Patents by Inventor Norio Tomotsu

Norio Tomotsu 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 preparation of aluminoxane
    Patent number: 4996338
    Abstract: The present invention relates to a process for preparing aluminoxane which comprises reacting an organoaluminum compound and water in a solvent system containing solvent having a higher boiling point than that of the organoaluminum compound, or reacting an organoaluminum compound and water, and then adding a solvent system containing the solvent having a higher boiling point than that of the organoaluminum compound to the reaction mixture; and thereafter condensing the resulting reaction mixture under atmospheric pressure or reduced pressure.
    Type: Grant
    Filed: January 29, 1990
    Date of Patent: February 26, 1991
    Assignee: Idemitsu Kosan Company Limited
    Inventors: Hiroshi Maezawa, Norio Tomotsu
  • Process for producing styrene-based polymers and catalyst for use therein
    Patent number: 4978730
    Abstract: A process for producing styrene-based polymers having mainly syndiotactic configuration in the presence of a catalyst comprising (A) a titanium compound and (B) a contact product of a methyl group-containing organoaluminum compound and water, wherein the contact product (B) has a high magnetic field component of not more than 50% in the methyl proton signal region due to an aluminum-methyl group (Al--CH.sub.3) bond as determined by the proton nuclear magnetic resonance absorption method.According to this process, styrene-based polymers having mainly syndiotactic configuration can be efficiently and economically produced.
    Type: Grant
    Filed: November 21, 1988
    Date of Patent: December 18, 1990
    Assignee: Idemitsu Kosan Company Limited
    Inventors: Hiroshi Maezawa, Norio Tomotsu, Masahiko Kuramoto