Patents by Inventor Shigeki Kiriyama

Shigeki Kiriyama 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 producing polyphenylene ether, dispersing polyether in aqueous medium and heating dispersion
    Patent number: 4895929
    Abstract: A process for producing a polyphenylene ether is disclosed, comprising oxidatively polymerizing a phenol in an organic solvent in the presence of a catalyst for oxidative polymerization, finely dispersing the resulting polyphenylene ether containing the organic solvent in an aqueous dispersion medium containing an acid compound, and heating the aqueous dispersion to remove the solvent from the polyphenylene ether. The resulting polyphenylene ether has excellent powder properties and contains a reduced amount of a catalyst residue.
    Type: Grant
    Filed: June 25, 1987
    Date of Patent: January 23, 1990
    Assignees: Mitsubishi Petrochemical Co., Ltd., Sumitomo Chemical Company, Ltd.
    Inventors: Katsuhiro Abe, Kazunori Yano, Ryuhei Matsui, Shigeki Kiriyama, Yoshiharu Tatsukami, Kenji Nagaoka
  • Aqueous dispersion of olefin resins and continuous process for preparing thereof
    Patent number: 4320041
    Abstract: Aqueous dispersions of olefin resins having a low film-forming temperature can be continuously produced by homogeneously mixing a mixture composed of olefin resin, partially saponified polyvinyl alcohol and water by means of an extruder having a multi-screw, and extruding the resulting dispersion.If partially saponified polyvinyl alcohol in which residual acetic acid groups are blocked is used, the film-forming temperature thereof is effectively lowered.
    Type: Grant
    Filed: June 19, 1980
    Date of Patent: March 16, 1982
    Assignee: Mitsubishi Petrochemical Co., Ltd.
    Inventors: Katsuhiro Abe, Mitsuo Tsuruoka, Shigeki Kiriyama, Kazunobu Nakamori