Patents by Inventor Shunichi Ozutsumi

Shunichi Ozutsumi 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 foamable polyolefin particles
    Patent number: 4429059
    Abstract: The present invention is directed to a process for producing foamable polyolefin particles comprising adding a mixture of 3 to 15 parts by weight of a blowing agent and 0.5 to 5 parts by weight of a blowing aid to 100 parts by weight of polyolefin particles maintained in a fluid state. The addition of the mixture of blowing agent and blowing aid is conducted under substantially anhydrous conditions, which result in the blowing agent being present in the particles in a gas phase and not a liquid phase. Polyolefin particles comprise polyolefin resin with vinylaromatic resin chemically bonded thereto.
    Type: Grant
    Filed: May 16, 1983
    Date of Patent: January 31, 1984
    Assignee: Sekisui Kaseihin Kogyo Kabushiki Kaisha
    Inventors: Shunichi Ozutsumi, Osamu Yamamoto