Patents by Inventor Ryosuke SENBA

Ryosuke SENBA 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 low-molecular-weight polytetrafluoroethylene
    Patent number: 11780973
    Abstract: Provided is a method for producing low-molecular-weight polytetrafluoroethylene which is less likely to generate C6-C14 perfluorocarboxylic acids and salts thereof. The disclosure relates to a method for producing low-molecular-weight polytetrafluoroethylene having a melt viscosity at 380° C. of 1.0×102 to 7.0×105 Pa·s. The method includes (1) irradiating high-molecular-weight polytetrafluoroethylene with radiation in a substantially oxygen-free state and decomposing the high-molecular-weight polytetrafluoroethylene into a low-molecular-weight component and (2) deactivating, in a substantially oxygen-free state, at least part of main-chain radicals and end radicals generated by the irradiation and providing the low-molecular-weight polytetrafluoroethylene.
    Type: Grant
    Filed: July 12, 2019
    Date of Patent: October 10, 2023
    Assignees: OSAKA UNIVERSITY, DAIKIN INDUSTRIES, LTD.
    Inventors: Akihiro Oshima, Takayuki Tanaka, Hideki Nakaya, Kazuyuki Satoh, Ryosuke Senba
  • METHOD FOR PRODUCING LOW-MOLECULAR-WEIGHT POLYTETRAFLUOROETHYLENE
    Publication number: 20210347953
    Abstract: Provided is a method for producing low-molecular-weight polytetrafluoroethylene which is less likely to generate C6-C14 perfluorocarboxylic acids and salts thereof. The disclosure relates to a method for producing low-molecular-weight polytetrafluoroethylene having a melt viscosity at 380° C. of 1.0×102 to 7.0×105 Pa·s. The method includes (1) irradiating high-molecular-weight polytetrafluoroethylene with radiation in a substantially oxygen-free state and decomposing the high-molecular-weight polytetrafluoroethylene into a low-molecular-weight component and (2) deactivating, in a substantially oxygen-free state, at least part of main-chain radicals and end radicals generated by the irradiation and providing the low-molecular-weight polytetrafluoroethylene.
    Type: Application
    Filed: July 12, 2019
    Publication date: November 11, 2021
    Applicants: OSAKA UNIVERSITY, DAIKIN INDUSTRIES, LTD.
    Inventors: Akihiro OSHIMA, Takayuki TANAKA, Hideki NAKAYA, Kazuyuki SATOH, Ryosuke SENBA