Process for producing aromatic polycarbonate

Details Process for producing aromatic polycarbonate Process for producing aromatic polycarbonate

1995-02-09

1996-06-18

Seidleck, James J.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528198, 528200, 528204, 502150, 502152, 502157, 502164, 502171, C08G 6400

Patent

active

055278752

ABSTRACT:
A process for producing an aromatic polycarbonate having a weight average molecular weight of from 7,000 to 60,000 is disclosed, comprising melt polycondensing an aromatic diol compound (e.g., bisphenol A) and a diaryl carbonate compound (e.g., diphenyl carbonate) in the presence of a combination of (a) an alkali metal compound and (b) a phosphonium hydroxide compound (e.g., tetraethylphosphonium hydroxide) as an interesterification catalyst. The aromatic polycarbonate has improved heat resistance and hue.

REFERENCES:
patent: 4310656 (1982-01-01), Brunelle
patent: 4330664 (1982-05-01), Brunelle
patent: 4363905 (1982-12-01), Brunelle
patent: 5221761 (1993-06-01), Jen et al.
Database WPI Week 9441, Derwent Publication Ltd., London, GB; AN 94-330153 & JP-A-6,256,497 (Teijin Ltd.), 13 Sep. 1994.
Chemical Abstracts, vol. 122, No. 16, 17 Apr. 1995, Columbus, Ohio, U.S.; Abstract No. 188437 & JP-A-6,329,783 (Teijin Ltd.) 29 Nov. 1994.
Database WPI Week 8813, Derwent Publications Ltd., London, GB; AN 88-087241 & JP-A-63,037,120 (Teijin KK) 17 Feb. 1988.

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