Method for producing polybutylene terephthalate

Details Method for producing polybutylene terephthalate Method for producing polybutylene terephthalate

1998-03-25

2000-05-09

Acquah, Samuel A.

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

Synthetic resins

From carboxylic acid or derivative thereof

528283, 528308, 5283086, 524783, 524784, C08G 6378

Patent

active

060605790

ABSTRACT:
A method for producing polybutylene terephthalate comprising continuously esterifying a dicarboxylic acid component consisting essentially of terephthalic acid with a diol component consisting essentially of 1,4-butanediol followed by polycondensing the resulting oligomer, wherein the esterification is effected in a molar ratio, P, of the diol component to the dicarboxylic acid component to fall between 1.1 and 1.6, in the presence of a combination of an organic titanium compound and an organic tin compound that satisfies the following requirement:

REFERENCES:
patent: 3936421 (1976-02-01), Hayashi et al.
patent: 4329444 (1982-05-01), Borman

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