Patents by Inventor Michitaka ISE

Michitaka ISE 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).

  • Bisphenol composition and method for producing same, and polycarbonate resin and method for producing same
    Patent number: 11634373
    Abstract: Provided is a thermally stable bisphenol composition whose increase in the Hazen color number is suppressed even under higher temperature conditions. A bisphenol composition including an aryl alkyl sulfide or a dialkyl disulfide at 0.1 ppb by mass to 1% by mass with respect to a bisphenol. A bisphenol composition including an aryl alkyl sulfide or a dialkyl disulfide at a predetermined ratio is thermally stable in terms of the Hazen color number, and shows no coloring problem under high temperature conditions. By using such a bisphenol composition, a polycarbonate resin having an excellent color tone can be produced.
    Type: Grant
    Filed: February 21, 2020
    Date of Patent: April 25, 2023
    Assignee: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Kei Uchiyama, Kazuhisa Hatakeyama, Makoto Nakamura, Toshio Uchibori, Michitaka Ise
  • BISPHENOL COMPOSITION AND METHOD FOR PRODUCING SAME, AND POLYCARBONATE RESIN AND METHOD FOR PRODUCING SAME
    Publication number: 20200190003
    Abstract: Provided is a thermally stable bisphenol composition whose increase in the Hazen color number is suppressed even under higher temperature conditions. A bisphenol composition including an aryl alkyl sulfide or a dialkyl disulfide at 0.1 ppb by mass to 1% by mass with respect to a bisphenol. A bisphenol composition including an aryl alkyl sulfide or a dialkyl disulfide at a predetermined ratio is thermally stable in terms of the Hazen color number, and shows no coloring problem under high temperature conditions. By using such a bisphenol composition, a polycarbonate resin having an excellent color tone can be produced.
    Type: Application
    Filed: February 21, 2020
    Publication date: June 18, 2020
    Applicant: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Kei UCHIYAMA, Kazuhisa HATAKEYAMA, Makoto NAKAMURA, Toshia UCHIBORI, Michitaka ISE