Process for producing a polycarbonate

Details Process for producing a polycarbonate Process for producing a polycarbonate

1997-09-24

1999-07-13

Mosley, Terressa

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

560190, C08G 6400

Patent

active

059228270

ABSTRACT:
A diaryl carbonate is produced by decarbonylating a diaryl oxalate, which can be prepared by transesterification of a dialkyl oxalate with a hydroxyaryl compound, in the presence of a catalyst, while removing the resultant carbon monoxide as a by-product, and then optionally refined by an evaporation and/or distillation, and then the resultant diaryl carbonate is condensation-polymerized with a polyhydroxyl compound, while recovering a resultant hydroxyaryl compound from the reaction system, to produce a polycarbonate.

REFERENCES:
patent: 4012406 (1977-03-01), Buysch et al.
patent: 4544507 (1985-10-01), Foley
patent: 5210268 (1993-05-01), Fukuoka et al.
patent: 5648510 (1997-07-01), Harada et al.
"Thermodecomposition of Diphenylesters of Dicarboxylic Acids, Second Report", Organic Synthetic Chemistry, vol. 5, Report 47, pp. 70-71 (1948).

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