Method for preparing cyclic polycarbonate oligomers

Details Method for preparing cyclic polycarbonate oligomers Method for preparing cyclic polycarbonate oligomers

1987-12-22

1989-03-21

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...

526 65, 528196, 528370, C08G 6362

Patent

active

048144290

ABSTRACT:
Cyclic polycarbonate oligomers are prepared by the reaction of a bisphenol bischloroformate (e.g. bisphenol A bischloroformate) with an amine (e.g., triethylamine) and an alkali or alkaline earth metal hydroxide in at least two back-mixed vessels and in a mixed aqueous-organic system. The liquid contents of each vessel except the last are passed to the next vessel and each vessel is simultaneously charged with reactants, with the concentration of carbonate units in the reactants being less in the first vessel than in subsequent vessels. By this method, there is obtained a cyclic product containing a minimum proportion of linear polycarbonates.

REFERENCES:
patent: 4616077 (1986-10-01), Silva
patent: 4727134 (1988-02-01), Brunelle et al.

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