Process for preparing polyarylates

Details Process for preparing polyarylates Process for preparing polyarylates

C - Chemistry, Metallurgy

08

G

402/187, 402/33

C08G 63/18 (2006.01) C08G 63/19 (2006.01) C08G 63/66 (2006.01) C08G 63/68 (2006.01) C08G 63/80 (2006.01)

Patent

CA 1168797

12,785 PROCESS FOR PREPARING POLYARYLATES ABSTRACT OF THE DISCLOSURE 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 dicarboxyiic acid in the presence of a solvent, at a temperature of from about 250° to about 300°C, and (b) heating the prepolymer so formed below its melting point to form a crystalline polyarylate having a reduced ivcosity of from about 0.45 to about 1.2 dl/g. S P E C I F I C A T I O N

376607

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