2-Propenoic acid, 2-methyl-, polymer with 1,1-dichloroethene, methyl 2-methyl-2-propenoate and 2-sulfoethyl 2-methyl-2-propenoate 67033-17-4 Vinylidene chloride, methacrylic acid, methyl methacrylate, 2-sulfoethyl methacrylate polymer