CAS 115811-12-6 1,3-Benzenedicarboxylic acid polymer with 1,4-benzenedicarboxylic acid, 2,2-dimethyl-1,3-propanediol, 1,2-ethanediol, hexanedioic acid, 1,6-hexanediol and 1,1'-methylenebis [4-isocyanatobenzene], block (HCID 178573210)|化工社