2-Propenoic acid, 2-methyl-, polymer with butyl 2-propenoate, ethyl2-propenoate and N-(hydroxymethyl)-2-propenamide 67785-43-7 Butyl acrylate, ethyl acrylate, methacrylic acid, N-methylolacrylamide polymer Ethyl acrylate-N-methylolacrylamide-n-butyl