2-Propenoic acid, 2-methyl-, polymer with butyl 2-propenoate, methyl 2-methyl-2-propenoate and N-((2-methylpropoxy)methyl)-2-propenamide 76081-68-0 Butyl acrylate, methyl methacrylate, N-(isobutoxymethyl)acrylamide,methacrylic acid polymer