Patents by Inventor Shigeyuki Nozaki

Shigeyuki Nozaki 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).

  • Production method of N-vinyl-2-pyrrolidone
    Patent number: 9096516
    Abstract: A method for producing N-vinyl-2-pyrrolidone by crystallization including: controlling a water content in a feed N-vinyl-2-pyrrolidone solution at an inlet of a crystallizer so as to be not lower than 0.7% by weight and not higher than 10% by weight based on the total weight of the N-vinyl-2-pyrrolidone solution; and supplying the feed N-vinyl-2-pyrrolidone solution to a crystallization process.
    Type: Grant
    Filed: May 17, 2011
    Date of Patent: August 4, 2015
    Assignee: NIPPON SHOKUBAI CO., LTD.
    Inventors: Hideto Sugiura, Toru Inaoka, Shigeyuki Nozaki, Yoshihisa Oka
  • PRODUCTION METHOD OF N-VINYL-2-PYRROLIDONE
    Publication number: 20110218344
    Abstract: A method for producing N-vinyl-2-pyrrolidone by crystallization including: controlling a water content in a feed N-vinyl-2-pyrrolidone solution at an inlet of a crystallizer so as to be not lower than 0.7% by weight and not higher than 10% by weight based on the total weight of the N-vinyl-2-pyrrolidone solution; and supplying the feed N-vinyl-2-pyrrolidone solution to a crystallization process.
    Type: Application
    Filed: May 17, 2011
    Publication date: September 8, 2011
    Applicant: NIPPON SHOKUBAI CO., LTD.
    Inventors: Hideto SUGIURA, Toru Inaoka, Shigeyuki Nozaki, Yoshihisa Oka
  • Production Method of N-Vinyl-2-Pyrrolidone
    Publication number: 20090088579
    Abstract: High-purity NVP can be produced by comprising at least two crystallization processes and supplying the mother liquor from the first crystallization process to the second crystallization process. Further, high-purity NVP can be obtained continuously and stably without plugging caused by depositing of crystals on the heat transfer surface of a crystallizer by controlling the water content in a feed NVP solution at the inlet of the crystallizer so as to be not lower than 0.7% by weight and not higher than 10% by weight.
    Type: Application
    Filed: April 7, 2006
    Publication date: April 2, 2009
    Applicant: NIPPON SHOKUBAI CO., LTD.
    Inventors: Hideto Sugiura, Toru Inaoka, Shigeyuki Nozaki, Yoshihisa Oka
  • Method for production of water-soluble porous polymer and water-soluble porous polymer
    Publication number: 20060173088
    Abstract: A method for efficient production of a water-soluble porous polymer and a water-soluble porous polymer excelling in solubility in water are provided. A method for the production of the polymer is characterized by the fact that an aqueous monomer solution containing an ethylenically unsaturated monomer is polymerized while it is containing bubbles therein. The method can simplify the drying and crushing steps and the water-soluble porous polymer consequently obtained excels in solubility in water.
    Type: Application
    Filed: July 16, 2004
    Publication date: August 3, 2006
    Inventors: Shigeyuki Nozaki, Daisuke Imai, Satoshi Yamada, Shuichi Toriya, Hidekazu Kozuki, Masaru Ishikawa