Process for preparing low color polyarylates

Details Process for preparing low color polyarylates Process for preparing low color polyarylates

1989-05-25

1990-09-25

Anderson, Harold D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

524599, 524845, 528179, 528180, 528181, 528272, C08G 6300, C08G 6302

Patent

active

049594494

ABSTRACT:
Polyarylates formed by reacting the diester of a dihydric phenol such as bisphenol-A and at least one aromatic dicarboxylic acid in the presence of an esterification catalyst is provided with improved color by the addition of cobalt during polymerization. The amount of cobalt can be reduced and an additional amount of an ultramarine blue pigment can be added to the reaction mixture to maintain the color improvement.

REFERENCES:
patent: 4499226 (1985-02-01), Massey et al.
patent: 4835243 (1989-05-01), Eckhardt et al.

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