2-Propenoic acid, 2-methyl-, polymer with 1-ethenyl-2-pyrrolidinone and ethyl 2-methyl-2-propenoate ACRYLATEPVPCOPOLYMER ACRYLATES/VP COPOLYMER 1-ethenylpyrrolidin-2-one,ethyl 2-methylprop-2-enoate,2-methylprop-2-enoic acid Poly(1-ethenyl-2-pyrrolidinoneco--co-2-methyl-2-propenoic acid) Poly(1-vinyl-2-pyrrolidinone-co-ethylmethacrylate-co-methacrylic acid) PVP-ethyl methacrylate-methacrylic acid copolymer