PRODUCTION OF HIGH MOLECULAR WEIGHT POLYHALOBISPHENOL POLYCARBONATES

摘要

This invention relates to high molecular weight polyhalobisphenol polycarbonates which are produced by adding phosgene to a polyhalobisphenol in the alkali metal phenate form whereby the chloroformates of the bisphenol are formed and then adding an activated pyridine such as 4-aminoyridines or 2-substituted pyrldines to generate a high molecular weight palycarbonate having an inherent viscosity in the range from about 0.4 to about 0.9. These high molecular weight polycarbonates have high glass transition temperatures, good solvent and fire resistance and good hydrolytic stability. These polycarbonates are suitable for use in preparing hollow fibers for gas separations. 35,275-F