Patents by Inventor Yoshinori Shiojiri

Yoshinori Shiojiri 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 process of granular poly(arylene sulfide)
    Patent number: 8609790
    Abstract: The invention provides a production process of a granular poly(arylene sulfide) by polymerizing a sulfur source and a dihalo-aromatic compound in an organic amide solvent by a polymerization process containing a phase-separation polymerization step, wherein the production process contains a step I of adding an aromatic compound in a proportion of 0.01 to 20 mol per 100 mol of the organic amide solvent into the liquid phase containing the organic amide solvent and a formed polymer within the polymerization reaction system, said liquid phase being in the phase-separated state, after the phase-separation polymerization step; a step II of cooling the liquid phase within the polymerization reaction system; and a step III of collecting the formed polymer from the liquid phase.
    Type: Grant
    Filed: June 10, 2009
    Date of Patent: December 17, 2013
    Assignee: Kureha Corporation
    Inventors: Kenji Suzuki, Tomoyoshi Koizumi, Yoshinori Shiojiri
  • Production Process of Granular Poly(Arylene Sulfide)
    Publication number: 20110178268
    Abstract: The invention provides a production process of a granular poly(arylene sulfide) by polymerizing a sulfur source and a dihalo-aromatic compound in an organic amide solvent by a polymerization process containing a phase-separation polymerization step, wherein the production process contains a step I of adding an aromatic compound in a proportion of 0.01 to 20 mol per 100 mol of the organic amide solvent into the liquid phase containing the organic amide solvent and a formed polymer within the polymerization reaction system, said liquid phase being in the phase-separated state, after the phase-separation polymerization step; a step II of cooling the liquid phase within the polymerization reaction system; and a step III of collecting the formed polymer from the liquid phase.
    Type: Application
    Filed: June 10, 2009
    Publication date: July 21, 2011
    Inventors: Kenji Suzuki, Tomoyoshi Koizumi, Yoshinori Shiojiri