Patents by Inventor Katsuhiko Tasaka

Katsuhiko Tasaka 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).

  • Process for producing hydrocarbon resin and pressure-sensitive adhesives containing same
    Patent number: 3963653
    Abstract: A process for producing a hydrocarbon resin (C) which comprises copolymerizing 100 parts by weight of vinyl aromatic hydrocarbons (A) containing more than 80% by weight isopropenyltoluene and from about 5 to 100 parts by weight of a fraction (B) which is the by-product of cracking or refining petroleum and mainly comprising unsaturated hydrocarbons having a boiling point ranging from about -15.degree.C to 45.degree.C and having 4 to 5 carbon atoms in the presence of a Friedel-Crafts catalyst and pressure-sensitive adhesives comprising the hydrocarbon resin produced in combination with a rubber.
    Type: Grant
    Filed: June 17, 1975
    Date of Patent: June 15, 1976
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Shigeru Katayama, Izuru Yokoyama, Katsuhiko Tasaka
  • Process for producing hydrocarbon resin and pressure-sensitive adhesives containing same
    Patent number: 3931125
    Abstract: A process for producing a hydrocarbon resin (C) which comprises copolymerizing 100 parts by weight of vinyl aromatic hydrocarbons (A) containing more than 80% by weight isopropenyltoluene and from about 5 to 100 parts by weight of a fraction (B) which is the by-product of cracking or refining petroleum and mainly comprising unsaturated hydrocarbons having a boiling point ranging from about -15.degree.C to 45.degree.C and having 4 to 5 carbon atoms in the presence of a Friedel-Crafts catalyst and pressure-sensitive adhesives comprising the hydrocarbon resin produced in combination with a rubber.
    Type: Grant
    Filed: March 19, 1974
    Date of Patent: January 6, 1976
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Shigeru Katayama, Izuru Yokoyama, Katsuhiko Tasaka