Copolymerization of propylene oxide and carbon dioxide without production of propylene carbonate
AssigneeCornell Research Foundation, Inc.
InventorsGeoffrey W. Coates, Stephen Lee, Zengquan Qin, Nicholas J. Robertson
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Abstract
Copolymers of propylene oxide and carbon dioxide and homopolymers of propylene oxide are made using two dimensional double metal cyanide complexes having the formula Co[M(CN)4] or hydrated or partially dehydrated form thereof. There is no propylene carbonate by product in the copolymerization.
Claims30
A method for the non-alternating copolymerization of rac-propylene oxide or enantiomerically enriched propylene oxide and carbon dioxide to produce:
- without the formation of propylene carbonate;
- wherein where x ranges from 1.0 to 0.46 and Mn ranges from 500 to 500,000 g/mol, said method comprising the step of copolymerizing rac-propylene oxide or enantiomerically enriched propylene oxide and carbon dioxide in the presence of a catalytically effective amount of a double metal cyanide complex containing a tetracyanometallate moiety.
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A method for non-alternating copolymerization of
- wherein R in (I) is selected from the group consisting of hydrogen, C2-C18-alkyl, C6-C18-aryl, C1-C20 halide-containing alkyl, and C1-C20 oxygen-containing alkyl, and carbon dioxide (II),
- without the formation of cyclic carbonate;
- comprising the step of copolymerizing (I) and (II) in the presence of a catalytically effective amount of a double metal cyanide complex containing a tetracyanometallate moiety, wherein the double metal cyanide complex is Co[M(CN)4], wherein M is selected from the group consisting of Ni, Pd, Pt, and combinations thereof, to produce polyether-polycarbonate having the formula
- wherein x ranges from 1.0 to 0.46 and Mn of (III) ranges from 500 to 500,000 g/mol.
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Dependencies are inferred from the claim text.