Patents Represented by Attorney Jaimes Sher

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  • Polymerization catalyst systems, their production and use
    Patent number: 5639835
    Abstract: This invention is generally directed toward a supported catalyst system useful for polymerizing olefins. The invention particularly relates to a supported metallocene catalyst system that does not require an activator or cocatalyst for the polymerization of olefins.
    Type: Grant
    Filed: September 11, 1995
    Date of Patent: June 17, 1997
    Inventor: Moses Olukayode Jejelowo
  • Catalyst compounds for olefin polymerization
    Patent number: 5633394
    Abstract: Compounds useful as catalyst components for olefin polymerization. The compounds comprise derivatives of cyclopentadienyl complexes of the ZR or HF.
    Type: Grant
    Filed: May 3, 1994
    Date of Patent: May 27, 1997
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Howard C. Welborn, Jr., John A. Ewen
  • Polymerization catalyst systems, their production and use
    Patent number: 5629253
    Abstract: This invention is generally directed toward a supported catalyst system useful for polymerizing olefins. The method for supporting the catalyst of the invention provides for a supported bulky ligand transition metal catalyst which when utilized in a polymerization process substantially reduces the reactor fouling and sheeting particularly in a slurry phase polymerization process.
    Type: Grant
    Filed: January 16, 1996
    Date of Patent: May 13, 1997
    Assignee: Exxon Chemical Patents, Inc.
    Inventor: Main Chang
  • Supported polymerization catalyst systems, their production and use
    Patent number: 5616665
    Abstract: This invention is generally directed toward a supported catalyst system useful for polymerizing olefins. The method for supporting the catalyst of the invention provides for a supported metallocene catalyst able to produce polymers having broader molecular weight distribution and a higher molecular weight. Not only are such polymers easily processable as compared with metallocene polymers produced with other support methods but the methods of this invention provides for a supported catalyst with increased activity.
    Type: Grant
    Filed: January 16, 1996
    Date of Patent: April 1, 1997
    Assignee: Exxon Chemical Patents, Inc.
    Inventors: Moses O. Jejelowo, Robert L. Bamberger
  • Process of polymerization using aged activators
    Patent number: 5602217
    Abstract: This invention is generally directed toward a catalyst system useful for polymerizing olefins. The method for preparing the catalyst of the invention provides for combining a bulky ligand transition metal catalyst with an activator that has been aged, optionally with a support. The catalyst system is useful in any polymerization process.
    Type: Grant
    Filed: August 16, 1995
    Date of Patent: February 11, 1997
    Assignee: Exxon Chemical Patents Inc.
    Inventor: Moses O. Jejelowo
  • Polymerization catalyst systems, their production and use
    Patent number: 5595950
    Abstract: This invention is generally directed toward a supported catalyst system useful for polymerizing olefins. The method for supporting the catalyst of the invention provides for a supported bulky ligand transition metal catalyst which when utilized in a polymerization process substantially reduces the reactor fouling and sheeting particularly in a gas phase polymerization process.
    Type: Grant
    Filed: November 8, 1995
    Date of Patent: January 21, 1997
    Assignee: Exxon Chemical Patents, Inc.
    Inventors: Vispi R. Sagar, Moses O. Jejelowo
  • Process and catalyst for polyolefin density and molecular weight control
    Patent number: 5580939
    Abstract: Catalysts comprising (a) derivatives of mono, bi and tricyclopentadienyl coordination complexes with a transition metal and (b) an alumoxane are employed in a process of producing polyolefins of controlled molecular weight.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: December 3, 1996
    Assignee: Exxon Chemical Patents Inc.
    Inventors: John A. Ewen, Howard C. Welborn, Jr.
  • Functionalized polymer and method to obtain functionalized polymer
    Patent number: 5580935
    Abstract: This invention relates to functionalized polymers and a method to obtain them comprising combing a living polymer or a polymer having a terminal halide with an alkylsilylpseudohalide.
    Type: Grant
    Filed: January 13, 1995
    Date of Patent: December 3, 1996
    Assignee: Exxon Chemical Patents Inc.
    Inventor: Timothy D. Shaffer
  • Polymerization catalyst systems, their production and use
    Patent number: 5552358
    Abstract: This invention is generally directed toward a supported catalyst system useful for polymerizing olefins. The method for preparing the catalyst system of the invention provides for an optionally supported, metallocene catalyst component which when utilized in a polymerization process exhibits improved reactor operability.
    Type: Grant
    Filed: June 27, 1995
    Date of Patent: September 3, 1996
    Assignee: Exxon Chemical Patents Inc.
    Inventor: Anthony N. Speca
  • Thermoplastic elastomers
    Patent number: 5539056
    Abstract: This invention relates to polypropylene blends, particularly blends of high molecular weight amorphous polypropylene with low molecular weight isotactic polypropylene. These blends exhibit unusual elastomeric properties.
    Type: Grant
    Filed: January 31, 1995
    Date of Patent: July 23, 1996
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Henry W. Yang, Jo Ann M. Canich, Gary F. Licciardi
  • Polymerization catalysts, their production and use
    Patent number: 5536796
    Abstract: The invention generally relates to a catalyst, particularly a metallocene catalyst and catalyst system useful in the polymerization of olefins into a polymer product. The polymer product has a broad molecular weight distribution, a high molecular weight and a narrow composition distribution and is easily processable.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: July 16, 1996
    Assignee: Exxon Chemical Company
    Inventors: Moses O. Jejelowo, Robert L. Bamberger
  • Heat sealable films and articles made therefrom
    Patent number: 5530065
    Abstract: Heat sealed articles and heat sealable films comprising a polymer blend of a first polymer having a narrow molecular weight and composition distribution and a second polymer having a broad molecular weight distribution and composition distribution. The articles and films have significantly improved physical characteristics and remarkably low heat seal initiation temperatures, high seal strength, high hot tack and therefore provide improved processibility and higher line speeds on commercial heat sealing equipment.
    Type: Grant
    Filed: May 25, 1995
    Date of Patent: June 25, 1996
    Assignee: Exxon Chemical Patents Inc.
    Inventors: James M. Farley, Prasadarao Meka, Ferdinand C. Stehling, Barry C. Trudell, Myron B. Kurtzman
  • Functionalized polymer and methods to obtain functionalized polymer
    Patent number: 5523359
    Abstract: This invention relates to functionalized polymers and a method to obtain them comprising combing a living polymer or a polymer having a terminal halide group with an silyl enol ether.
    Type: Grant
    Filed: January 13, 1995
    Date of Patent: June 4, 1996
    Assignee: Exxon Chemical Patents Inc.
    Inventor: Timothy D. Shaffer
  • Process to produce thermoplastic elastomers
    Patent number: 5516848
    Abstract: This invention relates to polypropylene blends, particularly blends of high molecular weight amorphous polypropylene with lower molecular weight isotactic polypropylene. These blends exhibit unusual elastomeric properties.
    Type: Grant
    Filed: January 31, 1995
    Date of Patent: May 14, 1996
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Jo Ann M. Canich, Henry W. Yang, Gary F. Licciardi
  • Polymerization catalyst systems, their production and use
    Patent number: 5516737
    Abstract: This invention is generally directed toward a catalyst system useful for polymerizing olefins. The catalyst system of this invention comprises a supported bulky ligand transition metal compound and a separately supported cocatalyst or activator for the compound.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: May 14, 1996
    Assignee: Exxon Chemical Patents Inc.
    Inventor: Moses O. Jejelowo
  • Polymerization catalyst systems, their production and use
    Patent number: 5516861
    Abstract: This invention is generally directed toward a catalyst system useful for polymerizing olefins. The catalyst system of this invention comprises a supported bulky ligand transition metal compound and a separately supported cocatalyst or activator for the compound.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: May 14, 1996
    Assignee: Exxon Chemical Patents Inc.
    Inventor: Moses O. Jejelowo
  • Polymerization catalysts, their production and use
    Patent number: 5470811
    Abstract: The invention generally relates to a catalyst, particularly a metallocene catalyst and catalyst system useful in the polymerization of olefins into a polymer product. The polymer product has a broad molecular weight distribution, a high molecular weight and a narrow composition distribution and is easily processable.
    Type: Grant
    Filed: February 13, 1995
    Date of Patent: November 28, 1995
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Moses O. Jejelowo, Robert L. Bamberger
  • Method for making a catalyst system
    Patent number: 5468702
    Abstract: This invention is generally directed toward a catalyst system useful for polymerizing olefins. The method for preparing the catalyst of the invention provides for combining a bulky ligand transition metal catalyst with an activator that has been aged, optionally with a support. The catalyst system is useful in any polymerization process.
    Type: Grant
    Filed: July 7, 1994
    Date of Patent: November 21, 1995
    Assignee: Exxon Chemical Patents Inc.
    Inventor: Moses O. Jejelowo
  • Polymerization catalyst systems, their production and use
    Patent number: 5466649
    Abstract: This invention is generally directed toward a catalyst system useful for polymerizing olefins. The catalyst system of this invention comprises a supported bulky ligand transition metal compound and a separately supported cocatalyst or activator for the compound.
    Type: Grant
    Filed: October 15, 1993
    Date of Patent: November 14, 1995
    Assignee: Exxon Chemical Patents Inc.
    Inventor: Moses O. Jejelowo
  • Process for polymerizing monomers in fluidized beds
    Patent number: 5462999
    Abstract: The invention is directed toward polymerizing or copolymerizing alpha-olefins either alone or in combination with one or more other alpha-olefins in the presence of a metallocene catalyst in a gas phase reactor having a fluidized bed and a fluidizing medium such that the fluidizing medium entering the reactor comprises a gas and a liquid phase.
    Type: Grant
    Filed: October 3, 1994
    Date of Patent: October 31, 1995
    Assignee: Exxon Chemical Patents Inc.
    Inventors: John R. Griffin, Marc L. DeChellis, Michael E. Muhle