67785-47-1 Butanedioic acid, methylene-, polymer with butyl 2-propenoate, ethyl 2-propenoate, N-(hydroxymethyl)-2-propenamide and methyl 2-methyl-2-propenoate Butyl acrylate, ethyl acrylate, itaconic acid, methyl methacrylate,N-methylolacrylamide polymer