Patents by Inventor Yves Gnanou

Yves Gnanou 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).

  • Polymerization in the presence of a &bgr;-substituted nitroxide radical
    Patent number: 6255448
    Abstract: The invention relates to a process for the polymerization or copolymerization of at least one monomer which is polymerizable by the radical route in the presence of a stable free radical from the nitroxide family. The stable free radical is &bgr;-substituted and provides excellent control of polydispersity while ensuring a better rate of polymerization or copolymerization, if they are compared with the stable free radicals used in the prior art.
    Type: Grant
    Filed: May 22, 1997
    Date of Patent: July 3, 2001
    Assignee: Atofina
    Inventors: Sandra Grimaldi, François Lemoigne, Jean-Pierre Finet, Paul Tordo, Pascal Nicol, Muriel Plechot, Yves Gnanou
  • INITIATION SYSTEM COMPRISING AN AMINO ALCOHOLATE LIGAND FOR ANIONIC COPOLYMERIZATION OF (METH)ACRYLIC MONOMERS AND PROCESS USING SAME
    Publication number: 20010003726
    Abstract: The initiation system is composed of at least one initiator and at least one amino alcoholate of the formula: 1
    Type: Application
    Filed: April 10, 1998
    Publication date: June 14, 2001
    Inventors: JEROME MARCHAL, YVES GNANOU, MICHEL FONTANILLE
  • Process for manufacturing multisequence star or network polycondensates by di- or multi-aldehyde coupling, and polycondensates obtained
    Patent number: 5395884
    Abstract: A novel process for coupling living polymers containing terminal (meth)acrylic units, which enables an increase in molecular weight and/or a defined multi-sequencing and/or a star structure with a defined number of branches, is disclosed. The disclosed process comprises the steps of: (i) anionic polymerization using an initiator system consisting of a bi-functional initiator and a ligand to obtain a living polymer containing living terminal (meth)acrylics units; (ii) reacting it with an aldehyde compound of formula R--(CHO).sub.r in which r>2; and (iii) recovering the final polycondensate by means known per se.
    Type: Grant
    Filed: April 28, 1994
    Date of Patent: March 7, 1995
    Assignee: Elf Atochem S.A.
    Inventor: Yves Gnanou
  • Process for manufacturing multisequence star or network polycondensates by di- or multi-aldehyde coupling, and polycondensates obtained
    Patent number: 5346956
    Abstract: A novel process for coupling living polymers containing terminal (meth)acrylic units, which enables an increase in molecular weight and/or a defined multisequencing and/or a star structure with a defined number of branches, is disclosed. The disclosed process comprises the steps of: (i) anionic polymerization using an initiator system consisting of a functional initiator and a ligand to obtain a living polymer containing living terminal (meth)acrylics units; (ii) reacting it with an aldehyde compound of formula R--(CHO).sub.r in which r.gtoreq.2; and (iii) recovering the final polycondensate by means known per se.
    Type: Grant
    Filed: January 11, 1993
    Date of Patent: September 13, 1994
    Assignee: Elf Atochem S.A.
    Inventor: Yves Gnanou
  • Polyurethane hydrogels and process for their manufacture
    Patent number: 4644033
    Abstract: The hydrogels consist essentially of the polyurethane of polyoxyethylene. The crosslinking is carried out by a reaction of a polyfunctional isocyanate with the polyoxyethylene in solution in a non-aqueous solvent. Transparent hydrogels are obtained, having a high swelling ratio in the presence of water and good mechanical properties.
    Type: Grant
    Filed: May 23, 1985
    Date of Patent: February 17, 1987
    Assignee: Essilor International
    Inventors: Yves Gnanou, Gerard Hild