Patents by Inventor Toyotaro Kuniyasu

Toyotaro Kuniyasu 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).

  • Method of producing of vinyl chloride-based polymer
    Patent number: 6825288
    Abstract: A method of producing a vinyl chloride-based polymer by suspension polymerization is provided, by which heat removal performed by a reflux condenser can be increased, but total heat removal performed by the jacket can be reduced, without affecting the quality of the product polymer. The method includes commencing heat removal when or after a polymerization conversion rate reaches 15%, and controlling said reflux condenser so as to remove a fixed quantity of heat per unit of time depending on the polymerization conversion rate as the polymerization process proceeds.
    Type: Grant
    Filed: February 24, 2003
    Date of Patent: November 30, 2004
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Masahiro Usuki, Toyotaro Kuniyasu, Tadashi Amano
  • Method of producing a vinyl chloride-based polymer
    Publication number: 20030162927
    Abstract: A method of producing a vinyl chloride-based polymer by suspension polymerization is provided, by which heat removal performed by a reflux condenser can be increased, but total heat removal performed by the jacket can be reduced, without affecting the quality of the product polymer. The method includes commencing heat removal when or after a polymerization conversion rate reaches 15%, and controlling said reflux condenser so as to remove a fixed quantity of heat per unit of time depending on the polymerization conversion rate as the polymerization process proceeds.
    Type: Application
    Filed: February 24, 2003
    Publication date: August 28, 2003
    Applicant: Shin-Etsu Chemical Co., Ltd.
    Inventors: Masahiro Usuki, Toyotaro Kuniyasu, Tadashi Amano