Patents by Inventor Yukiko Sho, legal representative

Yukiko Sho, legal representative 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).

  • Dispersion stabilizer for suspension polymerization of vinyl compound and method of producing the same
    Patent number: 7070731
    Abstract: The present invention provides a new dispersion stabilizer that satisfies, at a high level, the performances required for a dispersion stabilizer used for suspension polymerization. A method of producing a dispersion stabilizer that is useable for suspension polymerization of a vinyl compound and contains a vinyl alcohol polymer (A) includes producing the vinyl alcohol polymer (A) by heat-treating a vinyl alcohol polymer (B) at a temperature of 90 to 180° C. for 0.5 to 20 hours in an atmosphere in which an oxygen concentration is 8000 ppm or lower. The vinyl alcohol polymer (B) has a saponification degree of at least 60 mol % and contains a residual acetic acid group whose block character is in the range of 0.3 to 0.6.
    Type: Grant
    Filed: December 11, 2003
    Date of Patent: July 4, 2006
    Assignee: Kuraray Co., Ltd.
    Inventors: Masaki Kato, Kazuyuki Somemiya, Syunji Tago, Yoshiko Sho, legal representative, Yukiko Sho, legal representative, Masako Katayama, Yoko Nakano, Kiyohiko Sho, deceased