1,3-Isobenzofurandione, hexahydro-, polymer with 2-ethyl-2-(hydroxymethyl)-1,3-propanediol and 1,3-isobenzofurandione 61842-72-6 Hexahydrophthalic anhydride, phthalic anhydride, trimethylolpropaneresin Phthalic anhydride, trimethylolpropane, hexahydrophthalic anhydridepolymer Trimethylolpropane, hexahydrophthalic anhydride, phthalic anhydridepolymer