Patents by Inventor Takuji Isaka

Takuji Isaka 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 polyurethane
    Patent number: 5100926
    Abstract: Disclosed herein is a process for producing polyurethane moldings having good physical properties and good receptivity of electrostatic coating, said process comprising reacting a polyoxyethylene chain-containing polyether polyol having 2-4 hydroxyl groups and a hydroxyl equivalent higher than 750 as the high-molecular weight polyol, diaminotoluene and a low-molecular weight polyol having a hydroxyl equivalent of 30-100 as the low-molecular weight, active hydrogen-containing compound, with organic polyisocyanates in specific equivalent ratios respectively. The process may advantageously applied to injection reaction molding.
    Type: Grant
    Filed: July 17, 1989
    Date of Patent: March 31, 1992
    Assignees: Toyota Jidosha Kabushiki Kaisha, Sanyo Chemical Industries, Inc.
    Inventors: Kanemitu Kondo, Takao Nomura, Junzo Ukai, Takuji Isaka, Isao Ishikawa, Kouzaburo Nagata
  • Polyisocyanurate resin and process for making the same
    Patent number: 4299924
    Abstract: High-density polyisocyanurate resins having improved rigidity, heat resistance and/or impact resistance can be obtained by reacting a polyisocyanate with a polymer polyol derived from a polyol having a molecular weight of at least 4500, and optionally a crosslinker, in the presence of trimerization catalyst, using isocyanate index of 200-5000.
    Type: Grant
    Filed: July 17, 1980
    Date of Patent: November 10, 1981
    Assignees: Toyota Jidosha Kogyo Kabushiki Kaisha, Sanyo Chemical Ind., Ltd.
    Inventors: Takao Nomura, Yoshio Taguchi, Kozaburo Nagata, Takuji Isaka