1,4-Benzenedicarboxylic acid, 1,4-butandiol, 1,2-ethanediol, 1,1'-methylenebis(4-isocyanatobenzene) polymer 1,4-Benzenedicarboxylic acid, polymer with 1,4-butanediol, 1,2-ethanediol and 1,1'-methylenebis(4-isocyanatobenzene) 73003-54-0