Polycarbonates made using highly selective catalysts
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Accused Products
Abstract
Poly(propylene carbonates) are prepared from propylene oxide and CO2 with less than 10% cyclic propylene carbonate by product using cobalt based catalysts of structure
preferably 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%.
36 Citations
12 Claims
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1-4. -4. (canceled)
- 5. A catalyst system for epoxide/CO2 copolymerization comprising as a catalyst
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12-24. -24. (canceled)
Specification