Patents by Inventor Funio Tsutsumi

Funio Tsutsumi 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).

  • Styrene-butadiene random copolymer and process for the production thereof
    Patent number: 4367325
    Abstract: Styrene-butadiene random copolymers having an average vinyl content of at least 70%, a breadth of the distribution of vinyl contents of at least 20%, a Mooney viscosity (ML.sub.1+4, 100.degree. C.) of 10 to 150, and a styrene content of about 3 to 30% by weight. They are prepared by copolymerizing styrene and butadiene in a hydrocarbon solvent in the presence of an organolithium initiator and a Lewis base and, if necessary, an anionic surface active agent containing --SO.sub.3 M or --OSO.sub.3 M (wherein M is Na, K, Rb or Cs) under temperature-raising conditions. They are rubber materials having low rolling resistance and high wet skid resistance.
    Type: Grant
    Filed: April 15, 1981
    Date of Patent: January 4, 1983
    Assignee: Japan Synthetic Rubber Co., Ltd.
    Inventors: Yasumasa Takeuchi, Noboru Ohshima, Mitsuhiko Sakakibara, Funio Tsutsumi