Patents Assigned to Chevron Phillips Chemical Company, LLP
  • Multiple reactor and multiple zone polyolefin polymerization
    Patent number: 10703832
    Abstract: Apparatuses and processes that produce multimodal polyolefins, and in particular, polyethylene resins, are disclosed herein. This is accomplished by using two reactors in series, where one of the reactors is a multi-zone circulating reactor that can circulate polyolefin particles through two polymerization zones optionally having two different flow regimes so that the final multimodal polyolefin has improved product properties and improved product homogeneity.
    Type: Grant
    Filed: August 12, 2019
    Date of Patent: July 7, 2020
    Assignee: Chevron Phillips Chemical Company LLP
    Inventors: Joseph A. Curren, Rebecca A. Gonzales, Scott E. Kufeld, Joel A. Mutchler, Eric J. Netemeyer, Jamie N. Sutherland, Paul J. DesLauriers, Jeffrey S. Fodor
  • Organochromium/metallocene combination catalysts for producing bimodal resins
    Patent number: 7163906
    Abstract: This invention relates to the field of olefin polymerization catalyst compositions, and methods for the polymerization and copolymerization of olefins, including polymerization methods using a supported catalyst composition. In one aspect, the present invention encompasses a catalyst composition comprising the contact product of at least one metallocene compound, at least one organochromium compound, at least one chemically-treated solid oxide, and at least one organoaluminum compound.
    Type: Grant
    Filed: November 4, 2004
    Date of Patent: January 16, 2007
    Assignee: Chevron Phillips Chemical Company, LLP
    Inventors: Max P. McDaniel, Elizabeth A. Benham, Michael D. Jensen, Kathy S. Collins, Joel L. Martin, Gil R. Hawley