1,3-Benzenedicarboxylic acid, polymer with 1,4-benzenedicarboxylic acid and 1,4-butanediol 111643-31-3 111744-88-8 30580-17-7 Terephthalic acid, isophthalic acid, 1,4-butanediol polyester Terephthalic acid, isophthalic acid, 1,4-butanediol polymer