MXPA97002039A

MXPA97002039A - Composition of gel to shave, self-assistant, without ja

Info

Publication number: MXPA97002039A
Application number: MXPA/A/1997/002039A
Authority: MX
Inventors: C George Robert
Original assignee: The Gillette Company
Priority date: 1994-09-22
Filing date: 1997-03-18
Publication date: 1997-06-01

Abstract

The present invention relates to a shaving composition in the form of a self-foaming gel, characterized in that it comprises, in percent by weight, about 65 to 85% of water, about 4 to 16% of N-acyl sarcosine wherein the acyl group has 10 to 20 carbon atoms, about 1 to 6% of sufficient organic amine base to solubilize the N-acyl sarcosine and provide a pH of about 4 to about 8, about 1 to 8% self-foaming agent, about 1 to 8% of a surfactant nonionic, and about 1 to 10% non-volatile paraffinic hydrocarbon fluid, the composition is substantially free of soap

Description

COMPOSITION OF GEL TO SHAVE, SELF-SPLASHING, WITHOUT SOAP DESCRIPTION OF THE INVENTION This invention relates to a shaving gel composition, without soap. Such a composition is supplied in the form of a gel containing a volatile component, which causes the gel to become a foam when it is spread on the skin in the wet shaving preparation - i.e., shaving with a razor blade. Gels for post-foaming or self-cleaning shaving are now well known and have been described, for example, in U.S. Patent Nos. 2,995,521 (Bluard), 3,541,581 (Monson), 4,405,489 (Sisbarro), 4,528,111 (Su) , 4,651,503 (Anderson), 5,248,495 (Patterson), 5,308,643 (Osipow) and 5,326,556 (Barnet) and the published PCT application WO 91/07943 (Chaudhuri). Such compositions generally take the form of a water-in-oil emulsion, in which the self-foaming agent, generally a volatile (ie, low-boiling) aliphatic hydrocarbon, is solubilized in the oil phase and the water phase comprises a component of soap soluble in water. The product is generally packaged in an aerosol container with a barrier, such as a piston or REF: 24342 a compressible bag, for separating the self-foaming gel from the propellant required for the expulsion of the product. The product is supplied as a clear, translucent or opaque gel, which is substantially free of foam until it extends over the skin, at which time it produces a soap scum generated by the volatilization of the volatile hydrocarbon spraying agent. Although conventional self-foaming shaving gels have gained wide acceptance by consumers, they can be a bit harsh and dry the skin due to the soap component. To counteract this effect, the typical shaving gel composition is formulated with skin softening components, such as humectants, emollients, silicones, etc. Although the addition of such components substantially improves the aesthetics of the product, repeated use may still produce undesirable drying of the skin, particularly among female users. Accordingly, it is highly desirable to develop a self-foaming shaving gel composition, which is less severe and dries less skin than conventional shaving gels, without sacrificing any of its performance characteristics. N-acyl sarcosinates are well-known anionic surfactants represented by the formula where R is a fatty acid hydrocarbon chain. These materials are typically used in the form of water soluble salts formed by neutralization with sodium, potassium or ammonium hydroxide or triethanolamine and have been suggested for use in a wide variety of products including shampoos, detergents, dentrí fiels, soaps for hands and creams to shave. For example, aerosol shaving creams containing sarcosinates are described in U.S. Patent Nos. 3,959,160 (Horsler), 4,113,643 (Thompson) and 4,140,648 (Thompson) and in Harry's Cosmeticology (7th ed., 1982), p. . 169 (see Croda Cosmetic and Pharmaceutical Formulary Supplement, formula SV11). A non-aerosol, non-soap shaving cream, which may optionally contain a sarcosinate is described in U.S. Patent 4,892,729 (Cavazza) and a non-aerosol shaving gel, which contains both a soap and a sarcosinate is described in U.S. Patent 5,340,571 (Grace). Shaving products without soap are also known, but they must meet with limited acceptance. For example, U.S. Patent Nos. 4,046,874 (Gabby) and 4,761,279 (Khalil) describe shaving cream compositions containing, respectively, a polyglycerol fatty ester (e.g., triglycerol monostearate) and an acid fatty ester. lactyl (for example sodium salt of stearylactyl acid). A polyethylene oxide polymer containing pre-shave gel and a polysulfonic acid polymer are described in U.S. Patent 4, 999.183 (Mackles). The present invention comprises a soap-free, self-foaming shaving gel composition which maintains superior performance attributes while avoiding the severity and drying associated with soap-based shaving preparations. The shaving gel composition of the present invention consists of water, water-soluble N-acyl sarcosinate salt, volatile self-foaming agent and a non-volatile paraffinic hydrocarbon fluid. The essential components of the shaving composition of the present invention include, in percent by weight, from about 65 to 85% water, from about 4 to 16% N-acyl sarcosine, wherein the acyl group has from 10 to 20 carbon atoms, sufficient base to solubilize the N-acyl sarcosine and provide a pH of from about 4 to about 8, from about 1 to about 8% of the self-foaming agent and from about 1 to 10% of non-volatile paraffinic hydrocarbon fluid, the composition which is in the form of a self-foaming gel and which is substantially soap-free. According to the invention, the composition will consist of about 70 to 80% water, about 6 to 12% N-acyl sarcosine, sufficient base to provide a pH of about 5 to 7, about 2 to 5% self-foaming agent and about 1.5 to 7% of the non-volatile paraffinic hydrocarbon fluid. A more preferred shaving composition will also additionally include a nonionic surfactant, a fatty alcohol and a gelling aid and will be substantially free of other anionic surfactants. The N-acyl sarcosine can be selected from any of those, which are commercially available, having an acyl portion with 10 to 20, preferably 12 to 18 carbon atoms and which will provide a water soluble sarcosinate, when neutralized with a appropriate base. These typically include stearoyl sarcosine, myristoyl sarcosine, oleoyl sarcosine, lauroyl sarcosine, cocoyl sarcosine and mixtures thereof. Stearoyl sarcosine and myristoyl sarcosine, as well as mixtures thereof, are preferred. It is also possible to use a pre-neutralized sarcosinate, such as triethanolamine-myristoylous sarcosinate, in which case it will not be necessary to separately add the base to the composition, except for such an amount of acid or base as required to adjust the pH of the final composition. Both of the sarcosine component and the base component can be selected to provide a transparent or translucent gel when combined with the other components of the composition. The base can be selected from any of the organic amine bases, which are typically used to neutralize the N-acyl sarcosines to form water soluble salts. These include, for example, isopropanolamine, mono-, di- and triethanolamine, aminomethylpropanol and aminomethylpropanediol. Triethanolamine is preferred. The amount of base, which is used, will depend on the amount of sarcosine, which is present in the composition. A sufficient amount should be used to solubilize the sarcosine in the aqueous phase of the composition and provide a pH of about 4 to 8, preferably about 5 to 7. To reach this pH range, the sarcosine should be about 50. 90% neutralized, preferably about 60 to 80% neutralized. In this way it is more preferred that there is at least a slight molar excess of sarcosine based. Typically, the base will consist of about 1 to 6% of the composition. The self-foaming agent can be any volatile hydrocarbon or halogenated hydrocarbon with a sufficiently low boiling point, such that it will volatilize and foam the gel by application to the skin, but not too low that causes the gel to foam prematurely. The typical boiling point of such an agent generally falls within the range of 20 to 40 ° C. The preferred self-foaming agents, are selected from saturated aliphatic hydrocarbons having from 4 to 6 carbon atoms, such as n-pentane, isopentane, neopentane, n-butane, isobutane and their mixtures. Most preferred is a mixture of isopentane and isobutane in a weight ratio of about 1: 1 to about 3: 1. The self-foaming agent will normally be present in an amount comprising from about 1 to 8% of the composition, preferably from about 2 to 5%. The shaving composition additionally contains from about 1 to 10%, preferably from about 1.5 to 7%, of a non-volatile paraffinic hydrocarbon fluid, which aids in the gelation of the composition. The terms "non-volatile" and "fluid" mean that these materials are liquid at room temperature and have a boiling point above 200 ° C. Such hydrocarbon fluids include mineral oils and branched-chain aliphatic liquids. These fluids typically have from about 16 to about 48, preferably from about 20 to about 40, carbon atoms and a viscosity from about 5 to about 100 is preferably from about 10 to about 50 is at 40 ° C. The non-volatile, paraffinic hydrocarbon polymer is selected from mineral oil with a viscosity of about 10 to about 50 is at 40 ° C, hydrogenated polyisobutene with a molecular weight of about 320 to about 420 and mixtures thereof. Water is the main component of the composition and sufficient amounts are used to solubilize the surfactant component and form the continuous phase of the emulsion, while providing a stable gel of suitable viscosity with desirable soap scum and rinse properties. It is added in a sufficient quantity (q.s.) to bring the total of all the components to 100%. The amount of water in the composition typically falls within the range of about 65 to 85%, preferably about 70 to 80%. In addition to the essential components described in the foregoing, the shaving composition of the present invention may include a variety of other well-known cosmetic ingredients to improve the aesthetic characteristics and efficacy of the composition. It is generally advantageous to include up to 8%, preferably from about 1 to 6%, of a nonionic surfactant in the composition to improve foam quality, wettability, gel consistency and rinsing ability. Suitable nonionic surfactants will typically have an HLB of 15 or more and must be compatible with the aqueous sarcosinate component. Preferred nonionic surfactants include polyoxyethylene ethers of fatty alcohols, acids and amines, particularly those having from 10 to 20, preferably from 12 to 18 carbon atoms in the fatty portion and from approximately 8 to 60, preferably from 10 to 30. ethylene oxide units. These include, for example, Oleth-20, Steareth-21, Ceteth-20 and Laureth-23. Other nonionic surfactants include polyoxyethylene ethers of alkyl substituted phenols, such as Nonoxynol-4 and Nonoxynol-20, fatty alkanolamides such as Lauramide DEA and Cocamide MEA, sorbitan esters of polyethoxylated fatty acids, such as Polysorbate-20, lauryl polyglucoside, sucrose laurate. and polyglycerol 8-oleate. It may also be advantageous to include a water soluble gelling aid or thickening agent in the shaving composition, to improve the consistency and stability of the gel, as well as to adjust its viscosity. These may include, for example, hydroxyalkylcellulose polymers such as hydroxyethylcellulose and hydroxypropylcellulose (sold under the trademarks "Natrosol" and "Klucel" respectively), copolymers of acrylic acid and polyalkylsucrose (sold under the trademark "Carbopol"), carboxymethylcellulose and cellulose methyl ether (sold under the trademark "Methocel"). Natural or synthetic gums, resins and starch. It can also be used. Preferred thickening agents are hydroxyethylcellulose, hydroxypropylcellulose and mixtures thereof. The gelling aid or thickening agent is typically included in an amount of about 0.01 to 5%, preferably about 0.1 to 2% by weight of the composition. The shaving composition also preferably includes up to 8%, preferably about 2 to 6% by weight of a fatty alcohol, such as iristyl, lauryl and stearyl alcohol and octyldodecanol. The term "fatty" is intended to include from 10 to 20, preferably from 12 to 18 carbon atoms. It is particularly advantageous to include in the composition a cationic conditioning polymer, which is substantial for the skin to improve the lubricity and feel of post-shaved skin. Such polymers can include polymeric quaternary ammonium salts of hydroxyethylcellulose, such as polyquaternium-10 and polyquaternium-24. These polymers are typically included in an amount of about 0.05 to 2%, preferably about 0.1 to 1% by weight.

Other useful additives, which may be used in the composition include humectants such as glycerin, sorbitol and propylene glycol, emollients including fatty esters such as isopropyl myristate, decyl oleate, 2-ethylhexyl palmitate, glyceryl cocoate PEG-7 and glyceryl linoleate, propoxylated fatty esters such as cetyl ether PPG-10 and stearyl ether PPG-11, di- and triglycerides such as lecithin and caprylic / capric triglyceride, vegetable oils and similar materials, skin fresheners and softeners such as menthol, aloe, allantoin, lanolin, collagen and hyaluronic acid, lubricants such as polyethylene oxide, fluorosurfactants and silicones (for example dimethicone, dimethiconol, dimethicone copolyol, stearyldimethicone, cetyldimethicone copolyol, phenyldimethicone, cyclomethicone, etc.), vitamins (including precursors) of vitamin and derivatives) such as panthenol, tocopherol acetate and vit palmitate amine A, dyes, fragrances, antioxidants and preservatives. A preferred shaving composition of the present invention comprises, in percent by weight, from about 65 to 85% water, about 4 to 16% N-acyl sarcosine, wherein the acyl group has from 10 to 20%, preferably 12 to 18 carbon atoms, sufficient organic amine base to solubilize the N-acyl sarcosine and provide a pH from about 4 to about 8, from about 1 to 8% self-foaming agent, from about 1 to 10% paraffinic hydrocarbon fluid not volatile, from about 1 to 8% of a nonionic surfactant, and from about 1 to 8% of a fatty alcohol. More preferably, the composition will consist of about 70 to 80% water, about 6 to 12% N-acyl sarcosine, sufficient base to provide a pH of about 5 to 7, about 2 to 5% self-foaming agent, about 1.5 to 7% non-volatile paraffinic hydrocarbon fluid, about 1 to 6% of a nonionic surfactant, about 2 to 6% of a fatty alcohol, and about 0.1 to 2% of a thickening agent. The shaving composition of the present invention may be packaged in any suitable dispenser to deliver post-foam shaving gels. These include aerosol containers with a barrier, such as a compressible pouch or piston, for separating the gel from the propellant required for ejection, compressible tubes and pump containers or squeezable containers. The following examples illustrate the representative shaving gel compositions of the present invention. All parts and percentages are by weight.

Component? Ex. 1 Ex. 2 Ex. 3 Ex. 4 Ex. 5 Estearoilsarcosina 5,192 3,558 7,500 Miristolsarcosine 1,923 8,000 3,558 7,500 Triethanolamine (99%) 2,596 2,750 2,596 2,750 2,750 Myristyl alcohol 2,692 4,000 2,692 4,000 3,000 Mineral oil. 180/1901 1.923 Mineral oil 65/75 '5,000 1,442 4,500 3,000 Hydrogenated polyisobutene 1,442 Dimethicone / dimethiconol 3 0.192 0.288 Stearyldimethicone4 0.250 Oleth-20 4,327 1,000 4,327 1,000 4,500 Isopentane 2,887 1,900 1,925 2,887 2,887 Isobutane 0.963 1.900 1.925 0.963 0.963 Hydroxyethylcellulose 5 0.240 0.250 0.240 0.400 0.400 Hydroxypropylcellulose 6 0.019 0.019 0.020 0.020 Polycuatemium-10 ^ 0.240 0.144 0.200 0.250 PEG-14M8 0.144 0.144 0.250 0.200 PEG-115 9 0.025 Comoonente Ei. 1 Ei. 2 Ei. 3 Ei. 4 Ei. 5 Aloe Vera Gel 0.962 0.962 1.000 Fragrance, Color Conservative q. s. q.a. q. H.H . q.s. q.ß.

Water 74,854 7 34 73,892 74,484 72,724 1 Protol 180/190 and Camation 6575 from Wrtco Corp. 2 Panalane L-1 E from Amoco Chemical 3 DC 2-1420 from Dow Corning * DC 2503 from Dow Corning 5 Natrosol 250 HHR from Hercules Inc. 6 Klucel HHR from Aqualon 7 Polimer Amerchol LK 8 Poliox WSR N-3000 (about 300,000 MW) of Union Carbide 5 Poliox Coagulant (about 5 million MW) of Union Carbide Procedure: Dissolve hydroxyethylcellulose, polyquaternium-10 and PEG-14M (or 115M) in water at room temperature with stirring. After approximately 40 minutes of stirring, heat the aqueous solution to about 85 ° C, add the sarcosine (which has been pre-melted), the myristyl alcohol, the mineral oil and / or the hydrogenated polyisobutene and mix for about 10 minutes. Add the triethanolamine and Oleth-20 and continue mixing at approximately 85 ° C for approximately 30 minutes. Cool to 70 ° C, add the preservative and mix for 10 minutes. Cool to 35 ° C and add the silicone, fragrance, dye, aloe gel and hydroxypropylcellulose, the latter having first premixed with approximately 0.5 parts of water at 55 ° C, then in 3.5 additional parts of water at room temperature. After cooling to room temperature, the mixture is stirred with isopentane / isobutane and packaged in a barrier type aerosol container. Although the invention has been described in detail with particular reference to the preferred embodiments thereof, various modifications and substitutions will be apparent to those skilled in the art and should be considered to fall within the spirit and scope of the invention as defined by the following claims.

It is noted that in relation to this date, the best method known to the applicant to carry out the aforementioned invention, is the conventional one for the manufacture of the objects or products to which it refers. Having described the invention as above, property is claimed as contained in the following:

Claims

1. A shaving composition in the form of a self-foaming gel, characterized in that it comprises, in percent by weight, from about 65 to 85% water, from about 4 to 16% N-acyl sarcosine, wherein the acyl group has 10 to 20 carbon atoms, sufficient organic amine base to solubilize the N-acyl sarcosine and provide a pH from about 4 to about 8, from about 1 to 8% self-foaming agent and from about 1 to 10% non-volatile paraffinic hydrocarbon fluid , the composition is substantially soap-free.

2. The shaving composition according to claim 1, characterized in that the N-acyl sarcosine is selected from the group consisting of stearoyl sarcosine, myristoyl sarcosine, oleoyl sarcosine, lauroyl sarcosine, cocoyl sarcosine and mixtures thereof.

3. The shaving composition according to claim 2, characterized in that the organic amine base is triethanolamine.

4. The shaving composition according to claim 3, characterized in that the non-volatile paraffinic hydrocarbon fluid has from about 20 to about 40 carbon atoms and a viscosity from about 10 to about 50 ce at 40 ° C.

5. The shaving composition according to claim 4, characterized in that the self-foaming agent is a volatile hydrocarbon having from 4 to 6 carbon atoms or a mixture of such hydrocarbons.

6. The shaving composition according to claim 5, characterized in that it additionally comprises from about 1 to 8% of a nonionic surfactant.

7. The shaving composition according to claim 6, characterized in that it additionally comprises from about 1 to 8% of a fatty alcohol.

8. The shaving composition according to claim 7, characterized in that the non-volatile paraffinic hydrocarbon fluid is selected from the group consisting of mineral oil, hydrogenated polyisobutene and mixtures thereof.

9. The shaving composition according to claim 8, characterized in that it comprises from about 70 to 80% water, from about 6 to 12% N-acyl sarcosine, sufficient organic amine base to provide a pH from about 5 to about 7, of about 2 to 5% of self-foaming agent and of about 1.5 to 7% of non-volatile paraffinic hydrocarbon fluid, the composition is substantially free of other anionic surfactants.

10. The shaving composition according to claim 9, characterized in that it additionally comprises from about 0.05 to 2% of a cationic conditioning polymer.

11. The shaving composition according to claim 10, characterized in that it additionally comprises from about 0.01 to 5% of a thickening agent.

12. The shaving composition according to claim 11, characterized in that the cationic conditioning polymer is a polymeric quaternary ammonium salt of hydroxyethylcellulose.

13. The shaving composition according to claim 12, characterized in that the thickening agent is selected from the group consisting of hydroxyethylcellulose, hydroxypropylcellulose and mixtures thereof.

14. A shaving composition in the form of a self-foaming gel, characterized in that it comprises, in percent by weight, from about 65 to 85% water, from about 4 to 16% N-acyl sarcosine, wherein the acyl group has 12 to 18 carbon atoms, sufficient organic amine base to solubilize the N-acyl sarcosine and provide a pH from about 4 to about 8, from about 1 to 8% self-foaming agent and from about 1 to 10% non-volatile paraffinic hydrocarbon fluid , of about 1 to 8% of a nonionic surfactant and of about 1 to 8% of a fatty alcohol, the composition is substantially soap-free.

15. The shaving composition according to claim 14, characterized in that it comprises from about 70 to 80% water, from about 6 to 12% N-acyl sarcosine, sufficient base to provide a pH from about 5 to 7, from about 2 to 5% self-foaming agent, from about 1.5 to 7% non-volatile paraffinic hydrocarbon fluid, from about 1 to 6% of a nonionic surfactant and from about 2 to 6% of an alcohol gi-aso, the composition is substantially free of other anionic surfactants.

16. The shaving composition according to claim 15, characterized in that the N-acyl sarcosine is selected from the group consisting of stearoyl sarcosine, myristoyl sarcosine, oleoyl sarcosine, lauroyl sarcosine, cocoyl sarcosine and mixtures thereof, the organic amine base is triethanolamine, the non-volatile paraffinic hydrocarbon fluid it has from about 20 to about 40 carbon atoms and a viscosity from about 10 to about 50 is at 40 ° C and the self-foaming agent is a volatile hydrocarbon having from 4 to 6 carbon atoms or a mixture of such hydrocarbons.

17. The shaving composition according to claim 16, characterized in that the non-volatile paraffinic hydrocarbon fluid is selected from the group consisting of mineral oil, hydrogenated polyisobutene and mixtures thereof and the self-foaming agent is a mixture of isopentane and isobutane in a weight ratio from about 1: 1 to about 3: 1.

18. The shaving composition according to claim 17, characterized in that it additionally comprises from about 0.05 to 2% of a cationic conditioning polymer.

19. The shaving composition according to claim 18, characterized in that it additionally comprises from about 0.1 to 2% of a thickening agent selected from the group consisting of hydroxyethylcellulose, hydroxypropylcellulose and mixtures thereof.

20. The shaving composition according to claim 19, characterized in that the cationic conditioning polymer is a polymeric quaternary ammonium salt of hydroxyethylcellulose.