Patents by Inventor Kunihiro Iwaizumi

Kunihiro Iwaizumi 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 dispersion of urethane vinyl composite resin
    Patent number: 5652291
    Abstract: An aqueous dispersion containing urethane vinyl composite resin which exhibits superior dispersability properties. The composite resin is obtained by graft polymerizing vinyl monomers with dispersable polyurethane. The polyurethane exhibits an acid value of at least 20. The dispersable polyurethane is obtained by reacting a urethane prepolymer having isocyanate groups at its end with a polyol compound obtained by the semi-esterification of polycarboxylic acid with benzene rings or its anhydride with trimethylol ethane or trimethylol propane. The urethane prepolymer is produced by reacting polyol compounds with poly-isocyanate compounds and ranges in molecular weight of from about 800 to 3000.
    Type: Grant
    Filed: July 14, 1995
    Date of Patent: July 29, 1997
    Assignee: Seiko Chemical Industries Co., Ltd.
    Inventors: Shinichi Oshita, Kunihiro Iwaizumi, Iwao Sugiyama