Patent ID: 7652100

Claim:
A dispersion in the form of a cosmetic make-up or care composition comprising at least one cosmetic or dermatological adjuvant, at least one aqueous phase and at least one oily phase, wherein the aqueous phase comprises a polymer comprising water-soluble units and units with an LCST, the units with an LCST having in water a demixing temperature of from 5 to 40° C. at a concentration of 1% by mass, and the polymer being present in the aqueous phase at a concentration such that the gel point of the aqueous phase is from 5 to 40° C., to ensure the stability of the dispersion when it is subjected to temperature variations in the range from 4 to 50° C., wherein the polymer comprises an oligomer or copolymer of water-soluble units wherein the polymer is water-soluble at all temperatures from 5 to 80° C. at a concentration of at least 10 g/l, and wherein the units with an LCST are one or more of the following polymers: polyethers; polyvinyl methyl ethers; polymeric N-substituted acrylamide derivatives; copolymers of N-isopropylacrylamide or of N -ethylacrylaide and a vinyl monomer corresponding to formula (I): wherein: R is from H,—CH 3 ,—C 2 H 5 or —C 3 H 7 , and X is: OR′ alkyl oxides wherein R′ is a linear or branched, saturated or unsaturated hydrocarbon radical containing from 1 to 6 carbon atoms, optionally substituted with at least one halogen atom; a sulphonic group, a sulphate group, a phosphate group; a hydroxyl group; a primary amine; a secondary amine; a tertiary amine; or a quaternary amine group of the formula N + R 1 R 2 R 3 wherein R 1 , R 2 and R 3 are, independently, a linear or branched, saturated or unsaturated hydrocarbon radical containing 1 to 6 carbon atoms, with the proviso that the sum of the carbon atoms of R′+R 1 +R 2 +R 3 does not exceed 7; and —NH 2 ,—NHR 4 and —NR 4 R 5 groups in which R 4 and R 5 are, independently of each other, linear or branched, saturated or unsaturated hydrocarbon radicals containing 1 to 6 carbon atoms, with the proviso that the total number of carbon atoms in R 4 +R 5 does not exceed 7, the said R 4 and R 5 optionally being substituted with a halogen atom (iodine, bromine, chlorine or fluorine); a hydroxyl (—OH); sulphonic (—SO 3 − ), sulphate (—SO 4 − ); phosphate (—PO 4 H 2 ); primary amine (—NH 2 ); secondary amine (—NHR 1 ), tertiary amine (—NR 1 R 2 ) and/or quaternary amine (—N + R 1 R 2 R 3 ) group with R 1 , R 2 and R 3 being, independently of each other, a linear or branched, saturated or unsaturated hydrocarbon radical containing 1 to 6 carbon atoms, with the proviso that the sum of the carbon atoms of R 4 +R 5 +R 1 +R 2 +R 3 does not exceed 7; copolymers of N-isopropylacrylamide or of N-ethylacrylaide and a monomer selected from the group consisting of maleic anhydride, itaconic acid, vinylpyrrolidone, styrene and its derivatives, dimethyldiallylammonium chloride, vinylacetamide, vinyl ethers and vinyl acetate derivatives; or polyvinylcaprolactam; copolymers of vinylcaprolactam and a vinyl monomer corresponding to formula (I).