1,3-Benzenedicarboxylic acid, polymer with 1,4-benzenedicarboxylic acid, 2,2-dimethyl-1,3-propanediol and 1,2-ethanediol 27923-68-8 50641-25-3 Terephthalic acid, isophthalic acid, ethylene glycol, neopentyl glycol polymer