Cosmestic compositions containing a cationic polymer and an anionic polymer as thickening agent

Claim 2

Thickening agent resulting from the ionic interaction of a cationic polymer consisting of a copolymer of cellulose or of a cellulose derivative which is grafted with a quaternary ammonium salt of a water-soluble monomer, said cationic polymer having an absolute capillary viscosity at 1% in water at 30° C. which is less than 0.025 Pa s, and of a carboxylic anionic polymer having a molecular weight of 500 to 3,000,000, said carboxylic anionic polymer having an absolute capillary viscosity at a concentration of 5% in dimethylformamide or methanol at 30° C. which is less than or equal to 0.030 Pa s, said thickening agent having an Epprecht-Drage viscosity, module 3, higher than or equal to 0.45 Pa s in solution at a concentration of 1% in water at 21° C., and the weight ratio of said cationic polymer to said carboxylic anionic polymer in said thickening agent being in the range of 1/5 to 5/1.

Claim 3

Thickening agent according to claim 1, wherein the cationic polymer is chosen from hydroxyalkyl cellulose copolymers grafted by a radical route with a quaternary ammonium salt of a water-soluble monomer chosen from methacryloylethyltrimethylammonium, methacrylamidopropyltrimethylammonium and dimethyldiallylammonium salts.

Claim 4

Thickening agent according to claim 1 wherein the carboxylic anionic polymer is chosen from methacrylic acid homopolymers having a molecular weight greater than 20,000, as determined by light scattering, and copolymers of methacrylic acid with a following monomer: a C 1 -C 4 alkyl acrylate or methacrylate, an acrylamide derivative, maleic acid, a C 1 -C 4 monoalkyl maleate, N-vinylpyrrolidone and copolymers of ethylene with maleic anhydride.

Claim 5

Thickening agent according to claim 1, wherein the anionic polymer is chosen from copolymers of methacrylic acid with methyl methacrylate whose absolute capillary viscosity measured in solution in dimethylformamide at a concentration of 5% and at 30° C. is of the order of 0.015 Pa s, a copolymer of methacrylic acid with monoethyl maleate having an absolute capillary viscosity, measured in solution in dimethylformamide at a concentration of 5% and at 30° C., of the order of 0.013 Pa s, a copolymer of methacrylic acid with butyl methacrylate whose absolute capillary viscosity, measured in solution in methanol at a concentration of 5% and at 30° C., is of the order of 0.010 Pa s, and a copolymer of methacrylic acid with maleic acid whose absolute capillary viscosity, measured in solution in dimethylformamide at a concentration of 5% and at 30° C., is of the order of 0.016 Pa s.

Claim 6

Thickening agent according to claim 1, resulting from the ionic interaction in an aqueous medium containing 0.01 to 6% of said cationic polymer and 0.01 to 6% of said carboxylic anionic polymer.

Claim 7

Cosmetic composition intended for the treatment of hair, of the skin and of the nails, containing a thickening agent as defined in claim 1.

Claim 8

Cosmetic composition according to claim 6, wherein the thickening agent is present in proportions of between 0.02 and 12% by weight based on the total weight of the composition.

Claim 9

Composition according to claim 6, having a pH of between 6 and 12.

Claim 10

Composition according to claim 6, intended to be employed as a thickened or gelled lotion for hair-setting or for blow-drying, containing additionally nonionic polymers chosen from polyvinylpyrrolidones, copolymers of polyvinylpyrrolidone with vinyl acetate, or anionic polymers chosen from copolymers of vinyl acetate with an unsaturated carboxylic acid, the copolymers resulting from the polymerization of vinyl acetate with crotonic acid and an acrylic or methacrylic ester, the copolymers resulting from the copolymerization of vinyl acetate with a vinyl alkyl ether and an unsaturated carboxylic acid, the copolymers resulting from the copolymerization of vinyl acetate with crotonic acid and a vinyl ester of an acid containing a long carbon chain or an allyl or methallyl ester of an acid containing a long carbon chain.

Claim 11

Cosmetic composition according to claim 6, to be used as a shampoo containing one or more surface-active agents with a detergent property which are chosen from anionic, cationic, nonionic or amphoteric surfactants or mixtures thereof.

Claim 12

Cosmetic composition according to claim 6, intended to be rinsed off, containing conditioning agents chosen from quaternary proteins, cationic silicone polymers, cationic surfactants and cationic polymers other than polymers of cellulose or of cellulose derivatives grafted by a radical route with a quaternary ammonium water-soluble monomer.

Claim 13

Cosmetic composition intended to be employed for hair-setting, containing in an aqueous or aqueous-alcoholic medium, a thickener resulting from the ionic interaction of 0.1 to 1.5% by weight of a hydroxyethyl cellulose copolymer grafted by a radical route with diallyldimethylammonium chloride having an absolute capillary viscosity at 1% in water at 30° C. which is less than 0.025 Pa s and of 0.1 to 1.5% by weight of a copolymer of methacrylic acid with methyl methacrylate or with monoethyl maleate or with butyl methacrylate whose absolute capillary viscosity, measured at 30° C. in solution in dimethylformamide or methanol at a concentration of 5%, is between 0.010 and 0.015 Pa s, the copolymer of methacrylic acid having a molecular weight of 500 to 3,000,000, the Epprecht-Drage viscosity of the thickener, measured at 21° C., module 3, diluted to a concentration of 1% in water, being higher than 0.450 Pa s, the pH of the composition being between 6.5 and 9, and the thickener being present in the composition in an amount of 0.02 to 12% by weight, based on the total weight of the composition.

Claim 14

Cosmetic composition intended to be employed for hair-setting, containing in an aqueous or aqueous-alcoholic medium, a thickener resulting from the ionic interaction of 0.1 to 1.5% by weight of a hydroxyethyl cellulose copolymer grafted by a radical route with diallyldimethylammonium chloride having an absolute capillary viscosity at 1% in water at 30° C. which is less than 0.025 Pa s and of 0.1 to 1.5% by weight of a copolymer of methacrylic acid with methyl methacrylate or with monoethyl maleate or with butyl methacrylate whose absolute capillary viscosity, measured at 30° C. in solution in dimethylformamide or methanol at a concentration of 5%, is between 0.010 and 0.015 Pa s, the copolymer of methacrylic acid having a molecular weight of 500 to 3,000,000, the Epprecht-Drage viscosity of the thickener, measured at 21° C., module 3, diluted to a concentration of 1% in water, being higher than 0.450 Pa s, the pH of the composition being between 6.5 and 9, and the thickener being present in the composition in an amount of 0.02 to 12% by weight, based on the total weight of the composition.

Claim 15

Process for thickening or gelling aqueous cosmetic compositions, comprising the introduction of at least one thickener as defined in claim 1 into these compositions so as to give an Epprecht-Drage viscosity measured at 21° C. (module 3) which is equal to or higher than 0.450 Pa s at a concentration of 1% in water.

Claim 16

Process for the treatment of hair, of the skin or of the nails, wherein at least one cosmetic composition as defined in claim 6 is applied to said tissues.

Claim 17

Process for the treatment of hair, of the skin or of the nails, wherein the composition defined in claim 9 is applied to the said tissues, this application not being followed by a rinse.