2-Propenoic acid, 2-methyl-, polymer with ethyl 2-propenoate, methyl 2-methyl-2-propenoate, methyl 2-propenoate and 2-sulfoethyl 2-methyl-2-propenoate 65733-88-2 Methyl acrylate, ethyl acrylate, methacrylic acid, methyl methacrylate, sulfoethyl methacrylate polymer