Patents Assigned to Okayama Paper Mill Co., Ltd.
  • Cold-set adhesive compositions comprising polyvinyl alcohol for paper and paper board
    Patent number: 4442252
    Abstract: Adhesives prepared by dissolving polyvinyl alcohol, a filler and a water-soluble boron compound in water are described. These adhesives are "cold-set" adhesives which are liquid at a temperature of 60.degree. C. or more, but lose their fluidity to gelatinize on cooling at a temperature higher than 20.degree. C., they are very useful for a cold corrugation system.
    Type: Grant
    Filed: April 8, 1982
    Date of Patent: April 10, 1984
    Assignees: Unitika Ltd., Okayama Paper Mill Co., Ltd.
    Inventors: Masao Sumi, Junichi Suenaga, Masazo Takenaka, Itaru Murano, Mikio Tanabe, Kiyoshi Hirai