounts of perfume in compositions containing DEGMBE affect the amount of water that can be mixed into the solution before a phase separation occurs. It is stated that, for example, when the concentration of perfume in the solution is 10% by weight then the maximum amount of water that can be incorporated in a one phase solution is about 55% by weight, and for a perfume solution at 20% concentration, the maximum amount of water is about 40% by weight. It is further indicated in U.S. Letters Patent No. 4,663,081 that the perfume may be any of the perfumes conventionally used in air fresheners and that "the identity of the perfume makes little difference to the behavior of the solvent system. It is further indicated in U.S. Letters Patent No. 4,663,081: "Solutions of perfume in various glycoi ethers of varying concentration were loaded with water until phase separation occurred. The maximum amounts of water tolerated in systems at various perfume concentrations for the glycoi ethers tested is shown in Table 1. TABLE 1 Maximum amount of water that can be incorporated into the perfume/glycol ether mixtures, before phase separation. (Table Removed) As can be seen from the table DEGMBE can tolerate a far larger amount of water at a specified perfume concentration than any of the other glycol ethers." For the purposes of the foregoing table and for use throughout the instant application, the following terms are defined: DEGMEE: the compound having the structure: (Figure Removed) DEGDME: the compound having the structure: (Figure Removed) TPGMME: the compound having the structure: (Figure Removed) PGMPE: the compound having the structure: (Figure Removed) PGMME: the compound having the structure: (Figure Removed) DPGMME: the compound having the structure: (Figure Removed) PGMBE: the compound having the structure: (Figure Removed) DEGMBE: the compound having the structure: (Figure Removed) PGMEE: the compound having the structure: (Figure Removed) It is set forth at column 4, lines 15-17 of U.S. Letters Patent No. 4,663,081: "As can be seen from the table DEGMBE can tolerate a far larger amount of water at a specified perfume concentration than any of the other glycol ethers." In view of toxicity problems associated with DEGMBE having the structure: (Figure Removed) it has become apparent that a substitute for the system set forth in U.S. Letters Patent No. 4,663,081 is needed. It is an object of our invention to provide such substitution means. PCT Application No. 97/45516 published on December 4, 1997 discloses and claims a phase-stable liquid refreshment and cleaning composition comprising: (a) butoxy propoxy propanol; or other alkoxylated alkoxy propanol solvent (defined according to one of the structures: (Figure Removed) (b) water; (c) optionally, a minor amount of nonionic surfactant; and (d) an effective, phase stabilizing amount of a member selected from the group consisting of alkyl sulfate surfactant, alkyl ethoxy suifate surfactant and mixtures thereof. However, the PCT Application No. 97/45516 does not teach the problems solved by our invention. THE INVENTION Our invention is directed to a single phase aqueous surface-active agent-free air freshening composition characterized in that it is (a) nontoxic; (b) nonmutagenic; and (c) environmentally friendly, consisting essentially of: (i) 30-70 weight percent water; (ii) 5-20 weight percent of a fragrance composition wherein at least 60% of its composition coifsists of one or more substances having a C log10P (iii) 30-60 weight percent of a mixture of two glycol ether compounds, one of which is dipropylene glycol monomethyl ether having the structure: (Figure Removed) and the other of which is a compound defined according to the structure: (Figure Removed) wherein R is n-propyl or n-butyl. The present invention also relates to a process for producing a synergistic single phase aqueous surface active agent-free air freshening composition characterized in that it is (a) nontoxic; (b) nonomutagenic; and (c) environmentally friendly, said process comprising mixing essentially the following ingredients: (i) 30-70 weight percent water; (ii) 5-20 weight percent of a fragrance composition wherein at least 60% of its composition consists of one or more substances having a C log10 (iii) 3O-60 weight percent of a mixture of two glycol ether compounds, one of which is the dipropylene glycol monomethyl ether having the structure; (Figure Removed) and the other of which is a compound defined according to the structure: wherein R is n-propyl or n-butyl ([PnR]) and wherein the range of weight ratio of dipropylene glycol monomethyl ether: [PnR] is from about 1:1 up to about 5:1 The composition of the present invention is a synergistic composition comprising unexpected or surprising properties. The n-octanol/water partitioning coefficient of a perfume material indicated by the term "P" is the ratio between its equilibrium concentrations in n-octanol and in water. The perfume materials used in our invention have an n-octanol/water partitioning coefficieat "P" of between about 1 and about 10 ' with at least 60% of the perfume components having a partitioning coefficient of between about 1 and about 10 ' . Since the partitioning coefficients of the perfume compositions of this invention have values of between about 1 and about 107.5' , they are more conveniently given in the form of their logarithm to the base 10, logloP. Thus, the perfume materials useful in the practice of our invention have a log10P of between about 1 and about 7.5 as indicated, supra, wherein 60% of the components of the perfume composition have a log10P of between about 1 and about 2.5 as indicated, supra. The log10P of many perfume ingredients have been reported; for example, the Pomona 92 database, available from Daylight Chemical Information Systems, Inc. (Daylight CIS), Irvine, California, contains many, along with citations to the original literature. However, the log10P values are most conveniently calculated by the "CLOGP" program, also available from Daylight CIS. This program also lists experimental log10P values when they are available in the Pomona 92 database. The "calculated log10P" is determined by the fragment approach of Hansch and Leo (Comprehensive Medicinal Chemistry, Volume 4, C. Hansch, P.O. Sammens, J.B. Taylor and C.A. Ramsden, Editors, page 295, Pergamon Press, 1990, incorporated by reference herein). The fragment approach is based on the chemical structure of each component of the perfume material and takes into account the numbers and types of atoms, the atom connectivity and chemical bonding. The calculated log10P values, which are the most reliable and widely used estimates for this physicochemical property, are preferably used instead of the experimental log10P values in the selection of perfume materials useful in the practice of our invention. More specifically, the perfume materials useful in the practice of our invention having a C log10P (Table Removed) For the purposes of our invention, the compounds defined according to the structure: (Figure Removed) wherein R is n-propyl or 4-butyl, are shown by the symbol: [PnR]. The range of weight ratios of the dipropylene glycol monomethyl ether having the structure: (Figure Removed) varies from about 1:1 up to about 5:1. The following example illustrates the invention, but the invention is only limited by the claims. EXAMPLE I The following fragrance is prepared: (Table Removed) At the level of 10%, the resulting fragrance is admixed with the following materials: EXAMPLE I( A) (a) 15 parts by weight of propylene glycol butyl ether having the structure: (Figure Removed) (b) 37.5 parts by weight of dipropylene glycol methyl ether having the structure: (Figure Removed) (c) 37.5 parts by weight of water thereby forming a clear, single phase mixture. EXAMPLE KB) (a) 10 parts by weight of propylene glycol butyl ether; (b) 30 parts by weight of dipropylene glycol methyl ether; and (c) 50 parts by weight of water thereby forming a clear, single phase mixture. EXAMPLE I(C) (a) 12.5 parts by weight of propylene glycol butyl ether; (b) 35 parts by weight of dipropylene glycol methyl ether; and (c) 42.5 parts by weight of water thereby forming a clear, single phase mixture. EXAMPLE I(P) (a) 10 parts by weight of propylene glycol butyl ether; (b) 35 parts by weight of dipropylene glycol methyl ether; and (c) 45 parts by weight of water thereby forming a clear, single phase mixture. EXAMPLE I(E) (a) 10 parts by weight of propylene glycol butyl ether; (b) 45 parts by weight of dipropylene glycol methyl ether; and (c) 35 parts by weight of water thereby forming a clear, single phase mixture. EXAMPLE I(F) (a) 15 parts by weight of propylene glycol butyl ether; (b) 42.5 parts by weight of dipropylene glycol methyl ether; and (c) 32.5 parts by weight of water thereby forming a clear, single phase mixture. EXAMPLE KG) (a) 10 parts by weight of propylene glycol butyl ether; (b) 30 parts by weight of dipropylene glycol methyl ether; and f c) 50 parts by weight of water thereby forming a clear, single phase mixture. EXAMPLE I(H) (a) 15 parts by weight of propylene glycol butyl ether; (b) 10 parts by weight of dipropylene glycolpropyl ether having the structure: (Figure Removed) (c) 65 parts by weight of water thereby forming a clear, single phase mixture. EXAMPLE (a) 25 parts by weight of propylene glycol methyl ether; (b) 20 parts by weight of dipropylene glycol n-propyl ether; and (c) 45 parts by weight of water thereby forming a clear, single phase mixture. EXAMPLE I (J) (a) 20 parts by weight of propylene glycol methyl ether; (b) 15 parts by weight of dipropylene glycol n-propyl ether; and (c) 55 parts by weight of water thereby forming a clear, single phase mixture. EXAMPLE I (K) (a) 10 parts by weight of propylene glycol n-butyl ether; (b) 35 parts by weight of dipropylene glycol methyl ether; and (c) 45 parts by weight of water thereby forming a clear, single phase mixture. EXAMPLE (L) (a) 10 parts by weight of propylene glycol n-butyl ether; (b) 40 parts by weight of dipropylene glycol methyl ether; and (c) 40 parts by weight of water thereby forming a clear, single phase mixture. EXAMPLE KM) (a) 10 parts by weight of propylene glycol butyl ether; (b) 40 parts by weight of dipropylene glycol methyl ether; and (c) 40 parts by weight of water thereby forming a clear, single phase mixture. EXAMPLE I(N) (a) 10 parts by Weight of propylene glycol butyl ether; (b) 35 parts by weight of dipropylene glycol methyl ether; and (c) 45 parts by weight of water thereby forming a clear, single phase mixture. EXAMPLE I(O) (a) 17.5 parts by weight of propylene glycol butyl ether; (b) 37.5 parts by weight of dipropylene glycol methyl ether; and (c) 35 parts by weight of water thereby forming a clear, single phase mixture. Each of the foregoing mixtures of Examples I(A)-I(0) is separately admixed with the following ingredients: (Table Removed) Each of the resulting mixtures is used in an IFF prototype nonelectic wick air freshener. In all cases, at steady state, the period of exhaustion of the wick was greater than 45 days. The following table sets forth the periods of exhaustion and perfume emanated as a percent of original for each example: (Table Removed) In general, the systems of our invention show a vast improvement over the systems of the prior art; with the additional features that the systems of our invention are nontoxic, nonmutagenic and are environmentally friendly. The air freshener devices that may be used in the instant case are those devices set forth in U.S. Letters Patent No. 4,663,081 issued on May 5, 1987, the specification for which is incorporated by reference herein. WE CLAIM: 1. A synergistic single phase aqueous surface active agent-free, nontoxic, nonmutagenic and environmental friendly air freshening composition, consisting essentially of: (i) 30-70 weight percent water; (ii) 5-20 weight percent of a fragrance composition wherein at least 60% of its composition consists of one or more substances having a C logioP C log10P in the range of 2.5 and the other of which is a compound defined according to the structure: (iii) 30-60 weight percent of a mixture of glycol ether compounds, one of which is the dipropylene glycol monomethyl ether having the structure: (Figure Removed) wherein R is n-propyl or n-butyl ( [PnR ]) and wherein the range of weight ratio of dipropylene glycol monomethyl ether: [PnR] is from about 1:1 up to about 5:1. 2. A process for producing a synergistic single phase aqueous surface active agent-free, nontoxic, nonmutagenic and environmental friendly air freshening composition as claimed in claim 1, said process comprising mixing essentially the following ingredients: 30-70 weight percent water; 5-20 weight percent of a fragrance composition wherein at least 60% of its composition consists of one or more substances having a C log10P C log10P in the range of 2.5 30-60 weight percent of a mixture of glycol ether compounds, one of which is the dipropylene glycol monomethyl ether having the structure; (Figure Removed) and the other of which is a compound defined according to the structure: (Figure Removed) wherein R is n-propyl or n-butyl ( [PnR ]) and wherein the range of weight ratio of dipropylene glycol monomethyl ether: [PnR] is from about 1:1 up to about 5:1. 3. An air freshener comprising a container for a perfume solution, an emanating surface and a wick for supplying a perfume solution to the emanating surface, characterized in that the solution is a composition as claimed in claim 1. 4. An air freshener as claimed in claim3 in which the emanating surface and the wick are formed by folding an integral strip of a cellulosic material. 5. An air freshener as claimed in claim 4 in which the cellulosic material is paper. 6. A synergistic single phase aqueous surface active agent-free air freshening composition and a process for preparing the same substantially as herein described with reference to the foregoing examples. 7. An air freshener comprising a container for a perfume solution substantially as herein described with reference to the foregoing examples.

Full Text

OF THE INVENTION
Our invention relates to single phase aqueous surfactant-free nontoxic air

freshening compositions land wick-containing air freshening devices using such compositions.
Conventional liquid air fresheners generally comprise a reservoir containing a

mixture which may be a true solution, a colloidal solution or a microemulsion of a perfume with a solvent into which dips a wick which is connected to an emanating
surface. The perfume mixture travels up the wick to the emanating surface from which
the perfume evaporates and freshens the surrounding atmosphere. Perfumes used in
those air fresheners are generally oils and are therefore generally insoluble in water in the absence of any other agents. Systems in which the perfume solution is aqueous based
therefore always contain 4 surface active agent which solubilizes the perfume in water.
i
The amount of surfactant has to be quite high, for instance, 10-15% or more by weight
based on the total composition.
The surfactants used in such compositions are conventional surfactants, generally anionic surfactants such as alkyl benzene sulfonates and lauryl sulfates. Nonionic surfactants have also been used, but they are more expensive and tend to depress the perception of the perfume odor. These surface active agents are all nonvolatile, and they therefore do not evaporate from the emanating surface. The concentration of surfactant in the emanating surface therefore gradually increases, and the presence of surfactant impedes the progress of performe in the wick and also prevents the perfume emanating as it should.
Most aqueous based systems also contain a cosolvent in addition to the perfume and surfactant. Examples of cosolvents are ethanol and diethylene glycol monoethyl

ethers (DEGMEE). Such compositions always contain a surfactant and therefore suffer the same disadvantages as described above.
Some liquid air fresheners contain little or no water and so are free of surfactant. For example, a solution of perfume in DEGMEE having the structure:and water is stable as a single phase provided the amount of water is low, for example, below 20% when the amount of perfume is about 10% by weight. Since these compositions cannot tolerate high amounts of water, they tend to be expensive.
U.S. Letters Patent! No. 3,945,950 (incorporated by reference herein) describes solid air freshener campositions, which suffer from different problems to the air fresheners comprising liquid compositions with which our invention is concerned. The solid compositions contain perfume, a diethylene glycol monoalkyl ether and a gelling agent, which is a surface active fatty acid soap or metal salt thereof and an inert liquid. Water is sometimes included in the compositions as some or all of the inert liquid, but only in small amounts of 4% by weight.
In U.S. Letters Patent No. 4,663,081 issued on May 5, 1987 (the specification for which is incorporated % reference herein), it is indicated that diethylene glycol monobutyl ether (DEGMBE) having the structure:
can, when containing dissolved perfume, incorporate a surprisingly large amount of water compared to other glycol ethers and is therefore more cost effective. It is further indicated in U.S. Letters Patent No. 4,663,081 that the mixture of DEGMBE and water also has very suitable volatility properties and has a beneficial effect on the rate of emanation of the perfume. It is further indicated in U.S. Letters Patent No. 4,663,081 that the composition containing the DEGMBE generally comprises between 5 and 30% by weight of perfume; usually between 8 and 20% by weight of perfume and often 10% by weight. It is further indicated in U.S. Letters Patent No. 4,663,081 that the amounts of perfume in compositions containing DEGMBE affect the amount of water that can be mixed into the solution before a phase separation occurs. It is stated that, for example, when the concentration of perfume in the solution is 10% by weight then the maximum amount of water that can be incorporated in a one phase solution is about 55% by weight, and for a perfume solution at 20% concentration, the maximum amount of water is about 40% by weight.
It is further indicated in U.S. Letters Patent No. 4,663,081 that the perfume may be any of the perfumes conventionally used in air fresheners and that "the identity of the perfume makes little difference to the behavior of the solvent system. It is further indicated in U.S. Letters Patent No. 4,663,081:
"Solutions of perfume in various glycoi ethers of varying concentration were loaded with water until phase separation occurred. The maximum amounts of water tolerated in systems at various perfume concentrations for the glycoi ethers tested is shown in Table 1.
TABLE 1
Maximum amount of water that can be incorporated into the perfume/glycol ether
mixtures, before phase separation.
(Table Removed)
As can be seen from the table DEGMBE can tolerate a far larger amount of water at a specified perfume concentration than any of the other glycol ethers."
For the purposes of the foregoing table and for use throughout the instant application, the following terms are defined:
DEGMEE: the compound having the structure:
(Figure Removed)
DEGDME: the compound having the structure: (Figure Removed)
TPGMME: the compound having the structure: (Figure Removed)

PGMPE: the compound having the structure: (Figure Removed)
PGMME: the compound having the structure: (Figure Removed)
DPGMME: the compound having the structure: (Figure Removed)
PGMBE: the compound having the structure: (Figure Removed)
DEGMBE: the compound having the structure: (Figure Removed)
PGMEE: the compound having the structure: (Figure Removed)
It is set forth at column 4, lines 15-17 of U.S. Letters Patent No. 4,663,081:
"As can be seen from the table DEGMBE can tolerate a far larger amount of water at a specified perfume concentration than any of the other glycol ethers."
In view of toxicity problems associated with DEGMBE having the structure:
(Figure Removed)
it has become apparent that a substitute for the system set forth in U.S. Letters Patent No. 4,663,081 is needed.
It is an object of our invention to provide such substitution means.
PCT Application No. 97/45516 published on December 4, 1997 discloses and claims a phase-stable liquid refreshment and cleaning composition comprising:
(a) butoxy propoxy propanol; or other alkoxylated alkoxy propanol solvent
(defined according to one of the structures: (Figure Removed)
(b) water;
(c) optionally, a minor amount of nonionic surfactant; and
(d) an effective, phase stabilizing amount of a member selected from the group
consisting of alkyl sulfate surfactant, alkyl ethoxy suifate surfactant and
mixtures thereof.
However, the PCT Application No. 97/45516 does not teach the problems solved by our invention.
THE INVENTION
Our invention is directed to a single phase aqueous surface-active agent-free air freshening composition characterized in that it is (a) nontoxic; (b) nonmutagenic; and (c) environmentally friendly, consisting essentially of:
(i) 30-70 weight percent water;
(ii) 5-20 weight percent of a fragrance composition wherein at least 60% of its composition coifsists of one or more substances having a C log10P (iii) 30-60 weight percent of a mixture of two glycol ether compounds, one of which is dipropylene glycol monomethyl ether having the structure:
(Figure Removed) and the other of which is a compound defined according to the structure:
(Figure Removed)
wherein R is n-propyl or n-butyl.
The present invention also relates to a process for producing a synergistic single phase aqueous surface active agent-free air freshening composition characterized in that it is (a) nontoxic; (b) nonomutagenic; and (c) environmentally friendly, said process comprising mixing essentially the following ingredients:
(i) 30-70 weight percent water;
(ii) 5-20 weight percent of a fragrance composition wherein at least 60% of its composition consists of one or more substances having a
C log10 (iii) 3O-60 weight percent of a mixture of two glycol ether compounds, one of which is the dipropylene glycol monomethyl ether having the structure;
(Figure Removed)
and the other of which is a compound defined according to the structure:
wherein R is n-propyl or n-butyl ([PnR]) and wherein the range of
weight ratio of dipropylene glycol monomethyl ether: [PnR] is from about 1:1 up to about 5:1
The composition of the present invention is a synergistic composition comprising
unexpected or surprising properties.
The n-octanol/water partitioning coefficient of a perfume material indicated by the term "P" is the ratio between its equilibrium concentrations in n-octanol and in water. The perfume materials used in our invention have an n-octanol/water partitioning
coefficieat "P" of between about 1 and about 10 ' with at least 60% of the perfume
components having a partitioning coefficient of between about 1 and about 10 ' . Since the partitioning coefficients of the perfume compositions of this invention have values of between about 1 and about 107.5' , they are more conveniently given in the form of their logarithm to the base 10, logloP. Thus, the perfume materials useful in the practice of our invention have a log10P of between about 1 and about 7.5 as indicated, supra,
wherein 60% of the components of the perfume composition have a log10P of between about 1 and about 2.5 as indicated, supra.
The log10P of many perfume ingredients have been reported; for example, the
Pomona 92 database, available from Daylight Chemical Information Systems, Inc. (Daylight CIS), Irvine, California, contains many, along with citations to the original
literature. However, the log10P values are most conveniently calculated by the "CLOGP" program, also available from Daylight CIS. This program also lists experimental log10P values when they are available in the Pomona 92 database. The
"calculated log10P" is determined by the fragment approach of Hansch and Leo
(Comprehensive Medicinal Chemistry, Volume 4, C. Hansch, P.O. Sammens, J.B. Taylor and C.A. Ramsden, Editors, page 295, Pergamon Press, 1990, incorporated by reference herein). The fragment approach is based on the chemical structure of each component of the perfume material and takes into account the numbers and types of atoms, the atom
connectivity and chemical bonding. The calculated log10P values, which are the most reliable and widely used estimates for this physicochemical property, are preferably used instead of the experimental log10P values in the selection of perfume materials useful in the practice of our invention.
More specifically, the perfume materials useful in the practice of our invention having a C log10P
(Table Removed)
For the purposes of our invention, the compounds defined according to the structure:
(Figure Removed)
wherein R is n-propyl or 4-butyl, are shown by the symbol: [PnR].
The range of weight ratios of the dipropylene glycol monomethyl ether having the structure: (Figure Removed)
varies from about 1:1 up to about 5:1.
The following example illustrates the invention, but the invention is only limited by the claims.
EXAMPLE I
The following fragrance is prepared:

(Table Removed)
At the level of 10%, the resulting fragrance is admixed with the following materials:
EXAMPLE I( A)
(a) 15 parts by weight of propylene glycol butyl ether having the structure:
(Figure Removed)
(b) 37.5 parts by weight of dipropylene glycol methyl ether having the structure:
(Figure Removed)
(c) 37.5 parts by weight of water thereby forming a clear, single phase mixture.
EXAMPLE KB)
(a) 10 parts by weight of propylene glycol butyl ether;
(b) 30 parts by weight of dipropylene glycol methyl ether; and
(c) 50 parts by weight of water
thereby forming a clear, single phase mixture.
EXAMPLE I(C)
(a) 12.5 parts by weight of propylene glycol butyl ether;
(b) 35 parts by weight of dipropylene glycol methyl ether; and
(c) 42.5 parts by weight of water
thereby forming a clear, single phase mixture.
EXAMPLE I(P)
(a) 10 parts by weight of propylene glycol butyl ether;
(b) 35 parts by weight of dipropylene glycol methyl ether; and
(c) 45 parts by weight of water
thereby forming a clear, single phase mixture.
EXAMPLE I(E)
(a) 10 parts by weight of propylene glycol butyl ether;
(b) 45 parts by weight of dipropylene glycol methyl ether; and
(c) 35 parts by weight of water
thereby forming a clear, single phase mixture.
EXAMPLE I(F)
(a) 15 parts by weight of propylene glycol butyl ether;
(b) 42.5 parts by weight of dipropylene glycol methyl ether; and
(c) 32.5 parts by weight of water
thereby forming a clear, single phase mixture.
EXAMPLE KG)
(a) 10 parts by weight of propylene glycol butyl ether;
(b) 30 parts by weight of dipropylene glycol methyl ether; and
f c) 50 parts by weight of water
thereby forming a clear, single phase mixture.
EXAMPLE I(H)
(a) 15 parts by weight of propylene glycol butyl ether;
(b) 10 parts by weight of dipropylene glycolpropyl ether having the structure:
(Figure Removed)
(c) 65 parts by weight of water
thereby forming a clear, single phase mixture.
EXAMPLE
(a) 25 parts by weight of propylene glycol methyl ether;
(b) 20 parts by weight of dipropylene glycol n-propyl ether; and
(c) 45 parts by weight of water
thereby forming a clear, single phase mixture.
EXAMPLE I (J)
(a) 20 parts by weight of propylene glycol methyl ether;
(b) 15 parts by weight of dipropylene glycol n-propyl ether; and
(c) 55 parts by weight of water
thereby forming a clear, single phase mixture.
EXAMPLE I (K)
(a) 10 parts by weight of propylene glycol n-butyl ether;
(b) 35 parts by weight of dipropylene glycol methyl ether; and
(c) 45 parts by weight of water
thereby forming a clear, single phase mixture.
EXAMPLE (L)
(a) 10 parts by weight of propylene glycol n-butyl ether;
(b) 40 parts by weight of dipropylene glycol methyl ether; and
(c) 40 parts by weight of water
thereby forming a clear, single phase mixture.
EXAMPLE KM)
(a) 10 parts by weight of propylene glycol butyl ether;
(b) 40 parts by weight of dipropylene glycol methyl ether; and
(c) 40 parts by weight of water
thereby forming a clear, single phase mixture.
EXAMPLE I(N)
(a) 10 parts by Weight of propylene glycol butyl ether;
(b) 35 parts by weight of dipropylene glycol methyl ether; and
(c) 45 parts by weight of water
thereby forming a clear, single phase mixture.
EXAMPLE I(O)
(a) 17.5 parts by weight of propylene glycol butyl ether;
(b) 37.5 parts by weight of dipropylene glycol methyl ether; and
(c) 35 parts by weight of water
thereby forming a clear, single phase mixture.
Each of the foregoing mixtures of Examples I(A)-I(0) is separately admixed with the following ingredients:

(Table Removed)
Each of the resulting mixtures is used in an IFF prototype nonelectic wick air freshener. In all cases, at steady state, the period of exhaustion of the wick was greater than 45 days. The following table sets forth the periods of exhaustion and perfume emanated as a percent of original for each example:

(Table Removed)
In general, the systems of our invention show a vast improvement over the systems of the prior art; with the additional features that the systems of our invention are nontoxic, nonmutagenic and are environmentally friendly. The air freshener devices that may be used in the instant case are those devices set forth in U.S. Letters Patent No. 4,663,081 issued on May 5, 1987, the specification for which is incorporated by reference herein.

WE CLAIM:
1. A synergistic single phase aqueous surface active agent-free, nontoxic,
nonmutagenic and environmental friendly air freshening composition, consisting
essentially of:
(i) 30-70 weight percent water;
(ii) 5-20 weight percent of a fragrance composition wherein at least 60% of its
composition consists of one or more substances having a C logioP C log10P in the range of 2.5 and the other of which is a compound defined according to the structure:
(iii) 30-60 weight percent of a mixture of glycol ether compounds, one of which is the dipropylene glycol monomethyl ether having the structure:

(Figure Removed)
wherein R is n-propyl or n-butyl ( [PnR ]) and wherein the range of weight ratio of
dipropylene glycol monomethyl ether: [PnR] is from about 1:1 up to about 5:1.
2. A process for producing a synergistic single phase aqueous surface active agent-free, nontoxic, nonmutagenic and environmental friendly air freshening composition as claimed in claim 1, said process comprising mixing essentially the following ingredients:
30-70 weight percent water;
5-20 weight percent of a fragrance composition wherein at least 60% of its
composition consists of one or more substances having a C log10P C log10P in the range of 2.5 30-60 weight percent of a mixture of glycol ether compounds, one of which is the dipropylene glycol monomethyl ether having the structure;
(Figure Removed)
and the other of which is a compound defined according to the structure:
(Figure Removed)
wherein R is n-propyl or n-butyl ( [PnR ]) and wherein the range of weight
ratio of dipropylene glycol monomethyl ether: [PnR] is from about 1:1 up to about 5:1.
3. An air freshener comprising a container for a perfume solution, an emanating
surface and a wick for supplying a perfume solution to the emanating surface,
characterized in that the solution is a composition as claimed in claim 1.
4. An air freshener as claimed in claim3 in which the emanating surface and the
wick are formed by folding an integral strip of a cellulosic material.
5. An air freshener as claimed in claim 4 in which the cellulosic material is paper.
6. A synergistic single phase aqueous surface active agent-free air freshening composition and a process for preparing the same substantially as herein described with reference to the foregoing examples.
7. An air freshener comprising a container for a perfume solution substantially as herein described with reference to the foregoing examples.

Documents:

672-del-2000-abstract.pdf

672-del-2000-claims.pdf

672-del-2000-correspondence-others.pdf

672-del-2000-correspondence-po.pdf

672-del-2000-description (complete).pdf

672-del-2000-form-1.pdf

672-del-2000-form-13.pdf

672-del-2000-form-19.pdf

672-del-2000-form-2.pdf

672-del-2000-form-26.pdf

672-del-2000-form-3.pdf

672-del-2000-form-5.pdf

672-del-2000-petition-138.pdf

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Patent Number

218305

Indian Patent Application Number

0672/DEL/2000

PG Journal Number

24/2008

Publication Date

13-Jun-2008

Grant Date

31-Mar-2008

Date of Filing

20-Jul-2000

Name of Patentee

INTERNATIONAL FLAVORS & FRAGRANCES INC

Applicant Address

521 WEST 57TH STREET, NEW YTORK, N.Y. 10019, USA

Inventors:

#	Inventor's Name	Inventor's Address
1	ARNOUD VAN WALSUM	KLARINETSINGEL 166, 3335 DE ZWYNDRECHT, PROVINCE OF ZUID HOLLAND, THE KINGDOM OF NETHERLANDS
2	JAN-WILLEM ZACHARIAS RUIZENDAAL	V. DOMPSELAERSTRAAT 13, 3772 AC BARNEVELD, PROVINCE OF GELDERLAND, THE KINGDOM OF THE NETHERLANDS
3	RICHARD MARK BODEN	30, SEWARD DRIVE, OCEAN, COUNTY OF MONMOUTH, STATE OF NEW JERSEY 07712, USA
4	MICHAEL JOHN ROBERT WHITE	RAPENBURG

PCT International Classification Number

A61L 9/01

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	09/383,969	1999-08-26	U.S.A.