Patents by Inventor Francis J. Timmers

Francis J. Timmers 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).

  • Addition polymerization catalysts comprising reduced oxidation state metal complexes
    Patent number: 5532394
    Abstract: Metal complexes useful in the formation of addition polymerization catalysts of the formula: ##STR1## wherein Cp"' is a cyclopentadienyl group or substituted derivative thereof;Z is a divalent moiety comprising oxygen, nitrogen, phosphorous, boron or a member of Group 4 of the Periodic Table of Elements;Y is a linking group comprising nitrogen, phosphorus, oxygen or sulfur;M is a Group 4 metal in the +3 oxidation state; andL"' is a monovalent anionic stabilizing ligand.
    Type: Grant
    Filed: September 2, 1994
    Date of Patent: July 2, 1996
    Assignee: The Dow Chemical Company
    Inventors: Robert K. Rosen, Peter N. Nickias, David D. Devore, James C. Stevens, Francis J. Timmers
  • Zwitterionic biscyclopentadienyl complexes
    Patent number: 5527929
    Abstract: Zwitterionic biscyclopentadienyl, Group 4 transition metal complexes formed with conjugated dienes useful as catalysts for polymerizing olefins, diolefins and/or acetylenically unsaturated monomers.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: June 18, 1996
    Assignee: The Dow Chemical Company
    Inventors: Francis J. Timmers, David D. Devore
  • Homogenous, stabilized, reduced metal addition polymerization catalysts, process for preparation and method of use
    Patent number: 5494874
    Abstract: Complexes useful as addition polymerization catalysts, a process for their manufacture and addition polymerization processes wherein the complex comprises a Group 4 metal in the .sup.+ 3 oxidation state, a delocalized n-bonding moiety, and at least one stabilizing ligand.
    Type: Grant
    Filed: August 23, 1994
    Date of Patent: February 27, 1996
    Assignee: The Dow Chemical Company
    Inventors: Robert K. Rosen, David D. Devore, Peter N. Nickias, James C. Stevens, Francis J. Timmers
  • Group 4 metal diene complexes and addition polymerization catalysts therefrom
    Patent number: 5486632
    Abstract: Novel Group 4 metal complexes containing one and only one cyclic delocalized, anionic, .pi.-bonded group wherein the metal is in the +4 formal oxidation state and having a bridged ligand structure, also referred to as constrained geometry complexes and a conjugated diene divalent anionic ligand group; catalytic derivatives of such complexes including novel zwiterionic complexes; and the use thereof as catalysts for polymerizing olefins, diolefins and/or acetylenically unsaturated monomers.
    Type: Grant
    Filed: June 28, 1994
    Date of Patent: January 23, 1996
    Assignee: The Dow Chemical Company
    Inventors: David D. Devore, Francis J. Timmers, James C. Stevens, Robert K. Rosen
  • Titanium(II) or zirconium(II) complexes and addition polymerization catalysts therefrom
    Patent number: 5470993
    Abstract: Novel titanium or zirconium complexes containing one and only one cyclic delocalized, anionic, .pi.-bonded group wherein the metal is in the +2 formal oxidation state and having a bridged ligand structure, also referred to as constrained geometry complexes; catalytic derivatives of such complexes; methods of preparation; and the use thereof as catalysts for polymerizing olefins, diolefins and/or acetylenically unsaturated monomers.
    Type: Grant
    Filed: May 12, 1994
    Date of Patent: November 28, 1995
    Assignee: The Dow Chemical Company
    Inventors: David D. Devore, Francis J. Timmers, David R. Wilson, Robert K. Rosen
  • Compatibilized blend of olefinic polymers and monovinylidene aromatic polymers
    Patent number: 5460818
    Abstract: A polymer blend composition comprising:(a) from 0.5 to 99 percent by weight, based on the total weight of (a), (b), and (c), of an aliphatic .alpha.-olefin homopolymer or interpolymer, or an interpolymer of an .alpha.-olefin and a non-aromatic monomer interpolymerizable therewith;(b) from 0.5 to 99 percent by weight, based on the total weight of (a), (b), and (c), of a homopolymer or interpolymer of monovinylidene aromatic monomers, or an interpolymer of monovinylidene aromatic monomer and a monomer interpolymerizable therewith other than an aliphatic .alpha.-olefin; and(c) from 0.5 to 99 percent by weight, based on the total weight of (a), (b), and (c), of a substantially random interpolymer comprising an .alpha.-olefin and a vinylidene aromatic monomer.
    Type: Grant
    Filed: April 12, 1994
    Date of Patent: October 24, 1995
    Assignee: The Dow Chemical Company
    Inventors: Chung P. Park, George P. Clingerman, Francis J. Timmers, James C. Stevens, David E. Henton
  • Electrochemical preparation of addition polymerization catalysts
    Patent number: 5425872
    Abstract: Group 4 metal complexes useful as addition polymerization catalysts are prepared by electrolysis of cyclopentadienyl metal complexes under inert electrolysis conditions.
    Type: Grant
    Filed: July 15, 1994
    Date of Patent: June 20, 1995
    Assignee: The Dow Chemical Company
    Inventors: David D. Devore, Robert D. Mussell, James C. Stevens, Francis J. Timmers
  • Addition polymerization process using stabilized reduced metal catalysts
    Patent number: 5374696
    Abstract: Complexes useful as addition polymerization catalysts, a process for their manufacture and addition polymerization processes wherein the complex comprises a Group 4 metal in the .sup.+ 3 oxidation state, a delocalized .pi.-bonding moiety, and at least one stabilizing ligand.
    Type: Grant
    Filed: January 21, 1993
    Date of Patent: December 20, 1994
    Assignee: The Dow Chemical Company
    Inventors: Robert K. Rosen, Peter N. Nickias, David D. Devore, James C. Stevens, Francis J. Timmers
  • Electrochemical preparation of addition polymerization catalysts
    Patent number: 5372682
    Abstract: Group 4 metal complexes useful as addition polymerization catalysts are prepared by electrolysis of cyclopentadienyl metal complexes under inert electrolysis conditions.
    Type: Grant
    Filed: June 24, 1993
    Date of Patent: December 13, 1994
    Assignee: The Dow Chemical Company
    Inventors: David D. Devore, Robert D. Mussell, James C. Stevens, Francis J. Timmers
  • Preparation of addition polymerization catalysts via Lewis acid mitigated metal center oxidation
    Patent number: 5347024
    Abstract: Addition polymerization catalysts comprising a derivative of a titanium or zirconium in the +4 oxidation state prepared by metal center oxidation and cation complex formation of a reduced metal precursor complex via electron transfer in a single step by use of a neutral organic oxidant, optionally in the presence of a Lewis acid mitigator.
    Type: Grant
    Filed: March 19, 1993
    Date of Patent: September 13, 1994
    Assignee: The Dow Chemical Company
    Inventors: Peter N. Nickias, David D. Devore, Francis J. Timmers, Robert K. Rosen, Robert D. Mussell