Patents by Inventor Yuta YAMADOI

Yuta YAMADOI 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).

  • Method for producing glycolide
    Patent number: 11753391
    Abstract: The object of the present invention is to provide a method for producing glycolide, with which a production rate of glycolide can be further enhanced. The method for producing glycolide that achieves the object described above includes: an oligomer preparation step of heating an aqueous glycolic acid solution and subjecting glycolic acid contained in the aqueous glycolic acid solution to dehydrating polycondensation, to obtain a glycolic acid oligomer; and a depolymerization step of depolymerizing the glycolic acid oligomer in the presence of ferrous ions to obtain glycolide.
    Type: Grant
    Filed: February 14, 2019
    Date of Patent: September 12, 2023
    Assignee: Kureha Corporation
    Inventors: Takenori Tose, Yoshinori Suzuki, Yuta Yamadoi
  • Glycolide production method
    Patent number: 11001565
    Abstract: The object of the present invention is to provide a glycolide production method capable of further increasing the production rate of glycolide. The glycolide production method according to the present invention includes adding metal iron to an aqueous glycolic acid solution, subjecting glycolic acid contained in the aqueous glycolic acid solution to which the metal iron is added, to dehydrating polycondensation to obtain a glycolic acid oligomer, and heating and depolymerizing the glycolic acid oligomer to obtain glycolide.
    Type: Grant
    Filed: February 20, 2019
    Date of Patent: May 11, 2021
    Assignee: KUREHA CORPORATION
    Inventors: Yuta Yamadoi, Yoshinori Suzuki, Takenori Tose, Haruyasu Yamaji, Toshihiko Ono
  • GLYCOLIDE PRODUCTION METHOD
    Publication number: 20210087162
    Abstract: The object of the present invention is to provide a glycolide production method capable of sufficiently increasing the production rate of glycolide. The glycolide production method according to the present invention includes: adding metal titanium to an aqueous glycolic acid solution; subjecting glycolic acid contained in the aqueous glycolic acid solution to which the metal titanium is added, to dehydrating polycondensation to obtain a glycolic acid oligomer; and heating and depolymerizing the glycolic acid oligomer to obtain glycolide.
    Type: Application
    Filed: March 6, 2019
    Publication date: March 25, 2021
    Applicant: Kureha Corporation
    Inventors: Haruyasu YAMAJI, Yuta YAMADOI, Yoshinori SUZUKI, Toshihiko ONO
  • METHOD FOR PRODUCING GLYCOLIDE
    Publication number: 20210017146
    Abstract: The object of the present invention is to provide a method for producing glycolide, with which a production rate of glycolide can be further enhanced. The method for producing glycolide that achieves the object described above includes: an oligomer preparation step of heating an aqueous glycolic acid solution and subjecting glycolic acid contained in the aqueous glycolic acid solution to dehydrating polycondensation, to obtain a glycolic acid oligomer; and a depolymerization step of depolymerizing the glycolic acid oligomer in the presence of ferrous ions to obtain glycolide.
    Type: Application
    Filed: February 14, 2019
    Publication date: January 21, 2021
    Applicant: Kureha Corporation
    Inventors: Takenori TOSE, Yoshinori SUZUKI, Yuta YAMADOI
  • GLYCOLIDE PRODUCTION METHOD
    Publication number: 20210002248
    Abstract: The object of the present invention is to provide a glycolide production method capable of further increasing the production rate of glycolide. The glycolide production method according to the present invention includes adding metal iron to an aqueous glycolic acid solution, subjecting glycolic acid contained in the aqueous glycolic acid solution to which the metal iron is added, to dehydrating polycondensation to obtain a glycolic acid oligomer, and heating and depolymerizing the glycolic acid oligomer to obtain glycolide.
    Type: Application
    Filed: February 20, 2019
    Publication date: January 7, 2021
    Applicant: Kureha Corporation
    Inventors: Yuta YAMADOI, Yoshinori SUZUKI, Takenori TOSE, Haruyasu YAMAJI, Toshihiko ONO