Process for producing polyester

Details Process for producing polyester Process for producing polyester

1988-11-03

1989-08-29

Kight, John

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

Synthetic resins

From carboxylic acid or derivative thereof

528302, 528308, 5283083, 5283087, 528480, 526 88, C08G 6322

Patent

active

048618608

ABSTRACT:
A polyester having a high quality is produced by stirring its polycondensation reaction mixture in such a way that the stirring rate is reduced continuously in a stepwise manner corresponding to an increase in the melt viscosity as the reaction proceeds so that the stirring load is substantially constant after the viscosity of the reaction system has reached an arbitary value between 20 and 800 P until the completion of the reaction.

REFERENCES:
patent: 3925329 (1975-12-01), Heinrich et al.
patent: 3987021 (1976-10-01), Rothert
patent: 4107409 (1978-08-01), Szabolcs et al.
patent: 4299935 (1981-11-01), Chatelain
patent: 4657871 (1987-04-01), Freakley et al.

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