Patents by Inventor Masaharu Tokoro

Masaharu Tokoro 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).

  • Process for producing hydrogenated product of cyclic olefin polymer prepared through ring-opening polymerization
    Patent number: 6908970
    Abstract: A process for producing a hydrogenated product of a polymer prepared through ring-opening polymerization which comprises a polymerization step of polymerizing a cyclic olefin through ring-opening polymerization in the presence of a polymerization catalyst comprising an organoruthenium compound or an organoosmium compound to prepare a polymer, and a hydrogenation step of adding a hydrogenation catalyst and hydrogen into a polymerization system resulting from the polymerization step to hydrogenate the carbon-carbon double bonds of the polymer prepared through the ring-opening polymerization. When the organoruthenium compound- or organoosmium compound-containing catalyst further comprises a carbene compound, the catalyst exhibits a higher activity for the ring-opening polymerization.
    Type: Grant
    Filed: October 7, 2002
    Date of Patent: June 21, 2005
    Assignee: Zeon Corporation
    Inventors: Yasuo Tsunogae, Masato Sakamoto, Masaharu Tokoro, Kazunori Taguchi
  • Process for producing hydrogenated product of cyclic olefin polymer prepared through ring-opening polymerization
    Publication number: 20030050406
    Abstract: A process for producing a hydrogenated product of a polymer prepared through ring-opening polymerization which comprises a polymerization step of polymerizing a cyclic olefin through ring-opening polymerization in the presence of a polymerization catalyst comprising an organoruthenium compound or an organoosmium compound to prepare a polymer, and a hydrogenation step of adding a hydrogenation catalyst and hydrogen into a polymerization system resulting from the polymerization step to hydrogenate the carbon-carbon double bonds of the polymer prepared through the ring-opening polymerization. When the organoruthenium compound- or organoosmium compound-containing catalyst further comprises a carbene compound, the catalyst exhibits a higher activity for the ring-opening polymerization.
    Type: Application
    Filed: October 7, 2002
    Publication date: March 13, 2003
    Applicant: ZEON CORPORATION
    Inventors: Yasuo Tsunogae, Masato Sakamoto, Masaharu Tokoro, Kazunori Taguchi
  • Thermoplastic dicyclopentadiene-base open-ring polymers, hydrogenated derivatives thereof, and processes for the preparation of both
    Patent number: 6511756
    Abstract: A thermoplastic dicyclopentadiene ring-opening polymer obtained by ring-opening polymerization of a monomer component containing a dicyclopentadiene monomer, characterized in that polycyclic rings which are repeating units of the polymer are bonded in cis-position relative to the carbon-carbon double bond of the main chain of the polymer in 50 mol % or more of the repeating units based on the total repeating units and the content of a low-molecular weight component of 2,000 or less in molecular weight is 10% by weight or less based on the total polymer components, and a hydrogenation product obtained by hydrogenating the carbon-carbon unsaturated bond of the thermoplastic dicyclopentadiene ring-opening polymer.
    Type: Grant
    Filed: April 24, 2000
    Date of Patent: January 28, 2003
    Assignee: Nippon Zeon Co., Ltd.
    Inventors: Kazuyuki Obuchi, Masaharu Tokoro, Teruhiko Suzuki, Hajime Tanisho, Kenji Otoi
  • Process for producing hydrogenated ring-opening polymerization polymer of cycloolefin
    Patent number: 6486264
    Abstract: A process for producing a hydrogenated product of a polymer prepared through ring-opening polymerization which comprises a polymerization step of polymerizing a cyclic olefin through ring-opening polymerization in the presence of a polymerization catalyst comprising an organoruthenium compound or an organoosmium compound to prepare a polymer, and a hydrogenation step of adding a hydrogenation catalyst and hydrogen into a polymerization system resulting from the polymerization step to hydrogenate the carbon-carbon double bonds of the polymer prepared through the ring-opening polymerization. When the organoruthenium compound- or organoosmium compound-containing catalyst further comprises a carbene compound, the catalyst exhibits a higher activity for the ring-opening polymerization.
    Type: Grant
    Filed: November 30, 2001
    Date of Patent: November 26, 2002
    Assignee: Zeon Corporation
    Inventors: Yasuo Tsunogae, Masato Sakamoto, Masaharu Tokoro, Kazunori Taguchi