PROCESS FOR PREPARING POLYARYLATES

12,785 PROCESS FOR PREPARING POLYARYLATES 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 w...

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Hauptverfasser:	MATZNER, MARKUS, BERGER, MITCHELL H, TIBBITT, JAMES M
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP
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Zusammenfassung:	12,785 PROCESS FOR PREPARING POLYARYLATES 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.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 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