Patents by Inventor Kayo Tsuchiya

Kayo Tsuchiya 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 cyclic polyarylene sulfide
    Patent number: 8329832
    Abstract: A method for producing a cyclic polyarylene sulfide, wherein a cyclic polyarylene sulfide is produced by heating a reaction mixture which is composed of at least a linear polyarylene sulfide (a), a sulfidizing agent (b), a dihalogenated aromatic compound (c) and an organic polar solvent (d). This method for producing a cyclic polyarylene sulfide is characterized in that not less than 1.25 liters of the organic polar solvent is used per 1 mole of the sulfur content in the reaction mixture. This method enables to efficiently produce a cyclic polyarylene sulfide, more specifically cyclic oligoarylene sulfide by an economical and simple process in short time.
    Type: Grant
    Filed: February 27, 2008
    Date of Patent: December 11, 2012
    Assignee: Toray Industries, Inc.
    Inventors: Shunsuke Horiuchi, Kohei Yamashita, Kayo Tsuchiya, Koji Yamauchi