5-Isobenzofurancarboxylic acid, 1,3-dihydro-1,3-dioxo-, polymer with alpha-hydro-omega-hydroxypoly(oxy(methyl-1,2-ethanediyl)) ether with 2,2-bis(hydroxymethyl)-1,3-propanediol (4:1) 68391-22-0 Trimellitic anhydride, propoxylated pentaerythritol polymer