Process for forming polyesters

Details Process for forming polyesters Process for forming polyesters

1993-04-27

1994-02-15

Kight, III, John

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

Synthetic resins

From carboxylic acid or derivative thereof

528272, 528279, 528285, C08G 6302, C08G 6378, C08G 6382

Patent

active

052868362

ABSTRACT:
A process for forming polyesters that comprises the steps of esterifying a terephthalic acid and an ethylene glycol to produce an esterification product containing a bis (betahydroxyethyl) terephthalate, and continuously polycondensing the obtained esterification product to form a polyester. In both the esterifying step and the polycondensing step, a reaction catalyst consisting of a compound of antimony and a compound of titanium is used. The weight ratio of the compound of antimony to the compound of titanium is 0.01 to 100. The process of the present invention can considerably reduce both the esterification time and the polycondensation time and provides good color, reduced diethylene glycol content and reduced condensation of terminal carboxyl groups in the resulting polyesters.

REFERENCES:
patent: 3528946 (1970-09-01), Stewart et al.
patent: 3752866 (1973-08-01), Doerr
patent: 3803099 (1974-04-01), Okuzumi
patent: 4347351 (1982-08-01), Swart

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