PROCESS FOR PREPARING POLYARYLATES

IMPROVED PROCESS FOR PREPARING POLYARYLATES Described herein is an improved process for preparing a polyarylate having a reduced viscosity of from about 0.5 to greater than 1.0 dl/gm which process comprises the following steps: a) reacting an acid anhydride derived from an acid containing from 2 to...

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Bibliographic Details
Main Authors MATZNER, MARKUS, SEE, BENITO, MARESCA, LOUIS M
Format Patent
LanguageEnglish
French
Published 04.09.1984
Edition3
Subjects
CHEMISTRY
COMPOSITIONS BASED THEREON
COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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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Summary:IMPROVED PROCESS FOR PREPARING POLYARYLATES Described herein is an improved process for preparing a polyarylate having a reduced viscosity of from about 0.5 to greater than 1.0 dl/gm which process comprises the following steps: a) reacting an acid anhydride derived from an acid containing from 2 to 8 carbon atoms with at least one dihydric phenol to form the corresponding diester; and (b) reacting said diester with at least one aromatic dicarboxylic acid at a temperature sufficient to form the polyarylate. wherein the improvement comprises removing residual acid anhydride, after formation of the dihydric phenol diester. so that its concentration is less than about 1500 parts per million. The novel polyarylates produced by the improved process of this invention are melt stable and low in color. S P E C I F I C A T I 0 N D-12,857
Bibliography:Application Number: CA19810383868