Patents by Inventor Alexei Gridnev

Alexei 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).

  • Initiation of polymerization by hydrogen atom donation
    Publication number: 20050209418
    Abstract: This invention relates to the polymerization of vinylically-unsaturated monomers in the presence of a chain transfer catalysts where the polymerization process is initiated with hydrogen gas or a hydrogen atom donor rather than conventional free radical initiators. This invention further relates to an improved process for the polymerization of vinylically-unsaturated monomers in the presence of a chain transfer catalysts where the polymerization process is initiated with hydrogen gas.
    Type: Application
    Filed: March 16, 2004
    Publication date: September 22, 2005
    Inventors: Alexei Gridnev, Steven Ittel
  • Ketal-protected polyols for low VOC coatings
    Publication number: 20050209432
    Abstract: The invention relates to a coating composition wherein ketal groups block the hydroxyl groups of the poly(meth)acrylate and the ketal groups can be removed through hydrolysis in order to facilitate cross-linking through reaction with polyisocyanate compounds. The invention also relates to a process for curing the aforementioned coating composition. The invention also relates to a process for coating substrates wherein a clear coat comprising the aforementioned coating composition is coated over a base coat. The invention also relates to a process for blocking the hydroxyl groups of a poly(meth)acrylate compound through reaction with a ketal compound.
    Type: Application
    Filed: March 22, 2005
    Publication date: September 22, 2005
    Inventors: Robert Barsotti, Laura Lewin, Alexei Gridnev
  • Branched polymers and coating compositions made therefrom
    Publication number: 20050054767
    Abstract: This invention relates to rapid curing coating compositions that are particularly useful for automotive OEM and refinish applications. The coating composition includes a crosslinkable component that contains a novel highly branched acrylic polymer, and a crosslinking component that contains conventional crosslinking agents, such as polyisocyanate and melamine. This invention is also directed to a process for producing coatings from the rapid curing coating compositions. These compositions are especially useful in providing hard highly crosslinked coatings.
    Type: Application
    Filed: July 7, 2004
    Publication date: March 10, 2005
    Inventors: Thomas Darling, Robert Barsotti, Alexei Gridnev, Patricia Sormani
  • Alkyl cobalt (III) dioximates and process for forming the same
    Patent number: 6858745
    Abstract: This invention is directed to alkyl cobalt (III) dioximates and methods for making these dioximates.
    Type: Grant
    Filed: February 21, 2003
    Date of Patent: February 22, 2005
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Alexei A. Gridnev, Gregorii A. Nikiforov
  • Catalytic polymerization process
    Publication number: 20050014911
    Abstract: This invention relates to a process for controlling the architecture of copolymers of at least two unsaturated monomers, made by free radical polymerization in the presence of a cobalt-containing chain transfer agent, including the control of molecular weight degree of branching and vinyl end group termination, by varying at least one of the variables of molar ratio of monomers, their relative chain transfer constants, polymerization temperature and degree of conversion and amount of cobalt chain transfer agent; and polymers made thereby.
    Type: Application
    Filed: August 13, 2004
    Publication date: January 20, 2005
    Inventors: Graeme Moad, Ezio Rizzardo, Catherine Moad, Steven Ittel, Lech Wilczek, Alexei Gridnev
  • Alkyl cobalt(III) dioximates and process for forming the same
    Patent number: 6740618
    Abstract: This invention is directed to alkyl cobalt (III) dioximates and methods for making these dioximates.
    Type: Grant
    Filed: February 21, 2003
    Date of Patent: May 25, 2004
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Alexei A. Gridnev, Gregorii A. Nikiforov
  • Alkyl cobalt (III) dioximates and process for forming the same
    Patent number: 6713427
    Abstract: This invention is directed to alkyl cobalt (II) dioximates and methods for making these dioximates.
    Type: Grant
    Filed: February 21, 2003
    Date of Patent: March 30, 2004
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Alexei A. Gridnev, Gregorii A. Nikiforov
  • Catalytic polymerization process
    Publication number: 20030212218
    Abstract: This invention relates to a process for controlling the architecture of copolymers of at least two unsaturated monomers, made by free-radical polymerization in the presence of a cobalt-containing chain transfer agent, including the control of molecular weight, degree of branching and vinyl end group termination, by varying at least one of the variables of molar ratio of monomers, their relative chain transfer constants, polymerization temperature and degree of conversion and amount of cobalt chain transfer agent; and polymers made thereby.
    Type: Application
    Filed: April 18, 2003
    Publication date: November 13, 2003
    Inventors: Graeme Moad, Ezio Rizzardo, Catherin Louise Moad, Steven Dale Ittel, Lech Wilczek, Alexei A. Gridnev
  • Catalytic polymerization process
    Publication number: 20030195313
    Abstract: This invention relates to a process for controlling the architecture of copolymers of at least two unsaturated monomers, made by free-radical polymerization in the presence of a cobalt-containing chain transfer agent, including the control of molecular weight, degree of branching and vinyl end group termination, by varying at least one of the variables of molar ratio of monomers, their relative chain transfer constants, polymerization temperature and degree of conversion and amount of cobalt chain transfer agent, and polymers made thereby.
    Type: Application
    Filed: January 24, 2003
    Publication date: October 16, 2003
    Inventors: Graeme Moad, Ezio Rizzardo, Catherine Louise Moad, Steven Dale Ittel, Lech Wilczek, Alexei A. Gridnev
  • Catalytic polymerization process
    Patent number: 6624261
    Abstract: This invention relates to a process for controlling the architecture of copolymers of at least two unsaturated monomers, made by free-radical polymerization in the presence of a cobalt-containing chain transfer agent, including the control of molecular weight, degree of branching and vinyl end group termination, by varying at least one of the variables of molar ratio of monomers, their relative chain transfer constants, polymerization temperature and degree of conversion and amount of cobalt chain transfer agent; and polymers made thereby.
    Type: Grant
    Filed: August 19, 1998
    Date of Patent: September 23, 2003
    Assignees: E. I. du Pont Nemours and Company, Commonwealth Scientific and Industrial Research Organization
    Inventors: Graeme Moad, Ezio Rizzardo, Catherine Louise Moad, Steven Dale Ittel, Lech Wilczek, Alexei A. Gridnev
  • Alkyl cobalt (III) dioximates and process for forming the same
    Publication number: 20030149275
    Abstract: This invention is directed to alkyl cobalt (II) dioximates and methods for making these dioximates.
    Type: Application
    Filed: February 21, 2003
    Publication date: August 7, 2003
    Inventors: Alexei A. Gridnev, Gregorii A. Nikiforov
  • Method of controlling polymer molecular weight and structure
    Publication number: 20030149208
    Abstract: This invention concerns the preparation of polymers of low polydispersity and/or controlled molecular weight and architecture employing living free radical polymerization initiated by an alkoxyamine initiator or nitroxide plus, optionally, a free radical initiator; the polymer produced thereby; selected nitroxide and alkoxyamine initiators; and a process for making the initiators; the polymeric products being useful in protective coatings.
    Type: Application
    Filed: January 3, 2003
    Publication date: August 7, 2003
    Inventors: Albert G. Anderson, Alexei Gridnev, Graeme Moad, Ezio Rizzardo, San Hoa Thang
  • Alkyl cobalt(III) dioximates and process for forming the same
    Publication number: 20030135054
    Abstract: This invention is directed to alkyl cobalt (III) dioximates and methods for making these dioximates.
    Type: Application
    Filed: February 21, 2003
    Publication date: July 17, 2003
    Inventors: Alexei A. Gridnev, Gregorii A. Nikiforov
  • Alkyl cobalt (III) dioximates and process for forming the same
    Publication number: 20030125564
    Abstract: This invention is directed to alkyl cobalt (III) dioximates and methods for making these dioximates.
    Type: Application
    Filed: February 21, 2003
    Publication date: July 3, 2003
    Inventors: Alexei A. Gridnev, Gregorii A. Nikiforov
  • Alkyl cobalt (III) dioximates and process for forming the same
    Patent number: 6559327
    Abstract: This invention is directed to alkyl cobalt (III) dioximates and methods for making these dioximates.
    Type: Grant
    Filed: April 30, 2001
    Date of Patent: May 6, 2003
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Alexei A. Gridnev, Gregorii A. Nikiforov
  • Alkyl cobalt (III) dioximates and process for forming the same
    Publication number: 20020087006
    Abstract: This invention is directed to alkyl cobalt (III) dioximates and methods for making these dioximates.
    Type: Application
    Filed: April 30, 2001
    Publication date: July 4, 2002
    Inventors: Alexei A. Gridnev, Gregorii A. Nikiforov
  • Method of controlling polymer molecular weight and structure
    Publication number: 20020061989
    Abstract: This invention concerns the preparation of polymers of low polydispersity and/or controlled molecular weight and architecture employing living free radical polymerization initiated by an alkoxyamine initiator or nitroxide plus, optionally, a free radical initiator; the polymer produced thereby; selected nitroxide and alkoxyamine initiators; and a process for making the initiators; the polymeric products being useful in protective coatings.
    Type: Application
    Filed: May 9, 2001
    Publication date: May 23, 2002
    Inventors: Albert G. Anderson, Alexei Gridnev, Graeme Moad, Ezio Rizzardo, San Hoa Thang
  • Method of controlling polymer molecular weight and structure
    Publication number: 20020058772
    Abstract: The present invention concerns the preparation of polymers of low polydispersity and/or controlled molecular weight and architecture employing living free radical polymerization initiated by an alkoxyamine initiator or nitroxide plus, optionally, a free radical initiator, the polymer produced thereby; selected nitroxide and alkoxyamine initiators; and a process for making the initiators; the polymeric products being useful in protective coatings.
    Type: Application
    Filed: May 9, 2001
    Publication date: May 16, 2002
    Inventors: Albert G. Anderson, Alexei Gridnev
  • Method of controlling polymer molecular weight and structure
    Patent number: 6388004
    Abstract: The present invention concerns the preparation of polymers of low polydispersity and/or controlled molecular weight and architecture employing living free radical polymerization initiated by an alkoxyamine initiator or nitroxide plus, optionally, a free radical initiator, the polymer produced thereby; selected nitroxide and alkoxyamine initiators; and a process for making the initiators; the polymeric products being useful in protective coatings.
    Type: Grant
    Filed: May 9, 2001
    Date of Patent: May 14, 2002
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: Albert G. Anderson, Alexei Gridnev
  • Method of macromonomer synthesis
    Patent number: 6376626
    Abstract: A free-radical polymerization process for making macromonomers having the structure: comprising contacting: (a) CH2═CHY; (b) optionally, CH2═CXB; and (c) free-radicals, produced from a free-radical source; in which B, U, X, Y, Z, m, n and p are defined in the text; macromonomer quality being controlled by adjusting one or more of the following variables: molar ratios of a, b and c; temperature; monomer concentration; and conversion.
    Type: Grant
    Filed: October 19, 1999
    Date of Patent: April 23, 2002
    Assignee: Commonwealth Scientific and Industrial Research Organization
    Inventors: John Chiefari, Graeme Moad, Ezio Rizzardo, Alexei A. Gridnev