Patents by Inventor Shojiro Kaito

Shojiro Kaito 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).

  • Catalyst composition
    Patent number: 6596828
    Abstract: A catalyst composition for polymerization of a conjugated diene or copolymerization of a conjugated diene and an aromatic vinyl compound, which comprises the following components: (A) a metallocene-type complex of a rare earth metal compound (samarium complex etc.), and (B) an ionic compound composed of a non-coordinate anion and a cation (triphenylcarbonium tetrakis(pentafluorophenyl) borate etc.) and/or an aluminoxane. The catalyst composition producing a polymer having a high cis-1,4-configuration content in the microstructure and a narrow molecular weight distribution.
    Type: Grant
    Filed: March 16, 2001
    Date of Patent: July 22, 2003
    Assignee: Riken
    Inventors: Shojiro Kaito, Zhaomin Hou, Yasuo Wakatsuki