Patents by Inventor Takeshi Ohazama

Takeshi Ohazama 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).

  • Multi-layer resin films having excellent oxygen gas barrier properties and process for their production
    Patent number: 6489021
    Abstract: The present invention provides a multi-layer resin film having excellent oxygen gas barrier properties, particularly even at high humidity, and further having no chlorine content. The multi-layer resin film of the present invention has a biaxially-stretched polypropylene resin film, an adhesive layer formed on at least one surface of the polypropylene resin film, and a polyvinyl alcohol resin layer formed on the adhesive layer, wherein the polyvinyl alcohol resin layer has a value of crystallinity parameter (CP (M//) ⊥) not less than 0.8. The multi-layer resin film of the present invention can be prepared by forming an adhesive layer on at least one surface of an unstretched polypropylene resin film; stretching the film in one direction; forming a polyvinyl alcohol resin layer on the adhesive layer; and stretching the film in another direction perpendicular to the direction of previous stretching.
    Type: Grant
    Filed: March 12, 2001
    Date of Patent: December 3, 2002
    Assignee: Toyo Boseki Kabushiki Kaisha
    Inventors: Yoshifumi Yamamoto, Ichiro Kitaura, Yutaka Matsumura, Noriko Takahashi, Takeshi Ohazama, Chikao Morishige
  • Multi-layer resin films having excellent oxygen gas barrier properties and process for their production
    Publication number: 20020037423
    Abstract: The present invention provides a multi-layer resin film having excellent oxygen gas barrier properties, particularly even at high humidity, and further having no chlorine content. The multi-layer resin film of the present invention has a biaxially-stretched polypropylene resin film, an adhesive layer formed on at least one surface of the polypropylene resin film, and a polyvinyl alcohol resin layer formed on the adhesive layer, wherein the polyvinyl alcohol resin layer has a value of crystallinity parameter (CP (M//) ⊥) not less than 0.8. The multi-layer resin film of the present invention can be prepared by forming an adhesive layer on at least one surface of an unstretched polypropylene resin film; stretching the film in one direction; forming a polyvinyl alcohol resin layer on the adhesive layer; and stretching the film in another direction perpendicular to the direction of previous stretching.
    Type: Application
    Filed: March 12, 2001
    Publication date: March 28, 2002
    Inventors: Yoshifumi Yamamoto, Ichiro Kitaura, Yutaka Matsumura, Noriko Takahashi, Takeshi Ohazama, Chikao Morishige