Polycarbonates made using high activity catalysts

Details Polycarbonates made using high activity catalysts Polycarbonates made using high activity catalysts

1999-06-09

2000-10-17

Boykin, Terressa M.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528296, C08G 6302

Patent

active

061334022

ABSTRACT:
Polycarbonates having M.sub.n ranging from about 5,000 to about 40,000 and a molecular weight distribution ranging from 1.05 to 2.0 are prepared from epoxides and CO.sub.2 using a catalyst which has a Zn center and two ligands where one of the ligands is a propagating group and the other of the ligands is not a propagating group and an activity of at least one turnover per hour, preferably at least 100 turnovers per hour. Preferred catalysts have a ##STR1## moiety with group on each nitrogen containing a phenyl moiety.

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