Method for preparing linear polycarbonate from cyclic oligomer w

Details Method for preparing linear polycarbonate from cyclic oligomer w Method for preparing linear polycarbonate from cyclic oligomer w

1985-04-16

1986-08-12

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...

528196, 528370, 528377, 528378, 528379, C08G 6362

Patent

active

046057315

ABSTRACT:
Cyclic polycarbonate oligomers are converted to linear polycarbonate resins by heating with a polycarbonate formation catalyst which generates aryl carbanions at temperatures up to about 300.degree. C. The preferred catalysts are tetraarylborates such as tetramethylammonium tetraphenylborate.

REFERENCES:
patent: 3220980 (1965-11-01), Prochaska
patent: 3274214 (1966-09-01), Prochaska
patent: 3386954 (1968-06-01), Schnell et al.
patent: 3442854 (1969-05-01), Curtius et al.

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