Patents by Inventor Karen K. Borodychuk

Karen K. Borodychuk 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).

  • Syndiotactic vinylidene aromatic polymerization process
    Patent number: 6362293
    Abstract: A process for preparing syndiotactic vinylidene aromatic polymers comprising contacting one or more vinylidene aromatic monomers with a concentrated catalyst premix composition comprising a Group 4 metal complex and an activating cocatalyst.
    Type: Grant
    Filed: September 12, 2000
    Date of Patent: March 26, 2002
    Assignee: The Dow Chemical Company
    Inventors: Thomas H. Newman, Karen K. Borodychuk
  • Syndiotactic monovinylidene aromatic polymerization process
    Patent number: 6355745
    Abstract: A process for preparing syndiotactic monovinylidene aromatic polymers comprising contacting one or more monovinylidene aromatic monomers with a catalyst composition comprising a Group 4 metal complex and an activating cocatalyst composition comprising an aluminoxane and an electrophilic borane compound.
    Type: Grant
    Filed: December 4, 2000
    Date of Patent: March 12, 2002
    Assignee: The Dow Chemical Company
    Inventors: Thomas H. Newman, Karen K. Borodychuk
  • Syndiotactic vinylidene aromatic polymerization process
    Patent number: 6075104
    Abstract: A process for polymerizing vinylidene aromatic monomers, such as styrene, to produce polymers having a high degree of syndiotacticity using a catalyst composition comprising a Group 4 metal complex and a hydrocarbylsilane or di(hydrocarbyl)silane catalyst adjuvant is disclosed.
    Type: Grant
    Filed: August 26, 1998
    Date of Patent: June 13, 2000
    Assignee: The Dow Chemical Company
    Inventors: Thomas H. Newman, Karen K. Borodychuk
  • Syndiotactic vinylidene aromatic polymerization process
    Patent number: 6013744
    Abstract: A process for preparing syndiotactic vinylidene aromatic polymers comprising contacting one or more vinylidene aromatic monomers with a hydrocarbylsilane or di(hydrocarbyl)silane adjuvant to form a monomer/silane mixture and contacting the monomer/silane mixture with a catalyst composition comprising a Group 4 metal complex and an activating cocatalyst.
    Type: Grant
    Filed: May 28, 1998
    Date of Patent: January 11, 2000
    Assignee: The Dow Chemical Company
    Inventors: Thomas H. Newman, Karen K. Borodychuk, Jurgen Schellenberg
  • Syndiotactic prochiral olefin polymerization process
    Patent number: 5536797
    Abstract: Octahydrofluorenyltitanium metal complexes or ring substituted octahydrofluorenyltitanium metal complexes wherein the metal is in the +2, +3 or +4 formal oxidation state and activating cocatalysts or activating techniques are used to produce catalysts useful for polymerizing prochiral olefins to form highly syndiotactic polymers.
    Type: Grant
    Filed: October 3, 1994
    Date of Patent: July 16, 1996
    Assignee: The Dow Chemical Company
    Inventors: Peter N. Nickias, Karen K. Borodychuk, Thomas H. Newman
  • Process for preparation of syndiocatic vinylidene aromatic polymers using reduced metal catalysts
    Patent number: 5512643
    Abstract: A process for preparing syndiotactic vinylidene aromatic polymers comprising contacting one or more vinylidene aromatic monomers with a catalyst comprising a Group 4 metal complex in the +3 oxidation state and a polyalkylaluminoxane cocatalyst.
    Type: Grant
    Filed: August 11, 1995
    Date of Patent: April 30, 1996
    Assignee: The Dow Chemical Company
    Inventors: Thomas H. Newman, Karen K. Borodychuk
  • Syndiotactic vinylaromatic polymerization process using low hydrogen partial pressures
    Patent number: 5468818
    Abstract: A process for preparing syndiotactic polymers of vinylaromatic monomers comprising contacting one or more vinylaromatic monomers with a catalyst system comprising a pentamethylcyclopentadienyltitanium based metal complex capable of preparing syndiotactic vinylaromatic polymers under coordination polymerization conditions in the presence of hydrogen gas at a hydrogen partial pressure from 10 to 45 kPa and maintaining said partial pressure of hydrogen continuously throughout the polymerization.
    Type: Grant
    Filed: March 13, 1995
    Date of Patent: November 21, 1995
    Assignee: The Dow Chemical Company
    Inventors: Thomas H. Newman, Karen K. Borodychuk
  • Process for preparation of syndiotactic vinylidene aromatic polymers using reduced metal cationic catalysts
    Patent number: 5453474
    Abstract: A process for preparing syndiotactic vinylidene aromatic polymers comprising contacting one or more vinylidene aromatic monomers with a catalyst comprising a cationic Group 4 metal complex wherein the metal is in the +3 oxidation state formed from the corresponding metal hydrocarbyloxy containing complex in the presence of a hydrocarbylation agent.
    Type: Grant
    Filed: October 8, 1993
    Date of Patent: September 26, 1995
    Assignee: The Dow Chemical Company
    Inventors: Thomas H. Newman, Karen K. Borodychuk
  • Process for preparation of syndiotactic vinylidene aromatic polymers using chain transfer agent
    Patent number: 5428120
    Abstract: A process for preparing syndiotactic vinylidene aromatic polymers comprising contacting one or more vinylidene aromatic monomers with tri n-propyl aluminum chain transfer agent under Ziegler-Natta polymerization conditions.
    Type: Grant
    Filed: October 8, 1993
    Date of Patent: June 27, 1995
    Assignee: The Dow Chemical Company
    Inventors: Thomas H. Newman, Karen K. Borodychuk