1,3-Benzenedicarboxylic acid, 5-sulfo-, 1,3-dimethyl ester, sodium salt, polymer with dimethyl 1,4-benzenedicarboxylate and 1,2-ethanediol 27937-63-9 Polyester(ethylene glycol:isophthalic acid, 5-sulfo-, sodium salt:terephthalic acid)