Methods for polymer synthesis
First Claim
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1. A method for preparing aliphatic polycarbonate polymers comprising the step of contacting one or more epoxides with a first catalyst capable of catalyzing the hydrolysis of epoxides and a second catalyst capable of catalyzing the copolymerization of epoxides and CO2;
- wherein the first catalyst comprises a transition metal complex; and
the second catalyst comprises a metal-ligand complex.
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Abstract
The present invention provides methods for reducing induction periods in epoxide-CO2 copolymerizations. In certain embodiments, the methods include the step of contacting an epoxide with CO2 in the presence of two catalysts: an epoxide hydrolysis catalyst and an epoxide CO2 copolymerization catalyst. In another aspect, the invention provides catalyst compositions comprising a mixture of an epoxide hydrolysis catalyst and an epoxide CO2 copolymerization catalyst.
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Citations
15 Claims
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1. A method for preparing aliphatic polycarbonate polymers comprising the step of contacting one or more epoxides with a first catalyst capable of catalyzing the hydrolysis of epoxides and a second catalyst capable of catalyzing the copolymerization of epoxides and CO2;
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wherein the first catalyst comprises a transition metal complex; and the second catalyst comprises a metal-ligand complex. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 14, 15)
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9. A method for the copolymerization of one or more epoxides and CO2 to produce aliphatic polycarbonate polymers, the method comprising the steps of:
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treating an epoxide feedstock comprising one or more epoxides by contacting it with a first catalyst capable of catalyzing epoxide hydrolysis and optionally a second catalyst capable of catalyzing epoxide CO2 copolymerization; and feeding the treated epoxide feedstock to an epoxide CO2 copolymerization reaction where it is contacted with CO2 in the presence of the second catalyst capable of catalyzing epoxide CO2 copolymerization; wherein the first catalyst comprises a transition metal complex; and the second catalyst comprises a metal-ligand complex. - View Dependent Claims (10, 11, 12, 13)
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Specification