Transition Metal Is Group Viii Patents (Class 526/169.1)
  • Polymers of substituted cyclopentenes
    Patent number: 6258908
    Abstract: Substituted cyclopentenes, such as alkyl cyclopentenes, are polymerized by selected &agr;-imine complexes of nickel and palladium. The polymers are useful as molding resins or elastomers. Also disclosed herein are novel catalysts for the polymerization of cyclopentenes to form novel higher melting homopolycyclopentenes.
    Type: Grant
    Filed: March 26, 1999
    Date of Patent: July 10, 2001
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Stephan James McLain, Elizabeth Forrester McCord, Alison Margaret Anne Bennett, Steven Dale Ittel, Karl Jeffrey Sweetman, Mark F. Teasley
  • Molecular weight control in olefin polymerization
    Patent number: 6252022
    Abstract: The molecular weight of polyolefins produced using iron or cobalt complexes of 2,6-pyridinecarboxaldehyde diimines or a 2,6-diacylpyridine diimines as polymerization catalysts may be lowered by carrying out the polymerization in the presence of hydrogen.
    Type: Grant
    Filed: May 21, 1999
    Date of Patent: June 26, 2001
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Samuel David Arthur, Joel David Citron
  • Iron catalyst for the polymerization of olefins
    Patent number: 6214761
    Abstract: Catalysts based on iron complexes of 2,6-pyridinecarboxaldehydebis(imine) and 2,6-diacylpyridine-bis(imine) tridentate ligands are provided, which are particularly suitable for the polymerization of olefins.
    Type: Grant
    Filed: March 22, 1999
    Date of Patent: April 10, 2001
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Alison Margaret Anne Bennett
  • Iron-based catalyst composition and process for producing conjugated diene polymers
    Patent number: 6211313
    Abstract: A catalyst composition that is the combination of or the reaction product of ingredients including an iron-containing compound, a hydrogen phosphite, and an aluminoxane. This catalyst composition is useful for polymerizing conjugated diene monomers and is particularly useful for polymerizing 1,3-butadiene into syndiotactic 1,2-polybutadiene.
    Type: Grant
    Filed: November 12, 1999
    Date of Patent: April 3, 2001
    Assignee: Bridgestone Corporation
    Inventor: Steven Luo
  • Preparation of syndiotactic 1, 2-polybutadiene using a chromium-containing catalyst system
    Patent number: 6201080
    Abstract: The instant invention teaches a method for forming a syndiotactic 1,2-polybutadiene product having a syndiotacticity of more than 66.5% and a melting temperature of more than about 100° C. The method includes polymerizing 1,3-butadiene in solution with a solvent, in the presence of catalytically effective amounts of: (a) an organomagnesium compound; (b) a chromium compound; and, (c) a dihydrocarbyl hydrogen phosphite. The present invention also contemplates a product of the method and an article made from the product.
    Type: Grant
    Filed: December 23, 1997
    Date of Patent: March 13, 2001
    Assignee: Bridgestone Corporation
    Inventors: Steven X. L. Luo, Yoichi F. Ozawa, James E. Hall, Jung W. Kang