Patents by Inventor Francois Nief

Francois Nief 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).

  • Patent number: 9315590
    Abstract: The present invention relates to a novel catalytic system for polymerization, and more particularly for preparing conjugated diene polymers bearing a polar function at the chain end. This catalytic system is based on a metal salt of a rare-earth metal and, as alkylating agent, an organometallic compound based on a metal belonging to the 2nd column or the 13th column of the Periodic Table, capable of transferring a polar function to the diene elastomer during the conjugated diene polymerization step. The novel catalytic system makes it possible to reduce the steps for synthesizing a chain-end functionalized elastomer, while ensuring optimal functionalization, advantageously close or equal to 100%.
    Type: Grant
    Filed: December 10, 2012
    Date of Patent: April 19, 2016
    Assignees: COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN, MICHELIN RECHERCHE ET TECHNIQUE S.A., CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, ECOLE POLYTECHNIQUE
    Inventors: Guillaume Cortial, Pascal Le Floch, Francois Nief, Julien Thuilliez
  • Publication number: 20130274407
    Abstract: The present invention relates to a novel catalytic system for polymerization, and more particularly for preparing conjugated diene polymers bearing a polar function at the chain end. This catalytic system is based on a metal salt of a rare-earth metal and, as alkylating agent, an organometallic compound based on a metal belonging to the 2nd column or the 13th column of the Periodic Table, capable of transferring a polar function to the diene elastomer during the conjugated diene polymerization step. The novel catalytic system makes it possible to reduce the steps for synthesizing a chain-end functionalized elastomer, while ensuring optimal functionalization, advantageously close or equal to 100%.
    Type: Application
    Filed: December 10, 2012
    Publication date: October 17, 2013
    Inventors: Guillaume CORTIAL, Pascal Le Floch, Francois Nief, Julien Thuilliez
  • Patent number: 8507397
    Abstract: The present invention relates to a novel organometallic compound based on a divalent metal belonging to the 2nd column of the Periodic Table that can be used as an alkylating agent in a catalytic system based on a rare-earth metal. This novel compound corresponds to the formula: in which, M is a metal belonging to the 2nd column of the Periodic Table, chosen from Be, Mg, Sr, Ba, and Ra; R1, R2, R3 and R4 are hydrogen atoms or alkyl or aryl substituents, optionally bonded together to form at least one ring or at least one aromatic ring; R and R? denote alkyl or aryl substituents; L is a Lewis base; x is an integer from 0 to 4; m is an integer greater than or equal to 0; and n is an integer greater than or equal to 1.
    Type: Grant
    Filed: June 1, 2010
    Date of Patent: August 13, 2013
    Assignees: Campagnie Generale des Etablissements Michelin, Michelin Recherche et Technique S.A., Centre National de la Recherche Scientific, Ecole Polytechnique
    Inventors: Guillaume Cortial, Francois Nief, Julien Thuilliez, Françoise Hervagault, Elaine Le Floch, Clémence Le Floch, Paul Le Floch
  • Publication number: 20120135857
    Abstract: The present invention relates to a novel organometallic compound based on a divalent metal belonging to the 2nd column of the Periodic Table that can be used as an alkylating agent in a catalytic system based on a rare-earth metal. This novel compound corresponds to the formula: in which, M is a metal belonging to the 2nd column of the Periodic Table, chosen from Be, Mg, Sr, Ba, and Ra; R1, R2, R3 and R4 are hydrogen atoms or alkyl or aryl substituents, optionally bonded together to form at least one ring or at least one aromatic ring; R and R? denote alkyl or aryl substituents; L is a Lewis base; x is an integer from 0 to 4; m is an integer greater than or equal to 0; and n is an integer greater than or equal to 1.
    Type: Application
    Filed: June 1, 2010
    Publication date: May 31, 2012
    Applicants: SOCIETE DE TECHNOLOGIE MICHELIN, ECOLE POLYTECHNIQUE, CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, MICHELIN RECHERCHE ET TECHNIQUE S.A.
    Inventors: Guillaume Cortial, Pascal Le Floch, Françoise Hervagault, Elaine Le Floch, Clémence Le Floch, Paul Le Floch, Francois Nief, Julien Thuilliez
  • Patent number: 6927262
    Abstract: The invention relates to novel bridged biphosphole ligands according to the general formula: where R2, R3, R4 are chosen from hydrogen, alkyl, aryl or silyl, R1 is chosen from hydrogen, alkyl, aryl or halogen, R1 possibly being replaced with a direct bond between the two phosphorus atoms and T is a divalent group. The invention also relates to metallocenes obtained from these ligands. These metallocenes are useful as catalytic components for the polymerization of olefins.
    Type: Grant
    Filed: January 25, 2002
    Date of Patent: August 9, 2005
    Assignee: Atofina
    Inventors: Francois-Xavier Buzin, Francois Nief, Francois Mathey, Jean Malinge, Eliane Deschamps, Bernard Deschamps
  • Publication number: 20040260041
    Abstract: The invention relates to novel bridged biphosphole ligands according to the general formula: 1
    Type: Application
    Filed: April 8, 2004
    Publication date: December 23, 2004
    Inventors: Francois-Javier Buzin, Francois Nief, Francois Mathey, Jean Malinge, Eliane Deschamps, Bernard Deschamps