2-Propenoic acid, 2-methyl-, 2-sulfoethyl ester, polymer with butyl2-propenoate, ethyl 2-propenoate and N-(hydroxymethyl)-2-propenamide 67785-37-9 Butyl acrylate, ethyl acrylate, N-methylolacrylamide, 2-sulfoethyl methacrylate polymer