Process for efficient phosgene usage in the preparation of polyc

Details Process for efficient phosgene usage in the preparation of polyc Process for efficient phosgene usage in the preparation of polyc

1993-09-17

1995-05-16

Kight, III, John

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528198, 528199, C08G 6400

Patent

active

054161851

ABSTRACT:
A method for producing polycarbonates by the interfacial reaction of phosgene bisphenol in a two phase reaction medium of an aqueous hydroxide and an organic solvent is disclosed. In the reaction, the amount of water in the reaction medium is controlled such that high ionic strength conditions resulting from high salt concentrations are reached at the end of phosgenation and the pH of the medium is controlled to a range between 8 and 10 whereby excess phosgene usage is less than about 15% of theoretical conditions.

REFERENCES:
patent: 4367330 (1983-01-01), Hucks et al.
patent: 5011966 (1991-08-01), Silva et al.
patent: 5043203 (1991-04-01), Fyvie et al.
patent: 5300624 (1994-04-01), Boden et al.

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