Patents Represented by Attorney M. S. Spiering
  • Patent number: 5554704
    Abstract: The invention relates to a novel process for producing a supported metallocene catalyst system useful for the polymerization and/or copolymerization of olefins, alpha-olefins, and/or diolefins which results in a catalyst product which during polymerization, produces minimal to no reactor fouling and polymer of controlled morphology. The invention is particularly useful for but not limited to polymerizing propylene or copolymerizing propylene with olefins having two or more carbon atoms. The novel support technique described herein results in a catalyst which will obtain polymer product having controlled, uniform particle size, narrow molecular weight distribution, high bulk density and depending upon the metallocene employed and monomers polymerized, stereoregularity.
    Type: Grant
    Filed: July 1, 1994
    Date of Patent: September 10, 1996
    Assignee: Exxon Chemical Patents, Inc.
    Inventors: Terry J. Burkhardt, Masahide Murata, William B. Brandley
  • Patent number: 5541350
    Abstract: Disclosed is a mono- or di-amido silyldiyl bridged composition of matter useful as a catalyst component for the homo or copolymerization of olefins.
    Type: Grant
    Filed: August 16, 1995
    Date of Patent: July 30, 1996
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Masahide Murata, Terry J. Burkhardt
  • Patent number: 5504049
    Abstract: This invention relates to non-Group 4 transition metal compositions useful as olefin polymerization catalysts, wherein the transition metal is in a high oxidation state. The invention further relates to design of new ligand systems and methods of preparing and using the same. Compositions useful as catalyst precursors are neutral transition metal complexes comprising the unique ligand systems of the invention. The inventive compositions may be activated to a catalytic state by ion-exchange reagents or by Lewis acids.
    Type: Grant
    Filed: July 1, 1993
    Date of Patent: April 2, 1996
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Donna J. Crowther, Richard A. Fisher, Jo Ann M. Canich, Gregory G. Hlatky, Howard W. Turner
  • Patent number: 5502112
    Abstract: This invention relates to a ternary blend of 25 to 45 wt. % random polypropylene copolymer, 20 to 40 wt. % ethylene propylene rubber and 30 to 45 wt. % high density polyethylene having excellent low temperature impact resistance and useful for producing molded articles.
    Type: Grant
    Filed: December 1, 1994
    Date of Patent: March 26, 1996
    Assignee: Exxon Chemical Patents Inc.
    Inventor: Andrew J. Peacock
  • Patent number: 5502124
    Abstract: This invention relates to processes using non-Group 4 transition metal compositions useful as olefin polymerization catalysts, wherein the transition metal is in a high oxidation state. The invention further relates to design of new ligand systems and methods of preparing and using the same. Compositions useful as catalyst precursors are neutral transition metal complexes comprising the unique ligand systems of the invention. The inventive compositions may be activated to a catalytic state by ion-exchange reagents or by Lewis acids.
    Type: Grant
    Filed: May 19, 1995
    Date of Patent: March 26, 1996
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Donna J. Crowther, Richard A. Fisher, Jo Ann M. Canich, Gregory G. Hlatky, Howard W. Turner
  • Patent number: 5486326
    Abstract: A polyketone is contacted with an organic peroxyacid in a reactive, oxidization, slurry process to produce a polyester polymer.
    Type: Grant
    Filed: May 17, 1995
    Date of Patent: January 23, 1996
    Assignee: Exxon Chemical Patents Inc.
    Inventor: Palanisamy Arjunan
  • Patent number: 5408017
    Abstract: This invention relates to a process for polymerizing olefins at high pressures in a polymerization medium at high temperature utilizing an ionic olefin polymerization catalyst derived from the reaction of a cyclopentadienyl-containing transition metal compound having a hydrolyzable alkyl or hydride ligand with an ion exchange activator. The ionic catalyst system has been found to be highly active at temperatures of 160.degree. C. or greater, to provide a process capable of producing polymer products of desired chemical and physical properties at high production rates.
    Type: Grant
    Filed: June 14, 1993
    Date of Patent: April 18, 1995
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Howard W. Turner, Jo Ann M. Canich, Bernard J. Folie
  • Patent number: 5391629
    Abstract: A process for the production of block copolymers of ethylene and an .alpha.-olefin such as propylene by using an ionic catalyst system including a metallocene component and a component having a cation capable of donating a proton and a compatible non-coordinating anion. Novel block copolymers are produced.
    Type: Grant
    Filed: March 22, 1993
    Date of Patent: February 21, 1995
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Howard W. Turner, Gregory G. Hlatky, Henry W.-H. Yang, Avinash C. Gadkari, Gary F. Licciardi
  • Patent number: 5314973
    Abstract: Silicon-bridged transition metal compounds and their use as .alpha.-olefin polymerization catalysts are disclosed. A chiral silicon-bridged metallocene catalyst polymerizes .alpha.-olefins to high isotacity with a minimum of inversions at high rates of catalyst activity. The catalyst is easily made in high yields and readily separated from atactic meso forms.
    Type: Grant
    Filed: May 18, 1992
    Date of Patent: May 24, 1994
    Assignee: Exxon Chemical Patents Inc.
    Inventor: Howard C. Welborn, Jr.
  • Patent number: 5153157
    Abstract: This invention relates to catalyst systems, and a method for using such system, for the enhanced production of homo and copolymer products of olefin, diolefin and/or acetylenically unsaturated monomers. This invention catalyst system comprises a Group III-A element compound for improving the productivity of an olefin polymerization catalyst which is the reaction product of a metallocene of a Group IV-B transition metal and an ionic activator compound comprising a cation capable of donating a proton or which will irreversibly react with at least one ligand contained in the Group IV-B metal compound and an anion which is bulky, labile and noncoordinateable with the Group IV transition metal cation produced upon reaction of the metallocene and activator compound to form the catalyst component of the catalyst system.
    Type: Grant
    Filed: March 20, 1990
    Date of Patent: October 6, 1992
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Gregory G. Hlatky, Howard W. Turner