Method for preparing cyclic polyarylate oligomers

Details Method for preparing cyclic polyarylate oligomers Method for preparing cyclic polyarylate oligomers

1989-06-12

1990-05-22

Anderson, Harold D.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528179, C08G 6330, C08G 6327

Patent

active

049279041

ABSTRACT:
Cyclic polyarylate oligomer compositions are prepared by the reaction of an aromatic dicarboxylic acid halide, such as isophthaloyl chloride or terephthaloyl chloride, with a water-soluble salt of a dihydroxyaromatic compound, such as bisphenol A disodium salt. Freshly prepared solutions of the halide in an organic liquid such as methylene chloride, and of the salt in water, are simultaneously introduced into an organic liquid containing a catalytic amount of at least one quaternary ammonium salt having a single alkyl group containing about 8-20 carbon atoms and having not more than 5 additional carbon atoms. The dihydroxyaromatic compound salt is employed in the amount of at least about 3% in excess of stoichiometric.

REFERENCES:
patent: 4757132 (1988-07-01), Brunelle et al.
patent: 4829144 (1989-05-01), Brunelle et al.

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