Process for preparing polyarylates

Details Process for preparing polyarylates Process for preparing polyarylates

1980-05-05

1982-02-02

Welsh, Maurice J.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528125, 528126, 528128, 528173, 528194, 528206, 528207, 528222, 528225, 528271, C08G 6300

Patent

active

043140513

ABSTRACT:
Described herein is a process for preparing crystalline polyarylates which comprises (a) forming a crystalline polyarylate prepolymer having a reduced viscosity of from 0.05 to about 0.4 dl/g by reacting at least one diester derivative of a dihydric phenol with at least one aromatic dicarboxylic acid in the presence of a solvent, at a temperature of from about 250.degree. to about 300.degree. C., and (b) heating the prepolymer so formed below its melting point to form a crystalline polyarylate having a reduced viscosity of from about 0.45 to about 1.2 dl/g.

REFERENCES:
patent: 3684766 (1972-08-01), Jackson et al.
patent: 3780148 (1973-12-01), Jackson et al.
patent: 4075173 (1978-02-01), Muruyama et al.

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