High molecular weight linear polyesters and method for their pre

Details High molecular weight linear polyesters and method for their pre High molecular weight linear polyesters and method for their pre

1984-11-30

1986-05-20

Michl, Paul R.

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

Synthetic resins

From carboxylic acid or derivative thereof

528274, 5283081, C08G 6376

Patent

active

045902593

ABSTRACT:
The molecular weight of linear polyesters such as poly(butylene terephthalate) and poly(ethylene terephthalate), especially the former, is increased by contacting a polyester having a maximum particle diameter of 1.0 and preferably 0.5 mm., with a mixture of an inert gas and an aliphatic diol such as 1,4-butanediol in the gaseous state at a temperature about 5.degree.-15.degree. C. below its equilibrium melting temperature, at a diol partial pressure of about 0.1-10 torr, to reduce the proportion of acid end groups; and subjecting the product thus obtained to solid state polymerization under vacuum. By this method, polyesters having a number average molecular weight of at least 100,000, useful for blow molding and the like, can be obtained.

REFERENCES:
patent: 3161710 (1964-12-01), Turner
patent: 3756990 (1973-09-01), Jaeger
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patent: 4374975 (1983-02-01), Duh
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Buxbaum, J. Appl. Poly. Sci.: App. Polymer Symposium, 35, 59-66, (1979).

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