Patents by Inventor Kazuhiro Chikaishi

Kazuhiro Chikaishi 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).

  • Crystalline polypropylene and crystalline polypropylene composition
    Patent number: 5141994
    Abstract: Crystalline polypropylene excellent in rigidity, heat resistance and surface hardness is disclosed, having a ratio of weight average molecular weight (Mw) to number average molecular weight (Mn) (Mw/Mn) of 10 or more, an intrinsic viscosity [.eta.] of from 0.8 to 5.0 dl/g as measured in tetralin at 135.degree. C., a cold xylene-soluble content (CXS) of not more than 4% by weight, a density (d) of 0.910 g/cm.sup.3 or more as measured at 23.degree. C., and a long period (L) (.ANG.) as measured at 25.degree. C. by a small-angle X-ray scattering method satisfying relationship:L.ltoreq.LC=6667d-5894wherein d is a density at 23.degree. C.; and Lc is a value (.ANG.) obrained by equation:Lc=6667d-5894.A crystalline polypropylene composition containing the foregoing crystalline polypropylene, which is excellent in rigidity and heat resistance, is also disclosed.
    Type: Grant
    Filed: November 6, 1989
    Date of Patent: August 25, 1992
    Assignee: Sumitomo Chemical Co., Ltd.
    Inventors: Masahiro Kakugo, Hajime Sadatoshi, Jiro Sakai, Kazuki Wakamatsu, Kazuhiro Chikaishi, Toshiro Kojima, Hideo Nomura, Tomohisa Fukao