Process for stabilizing polyarylates with an aromatic phenol

Details Process for stabilizing polyarylates with an aromatic phenol Process for stabilizing polyarylates with an aromatic phenol

1979-10-29

1981-07-28

Welsh, Maurice J.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

260 4595R, 525437, 528179, 528180, 528181, 528191, 528193, 528195, 528308, 528309, C08L 6702

Patent

active

042810990

ABSTRACT:
Described herein is a process for preparing melt stable polyarylates having a reduced viscosity of from about 0.4 to greater than 1.0 dl/g which comprises reacting a diester derivative of a dihydric phenol with an aromatic dicarboxylic acid to produce a polyarylate having a reduced viscosity of from about 0.5 to greater than 1.0 dl/g, and then adding a stabilizing amount of an aromatic phenol to the polyarylate to form a polyarylate substantially free of anhydride linkages.

REFERENCES:
patent: 3317464 (1967-05-01), Conix
patent: 3775375 (1973-11-01), Wolfe
patent: 3948856 (1976-04-01), Stackman
patent: 4011196 (1977-03-01), Carevic et al.
patent: 4124566 (1978-11-01), Saiki et al.

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