Patents by Inventor Kumudini C Jayaratne

Kumudini C Jayaratne 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).

  • Dual metallocene catalyst systems for decreasing melt index and increasing polymer production rates
    Patent number: 9169333
    Abstract: The present invention provides dual catalyst systems and polymerization processes employing these dual catalyst systems. The disclosed polymerization processes can produce olefin polymers at higher production rates, and these olefin polymers may have a higher molecular weight and/or a lower melt index.
    Type: Grant
    Filed: April 29, 2014
    Date of Patent: October 27, 2015
    Assignee: Chevron Phillips Chemical Company LP
    Inventors: Albert P. Masino, Rex E. Murray, Qing Yang, Steve J. Secora, Kumudini C. Jayaratne, William B. Beaulieu, Errun Ding, Gary L. Glass, Alan L. Solenberger, Ted H. Cymbaluk
  • Dual Metallocene Catalyst Systems for Decreasing Melt Index and Increasing Polymer Production Rates
    Publication number: 20140235804
    Abstract: The present invention provides dual catalyst systems and polymerization processes employing these dual catalyst systems. The disclosed polymerization processes can produce olefin polymers at higher production rates, and these olefin polymers may have a higher molecular weight and/or a lower melt index.
    Type: Application
    Filed: April 29, 2014
    Publication date: August 21, 2014
    Applicant: Chevron Phillips Chemical Company LP
    Inventors: Albert P. Masino, Rex E. Murray, Qing Yang, Steve J. Secora, Kumudini C. Jayaratne, William B. Beaulieu, Errun Ding, Gary L. Glass, Alan L. Solenberger, Ted H. Cymbaluk
  • Dual metallocene catalyst systems for decreasing melt index and increasing polymer production rates
    Patent number: 8748546
    Abstract: The present invention provides dual catalyst systems and polymerization processes employing these dual catalyst systems. The disclosed polymerization processes can produce olefin polymers at higher production rates, and these olefin polymers may have a higher molecular weight and/or a lower melt index.
    Type: Grant
    Filed: May 7, 2013
    Date of Patent: June 10, 2014
    Assignee: Chevron Phillips Chemical Company LP
    Inventors: Albert P. Masino, Rex E. Murray, Qing Yang, Steve J. Secora, Kumudini C. Jayaratne, William B. Beaulieu, Errun Ding, Gary L. Glass, Alan L. Solenberger, Ted H. Cymbaluk
  • Dual Metallocene Catalyst Systems for Decreasing Melt Index and Increasing Polymer Production Rates
    Publication number: 20130245210
    Abstract: The present invention provides dual catalyst systems and polymerization processes employing these dual catalyst systems. The disclosed polymerization processes can produce olefin polymers at higher production rates, and these olefin polymers may have a higher molecular weight and/or a lower melt index.
    Type: Application
    Filed: May 7, 2013
    Publication date: September 19, 2013
    Applicant: Chevron Philips Chemical Company LP
    Inventors: Albert P. Masino, Rex E. Murray, Qing Yang, Steve J. Secora, Kumudini C. Jayaratne, William B. Beaulieu, Errun Ding, Gary L. Glass, Alan L. Solenberger, Ted H. Cymbaluk
  • Nano-linked metallocene catalyst compositions and their polymer products
    Patent number: 8524626
    Abstract: The present invention provides polymerization catalyst compositions employing novel dinuclear metallocene compounds. Methods for making these new dinuclear metallocene compounds and for using such compounds in catalyst compositions for the polymerization and copolymerization of olefins are also provided.
    Type: Grant
    Filed: November 3, 2011
    Date of Patent: September 3, 2013
    Assignee: Chevron Phillips Chemical Company LP
    Inventors: Rex E. Murray, Kumudini C. Jayaratne, Qing Yang, Joel L. Martin
  • Dual metallocene catalyst systems for decreasing melt index and increasing polymer production rates
    Patent number: 8450436
    Abstract: The present invention provides dual catalyst systems and polymerization processes employing these dual catalyst systems. The disclosed polymerization processes can produce olefin polymers at higher production rates, and these olefin polymers may have a higher molecular weight and/or a lower melt index.
    Type: Grant
    Filed: November 20, 2012
    Date of Patent: May 28, 2013
    Assignee: Chevron Phillips Chemical Company LP
    Inventors: Albert P. Masino, Rex E. Murray, Qing Yang, Steve J. Secora, Kumudini C. Jayaratne, William B. Beaulieu, Errun Ding, Gary L. Glass, Alan L. Solenberger, Ted H. Cymbaluk
  • Nano-linked heteronuclear metallocene catalyst compositions and their polymer products
    Patent number: 8426536
    Abstract: The present invention provides polymerization catalyst compositions employing novel heterodinuclear metallocene compounds. Methods for making these new dinuclear metallocene compounds and for using such compounds in catalyst compositions for the polymerization of olefins are also provided.
    Type: Grant
    Filed: February 16, 2012
    Date of Patent: April 23, 2013
    Assignee: Chevron Phillips Chemical Company LP
    Inventors: Rex E. Murray, Kumudini C. Jayaratne, Qing Yang, Joel L. Martin, Gary L. Glass
  • Dual metallocene catalyst systems for decreasing melt index and increasing polymer production rates
    Patent number: 8329834
    Abstract: The present invention provides dual catalyst systems and polymerization processes employing these dual catalyst systems. The disclosed polymerization processes can produce olefin polymers at higher production rates, and these olefin polymers may have a higher molecular weight and/or a lower melt index.
    Type: Grant
    Filed: June 28, 2010
    Date of Patent: December 11, 2012
    Assignee: Chevron Phillips Chemical Company LP
    Inventors: Albert P. Masino, Rex E. Murray, Qing Yang, Steve J. Secora, Kumudini C. Jayaratne, William B. Beaulieu, Errun Ding, Gary L. Glass, Alan L. Solenberger, Ted H. Cymbaluk
  • Nano-linked metallocene catalyst compositions and their polymer products
    Patent number: 8329833
    Abstract: The present invention provides polymerization catalyst compositions employing novel dinuclear metallocene compounds. Methods for making these new dinuclear metallocene compounds and for using such compounds in catalyst compositions for the polymerization and copolymerization of olefins are also provided.
    Type: Grant
    Filed: February 20, 2012
    Date of Patent: December 11, 2012
    Assignee: Chevron Phillips Chemical Company LP
    Inventors: Rex E. Murray, Kumudini C. Jayaratne, Qing Yang, Joel L. Martin
  • Polymerization process for producing bimodal polymers
    Patent number: 8318873
    Abstract: Catalyst compositions comprising a first metallocene compound, a second metallocene compound, an activator-support, and an organoaluminum compound are provided. An improved method for preparing cyclopentadienyl complexes used to produce polyolefins is also provided.
    Type: Grant
    Filed: February 3, 2011
    Date of Patent: November 27, 2012
    Assignee: Chevron Phillips Chemical Company LP
    Inventors: Kumudini C. Jayaratne, Michael D. Jensen, Qing Yang
  • 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
  • DUAL METALLOCENE CATALYSTS FOR POLYMERIZATION OF BIMODAL POLYMERS
    Publication number: 20120190804
    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: Application
    Filed: February 15, 2012
    Publication date: July 26, 2012
    Applicant: CHEVRON PHILLIPS CHEMICAL COMPANY LP
    Inventors: QING YANG, KUMUDINI C. JAYARATNE, MICHAEL D. JENSEN, MAX P. MCDANIEL, JOEL L. MARTIN, MATTHEW G. THORN, JERRY T. LANIER, TONY R. CRAIN
  • Nano-Linked Metallocene Catalyst Compositions and Their Polymer Products
    Publication number: 20120149855
    Abstract: The present invention provides polymerization catalyst compositions employing novel dinuclear metallocene compounds. Methods for making these new dinuclear metallocene compounds and for using such compounds in catalyst compositions for the polymerization and copolymerization of olefins are also provided.
    Type: Application
    Filed: February 20, 2012
    Publication date: June 14, 2012
    Applicant: CHEVRON PHILLIPS CHEMICAL COMPANY LP
    Inventors: Rex E. Murray, Kumudini C. Jayaratne, Qing Yang, Joel L. Martin
  • NANO-LINKED HETERONUCLEAR METALLOCENE CATALYST COMPOSITIONS AND THEIR POLYMER PRODUCTS
    Publication number: 20120149854
    Abstract: The present invention provides polymerization catalyst compositions employing novel heterodinuclear metallocene compounds. Methods for making these new dinuclear metallocene compounds and for using such compounds in catalyst compositions for the polymerization of olefins are also provided.
    Type: Application
    Filed: February 16, 2012
    Publication date: June 14, 2012
    Applicant: CHEVRON PHILLIPS CHEMICAL COMPANY LP
    Inventors: REX E. MURRAY, KUMUDINI C. JAYARATNE, QING YANG, JOEL L. MARTIN, GARY L. GLASS
  • Nano-linked heteronuclear metallocene catalyst compositions and their polymer products
    Patent number: 8143430
    Abstract: The present invention provides polymerization catalyst compositions employing novel heterodinuclear metallocene compounds. Methods for making these new dinuclear metallocene compounds and for using such compounds in catalyst compositions for the polymerization of olefins are also provided.
    Type: Grant
    Filed: February 24, 2011
    Date of Patent: March 27, 2012
    Assignee: Chevron Phillips Chemical Company LP
    Inventors: Rex E. Murray, Kumudini C. Jayaratne, Qing Yang, Joel L. Martin, Gary L. Glass
  • Nano-linked metallocene catalyst compositions and their polymer products
    Patent number: 8143183
    Abstract: The present invention provides polymerization catalyst compositions employing novel dinuclear metallocene compounds. Methods for making these new dinuclear metallocene compounds and for using such compounds in catalyst compositions for the polymerization and copolymerization of olefins are also provided.
    Type: Grant
    Filed: November 10, 2010
    Date of Patent: March 27, 2012
    Assignee: Chevron Phillips Chemical Company LP
    Inventors: Rex E. Murray, Kumudini C. Jayaratne, Qing Yang, Joel L. Martin
  • Dual metallocene catalysts for polymerization of bimodal polymers
    Patent number: 8138113
    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: April 26, 2011
    Date of Patent: March 20, 2012
    Assignee: Chevron Phillips Chemical Company LP
    Inventors: Qing Yang, Kumudini C. Jayaratne, Michael D. Jensen, Max P. McDaniel, Joel L. Martin, Matthew G. Thorn, Jerry T. Lanier, Tony R. Crain
  • Nano-Linked Metallocene Catalyst Compositions and Their Polymer Products
    Publication number: 20120058886
    Abstract: The present invention provides polymerization catalyst compositions employing novel dinuclear metallocene compounds. Methods for making these new dinuclear metallocene compounds and for using such compounds in catalyst compositions for the polymerization and copolymerization of olefins are also provided.
    Type: Application
    Filed: November 3, 2011
    Publication date: March 8, 2012
    Applicant: Chevron Phillips Chemical Company LP
    Inventors: Rex E. Murray, Kumudini C. Jayaratne, Qing Yang, Joel L. Martin
  • Nano-linked metallocene catalyst compositions and their polymer products
    Patent number: 8080681
    Abstract: The present invention provides polymerization catalyst compositions employing novel dinuclear metallocene compounds. Methods for making these new dinuclear metallocene compounds and for using such compounds in catalyst compositions for the polymerization and copolymerization of olefins are also provided.
    Type: Grant
    Filed: December 28, 2007
    Date of Patent: December 20, 2011
    Assignee: Chevron Phillips Chemical Company LP
    Inventors: Rex E. Murray, Kumudini C. Jayaratne, Qing Yang, Joel L. Martin
  • Nano-Linked Metallocene Catalyst Compositions and Their Polymer Products
    Publication number: 20110288321
    Abstract: The present invention provides polymerization catalyst compositions employing novel dinuclear metallocene compounds. Methods for making these new dinuclear metallocene compounds and for using such compounds in catalyst compositions for the polymerization and copolymerization of olefins are also provided.
    Type: Application
    Filed: August 1, 2011
    Publication date: November 24, 2011
    Applicant: Chevron Phillips Chemical Company LP
    Inventors: Rex E. Murray, Kumudini C. Jayaratne, Qing Yang, Joel L. Martin