Synonyms: 1,3-Isobenzofurandione, polymer with 2,5-furandione, 2,2-oxybisethanol and 3a,4,7,7a-tetrahydro-1,3-isobenzofurandione;1,3-isobenzofurandione, polymer with 2,5-furandione, 2,2'-oxybis[ethanol] and 3;a,4,7,7a-tetrahydro-1,3-isobenzofurandione;Diethylene glycol, phthalic anhydride, maleic anhydride, tetrahydrophthalic anhydride polymer