2-Propenoicacid,2-methyl-,butylester,homopolymer;Butyl2-methyl-2-propenoate,homopolymer;POLY(BUTYL METHACRYLATE) STANDARD 40'000;POLY(BUTYL METHACRYLATE) STANDARD 500'00 0;POLY(BUTYL METHACRYLATE) STANDARD 20'000;POLY(BUTYL METHACRYLATE) STANDARD 10'000;POLY(BUTYL METHACRYLATE), SECONDARY STAN DARD;POLY(BUTYL METHACRYLATE) STANDARD 800'00 0