1,3-Isobenzofurandione, polymer with 1,2-ethanediol, 2,2'-(1,2-ethanediylbis(oxy))bis(ethanol) and 2-ethyl-2-(hydroxymethyl)-1,3-propanediol 50601-57-5 Ethylene glycol, triethylene glycol, trimethylol propane, phthalic anhydride polymer