PREPARATION FOR POLYBUTYLENE TEREPHATHALATE

摘要

A polybuthylene terephthalate is prepared by esterifying and polycondensating terephthalic acid and 1,4-butanediol in the presence of an esterification catalyst. The esterification catalyst is composed of a quaternary ammonium salt and at least one compound selected from organic titanium compounds and organic tin compounds. The quaternary ammonium salt is tetramethyl ammonium, tetraethyl ammonium or tetrapropyl ammonium. Specifically, the formation of tetrahydrofuran is restrained by the addition of the catalyst.