Process for preparing polyarylates

Details Process for preparing polyarylates Process for preparing polyarylates

C - Chemistry, Metallurgy

08

G

402/202, 402/33

C08G 63/78 (2006.01) C08G 63/181 (2006.01) C08G 63/19 (2006.01)

Patent

CA 2016743

ABSTRACT Described herein is a process for preparing a poly- arylate having a reduced viscosity of from about 0.5 to greater than 1.0 dl/gm which process comprises the follow- ing 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.

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