2-Propenoic acid, 2-methyl-, butyl ester, polymer with methyl 2-methyl-2-propenoate, 2-methylpropyl 2-methyl-2-propenoate and 2-sulfoethyl 2-methyl-2-propenoate 68877-31-6 Butyl methacrylate, isobutyl methacrylate, methyl methacryllate, 2-sulfoethyl methacrylate polymer