Patent ID: 7883692

Claim:
A cosmetic or pharmaceutical composition for use on keratin materials, said composition comprising an aqueous composition comprising a block polymer, said block polymer comprising water-soluble units alternating with one or more LCST units; wherein said water-soluble units comprise at least one monomer A selected from the group consisting of (meth)acrylic acid, a (meth)acrylic acid organic salt, a (meth)acrylic acid inorganic salt, and mixtures thereof, said water-soluble units having a reactive site located at each end of the water-soluble units; and wherein said one or more LCST units have a lower critical solution temperature and a molar mass of between 1,500 and 5,300 g/mol, wherein said LCST unit(s) comprise random copolymers of ethylene oxide and propylene oxide, said random copolymers having a reactive site located and each end of the random copolymer and having an ethylene oxide number of from 1 to 40 and a propylene oxide number of from 15 to 60, and salts thereof, wherein the block polymer is formed by coupling the water-soluble units with the LCST units through reaction of the water-soluble unit reactive site with the LCST unit reactive site.