Patents by Inventor Alexei Alexeyevich Gridnev

Alexei Alexeyevich Gridnev 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).

  • Alpha-methylstyrene dimer derivatives
    Patent number: 6388153
    Abstract: The present invention relates to a method of making alpha-methylstyrene dimers by combining a cobalt catalyst, a free-radical initiator and an alpha-methylstyrene monomer, in an inert atmosphere, to form a mixture. The mixture is heated to a temperature in the range of 65° C. to 140° C. to form alpha methyl styrene dimers. The present invention also relates to the products produced by this inventive method.
    Type: Grant
    Filed: May 9, 2001
    Date of Patent: May 14, 2002
    Assignee: E. I. duPont Nemours and Company
    Inventor: Alexei Alexeyevich Gridnev
  • Oligomerization, polymerization and copolymerization of substituted and unsubstituted &agr;-methylene-&ggr;-butyrolactones and products thereof
    Patent number: 6388036
    Abstract: This invention relates to the oligomerization, polymerization and copolymerization of substituted and unsubstituted &agr;-methylene-&ggr;-butyrolactones and the products thereof, Cobalt (II) and cobalt (III) chain transfer catalysts are used to control the molecular weight and impart an aromatic functionality to the products formed.
    Type: Grant
    Filed: May 31, 2001
    Date of Patent: May 14, 2002
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Alexei Alexeyevich Gridnev, Steven Dale Ittei
  • Alpha-methylstyrene dimer derivatives
    Publication number: 20010025128
    Abstract: The present invention relates to a method of making alpha-methylstyrene dimers by combining a cobalt catalyst, a free-radical initiator and an alpha-methylstyrene monomer, in an inert atmosphere, to form a mixture. The mixture is heated to a temperature in the range of 65° C. to 140° C. to form alpha methyl styrene dimers. The present invention also relates to the products produced by this inventive method.
    Type: Application
    Filed: May 9, 2001
    Publication date: September 27, 2001
    Inventor: Alexei Alexeyevich Gridnev
  • Alpha-methylstyrene dimer derivatives
    Patent number: 6294708
    Abstract: The present invention relates to a method of making alpha-methylstyrene dimers by combining a cobalt catalyst, a free-radical initiator and an alpha-methylstyrene monomer, in an inert atmosphere, to form a mixture. The mixture is heated to a temperature in the range of 5° C. to 140° C. to form alpha methyl styrene dimers. The present invention also relates to the products produced by this inventive method.
    Type: Grant
    Filed: February 5, 1999
    Date of Patent: September 25, 2001
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Alexei Alexeyevich Gridnev
  • Free radical polymer chain initiation with unreactive unsaturates
    Patent number: 6117958
    Abstract: This invention relates to a method by which olefinically-unsaturated organic molecules, which are otherwise nonpolymerizable, may be homopolymerized or copolymerized with conventional monomers through the use of cobalt chain transfer catalysts. The resulting macromonomers contain one terminal functional group and a terminal double bond on the other end of the chain.
    Type: Grant
    Filed: November 17, 1998
    Date of Patent: September 12, 2000
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Steven Dale Ittel, Alexei Alexeyevich Gridnev
  • Free radical polymer chain initiation with unreactive unsaturates
    Patent number: 5883206
    Abstract: This invention relates to a method by which olefinically-unsaturated organic molecules, which are otherwise nonpolymerizable, may be homopolymerized or copolymerized with conventional monomers through the use of cobalt chain transfer catalysts. The resulting macromonomers contain one terminal functional group and a terminal double bond on the other end of the chain.
    Type: Grant
    Filed: March 17, 1997
    Date of Patent: March 16, 1999
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Steven Dale Ittel, Alexei Alexeyevich Gridnev
  • Functionalized diene oligomers
    Patent number: 5847060
    Abstract: This invention relates to the controlled molecular weight production of macromonomers and polymers with terminal conjugated double bonds from starting monomers including, but not limited to substituted butadienes. The terminal diene end thus produced is also a potential reaction site for further polymerization or functionalization. The molecular weight is controlled by use of Co chain transfer catalysts and appropriate process conditions.
    Type: Grant
    Filed: August 18, 1997
    Date of Patent: December 8, 1998
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Alexei Alexeyevich Gridnev, Steven Dale Ittel
  • Decolorization of hydroxy-containing methacrylate homopolymers and copolymers
    Patent number: 5750772
    Abstract: This invention relates to a process whereby hydroxy-containing methacrylate homo- and copolymers are decolorized by the addition of a strong acid and a chelating bidentate nitrogen ligand, with subsequent filtering through a polar adsorption medium.
    Type: Grant
    Filed: January 30, 1997
    Date of Patent: May 12, 1998
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Alexei Alexeyevich Gridnev
  • Molecular weight truncation and color control in macromonomers
    Patent number: 5726263
    Abstract: Macromonomers formed by chain transfer catalysis polymerization methods may be decolorized by selective extraction and/or adsorption. The dimers and trimers formed during the polymerization reaction are also removed from the macromonomer mixture so that the remaining mixture has a very low optical density and a desirable degree of polymerization.
    Type: Grant
    Filed: January 30, 1997
    Date of Patent: March 10, 1998
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Alexei Alexeyevich Gridnev