50981-28-7 55157-42-1 Hexanedioic acid, polymer with 1,4-butanediol, 4,4'-methylenebis(benzenamine) and 1,1'-methylenebis(4-isocyanatobenzene) Methylenebis(4-phenylisocyanate), adipic acid, 1,4-butylene glycol,4,4'-diaminodiphenylmethane polymer