Method for making end-capped polycarbonates from bisphenol...

Details Method for making end-capped polycarbonates from bisphenol... Method for making end-capped polycarbonates from bisphenol...

C - Chemistry, Metallurgy

08

G

402/174

C08G 64/14 (2006.01) C08G 64/20 (2006.01)

Patent

CA 2039834

RD-19,636 A METHOD FOR MAKING END CAPPED POLYCARBONATES FROM BISPHENOL MONOCHLOROFORMATE POLYCARBONATE OLIGOMERS Abstract of the Disclosure Aromatic polycarbonates are prepared by initially phogenating a mixture of bisphenol and aqueous alkali metal hydroxide under interfacial reaction conditions to form an oligomeric bisphenol monochloroformate followed by the further introduction of phosgene and base and thereafter the elimination of reacted phosgene and the incorporation or endcapping phenol and tertiary organic amine and additional alkali metal hydroxide into the mixture. Reduced phosgene 2. usage, the substantial elimination of emulsion formation, increased pH measurement accuracy and avoidance of production of diarylcarbonates are substantially provided.

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