Process for producing a branched polycarbonate

Details Process for producing a branched polycarbonate Process for producing a branched polycarbonate

1994-10-05

1995-12-05

Seidleck, James J.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528196, C08G 6400

Patent

active

054730465

ABSTRACT:
A process for producing a branched polycarbonate which comprises using a branching agent containing 200 ppm or less of sulfur; a branched polycarbonate which is prepared by the interfacial method and contains 1.0 ppm or less of residual sulfur as an impurity; and a branched polycarbonate which is prepared by the melting method and contains 2.0 ppm or less of residual sulfur as an impurity; are provided. When the branched polycarbonate is produced by the interfacial method, the branched polycarbonate produced does not show deterioration in heat stability or cause mold corrosion. When the branched polycarbonate is produced by the melting method, the branched polycarbonate produced does not show deterioration in heat stability or in color tone.

REFERENCES:
patent: Re27682 (1973-06-01), Schnell et al.
patent: 4415723 (1983-11-01), Hedges et al.
patent: 4426513 (1984-01-01), Mark
patent: 4446298 (1984-05-01), Mark et al.

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