Patents Represented by Attorney, Agent or Law Firm C. Paige Schmidt
  • Method for making supported catalyst systems and catalyst systems therefrom
    Patent number: 5721184
    Abstract: Catalyst systems and methods for supporting catalysts and their components, particularly metallocene catalyst components, are provided. The method involves techniques for evenly distributing a small volume of catalyst component over and among a porous support material. Such even distribution is thought to result in reduced fouling.
    Type: Grant
    Filed: August 27, 1996
    Date of Patent: February 24, 1998
    Assignees: Hoechst, Exxon Chemical Patents Inc.
    Inventors: Jeffrey Lawrence Brinen, Anthony Nicholas Speca, Kelly Tormaschy, Kathryn Ann Russell
  • Diene modified polymers
    Patent number: 5670595
    Abstract: Diene modified polymers are provided as well as methods for preparing the same. The polymers have from 3-8 carbon atoms, from about 0.00005 to about 5 mole percent diene based on the total weight of the polymer. The polymers are essentially gel-free and exhibit enhanced melt strength and shear thinning behavior.
    Type: Grant
    Filed: August 28, 1995
    Date of Patent: September 23, 1997
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Prasadaro Meka, Kunihiko Imanishi, Gary Frederick Licciardi, Avinash Chandrakant Gadkari
  • Method for preparing metallocene catalyst systems
    Patent number: 5635437
    Abstract: This invention is generally directed toward a method for producing metallocene catalyst systems. Specifically, the method involves removing solid impurities from a solution of activated metallocene wherein activation has the effect of solubilizing the metallocene but not the impurities. The resulting catalyst system is higher in activity and produces polymer having excellent particle morphology with little or no reactor fouling.
    Type: Grant
    Filed: July 28, 1995
    Date of Patent: June 3, 1997
    Assignees: Exxon Chemicals Patents, Inc., Hoechst Aktiengesellschaft
    Inventors: Terry J. Burkhardt, William B. Brandley
  • 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
  • Method for making supported catalyst systems and catalyst systems therefrom
    Patent number: 5625015
    Abstract: Catalyst systems and methods for supporting catalysts and their components, particularly metallocene catalyst components, are provided. The method involves techniques for evenly distributing a small volume of catalyst component over and among a porous support material. Such even distribution is thought to result in reduced fouling.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: April 29, 1997
    Assignees: Exxon Chemical Patents Inc., Hoechst
    Inventors: Jeffrey L. Brinen, Anthony N. Speca, Kelly Tormaschy, Kathryn A. Russell
  • 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
  • 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
  • Process for producing amorphous poly-.alpha.-olefins with a monocyclopentadienyl transition metal catalyst system
    Patent number: 5504169
    Abstract: The invention is a catalytic process using a Group IV B transition metal component and a cocatalyst or activator component to polymerize .alpha.-olefins to produce amorphous poly-.alpha.-olefins having high molecular weight.
    Type: Grant
    Filed: February 28, 1995
    Date of Patent: April 2, 1996
    Assignee: Exxon Chemical Patents Inc.
    Inventor: Jo Ann M. Canich
  • Amidosilyldiyl bridged catalysts and method of polymerization using said catalysts.
    Patent number: 5486585
    Abstract: Disclosed is a mono- or di-amido siladiyl bridged composition of matter useful as a catalyst component for the homo or copolymerization of olefins.
    Type: Grant
    Filed: August 26, 1993
    Date of Patent: January 23, 1996
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Masahide Murata, Terry J. Burkhardt
  • 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
  • Method and apparatus for feeding a catalyst
    Patent number: 5433924
    Abstract: A catalyst feed system is described for intermittent delivery of supported and/or prepolymerized supported catalyst to a polymerization reactor. The system incorporates valves with cylindrical sealing surfaces as well as a venting stage incorporating a filter arranged such that it is self-cleaning.
    Type: Grant
    Filed: March 31, 1994
    Date of Patent: July 18, 1995
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Vispi R. Sagar, Scott K. Jackson
  • Process for producing amorphous poly-.alpha.-olefins with a monocyclopentadienyl transition metal catalyst system
    Patent number: 5420217
    Abstract: The invention is a catalytic process using a Group IV B transition metal component and an alumoxane component to polymerize propylene to produce amorphous polypropylene.
    Type: Grant
    Filed: November 30, 1993
    Date of Patent: May 30, 1995
    Assignee: Exxon Chemical Patents Inc.
    Inventor: Jo Ann M. Canich