Method for polymerizing cyclic polycarbonate oligomers with cata

Details Method for polymerizing cyclic polycarbonate oligomers with cata Method for polymerizing cyclic polycarbonate oligomers with cata

1986-12-15

1987-10-20

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...

525462, 528196, 528370, C08G 6362

Patent

active

047015195

ABSTRACT:
Cyclic polycarbonate oligomers are polymerized to linear polycarbonates by contact with a catalyst comprising a polymer containing alkali metal phenoxide moieties. Said polymer is preferably a polycarbonate and the alkali metal is preferably lithium. The catalyst polymer may be prepared by the reaction of a polymer with phenolic moieties with an alkali metal base such as lithium phenoxide at a temperature in the range of about 200.degree.-300.degree. C.

REFERENCES:
patent: 3155683 (1964-11-01), Moody
patent: 4605731 (1986-08-01), Evans et al.
patent: 4644053 (1987-02-01), Brunelle et al.
patent: 4650852 (1987-03-01), Evans et al.

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