Patents by Inventor Keizo Shima

Keizo Shima 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).

  • Hot-melt adhesive compositions
    Patent number: 4148775
    Abstract: A novel hot-melt adhesive composition comprising 100 parts by weight of a polyamide copolymer resin having a melting point of about 80.degree. to about 160.degree. C. and composed of at least three monomers, about 5 to about 30 parts by weight of a terpene-phenol resin having a softening point of about 80.degree. to about 120.degree. C., and about 5 to about 10 parts by weight of a plasticizer.
    Type: Grant
    Filed: April 17, 1978
    Date of Patent: April 10, 1979
    Assignee: Daicel Ltd.
    Inventors: Keizo Shima, Yuichi Harada, Yoshinobu Ohya
  • Process for the manufacture of antistatic and biaxially oriented polypropylene film
    Patent number: 4000102
    Abstract: An antistatic and biaxially oriented polypropylene film is manufactured by the steps of (1) adding to crystalline polypropylene, (a) an antistatic agent and (b) a zinc salt of aliphatic acid, (2) melt-extruding the resulting composition to form a sheet or film, (3) orienting the sheet or film both longitudinally and laterally at a temperature below its melting point, and then (4) activating the surface of the resultant antistatic and biaxially oriented film. The film thus obtained possesses a remarkably improved antistatic property and adhesiveness to ink printed on it and to resins coated on it.
    Type: Grant
    Filed: December 11, 1974
    Date of Patent: December 28, 1976
    Assignee: Daicel, Ltd.
    Inventors: Keizo Shima, Seizi Iwamiya, Hirosi Yano