Bimetallic zinc complex and process of producing...

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate

Reexamination Certificate

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C424S063000, C424S094620, C435S006120, C514S006900, C524S104000, C568S583000, C568S587000

Reexamination Certificate

active

11088806

ABSTRACT:
Provided are a bimetallic zinc complex and a method of producing polycarbonate, including polymerizing an epoxy compound and carbon dioxide using the bimetallic zinc complex. The bimetallic zinc complex according to the present invention has a distance between zinc-zinc atoms, which is maintained in a limited range regardless of its concentration in a reaction medium for the polymerization. Thus, the bimetallic zinc complex can have a polymerization activity even at a high ratio of monomer/catalyst, thereby reducing a catalyst amount to be used, which is economically advantageous. Further, the bimetallic zinc complex can produce a high molecular weight polycarbonate.

REFERENCES:
patent: 6133402 (2000-10-01), Coates et al.
patent: 6610889 (2003-08-01), Trost et al.
Angew. Chem. Int. Ed. 2002, 41, No. 14 (2002) “Electronic and Steric Effects on Catalysts for CO2/ Epoxide Polymerization: Subtle Modifications Resulting in Superior Activites”; David Moore, et al.
The Royal Society of Chemistry(2001) “Polymer Supported Chromium Porphyrin As Catalyst for Polycarbonate Formation in Supercritical Carbon Dioxide” Louise M. Stamp, et al.
American Chemical Society(1983) “Activation of Carbon Dioxide with Aluminum Porphyrin and Reaction with Epoxide. Studies on(Tetraphenylporphinato)Aluminum Alkoxide Having a Long Oxyalkylene Chain as the Alkoxide Group” Takuzo Aida, et al.
American Chemical Society (1998) “Catalytic Reactions Involving C1Feedstocks: New High-Activity Zn(II)-Based Catalysts for the Alternating Copolymerization of Carbon Dioxide and Epoxides” Ming Cheng, et al.
American Chemical Society (2001) “Single-Site B-Diiminate Zinc Catalysts for the Alternating Copolymerization of CO2and Epoxides: Catalyst Synthesis and Unprecedented Polymerization Activity” Ming Cheng, et al.
J. AM. Chem. Soc. (2002) “Mechanistic Aspects of the Copolymerization Reaction of Carbon Dioxide and Epoxides, Using a Chiral Salen Chromium Chloride Catalyst” Donald J. Darensbourg, et al.
J. AM. Chem. Soc. (2003) “Mechanism of the Alternating Copolymerization of Epoxides and CO2Using B-Diiminate Zinc Catalysts: Evidence for a Bimetallic Epoxide Enchainment” David R. Moore, et al.
American Chemical Society(1995) “Catalytic Formation of Cyclic Carbonates from Epoxides and CO2with Chromium Metalloporphyrinates” William J. Kruper, et al.
American Chemical Society(1995) “Catalytic Activity of Zinc(II)Phenoxides Which Possess Readily Accessible Coordination Sites. Copolymerization and Terpolymerization of Epoxides and Carbon Dioxide” Donald Darensbourg, et al.
American Chemical Society (1997)“Copolymerization of 1, 2-Epoxycyclohexane and Carbon Dioxide Using Carbon Dioxide as Both Reactant and Solvent” Michael Super, et al.
American Chemical Society(2000) “Copolymerization of CO2and 1,2-Cyclohexene Oxide Using a CO2-Soluble Chromium Porphyrin Catalyst” Stephen Mang, et al.
The British Library (1969) “Copolymerization of Carbon Dioxide and Epoxide”.

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