Patents by Inventor Sota Okumura

Sota Okumura 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).

  • Thermoplastic acrylic resin and method for producing same, and resin composition
    Patent number: 11352489
    Abstract: A thermoplastic acrylic resin is provided. The thermoplastic acrylic resin is a graft copolymer in which a stem polymer is an acrylic resin containing acrylonitrile and another ethylenically unsaturated monomer, and a branch polymer is a polymer composed of an ethylenically unsaturated monomer. The acrylonitrile is contained in an amount of 35 mass % or more and 84.5 mass % or less, the other ethylenically unsaturated monomer is contained in an amount of 15 mass % or more and 64.5 mass % or less, and the polymer composed of an ethylenically unsaturated monomer is contained in an amount of 0.5 mass % or more and 40 mass % or less. Thus, provided are a thermoplastic acrylic resin having improved melt-processability without compromising heat resistance, a method for producing the thermoplastic acrylic resin, a thermoplastic acrylic resin composition, a molded body, an acrylic fiber, and a method for producing the acrylic fiber.
    Type: Grant
    Filed: September 25, 2020
    Date of Patent: June 7, 2022
    Assignee: KANEKA CORPORATION
    Inventors: Sota Okumura, Yusuke Hirai, Takamasa Soejima
  • THERMOPLASTIC ACRYLIC RESIN AND METHOD FOR PRODUCING SAME, AND RESIN COMPOSITION
    Publication number: 20210009802
    Abstract: A thermoplastic acrylic resin is provided. The thermoplastic acrylic resin is a graft copolymer in which a stem polymer is an acrylic resin containing acrylonitrile and another ethylenically unsaturated monomer, and a branch polymer is a polymer composed of an ethylenically unsaturated monomer. The acrylonitrile is contained in an amount of 35 mass % or more and 84.5 mass % or less, the other ethylenically unsaturated monomer is contained in an amount of 15 mass % or more and 64.5 mass % or less, and the polymer composed of an ethylenically unsaturated monomer is contained in an amount of 0.5 mass % or more and 40 mass % or less. Thus, provided are a thermoplastic acrylic resin having improved melt-processability without compromising heat resistance, a method for producing the thermoplastic acrylic resin, a thermoplastic acrylic resin composition, a molded body, an acrylic fiber, and a method for producing the acrylic fiber.
    Type: Application
    Filed: September 25, 2020
    Publication date: January 14, 2021
    Applicant: KANEKA CORPORATION
    Inventors: Sota Okumura, Yusuke Hirai, Takamasa Soejima
  • Acrylic fiber for artificial hair, method for producing same, and head decoration article containing same
    Patent number: 10869514
    Abstract: Modacrylic fibers for artificial hair include a modacrylic polymer; and a condensed phosphate. The modacrylic polymer includes 29.5 to 79.5% by mass of acrylonitrile, 20 to 70% by mass of vinyl chloride and/or vinylidene chloride, and 0.5 to 5% by mass of a sulfonic acid group containing vinyl monomer, with respect to a total mass of the modacrylic polymer. A content of the condensed phosphate in the modacrylic fibers is 0.05 to 0.57% by mass.
    Type: Grant
    Filed: September 20, 2018
    Date of Patent: December 22, 2020
    Assignee: KANEKA CORPORATION
    Inventors: Takeshi Tanaka, Sota Okumura, Tomomichi Hashimoto
  • Acrylic fiber for artificial hair, manufacturing method therefor and head accessory containing same
    Patent number: 10433605
    Abstract: An acrylic fiber for artificial hair includes an acrylic polymer, wherein the acrylic polymer includes 29.5 to 79.5% by mass of acrylonitrile, 20 to 70% by mass of vinyl chloride and/or vinylidene chloride, and 0.5 to 5% by mass of a vinyl monomer comprising a sulfonic acid group. The acrylic fiber for artificial hair includes 0.3 to 2% by mass of a good solvent for the acrylic polymer and 0.1 to 5% by mass of a compound comprising an epoxy group.
    Type: Grant
    Filed: December 21, 2017
    Date of Patent: October 8, 2019
    Assignee: KANEKA CORPORATION
    Inventors: Takeshi Tanaka, Akihiro Okamoto, Tomomichi Hashimoto, Sota Okumura
  • ACRYLIC FIBER FOR ARTIFICIAL HAIR, METHOD FOR PRODUCING SAME, AND HEAD DECORATION ARTICLE CONTAINING SAME
    Publication number: 20190021425
    Abstract: Modacrylic fibers for artificial hair include a modacrylic polymer; and a condensed phosphate. The modacrylic polymer includes 29.5 to 79.5% by mass of acrylonitrile, 20 to 70% by mass of vinyl chloride and/or vinylidene chloride, and 0.5 to 5% by mass of a sulfonic acid group containing vinyl monomer, with respect to a total mass of the modacrylic polymer. A content of the condensed phosphate in the modacrylic fibers is 0.05 to 0.57% by mass.
    Type: Application
    Filed: September 20, 2018
    Publication date: January 24, 2019
    Applicant: KANEKA CORPORATION
    Inventors: Takeshi Tanaka, Sota Okumura, Tomomichi Hashimoto
  • ACRYLIC FIBER FOR ARTIFICIAL HAIR, MANUFACTURING METHOD THEREFOR AND HEAD ACCESSORY CONTAINING SAME
    Publication number: 20180116322
    Abstract: An acrylic fiber for artificial hair includes an acrylic polymer, wherein the acrylic polymer includes 29.5 to 79.5% by mass of acrylonitrile, 20 to 70% by mass of vinyl chloride and/or vinylidene chloride, and 0.5 to 5% by mass of a vinyl monomer comprising a sulfonic acid group. The acrylic fiber for artificial hair includes 0.3 to 2% by mass of a good solvent for the acrylic polymer and 0.1 to 5% by mass of a compound comprising an epoxy group.
    Type: Application
    Filed: December 21, 2017
    Publication date: May 3, 2018
    Applicant: Kaneka Corporation
    Inventors: Takeshi Tanaka, Akihiro Okamoto, Tomomichi Hashimoto, Sota Okumura