2-Propenoic acid, polymer with 2-ethylhexyl 2-propenoate, ethyl 2-propenoate and N-(hydroxymethyl)-2-propenamide 68133-44-8 70213-40-0 Ethyl acrylate-acrylic acid-2-ethylhexyl acrylate-N-methylolacrylamide polymer