2-Propenoic acid, 2-methyl-, polymer with butyl 2-propenoate, 2,3-dibromopropyl 2-propenoate and methyl 2-methyl-2-propenoate 67939-52-0 Butyl acrylate, methacrylic acid, 2,3-dibromopropyl acrylate, methyl methacrylate polymer