Patents by Inventor Jeff F. Greco

Jeff F. Greco 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 catalyst systems for producing polymers with a broad molecular weight distribution and a uniform short chain branch distribution
    Patent number: 10017592
    Abstract: Disclosed herein are ethylene-based polymers having a melt index less than 50 g/10 min, a ratio of Mw/Mn from 4 to 20, a density from 0.90 to 0.945 g/cm3, and a substantially constant short chain branch distribution. These polymers can be produced using a dual catalyst system containing a boron bridged metallocene compound with a cyclopentadienyl group and an indenyl group, and a single atom bridged metallocene compound with a fluorenyl group.
    Type: Grant
    Filed: January 4, 2017
    Date of Patent: July 10, 2018
    Assignee: Chevron Phillips Chemical Company LP
    Inventors: Qing Yang, Jeff F. Greco, Max P. McDaniel, Youlu Yu, Gary L. Glass, Tony R. Crain
  • Methods for controlling die swell in dual catalyst olefin polymerization systems
    Patent number: 9650459
    Abstract: Methods for controlling the die swell of an olefin polymer produced using a dual catalyst system are disclosed. The die swell of the olefin polymer can be increased or decreased as a function of the catalyst weight ratio and the reactant molar ratio used during the olefin polymerization process.
    Type: Grant
    Filed: September 9, 2015
    Date of Patent: May 16, 2017
    Assignee: Chevron Phillips Chemical Company LP
    Inventors: Jeff F Greco, Qing Yang, Vivek Rohatgi, Mark L. Hlavinka, Jim B Askew
  • Dual Catalyst Systems for Producing Polymers with a Broad Molecular Weight Distribution and a Uniform Short Chain Branch Distribution
    Publication number: 20170114169
    Abstract: Disclosed herein are ethylene-based polymers having a melt index less than 50 g/10 min, a ratio of Mw/Mn from 4 to 20, a density from 0.90 to 0.945 g/cm3, and a substantially constant short chain branch distribution. These polymers can be produced using a dual catalyst system containing a boron bridged metallocene compound with a cyclopentadienyl group and an indenyl group, and a single atom bridged metallocene compound with a fluorenyl group.
    Type: Application
    Filed: January 4, 2017
    Publication date: April 27, 2017
    Inventors: Qing Yang, Jeff F. Greco, Max P. McDaniel, Youlu Yu, Gary L. Glass, Tony R. Crain
  • Methods for Controlling Die Swell in Dual Catalyst Olefin Polymerization Systems
    Publication number: 20170066857
    Abstract: Methods for controlling the die swell of an olefin polymer produced using a dual catalyst system are disclosed. The die swell of the olefin polymer can be increased or decreased as a function of the catalyst weight ratio and the reactant molar ratio used during the olefin polymerization process.
    Type: Application
    Filed: September 9, 2015
    Publication date: March 9, 2017
    Inventors: Jeff F. Greco, Qing Yang, Vivek Rohatgi, Mark L. Hlavinka, Jim B. Askew
  • Dual catalyst systems for producing polymers with a broad molecular weight distribution and a uniform short chain branch distribution
    Patent number: 9574031
    Abstract: Disclosed herein are ethylene-based polymers having a melt index less than 50 g/10 min, a ratio of Mw/Mn from 4 to 20, a density from 0.90 to 0.945 g/cm3, and a substantially constant short chain branch distribution. These polymers can be produced using a dual catalyst system containing a boron bridged metallocene compound with a cyclopentadienyl group and an indenyl group, and a single atom bridged metallocene compound with a fluorenyl group.
    Type: Grant
    Filed: November 19, 2015
    Date of Patent: February 21, 2017
    Assignee: Chevron Phillips Chemical Company LP
    Inventors: Qing Yang, Jeff F. Greco, Max P. McDaniel, Youlu Yu, Gary L. Glass, Tony R. Crain
  • Polymers with improved ESCR for blow molding applications
    Patent number: 9493589
    Abstract: Disclosed herein are ethylene-based polymers generally characterized by a density greater than 0.954 g/cm3, high load melt index ranging from 10 to 45 g/10 min, a ratio of high load melt index to melt index ranging from 175 to 600, a rheological slope parameter ranging from 0.15 to 0.30, and an ESCR in 10% igepal exceeding 800 hours. These polymers have the beneficial processability and die swell features of chromium-based resins, but with improved stiffness and stress crack resistance, and can be used in blow molding and other end-use applications.
    Type: Grant
    Filed: September 9, 2015
    Date of Patent: November 15, 2016
    Assignee: Chevron Phillips Chemical Company LP
    Inventors: Jeff F Greco, Qing Yang, Vivek Rohatgi, Mark L. Hlavinka, Jim B Askew
  • Dual Catalyst Systems for Producing Polymers with a Broad Molecular Weight Distribution and a Uniform Short Chain Branch Distribution
    Publication number: 20160068625
    Abstract: Disclosed herein are ethylene-based polymers having a melt index less than 50 g/10 min, a ratio of Mw/Mn from 4 to 20, a density from 0.90 to 0.945 g/cm3, and a substantially constant short chain branch distribution. These polymers can be produced using a dual catalyst system containing a boron bridged metallocene compound with a cyclopentadienyl group and an indenyl group, and a single atom bridged metallocene compound with a fluorenyl group.
    Type: Application
    Filed: November 19, 2015
    Publication date: March 10, 2016
    Inventors: Qing Yang, Jeff F. Greco, Max P. McDaniel, Youlu Yu, Gary L. Glass, Tony R. Crain
  • Dual catalyst systems for producing polymers with a broad molecular weight distribution and a uniform short chain branch distribution
    Patent number: 9217049
    Abstract: Disclosed herein are ethylene-based polymers having a melt index less than 50 g/10 min, a ratio of Mw/Mn from 4 to 20, a density from 0.90 to 0.945 g/cm3, and a substantially constant short chain branch distribution. These polymers can be produced using a dual catalyst system containing a boron bridged metallocene compound with a cyclopentadienyl group and an indenyl group, and a single atom bridged metallocene compound with a fluorenyl group.
    Type: Grant
    Filed: May 22, 2014
    Date of Patent: December 22, 2015
    Assignee: Chevron Phillips Chemical Company LP
    Inventors: Qing Yang, Jeff F. Greco, Max P. McDaniel, Youlu Yu, Gary L. Glass, Tony R. Crain
  • Dual Catalyst Systems for Producing Polymers With a Broad Molecular Weight Distribution and a Uniform Short Chain Branch Distribution
    Publication number: 20150141593
    Abstract: Disclosed herein are ethylene-based polymers having a melt index less than 50 g/10 min, a ratio of Mw/Mn from 4 to 20, a density from 0.90 to 0.945 g/cm3, and a substantially constant short chain branch distribution. These polymers can be produced using a dual catalyst system containing a boron bridged metallocene compound with a cyclopentadienyl group and an indenyl group, and a single atom bridged metallocene compound with a fluorenyl group.
    Type: Application
    Filed: May 22, 2014
    Publication date: May 21, 2015
    Applicant: Chevron Phillips Chemical Company LP
    Inventors: Qing Yang, Jeff F. Greco, Max P. McDaniel, Youlu Yu, Gary L. Glass, Tony R. Crain