2,5-Furandione, polymer with methoxyethene, calcium sodium salt Ethene, methoxy-, polymer with 2,5-furandione, calcium sodium salt Gantrez MS 955 Maleic anhydride-methoxyethylene copolymer calcium sodium salt Maleic anhydride-methyl vinyl ether copolymer calcium sodium salt Methyl vinyl ether-maleic anhydride copolymer calcium sodium salt