32238-28-1 Adipic acid, polymer with 1,4-butanediol, methylenedi-p-phenylene isocyanate and 2,2'-(p-phenylenedioxy)diethanol Diphenylmethane-4,4'-diisocyanate, hydroquinone bis(2-hydroxyethyl ether), 1,4-butanediol, adipic acid polymer Hexanedioic acid, polymer with 1,4-butanediol, 1,1'-methylenebis(4-isocyanatobenzene) and 2,2'-(1,4-phenylenebis(oxy))bis(ethanol) Polyurethane Y-221 Y 221