Method for preparing polycarbonates of controlled molecular...

Details Method for preparing polycarbonates of controlled molecular... Method for preparing polycarbonates of controlled molecular...

C - Chemistry, Metallurgy

08

G

402/172

C08G 64/22 (2006.01) C08G 64/26 (2006.01)

Patent

CA 2012813

RD-18713 METHOD FOR PREPARING POLYCARBONATES OF CONTROLLED MOLECULAR WEIGHT FROM BISCHLOROFORMATES Abstract Aromatic polycarbonates having a predetermined relatively low weight average molecular weight, as well as a low molecular weight distribution, are prepared by partially capping an aromatic bischloroformate composition, preferably a bisphenol A bischloroformate composition, with a monohydroxyaromatic compound and subsequently converting the partially capped composition to a polycarbonate, using a base which provides a buffered pH in the range of about 12-13. The preferred base is calcium hydroxide, which is soluble in water in precisely the amount required to provide the desired pH.

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