Patents by Inventor Yoshihira Hosoyama

Yoshihira Hosoyama 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).

  • Conjugated diene compound polymerization catalyst process for the preparation of conjugated diene polymer in the presence thereof and polybutadiene thus prepared
    Patent number: 6300450
    Abstract: The present invention provides a process for the production of a conjugated diene polymer having a controlled microstructure at a high polymerization activity in the presence of a metallocene type complex of compound of transition metal of the group V of the Periodic Table. A novel catalyst is provided comprising (A) a metallocene type complex of a transition metal of the group V of the Periodic Table, (B) an ionic compound of a non-coordinating anion and a cation, (C) an organic metal compound of the groups I to III and (D) water, wherein the molar ratio of (C)/(D) is from 0.66 to 5.
    Type: Grant
    Filed: November 19, 1998
    Date of Patent: October 9, 2001
    Assignee: UBE Industries, Ltd.
    Inventors: Nobuhiro Tsujimoto, Koji Maeda, Masato Murakami, Michinori Suzuki, Yasumasa Iwamoto, Sakae Yuasa, Satoshi Bandai, Yoshihira Hosoyama, Nobuharu Hisano