Search International and National Patent Collections

1. (WO2001025310) ALKALI METAL SALTS OF OXOACIDS OF SULFUR AS CATALYSTS FOR THE PREPARATION OF POLYCARBONATES

Pub. No.:    WO/2001/025310    International Application No.:    PCT/US2000/024740
Publication Date: Apr 12, 2001 International Filing Date: Sep 11, 2000
IPC: C08G 64/30
Applicants: GENERAL ELECTRIC COMPANY
Inventors: McCLOSKEY, Patrick, Joseph
BURNELL, Timothy, Brydon
SMIGELSKI, Paul, Michael, Jr.
Title: ALKALI METAL SALTS OF OXOACIDS OF SULFUR AS CATALYSTS FOR THE PREPARATION OF POLYCARBONATES
Abstract:
The present invention relates to a method for the preparation of polycarbonate comprising preparing a polycarbonate by a melt process by reacting a diphenol and a diaryl carbonate in the presence of a catalytically effective amount of one or more alkali metal salts of oxoacids of sulfur, like sodium metabisulfite, bisulfite, sulfite, dithionate or thiosulfate.