Patents Assigned to Chevron Phillips Company, L.P.
  • Dual metallocene catalysts for polymerization of bimodal polymers
    Patent number: 8268944
    Abstract: This invention relates to catalyst compositions, methods, and polymers encompassing at least one first Group 4 metallocene compound comprising bridging ?5-cyclopentadienyl-type ligands, in combination with at least one second Group 4 metallocene with non-bridging ?5-cyclopentadienyl-type ligands, typically in combination with at least one cocatalyst, and at least one activator. The compositions and methods disclosed herein provide ethylene polymers with a bimodal molecular weight distribution.
    Type: Grant
    Filed: February 15, 2012
    Date of Patent: September 18, 2012
    Assignee: Chevron Phillips Company, L.P.
    Inventors: Qing Yang, Kumudini C. Jayaratne, Michael D. Jensen, Max P. McDaniel, Joel L. Martin, Matthew G. Thorn, Jerry T. Lanier, Tony R. Crain