Patents Examined by MLousia Lao
  • Polycarbonates made using highly selective catalysts
    Patent number: 7304172
    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%.
    Type: Grant
    Filed: October 6, 2005
    Date of Patent: December 4, 2007
    Assignee: Cornell Research Foundation, Inc.
    Inventors: Geoffrey W. Coates, Zengquan Qin, Claire Tova Cohen