Patents by Inventor Tuneyuki Ohsawa

Tuneyuki Ohsawa 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).

  • Spherical particles of thermosetting phenolic resin and process for producing the same
    Patent number: 4839445
    Abstract: The present invention relates to a process for producing spherical thermosetting phenolic resin particles having a size of no larger than about 1,000 microns, and the spherical thermosetting phenolic resin particles produced by this process.In accordance with the process of the present invention, a novolak resin, and a nitrogenous basic compound, and, optionally, an aldehyde, are reacted while they are suspended in an aqueous medium in the presence of a suspension stabilizer.The thermosetting phenolic resin produced by the process of the present invention not only displays superior thermal curing characteristics during molding; the cured product fabricated by molding this resin also exhibits good physical properties such as improved mechanical strength and heat resistance. Therefore, the spherical thermosetting phenolic resin particles produced by the process of the present invention can be extensively used as molding materials, binders, adhesives, and in many other applications.
    Type: Grant
    Filed: January 6, 1988
    Date of Patent: June 13, 1989
    Assignee: Unitika, Ltd.
    Inventors: Yoshiaki Echigo, Kenichi Sugawara, Mutsunori Yamao, Yoshiyuki Suematu, Keiichi Asami, Tuneyuki Ohsawa