Patents by Inventor Juichi Gotoh

Juichi Gotoh 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 water-soluble polymer
    Patent number: 6818677
    Abstract: A process in which an aqueous solution of a vinyl monomer is subjected to photopolymerization to produce a water-soluble polymer which has a high molecular weight, is highly soluble in water, and reduced in unreacted monomer content is provided. The process comprises subjecting an aqueous solution of a vinyl monomer to photopolymerization with the aid of an azo compound having a 10-hour half-life decomposition temperature of 90° C. or lower as a photopolymerization initiator in such a manner that first-stage light irradiation is conducted at an irradiation intensity of 0.5 to 7 W/m2 and second-stage or subsequent light irradiation is conducted at an irradiation intensity higher than that in the first stage and in an integrated quantity of light of 70,000 J/m2 or larger.
    Type: Grant
    Filed: May 23, 2003
    Date of Patent: November 16, 2004
    Assignee: Toagosei Co., Ltd.
    Inventors: Kenji Ito, Tetsuya Tsuzuki, Juichi Gotoh, Susumu Miho