Patents by Inventor Koji Yakan

Koji Yakan 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).

  • Pressure sensitive adhesive products and the method for preparation of the same
    Patent number: 4425176
    Abstract: Pressure sensitive adhesive products or articles having one or more release layers and a pressure sensitive adhesive layer, said one or more release layer comprising a polyolefinic elastomer having a shearing modulus of less than 2.0.times.10.sup.8 dyne/cm.sup.2 and surface wettability expressed in terms of an equilibrium contact angle of more than 55.degree. with respect to a standard liquid, and said adhesive layer being composed mainly of a polyacrylate. To increase the adhesion between the release layer and a backing substrate, a reinforcing interlayer may be used. As the release layer, a mixture of the polyolefinic elastomer and polyethylene may be used. The release layer is then kept in contact with the adhesive layer over a given area to form a composite or integral layer thereof as by extrusion coating.
    Type: Grant
    Filed: March 19, 1982
    Date of Patent: January 10, 1984
    Assignee: Sanyo-Kokusaku Pulp Co., Ltd.
    Inventors: Tomishi Shibano, Sachio Maruchi, Koji Yakan, Tadashi Kobayashi, Saburo Akimoto
  • Pressure sensitive adhesive products
    Patent number: 4339485
    Abstract: Pressure sensitive adhesive products or articles having one or more release layers and a pressure sensitive adhesive layer, said one or more release layer comprising a polyolefinic elastomer having a shearing modulus of less than 2.0.times.10.sup.8 dyne/cm.sup.2 and surface wettability expressed in terms of an equilibrium contact angle of more than 55.degree. with respect to a standard liquid, and said adhesive layer being composed mainly of a polyacrylate. To increase the adhesion between the release layer and a backing substrate, a reinforcing interlayer may be used. As the release layer, a mixture of the polyolefinic elastomer and polyethylene may be used. The release layer is then kept in contact with the adhesive layer over a given area to form a composite or integral layer thereof as by extrusion coating.
    Type: Grant
    Filed: November 2, 1979
    Date of Patent: July 13, 1982
    Assignee: Sanyo-Kokusaku Pulp Co., Ltd.
    Inventors: Tomishi Shibano, Sachio Maruchi, Koji Yakan, Tadashi Kobayashi, Saburo Akimoto