Polycarbonates made using highly selective catalysts

Details Polycarbonates made using highly selective catalysts Polycarbonates made using highly selective catalysts

2007-12-04

2007-12-04

Eyler, Yvonne (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heavy metal containing

Reexamination Certificate

active

11244231

ABSTRACT:
Poly(propylene carbonates) are prepared from propylene oxide and CO2with less than 10% cyclic propylene carbonate by product using cobalt based catalysts of structurepreferably in combination with salt cocatalyst, very preferably cocatalyst where the cation is PPN+and the anion is Cl−or OBzF5−. Novel products include poly(propylene carbonates) having a stereoregularity greater than 90% and/or a regioregularity of greater than 90%.

REFERENCES:
patent: 6720434 (2004-04-01), Kim et al.
Lu, X.-B., et al., J. Am. Chem. Soc., “Design of Highly Active Binary Catalyst Systems for CO2/ Epoxide Copolymerization: Polymer Selectivity, Enantioselectivity, and Stereochemistry Control”, published on Web. Jan. 12, 2006.
Qin, Z., et al., “Cobalt-Based Complexes for the Copolymerization of Propylene Oxide and Co2: Active and Selective Catalysts for Polycarbonate Synthesis”, Angew. Chem. Int. Ed. 42, 5484-5487 (published online Oct. 20, 2003) and supporting information.
Lu, X.-B., et al., “Highly Active, Binary Catalyst Systems for the Alternating Copolymerization of CO2and Epoxides under Mild Conditions”, Angew. Chem. Int. Ed. 43, 3574-3577 (Jul. 5, 2004).
Paddock, R. L., et al., “Alternating Copolymerization of CO2and Propylene Oxide Catalyzed by CoIII(salen)/Lewis Base”, Macromolecules 38, 6251-6253 (Published online Jun. 30, 2005).

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