Patents by Inventor Kazunari Igarashi

Kazunari Igarashi 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 suspension polymerization of vinyl compound
    Patent number: 5349008
    Abstract: Disclosed herein is a process for suspension polymerization of a vinyl polymer which comprises using as the suspending agent a polyvinyl ester polymer having an ionic group at an end thereof or a polyvinyl alcohol polymer having a degree of hydrolysis of 90 mol % or less which is obtained by hydrolysis of the above polyvinyl ester polymer.According to the above-mentioned process, vinyl polymer granules having a sharp granulometric dispersion, high bulk density, high plasticizer absorption and low vinyl monomer residue are obtained.
    Type: Grant
    Filed: December 4, 1991
    Date of Patent: September 20, 1994
    Assignee: Kuraray Co., Ltd.
    Inventors: Shigeki Takada, Ken Yuki, Hitoshi Maruyama, Taku Tanaka, Kazunari Igarashi