Use in cosmetics of copolymers with a flexible backbone, grafted with hydrophobic and rigid macromonomers; compositions using same

摘要

Use of a graft copolymer with a skeleton (S) comprising a copolymer with a Tg of 0-30 degrees C, obtained by radical polymerisation or polycondensation, having a graft of a hydrophobic macromonomer (M) with a glassy Tg above 25 degrees C, for cosmetic and dermatological compositions, is new. Preferably (M) are hydrophobic hydrocarbons, hydrofluorocarbons, or fluorocarbons, with T'g above 25 degrees C, preferably 30 degrees C. (M) have a surface tension of 40 dyne/cm or less at 20 degrees C and an average molecular weight (summit of peak by steric exclusion chromatography) of 200-30000. Macromonomers (M) are chosen from oligomers which can be copolymerised by a radical route, with the monomers of the skeleton (S) and have a radical terminal carrying a double bond; oligomers with a radical terminal carrying a reactive function capable of interacting with (S) or its monomers (e.g. -OH, -NH2, -COOH, anhydride); or preferably oligomers which can be polycondensed with the skeleton monomers, with a radical terminal carrying a reactive function (e.g. diol, diamine, carboxylic diacid).