Patents by Inventor Ping P. Cai

Ping P. Cai has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Gas-phase polymerization process to achieve a high particle density
    Patent number: 7714082
    Abstract: A process for increasing a granular particle density of a polymeric product using at least one particle density promoting agent is described. The process includes passing a gaseous stream comprising at least one monomer through a fluidized bed reactor in the presence of a catalyst to form a polymeric product having a first granular particle density of less than or equal to about 850 kg/m3, contacting the polymeric product with at least one particle density promoting agent to increase the granular particle density of the polymeric product by at least 2%, withdrawing the polymeric product having an increased granular particle density and a recycle stream comprised of unreacted monomers, and cooling and reintroducing the recycle stream into the fluidized bed reactor with sufficient additional monomer to replace the monomer polymerized and withdrawn as the polymeric product.
    Type: Grant
    Filed: October 4, 2005
    Date of Patent: May 11, 2010
    Assignee: Univation Technologies, LLC
    Inventors: Ping P. Cai, William A. Matthews
  • Processes for transitioning between various polymerization catalysts
    Patent number: 6858684
    Abstract: This invention relates to processes for transitioning among polymerization catalyst systems, preferably catalyst systems, which are incompatible with each other. Particularly, the invention relates to processes for transitioning among olefin polymerization reactions utilizing Ziegler-Natta catalyst systems, metallocene catalyst systems and chromium-based catalyst systems.
    Type: Grant
    Filed: November 17, 2003
    Date of Patent: February 22, 2005
    Assignee: Univation Technologies, LLC
    Inventors: Ian D. Burdett, Ping P. Cai, Ronald Steven Eisinger, Mark Gregory Goode, F. David Hussein, Michael Allen Kinnan, Michael Elroy Muhle, James L. Swecker, II
  • Processes for transitioning between various polymerization catalysts
    Publication number: 20040138391
    Abstract: This invention relates to processes for transitioning among polymerization catalyst systems, preferably catalyst systems, which are incompatible with each other. Particularly, the invention relates to processes for transitioning among olefin polymerization reactions utilizing Ziegler-Natta catalyst systems, metallocene catalyst systems and chromium-based catalyst systems.
    Type: Application
    Filed: November 17, 2003
    Publication date: July 15, 2004
    Inventors: Ian D. Burdett, Ping P. Cai, Ronald Steven Eisinger, Mark Gregory Goode, F. David Hussein, Michael Allen Kinnan, Michael Elroy Muhle, James L. Swecker