Patent ID: 7745556

Claim:
A process for polymerizing vinyl chloride monomer, comprising subjecting vinyl chloride monomer to suspension polymerization in the presences of a copolymer of (i) an alkyl acrylate or alkyl methacrylate and (ii) a hydroxyalkyl acrylate or hydroxyalkyl methacrylate as a secondary type protective colloid, wherein the alkyl group of said alkyl acrylate or alkyl methacrylate is a C 3 to C 16 alkyl group, wherein said copolymer comprises from 20% to 50% by weight of alkyl acrylate or methacrylate moieties and from 80% to 50% by weight of hydroxyalkyl acrylate or methacrylate moieties and wherein said copolymer has a peak average molecular weight as determined by reversed phase liquid chromatography of from 5000 to 50000.