Process for the preparation of polybutylene terephthalate

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

1980-08-25

1982-08-24

Morris, Theodore

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528274, 528275, C08G 6334

Patent

active

043462138

ABSTRACT:
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 products 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.

REFERENCES:
patent: 3050533 (1962-08-01), Munro et al.
patent: 3185668 (1965-05-01), Meyer et al.
patent: 3936421 (1976-02-01), Hayashi
patent: 4014858 (1977-03-01), Chipman et al.
patent: 4115371 (1978-09-01), Bier et al.

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