Patents by Inventor Keishi HACHIYA

Keishi HACHIYA 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).

  • VINYL ACETATE, VINYL ACETATE POLYMER, AND VINYL ALCOHOL POLYMER
    Publication number: 20230257491
    Abstract: [Problem to be solved] To provide a traceable vinyl acetate, a polymer containing the vinyl acetate, and a vinyl alcohol polymer which is a saponified product of the polymer. [Solution] Vinyl acetate having a ratio of carbon-14 to total carbon of 1.0×10?4 or more, a vinyl acetate polymer containing the vinyl acetate as a monomer unit and a vinyl alcohol polymer obtained by saponifying the vinyl acetate polymer.
    Type: Application
    Filed: June 30, 2021
    Publication date: August 17, 2023
    Applicant: KURARAY CO., LTD.
    Inventors: Yasutaka Inubushi, Keishi Hachiya, Masaki Kato, Yoshikazu Yamasaki, Makoto Okamoto, Kazuyuki Somemiya, Takafumi Izawa
  • Modified polyvinyl alcohol and production method therefor
    Patent number: 9758601
    Abstract: Provided is a modified polyvinyl alcohol containing 0.1 to 10 mol % of a monomer unit represented by formula (1) below and having a degree of polymerization exceeding 2000. This provides a modified polyvinyl alcohol an aqueous solution of which foams less and which has excellent film strength and gas barrier properties under high humidity conditions, while having excellent water solubility. [In formula (1), R1 represents a hydrogen atom or a methyl group.
    Type: Grant
    Filed: December 25, 2014
    Date of Patent: September 12, 2017
    Assignee: KURARAY CO., LTD.
    Inventors: Masaki Kato, Keishi Hachiya, Tatsuya Tanida, Keisuke Morikawa, Yusuke Amano
  • Vinyl alcohol polymer, thickening agent, stabilizer for emulsion polymerization, stabilizer for suspension polymerization, coating agent, coated article, sizing agent for fibers, sized yarn, and production method of textile
    Patent number: 9751968
    Abstract: Provided by the present invention is a PVA having highly harmonized adequate water solubility, thickening property and coating film strength, and having superior storage stability in terms of the viscosity in an aqueous solution. A vinyl alcohol polymer having a ratio (Mw (A)/Mn (A)) of the weight average molecular weight (Mw (A)) to the number average molecular weight (Mn (A)) of 3 or greater and 8 or less, and being capable of giving a vinyl alcohol polymer having a ratio (Mw/Mn) of a weight average molecular weight (Mw) to a number average molecular weight (Mn) of 2 or greater and less than 3 when treated at 40° C. for 1 hour in a sodium hydroxide solution.
    Type: Grant
    Filed: September 11, 2014
    Date of Patent: September 5, 2017
    Assignee: KURARAY CO., LTD.
    Inventors: Masaki Kato, Hideki Maki, Keishi Hachiya, Masako Kawagoe, Yoko Mori
  • MODIFIED POLYVINYL ALCOHOL AND PRODUCTION METHOD THEREFOR
    Publication number: 20160319048
    Abstract: Provided is a modified polyvinyl alcohol containing 0.1 to 10 mol % of a monomer unit represented by formula (1) below and having a degree of polymerization exceeding 2000. This provides a modified polyvinyl alcohol an aqueous solution of which foams less and which has excellent film strength and gas barrier properties under high humidity conditions, while having excellent water solubility. [In formula (1), R1 represents a hydrogen atom or a methyl group.
    Type: Application
    Filed: December 25, 2014
    Publication date: November 3, 2016
    Applicant: KURARAY CO., LTD.
    Inventors: Masaki KATO, Keishi HACHIYA, Tatsuya TANIDA, Keisuke MORIKAWA, Yusuke AMANO
  • VINYL ALCOHOL POLYMER, THICKENING AGENT, STABILIZER FOR EMULSION POLYMERIZATION, STABILIZER FOR SUSPENSION POLYMERIZATION, COATING AGENT, COATED ARTICLE, SIZING AGENT FOR FIBERS, SIZED YARN, AND PRODUCTION METHOD OF TEXTILE
    Publication number: 20160251466
    Abstract: Provided by the present invention is a PVA having highly harmonized adequate water solubility, thickening property and coating film strength, and having superior storage stability in terms of the viscosity in an aqueous solution. A vinyl alcohol polymer having a ratio (Mw (A)/Mn (A)) of the weight average molecular weight (Mw (A)) to the number average molecular weight (Mn (A)) of 3 or greater and 8 or less, and being capable of giving a vinyl alcohol polymer having a ratio (Mw/Mn) of a weight average molecular weight (Mw) to a number average molecular weight (Mn) of 2 or greater and less than 3 when treated at 40 ° C. for 1 hour in a sodium hydroxide solution.
    Type: Application
    Filed: September 11, 2014
    Publication date: September 1, 2016
    Applicant: KURARAY CO., LTD.
    Inventors: Masaki KATO, Hideki MAKI, Keishi HACHIYA, Masako KAWAGOE, Yoko MORI