Patents by Inventor Tuneyuki Ohkubo

Tuneyuki Ohkubo 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).

  • NOVEL PHOSPHAZENE-SUPPORTED CATALYST, NOVEL COMPOUND THEREOF AND USE THEREOF
    Publication number: 20110288240
    Abstract: A phosphazene-supported catalyst in which a support is bonded to a group represented by the general formula (1): wherein n, Zn?, a, b, c, d, R, R1 and D are all defined. The phosphazene-supported catalyst is highly effective to catalyze various organic reactions, and further has no reduction of activity even after recovery and reuse of the catalyst, thus it being economically advantageous. In addition, the polymerization of cyclic monomers, substitution of substituents, carbon-carbon bond forming reactions and the like can be conducted with extremely high efficiency.
    Type: Application
    Filed: August 4, 2011
    Publication date: November 24, 2011
    Applicant: Mitsui Chemicals, Inc.
    Inventors: Naritoshi YOSHIMURA, Shinji Kiyono, Kazumi Mizutani, Isao Hara, Takaomi Hayashi, Tadahito Nobori, Yoshihiro Yamamoto, Miyuki Konno, Yoshihisa Inoue, Akira Matsuura, Tuneyuki Ohkubo
  • Novel Phosphazene-Supported Catalyst, Novel Compound Thereof and Use Thereof
    Publication number: 20080318767
    Abstract: A phosphazene-supported catalyst in which a support is bonded to a group represented by the general formula (1): wherein n, Zn?, a, b, c, d, R, R1 and D are all defined. The phosphazene-supported catalyst is highly effective to catalyze various organic reactions, and further has no reduction of activity even after recovery and reuse of the catalyst, thus it being economically advantageous. In addition, the polymerization of cyclic monomers, substitution of substituents, carbon-carbon bond forming reactions and the like can be conducted with extremely high efficiency.
    Type: Application
    Filed: June 28, 2005
    Publication date: December 25, 2008
    Applicant: Mitsui Chemicals, Inc.
    Inventors: Naritoshi Yoshimura, Shinji Kiyono, Kazumi Mizutani, Isao Hara, Takaomi Hayashi, Tadahito Nobori, Yoshihiro Yamamoto, Miyuki Konno, Yoshihisa Inoue, Akira Matsuura, Tuneyuki Ohkubo
  • Process for preparing bisphenol A
    Patent number: 5631338
    Abstract: The present invention provides a process for preparing bisphenol A with a high conversion and selectivity by reacting phenol with acetone in the presence of both a polyorganosiloxane having a mercapto group-containing hydrocarbon group and an acid. It is preferable that the polyorganosiloxane having a mercapto group-containing hydrocarbon group and the acid is a polyorganosiloxane having both a mercapto group-containing hydrocarbon group and a sulfonic acid group.
    Type: Grant
    Filed: July 11, 1995
    Date of Patent: May 20, 1997
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Kaoru Inoue, Tuneyuki Ohkubo, Takashi Terajima