Patent ID: 8785578

Claim:
A polymer comprising, expressed as a % by weight of each of the monomers, polymerized units of the following monomers: a) 30% to 60% of at least one hydroxy- and/or methoxy-polyalkylene glycol monomer, with the formula R-(EO) m -(PO) n -R′, where: m and n designate integers less than or equal to 150, at least one of which is non-zero, EO and PO respectively designate ethylene oxide and propylene oxide, R designates a methacrylate or methacrylurethane function, and R′ designates a hydrogen radical or a methyl radical, b) 48% to 60% of at least one monomer selected from the group consisting of styrene and (meth)acrylic esters whose ester portion has 1 to 4 carbon atoms, c) 0.1% to 10% of at least one of acrylic acid and methacrylic acid, d) 0 to 5% of a monomer whose formula is R-(EO) m -(PO) n -R″, where: m and n designate integers less than or equal to 150, at least one of which is non-zero, EO and PO respectively designate ethylene oxide and propylene oxide, R designates a methacrylate or methacrylurethane function, R″ designates an alkyl or aryl or alkylaryl group having 8 to 32 linear or branched carbon atoms, e) 0 to 5% of a monomer comprising two ethylenic unsaturations, the sum of a), b), c), d), and e) being equal to 100%, wherein said polymer is non-water-soluble in acid form.