Process for preparing polyarylates

A process for preparing polyarylate having a reduced viscosity of from about 0.5 to greater than 1.0 dl/gm comprises the following steps: (a) reacting an acid anhydride derived from an aliphatic monocarboxylic acid containing from 2 to 8 carbon atoms with at least one dihydric phenol to form the cor...

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Bibliographic Details
Main Authors STEINER; ULRICH A, SEE; BENITO
Format Patent
LanguageEnglish
Published 18.09.1990
Subjects
CHEMISTRY
COMPOSITIONS BASED THEREON
MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
SEPARATION
THEIR PREPARATION OR CHEMICAL WORKING-UP
TRANSPORTING
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Summary:A process for preparing polyarylate having a reduced viscosity of from about 0.5 to greater than 1.0 dl/gm comprises the following steps: (a) reacting an acid anhydride derived from an aliphatic monocarboxylic acid containing from 2 to 8 carbon atoms with at least one dihydric phenol to form the corresponding diester; (b) after forming the diester, removing by vacuum distillation the bulk of the residual acid anhydride, then adding acetic acid, then vacuum distilling to bring the anhydride concentration to a level low enough to enable the formation of a polymer having a low color and good thermal stability; and (c) reacting said diester with at least one aromatic dicarboxylic acid at a temperature sufficient to form the polyarylate. Polyarylates made by the process are improved in respect of melt stability and low color.
Bibliography:Application Number: US19890354827