Patents by Inventor Karen Breetz

Karen Breetz 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).

  • Chromium-based catalysts in mineral oil for production of polyethylene
    Publication number: 20060155081
    Abstract: A process for polymerizing polyethylene with chromium-based catalysts wherein one or more supported chromium-based catalysts is mixed with mineral oil to form a slurry and the slurry is then introduced into a polymerization reactor, especially a gas-phase polymerization reactor.
    Type: Application
    Filed: March 4, 2004
    Publication date: July 13, 2006
    Inventors: Robert Jorgensen, Karen Breetz, Jose Cevallos-Candau, Dale Wright, Thomas Spriggs
  • Blow molding resins with improved ESCR
    Patent number: 6982304
    Abstract: Polyethylene resins having improved environmental stress crack resistance, stiffness and impact resistance is made by a process comprising feeding both a chromium oxide catalyst and a silyl chromium catalyst into a polymerization reactor. The chromium oxide catalyst and the silyl chromium catalyst are on separate supports. The chromium oxide catalyst is 25–50 weight percent and the silyl chromium catalyst is 50–75 weight percent of the total weight of catalyst. The catalysts may be added separately or as a single mixture.
    Type: Grant
    Filed: December 22, 2003
    Date of Patent: January 3, 2006
    Assignee: Union Carbide Chemicals & Plastics Technology Corporation
    Inventors: Cliff Robert Mure, Guylaine St. Jean, Stephen Paul Jaker, Robert J. Jorgensen, Karen Breetz
  • BLOW MOLDING RESINS WITH IMPROVED ESCR
    Publication number: 20050137365
    Abstract: Polyethylene resins having improved environmental stress crack resistance, stiffness and impact resistance is made by a process comprising feeding both a chromium oxide catalyst and a silyl chromium catalyst into a polymerization reactor. The chromium oxide catalyst and the silyl chromium catalyst are on separate supports. The chromium oxide catalyst is 25-50 weight percent and the silyl chromium catalyst is 50-75 weight percent of the total weight of catalyst. The catalysts may be added separately or as a single mixture.
    Type: Application
    Filed: December 22, 2003
    Publication date: June 23, 2005
    Inventors: Cliff Mure, Guylaine St. Jean, Stephen Jaker, Robert Jorgensen, Karen Breetz