Patents by Inventor Yoichi F. Ozawa

Yoichi F. Ozawa 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).

  • Functionalized high -1,4-polybutadiene prepared using novel functionalizing agents
    Patent number: 8618199
    Abstract: A method for preparing a functionalized polymer comprising the steps of preparing a polymer by polymerizing conjugated diene monomer with a lanthanide-based catalyst, wherein the lanthanide-based catalyst comprises (a) a lanthanide compound, (b) an alkylating agent, and (c) a source of halogen, and reacting the pseudo-living polymer with at least one amide-containing functionalizing agent.
    Type: Grant
    Filed: December 12, 2012
    Date of Patent: December 31, 2013
    Inventors: Yoichi F. Ozawa, H. Jerrold Miller, Koji Masaki, Koichi Morita, Tatsuo Fujimaki, Tetsuya Omura, Takuo Sone, Iwakazu Hattori
  • Preparation of syndiotactic 1, 2-polybutadiene using a chromium-containing catalyst system
    Patent number: 6201080
    Abstract: The instant invention teaches a method for forming a syndiotactic 1,2-polybutadiene product having a syndiotacticity of more than 66.5% and a melting temperature of more than about 100° C. The method includes polymerizing 1,3-butadiene in solution with a solvent, in the presence of catalytically effective amounts of: (a) an organomagnesium compound; (b) a chromium compound; and, (c) a dihydrocarbyl hydrogen phosphite. The present invention also contemplates a product of the method and an article made from the product.
    Type: Grant
    Filed: December 23, 1997
    Date of Patent: March 13, 2001
    Assignee: Bridgestone Corporation
    Inventors: Steven X. L. Luo, Yoichi F. Ozawa, James E. Hall, Jung W. Kang