68928-72-3 Butanedioic acid, methylene-, polymer with ethenyl acetate and 1-ethenyl-2-pyrrolidinone Methylenebutanedioic acid, polymer with ethenyl acetate and 1-ethenyl-2-pyrrolidinone N-Vinylpyrrolidinone, vinyl acetate, itaconic acid polymer PVP/VA/Itaconic acid copolymer