Method for preparing polycarbonates of controlled molecular weig

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

1989-07-20

1990-11-27

Anderson, Harold D.

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

Synthetic resins

From reactant having a halogen atom or oxygen single bonded...

528372, C08G 6420

Patent

active

049736647

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.

REFERENCES:
patent: 4737573 (1988-04-01), Silva et al.
patent: 4743676 (1988-05-01), Silva et al.

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