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US 8,633,123 B2Granted
Catalysts and methods for polymer synthesis
AssigneeNovomer, Inc.
InventorsScott D. Allen, Anna E. Cherian, Chris A. Simoneau, Jay J. Farmer, Geoffrey W. Coates, Alexei Gridnev, Robert E. LaPointe
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Abstract
The present invention provides unimolecular metal complexes having increased activity in the copolymerization of carbon dioxide and epoxides. Also provided are methods of using such metal complexes in the synthesis of polymers. According to one aspect, the present invention provides metal complexes comprising an activating species with co-catalytic activity tethered to a multidentate ligand that is coordinated to the active metal center of the complex.
Claims25
A metal complex of the formula:
- wherein:
- M is cobalt;
- comprises a salen ligand;
- and
- (Z)m represents one or more activating moieties tethered to the salen ligand, where represents a linker moiety;
- m represents the number of Z groups present on a linker moiety and is an integer between 1 and 4 inclusive;
- and each (Z) represents an activating moiety comprising a guanidine group.
4 more elements
Dependencies are inferred from the claim text.