Cyclic polyester oligomer and method for their preparation

Details Cyclic polyester oligomer and method for their preparation Cyclic polyester oligomer and method for their preparation

1988-02-01

1989-05-09

Anderson, Harold D.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528182, 528190, C08G 6300

Patent

active

048291447

ABSTRACT:
Cyclic polyester and especially polyarylate oligomers, typically having degrees of polymerization from 2 to about 7, are prepared by reacting a bisphenol such as bisphenol A or 6,6'-dihydroxy-3,3,3',3'-tetramethylspiro-(bis)indane with a dicarboxylic acid chloride such as isophthaloyl or terephthaloyl chloride in the presence of a catalyst, under conditions of low concentration. The cyclic oligomers may be polymerized to linear polyesters by contact with a transesterification catalyst at a temperature in the range of about 200.degree.-300.degree. C.

REFERENCES:
patent: 4757132 (1988-07-01), Brunelle et al.

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