Patent ID: 8790622

Claim:
A formulation comprising an aqueous phase, a non-aqueous phase, and an amphiphilic non-water-soluble comb copolymer, wherein the amphiphilic non-water-soluble comb copolymer, in % by weight of each of its comonomers, comprises: a) from 30% to 60% of a hydroxy polyalkylene glycol monomer, a methoxy polyalkylene glycol monomer, or both, having formula R-(EO) m -(PO) n -R′, wherein m and n are each independently an integer less than or equal to 150, with at least one of m or n being non-zero, EO and PO are respectively ethylene oxide and propylene oxide, R is a methacrylate or methacrylurethane function, and R′ is a hydroxy or methoxy, group; b) from 20% to 60% of at least one hydrophobic monomer selected from the group consisting of styrene, paratertiobutylstyrene, and (meth)acrylic ester comprising 1 to 4 carbon atoms on an ester group; c) from 0.1% to 10% of a monomer which is acrylic acid, methacrylic acid, or both; d) from 0 to 15% of an associative monomer having formula R-(EO) m -(PO) n -R′, wherein m and n are each independently an integer less than or equal to 150, with at least one of m or n being non-zero, EO and PO are respectively ethylene oxide and propylene oxide, R is a methacrylate or methacrylurethane function, R′ is an alkyl, aryl, or alkylaryl group comprising 8 to 36 carbon atoms, linear or branched; and e) from 0 to 5% of a monomer with at least two ethylenic unsaturations, wherein the percentages of a), b), c), d), and e) sum to 100%, and wherein the copolymer has a mean molar mass by weight of between 1,000,000 and 15,000,000 g/mol as determined by Gel Permeation Chromatography.