Synonyms: 2-Butenedioicacid (2Z)-, monobutyl ester, polymer with methoxyethene (9CI); 2-Butenedioicacid (Z)-, monobutyl ester, polymer with methoxyethene; Maleic acid, monobutylester, polymer with methyl vinyl ether (8CI); Ethene, methoxy-, polymer with(Z)-butyl hydrogen 2-butenedioate; Ethene, methoxy-, polymer with butylhydrogen (2Z)-2-butenedioate (9CI); Ether, methyl vinyl, polymer with monobutylmaleate (8CI); BEM 42S; Butyl hydrogen maleate-methyl vinyl ether polymer;Maleic acid mono-n-butyl ester-methyl vinyl ether polymer; Maleic acidmonobutyl ester-methyl vinyl ether copolymer; Methyl vinyl ether-butyl hydrogenmaleate copolymer; Methyl vinyl ether-maleic acid monobutyl ester copolymer;Methyl vinyl ether-monobutyl maleate copolymer; Monobutyl maleate-methyl vinylether copolymer; Monobutyl maleate-methyl vinyl ether polymer; Monobutylmaleate-vinyl methyl ether copolymer; PVM-BE 40