1,3-Isobenzofurandione, polymer with 2,5-furandione, 2,2'-oxybis(ethanol) and 1,2-propanediol, benzoate 68070-98-4 68186-47-0 94035-17-3 Phthalic anhydride-maleic anhydride-propylene glycol-diethylene glycol-benzoic acid polymer