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Cosmetic compositions comprising, in a cosmetically acceptable medium, at least one crosslinked methacrylic acid/C1-C4 alkyl acrylate copolymer, at least one oil chosen from synthetic oils, C3-C14 acid esters comprising in total less than 20 carbon atoms, and plant oils with a palmitoleic acid conte

Cosmetic compositions comprising, in a cosmetically acceptable medium, at least one crosslinked methacrylic acid/C1-C4 alkyl acrylate copolymer, at least one oil chosen from synthetic oils, C3-C14 acid esters comprising in total less than 20 carbon atoms, and plant oils with a palmitoleic acid content of greater than or equal to 0.2% by weight of the oil. These compositions can be used for washing and/or conditioning keratin materials such as the hair or the skin.

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What is claimed is: 1. A cosmetic composition comprising, in a cosmetically acceptable medium, at least one crosslinked copolymer of methacrylic acid and of a C1-C4 alkyl acrylate, at least one plant oil with a palmitoleic acid content of greater than or equal to 0.2% by weight of the oil, wherein

What is claimed is: 1. A cosmetic composition comprising, in a cosmetically acceptable medium, at least one crosslinked copolymer of methacrylic acid and of a C1-C4 alkyl acrylate, at least one plant oil with a palmitoleic acid content of greater than or equal to 0.2% by weight of the oil, wherein the plant oils are chosen from avocado oils, jojoba oils, olive oils, apricot oils and transesterified oils, and at least one cationic polysaccharide chosen from guar gums modified with a 2,3-epoxypropyltrimethylammonium salt and from hydroxyethylcelluloses that have reacted with an epoxide substituted with a trimethylammonium group. 2. The composition according to claim 1, characterized in that, in the at least one crosslinked copolymer, the methacrylic acid residue is in an amount ranging from 20% to 80% by weight relative to the total weight of the copolymer. 3. The composition according to claim 2, characterized in that, in the at least one crosslinked copolymer, the methacrylic acid residue is in an amount ranging from 25% to 70% by weight relative to the total weight of the copolymer. 4. The composition according to claim 3, characterized in that, in the at least one crosslinked copolymer, the methacrylic acid residue is in an amount ranging from 35% to 60% by weight relative to the total weight of the copolymer. 5. The composition according to claim 1, characterized in that, in the at least one crosslinked copolymer, the alkyl acrylate residue is in an amount ranging from 15% to 80% by weight relative to the total weight of the copolymer. 6. The composition according to claim 5, characterized in that, in the at least one crosslinked copolymer, the alkyl acrylate residue is in an amount ranging from 25% to 75% by weight relative to the total weight of the copolymer. 7. The composition according to claim 6, characterized in that, in the at least one crosslinked copolymer, the alkyl acrylate residue is in an amount ranging from 40% to 65% by weight relative to the total weight of the copolymer. 8. The composition according to claim 1, characterized in that, in the at least one crosslinked copolymer, the alkyl acrylate residue is chosen from methyl acrylate, ethyl acrylate, and butyl acrylate residues. 9. The composition according to claim 8, characterized in that the alkyl acrylate residue is ethyl acrylate residue. 10. The composition according to claim 1, wherein the at least one crosslinked copolymer of methacrylic acid and of a C1-C4 alkyl acrylate is crosslinked with at least one ethylenically polyunsaturated crosslinking agent. 11. The composition according to claim 10, characterized in that the content of the at least one ethylenically polyunsaturated crosslinking agent ranges from 0.01% to 5% by weight relative to the total weight of the copolymer. 12. The composition according to claim 11, characterized in that the content of the at least one ethylenically polyunsaturated crosslinking agent ranges from 0.03% to 3% by weight relative to the total weight of the copolymer. 13. The composition according to claim 12, characterized in that the content of the at least one ethylenically polyunsaturated crosslinking agent ranges from 0.05% to 1% by weight relative to the total weight of the copolymer. 14. The composition according to claim 1, characterized in that the at least one crosslinked copolymer of methacrylic acid and of a C1-C4 alkyl acrylate is in the form of a dispersion of particles in water. 15. The composition according to claim 14, characterized in that the number-average size of the particles of the copolymer in the dispersion ranges from 10 to 500 nm. 16. The composition according to claim 15, characterized in that the number-average size of the particles of the copolymer in the dispersion ranges from 20 to 200 nm. 17. The composition according to claim 16, characterized in that the number-average size of the particles of the copolymer in the dispersion ranges from 50 to 150 nm. 18. The composition according to claim 1, characterized in that the at least one crosslinked copolymer of methacrylic acid and of a C1-C4 alkyl acrylate is in a concentration ranging from 0.01% to 20% by weight relative to the total weight of the composition. 19. The composition according to claim 18, characterized in that the at least one crosslinked copolymer of methacrylic acid and of a C1-C4 alkyl acrylate is in a concentration ranging from 0.05% to 15% by weight relative to the total weight of the composition. 20. The composition according to claim 1, characterized in that the plant oil is in a concentration ranging from 0.001% to 20% by weight relative to the total weight of the composition. 21. The composition according to claim 20, characterized in that the plant oil is in a concentration ranging from 0.01% to 10% by weight relative to the total weight of the composition. 22. The composition according to claim 1, characterized in that the cationic polysaccharide is in a concentration ranging from 0.001% to 20% by weight relative to the total weight of the composition. 23. The composition according to claim 22, characterized in that the cationic polysaccharide is in a concentration ranging from 0.01% to 10% by weight relative to the total weight of the composition. 24. The composition according to claim 1, further comprising at least one surfactant chosen from anionic, nonionic, amphoteric and cationic surfactants. 25. The composition according to claim 24, characterized in that the at least one surfactant is chosen from anionic surfactants, mixtures of at least one anionic surfactant and at least one amphoteric surfactant, and mixtures of at least one anionic surfactant and at least one nonionic surfactant. 26. The composition according to claims 24, characterized in that the at least one surfactant is in a concentration ranging from 0.01% to 50% by weight relative to the total weight of the composition. 27. The composition according to claims 26, characterized in that the at least one surfactant is in a concentration ranging from 0.1% to 40% by weight relative to the total weight of the composition. 28. The composition according to claims 27, characterized in that the at least one surfactant is in a concentration ranging from 0.5% to 30% by weight relative to the total weight of the composition. 29. The composition according to claim 1, further comprising at least one additive chosen from thickeners, antidandruff agents, anti-seborrhoeic agents, fragrances, nacreous agents, hydroxy acids, electrolytes, preserving agents, silicone and non-silicone sunscreens, vitamins, provitamins, anionic and nonionic polymers, proteins, protein hydrolysates, 18-methyleicosanoic acid, fluoro and perfluoro oils, silicones, natural and synthetic waxes, compounds of ceramide type, fatty amines, fatty acids and derivatives thereof, fatty alcohols and derivatives thereof. 30. The composition according to claim 29, wherein the provitamins are chosen from panthenol. 31. The composition according to claim 1, characterized in that the composition is in the form of a shampoo, a conditioner, a permanent-waving, straightening, dyeing or bleaching composition for hair, a rinse-out composition to be applied between the two steps of a permanent-waving or hair-straightening operation, or a washing composition for a body. 32. A composition for washing or caring for a keratin material comprising, in a cosmetically acceptable medium, at least one crosslinked copolymer of methacrylic acid and of a C1-C4 alkyl acrylate, and at least one plant oil with a palmitoleic acid content of greater than or equal to 0.2% by weight of the oil, wherein the plant oils are chosen from avocado oils, jojoba oils, olive oils, apricot oils and transesterified oils, and at least one cationic polysaccharide chosen from guar gums modified with a 2,3-epoxypropyltrimethylammonium salt and from hydroxyethylcelluloses that have reacted with an epoxide substituted with a trimethylammonium group, said composition being effective for washing or caring for a keratin material. 33. A method for washing or caring for a keratin material comprising applying to the keratin material a composition comprising, in a cosmetically acceptable medium, at least one crosslinked copolymer of methacrylic acid and of a C1-C4 alkyl acrylate, at least one plant oil with a palmitoleic acid content of greater than or equal to 0.2% by weight of the oil, wherein the plant oils are chosen from avocado oils, jojoba oils, olive oils, apricot oils and transesterified oils, and at least onecationic polysaccharide chosen from guar gums modified with a 2,3-epoxypropyltrimethylammonium salt and from hydroxyethylcelluloses that have reacted with an epoxide substituted with a trimethylammonium group. 34. A process for treating a keratin material, comprising applying to the keratin material a cosmetic composition comprising, in a cosmetically acceptable medium, at least one crosslinked copolymer of methacrylic acid and of a C1-C4 alkyl acrylate, at least one plant oil with a palmitoleic acid content of greater than or equal to 0.2% by weight of the oil, wherein the plant oils are chosen from avocado oils, jojoba oils, olive oils, apricot oils and transesterified oils, and at least one cationic polysaccharide chosen from guar gums modified with a 2,3-epoxypropyltrimethylammonium salt and from hydroxyethylcelluloses that have reacted with an epoxide substituted with a trimethylammonium group, and then optionally rinsing it out with water. 35. The process according to claim 34, wherein the keratin material is hair. 36. A composition comprising, in a cosmetically acceptable medium, one composition (1) comprising at least one crosslinked methacrylic acid/C1-C4 acrylate copolymer and another composition (2) comprising at least one plant oil with a palmitoleic acid content of greater than or equal to 0.2% by weight of the oil, wherein the plant oils are chosen from avocado oils, jojoba oils, olive oils, apricot oils and transesterified oils, and at least one cationic polysaccharide chosen from guar gums modified with a 2,3-epoxypropyltrimethylammonium salt and from hydroxyethylcelluloses that have reacted with an epoxide substituted with a trimethylammonium group. 37. A method of manufacturing a cosmetic composition, comprising including in said composition at least one crosslinked copolymer of methacrylic acid and of a C1-C4 alkyl acrylate, at least one plant oil with a palmitoleic acid content of greater than or equal to 0.2% by weight of the oil, wherein the plant oils are chosen from avocado oils, jojoba oils, olive oils, apricot oils, and transesterified oils, and at least one cationic polysaccharide chosen guar gums modified with a 2,3-epoxypropyltrimethylammonium salt and from hydroxyethylcelluloses that have reacted with an epoxide substituted with a trimethylammonium group. 38. A composition to give hair lightness comprising, in a cosmetically acceptable medium, at least one crosslinked copolymer of methacrylic acid and of a C1-C4 alkyl acrylate, at least one plant oil with a palmitoleic acid content of greater than or equal to 0.2% by weight of the oil, wherein the plant oils are chosen from avocado oils, jojoba oils, olive oils, apricot oils, and transesterified oils, and at least one cationic polysaccharide chosen from guar gums modified with a 2,3-epoxypropyltrimethylammonium salt and from hydroxyethylcelluloses that have reacted with an epoxide substituted with a trimethylammonium group, said composition being effective for giving hair lightness. 39. A method to give hair lightness, comprising applying to the hair a composition comprising, in a cosmetically acceptable medium, at least one crosslinked copolymer of methacrylic acid and of a C1-C4 alkyl acrylate, at least one plant oil with a palmitoleic acid content of greater than or equal to 0.2% by weight of the oil, wherein the plant oils are chosen from avocado oils, jojoba oils, olive oils, apricot oils, and transesterified oils, and at least one cationic polysaccharide chosen from guar gums modified with a 2,3-epoxypropyltrimethylammonium salt and from hydroxyethylcelluloses that have reacted with an epoxide substituted with a trimethylammonium group. 40. A composition to give hair softness comprising, in a cosmetically acceptable medium, at least one crosslinked copolymer of methacrylic acid and of a C1-C4 alkyl acrylate, at least one plant oil with a palmitoleic acid content of greater than or equal to 0.2% by weight of the oil, wherein the plant oils are chosen from avocado oils, jojoba oils, olive oils, apricot oils, and transesterified oils, and at least one cationic polysaccharide chosen from guar gums modified with a 2,3-epoxypropyltrimethylammonium salt and from hydroxyethylcelluloses that have reacted with an epoxide substituted with a trimethylammonium group, said composition being effective for giving hair softness. 41. A method to give hair softness, comprising applying to the hair a composition comprising, in a cosmetically acceptable medium, at least one crosslinked copolymer of methacrylic acid and of a C1-C4 alkyl acrylate, at least one plant oil with a palmitoleic acid content of greater than or equal to 0.2% by weight of the oil, wherein the plant oils are chosen from avocado oils, jojoba oils, olive oils, apricot oils, and transesterified oils, and at least one cationic polysaccharide chosen from guar gums modified with a 2,3-epoxypropyltrimethylammonium salt and from hydroxyethylcelluloses that have reacted with an epoxide substituted with a trimethylammonium group. 42. A composition to give hair a smooth feel comprising, in a cosmetically acceptable medium, at least one crosslinked copolymer of methacrylic acid and of a C1-C4 alkyl acrylate, at least one plant oil with a palmitoleic acid content of greater than or equal to 0.2% by weight of the oil, wherein the plant oils are chosen from avocado oils, jojoba oils, olive oils, apricot oils, and transesterified oils, and at least one cationic polysaccharide chosen from guar gums modified with a 2,3-epoxypropyltrimethylammonium salt and from hydroxyethylcelluloses that have reacted with an epoxide substituted with a trimethylammonium group, said composition being effective for giving hair a smooth feel. 43. A method to give hair a smooth feel, comprising applying to the hair a composition comprising, in a cosmetically acceptable medium, at least one crosslinked copolymer of methacrylic acid and of a C1-C4 alkyl acrylate, at least one plant oil with a palmitoleic acid content of greater than or equal to 0.2% by weight of the oil, wherein the plant oils are chosen from avocado oils, jojoba oils, olive oils, apricot oils, and transesterified oils, and at least one cationic polysaccharide chosen from guar gums modified with a 2,3-epoxypropyltrimethylammonium salt and from hydroxyethylcelluloses that have reacted with an epoxide substituted with a trimethylammonium group. 44. A composition to give hair flexibility comprising, in a cosmetically acceptable medium, at least one crosslinked copolymer of methacrylic acid and of a C1-C4 alkyl acrylate, at least one plant oil with a palmitoleic acid content of greater than or equal to 0.2% by weight of the oil, wherein the plant oils are chosen from avocado oils, jojoba oils, olive oils, apricot oils, and transesterified oils, and at least one cationic polysaccharide chosen from guar gums modified with a 2,3-epoxypropyltrimethylammonium salt and from hydroxyethylcelluloses that have reacted with an epoxide substituted with a trimethylammonium group, said composition being effective for giving hair flexibility. 45. A method to give hair flexibility, comprising applying to the hair a composition comprising, in a cosmetically acceptable medium, at least one crosslinked copolymer of methacrylic acid and of a C1-C4 alkyl acrylate, at least one plant oil with a palmitoleic acid content of greater than or equal to 0.2% by weight of the oil, wherein the plant oils are chosen from avocado oils, jojoba oils, olive oils, apricot oils, and transesterified oils, and at least one cationic polysaccharide chosen from guar gums modified with a 2,3-epoxypropyltrimethylammonium salt and from hydroxyethylcelluloses that have reacted with an epoxide substituted with a trimethylammonium group. 46. A cosmetic composition comprising, in a cosmetically acceptable medium, at least one crosslinked copolymer of methacrylic acid and of a C1-C4 alkyl acrylate, at least one plant oil with a palmitoleic acid content of greater than or equal to 0.2% by weight of the oil, wherein the plant oils are chosen from avocado oils, jojoba oils, olive oils, apricot oils, and transesterified oils, and at least one cationic polysaccharide chosen from guar gums modified with a 2,3-epoxypropyltrimethylammonium salt and from hydroxyethylcelluloses that have reacted with an epoxide substituted with a trimethylammonium group, wherein the at least one crosslinked copolymer of methacrylic acid and of a C1-C4 alkyl acrylate is in the form of a dispersion of particles in water, and that the number-average size of the particles of the copolymer in the dispersion ranges from 10 to 500 nm.