Patent ID: 8039550
Filing Date: 2011-10-18
Classification: C08F

Abstract:
1. Polymer dispersion comprising a dispersed polymer (A) of one or more water soluble anionic monomers (m a polymeric stabiliser (B) which is a polymer of one or more monomers selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid, 2-acrylamido-2-methyl-1-propane sulphonic acid (AMPS), 2-acrylamido-2-methyl-1-butane sulphonic acid (AMBS), acryloyloxyethyl sulphonic acid, methacryloyloxyethyl sulphonic acid, acryloyloxypropyl sulphonic acid, methacryloyloxypropyl sulphonic acid, vinyl sulphonic acid, allyl sulphonic acid, methallyl sulphonic acid, styrene sulphonic acid, maleic acid, maleamidic acid, and vinyl phosphonic acid, or a copolymer of i) maleic acid or maleamidic acid, with ii) styrene or vinyl ethers or alpha-olefins, and a polymeric co-stabiliser (C) which is a polymer of one or more monomers selected from the group consisting of acrylic acid, methacrylic acid, vinyl sulphonate, styrene sulphonic acid, itaconic acid, vinylphosphonic acid, 2-acrylamido-2-methyl-1-propane sulphonic acid (AMPS), 2-acrylamido-2-methyl-1-butane sulphonic acid (AMBS), acryloyloxyethyl sulphonic acid, methacryloyloxyethyl sulphonic acid, acryloyloxypropyl sulphonic acid, and methacryloyloxypropyl sulphonic acid, the weight average molecular weight of the polymeric stabiliser (B) is from about 20,000 to about 1,000,000 g/mole and the weight average molecular weight of the polymeric co-stabiliser (C) is from about 1,000 to about 15,000 g/mole, wherein the polymer dispersion comprises an amount of inorganic salt of from 0 to about 0.5 weight % based on the total weight of the dispersion; and wherein the polymeric stabiliser (B) and the polymeric co-stabiliser (C) are made up from different monomers.