Method for controlling polymerization rate of cyclic polycarbona

Details Method for controlling polymerization rate of cyclic polycarbona Method for controlling polymerization rate of cyclic polycarbona

1985-07-18

1987-03-17

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, 528198, 528199, 528200, 528370, C08G 6362

Patent

active

046508520

ABSTRACT:
Cyclic polycarbonate oligomers are polymerized to linear polycarbonates by contact with a polycarbonate formation catalyst which has been modified by contacting the same with at least one diaryl carbonate, preferably diphenyl carbonate. Said modification decreases the polymerization rate or introduces an induction period into the polymerization reaction.

REFERENCES:
patent: 3386954 (1968-06-01), Schnell et al.

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