Process for the preparation of polybutylene terephthalate

Details Process for the preparation of polybutylene terephthalate Process for the preparation of polybutylene terephthalate

C - Chemistry, Metallurgy

08

G

402/206

C08G 63/16 (2006.01) C08G 63/78 (2006.01) C08G 63/85 (2006.01)

Patent

CA 1161596

ABSTRACT OF THE DISCLOSURE In the two stage reaction of terephthalic acid with 1,4-butanediol to produce polybutylene terephthalate in which acid and diol are first subjected to catalytic esterification/ oligomerization and the resulting product5 are thereafter subjected to catalytic polycondensation, the co-production of tetrahydrofuran is significantly reduced by conducting the polycondensation reaction prior to completion of the esterification/oligomerization reaction.

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