Patents by Inventor Yasuhiro Shigematsu

Yasuhiro Shigematsu 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).

  • Aqueous emulsion-type pressure sensitive adhesives
    Patent number: 4939190
    Abstract: An aqueous emulsion-type pressure sensitive adhesive characterized in that the aqueous emulsion is prepared by(i) a first step of emulsion polymerizing an ethylenically unsaturated monomer composed essentially of at least one type of styrene, alpha-methylstyrene, acrylonitrile, methyl methacrylate and vinyltoluene in the presence of an emulsion composed of at least one tackifier resin selected from a rosin ester, a petroleum resin and a terpene resin to form an aqueous emulsion containing particles of a two-layered structure having a core layer of the tackifier resin and a layer of a polymer (polymer A.sub.
    Type: Grant
    Filed: May 24, 1988
    Date of Patent: July 3, 1990
    Assignee: Dainippon Ink And Chemicals, Inc.
    Inventors: Reizaburo Tomioka, Yasuhiro Shigematsu