Method for forming polyesters

Details Method for forming polyesters Method for forming polyesters

1991-08-12

1993-09-07

Kight, III, John

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

Synthetic resins

From carboxylic acid or derivative thereof

C08G 6316, C08G 6383

Patent

active

052430227

ABSTRACT:
A method for forming polyesters (polyethylene terephthalate, PET) having a high degree of polymerization with improved color and lower diethylene glycol (DEG) content in a shorter period of time than in known methods. The method according to the invention comprises forming oligomers from ethylene glycol and terephthalic acid by esterification, forming prepolymers having a degree of polymerization ranging from 10 to 50 by polycondensing the resulting oligomers for an optimum time, forming polyesters by polycondensing the oligomers and the prepolymers in a weight ratio ranging from 1:0.1 to 1:90, thereby providing polyesters of improved color and low DEG content in a short time.

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