1,4-Butanediol, adipic acid, neopentyl glycol, 4,4'-diphenylmethanediisocyanate polymer 56815-45-3 Hexanedioic acid, polymer with 1,4-butanediol, 2,2-dimethyl-1,3-propanediol and 1,1'-methylenebis(4-isocyanatobenzene)