Patents by Inventor Kouichirou Asao

Kouichirou Asao 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).

  • Polypropylene resin composition, polypropylene resin foamed material and process for producing the same
    Patent number: 5616627
    Abstract: The present invention relates to a polypropylene resin composition containing about 90 to 60 parts by weight of a polypropylene block copolymer (A); and about 10 to 40 parts by weight of a polyethylene resin (B), wherein the polypropylene block copolymer is a polypropylene block copolymer which contains about 99 to 90% by weight of a crystalline polypropylene (a) and about 1 to 10% by weight of an amorphous ethylene-.alpha.-olefin copolymer (b) and has a melt flow rate (MFR) of about 2 to 15 g/10 minutes, and a die swell ratio, measured by a capillary rheometer, of at least 1.7. Foamed materials containing a fine and uniform foam are obtainable from this composition.
    Type: Grant
    Filed: July 17, 1995
    Date of Patent: April 1, 1997
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Tadashi Sakurai, Kouichirou Asao, Akinobu Sakamoto