Patents by Inventor Hideki Nakaya

Hideki Nakaya 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).

  • Publication number: 20210070679
    Abstract: A process for producing one or both of tetrafluoroethylene and hexafluoropropylene, which includes pyrolyzing a low molecular weight fluorine compound by continuous reaction in a microreactor.
    Type: Application
    Filed: November 16, 2020
    Publication date: March 11, 2021
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Toshihiko OHTA, Hideki Nakaya, Mai Hirai, Takashi Yasuhara, Atsushi Noguchi
  • Publication number: 20200208765
    Abstract: A pipe-joining centering device aligns, with an axial center of one pipe, an axial center of another pipe when a spigot of the other pipe is to be inserted into a socket of the one pipe. The pipe-joining centering device includes a support member configured to support an end part of the spigot. The support member is tiltable in a pipe radial direction between an inner peripheral surface of the socket and an outer peripheral surface of the spigot. The pipe-joining centering device also includes a position adjustment member configured to tilt the support member in the pipe radial direction. The support member and the position adjustment member are supported on the inner peripheral surface of the socket.
    Type: Application
    Filed: December 20, 2019
    Publication date: July 2, 2020
    Applicant: KUBOTA CORPORATION
    Inventors: Shozo KISHI, Keita ODA, Ryunosuke TANAKA, Hideki NAKAYA
  • Patent number: 10029981
    Abstract: The present invention provides a process for producing a perfluoropolyoxyalkylene peroxide compound comprising a step of reacting a perfluoroalkene with oxygen, wherein the reaction of the perfluoroalkene with oxygen is performed in a microreactor.
    Type: Grant
    Filed: December 8, 2016
    Date of Patent: July 24, 2018
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Keiichirou Watanabe, Hideki Nakaya, Motohisa Shino, Tatsuya Takakuwa, Kazunori Morimoto
  • Patent number: 9944595
    Abstract: The present invention provides a process for producing a perfluoropolyoxyalkylene peroxide compound comprising a step of reacting a perfluoroalkene with oxygen, wherein the reaction of the perfluoroalkene with oxygen is performed under ultraviolet irradiation and in the presence of a fluorine source.
    Type: Grant
    Filed: December 8, 2016
    Date of Patent: April 17, 2018
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Keiichirou Watanabe, Hideki Nakaya, Motohisa Shino, Tatsuya Takakuwa, Kazunori Morimoto
  • Publication number: 20170166521
    Abstract: The present invention provides a process for producing a perfluoropolyoxyalkylene peroxide compound comprising a step of reacting a perfluoroalkene with oxygen, wherein the reaction of the perfluoroalkene with oxygen is performed under ultraviolet irradiation and in the presence of a fluorine source.
    Type: Application
    Filed: December 8, 2016
    Publication date: June 15, 2017
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Keiichirou WATANABE, Hideki NAKAYA, Motohisa SHINO, Tatsuya TAKAKUWA, Kazunori MORIMOTO
  • Publication number: 20170166522
    Abstract: The present invention provides a process for producing a perfluoropolyoxyalkylene peroxide compound comprising a step of reacting a perfluoroalkene with oxygen, wherein the reaction of the perfluoroalkene with oxygen is performed in a microreactor.
    Type: Application
    Filed: December 8, 2016
    Publication date: June 15, 2017
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Keiichirou WATANABE, Hideki NAKAYA, Motohisa SHINO, Tatsuya TAKAKUWA, Kazunori MORIMOTO
  • Patent number: 9169225
    Abstract: The present invention provides a novel method for producing hexafluoropropylene oxide, which can attain a high HFPO selectivity without using a phase transfer catalyst. Hexafluoropropylene (HFP), a water-soluble and aprotic organic solvent, and an aqueous solution of an oxidizing agent are introduced into a small space, thereby bringing into contact with each other and reacting hexafluoropropylene with the oxidizing agent to obtain hexafluoropropylene oxide (HFPO).
    Type: Grant
    Filed: March 9, 2010
    Date of Patent: October 27, 2015
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Kazuyoshi Ichihara, Hideki Nakaya, Mai Hirai, Yasuhide Senba
  • Patent number: 8877017
    Abstract: The present invention provides a novel method for separating hexafluoropropylene oxide (HFPO) from hexafluoropropylene (HFP), which is capable of reducing the burden on the environment. A mixture including HFPO and HFP is subjected to an extractive distillation operation using, as a solvent, at least one of a fluorine-containing saturated compound represented by the general formula CnHaFb (wherein n, a and b are integers which satisfy: n=3 to 8, 0?a?2n+1, and 1?b?2n+2) thereby separating into a first fraction including HFPO and a second fraction including HFP and the solvent. At least one of 1-bromopropane and 2-bromopropane may be u as the solvent in place of the fluorine-containing saturated compound.
    Type: Grant
    Filed: February 18, 2010
    Date of Patent: November 4, 2014
    Assignee: Daikin Industries, Ltd.
    Inventors: Hideki Nakaya, Kazuyoshi Ichihara, Yasuhide Senba, Mikio Nakagoshi, Kazunori Morimoto
  • Publication number: 20120016142
    Abstract: The present invention provides a novel method for producing hexafluoropropylene oxide, which can attain a high HFPO selectivity without using a phase transfer catalyst. Hexafluoropropylene (HFP), a water-soluble and aprotic organic solvent, and an aqueous solution of an oxidizing agent are introduced into a small space, thereby bringing into contact with each other and reacting hexafluoropropylene with the oxidizing agent to obtain hexafluoropropylene oxide (HFPO).
    Type: Application
    Filed: March 9, 2010
    Publication date: January 19, 2012
    Inventors: Kazuyoshi Ichihara, Hideki Nakaya, Mai Hirai, Yasuhide Senba
  • Publication number: 20120006672
    Abstract: The present invention provides a novel method for separating hexafluoropropylene oxide (HFPO) from hexafluoropropylene (HFP), which is capable of reducing the burden on the environment. A mixture including HFPO and HFP is subjected to an extractive distillation operation using, as a solvent, at least one of a fluorine-containing saturated compound represented by the general formula CnHaFb (wherein n, a and b are integers which satisfy: n=3 to 8, 0?a?2n+1, and 1?b?2n+2) thereby separating into a first fraction including HFPO and a second fraction including HFP and the solvent. At least one of 1-bromopropane and 2-bromopropane may be u as the solvent in place of the fluorine-containing saturated compound.
    Type: Application
    Filed: February 18, 2010
    Publication date: January 12, 2012
    Inventors: Hideki Nakaya, Kazuyoshi Ichihara, Yasuhide Senba, Mikio Nakagoshi, Kazunori Morimoto
  • Publication number: 20100016615
    Abstract: There is provided a process for producing hexafluoropropylene oxide which is novel and capable of achieving a higher yield. An organic phase comprising hexafluoropropylene (HFP) in an organic solvent and an aqueous phase comprising an oxygen-containing oxidizing agent in water are supplied to a small space (or microspace), preferably together with a phase transfer catalyst. The organic phase and the aqueous phase are contacted with each other in the small space, thereby reacting hexafluoropropylene (HFP) with the oxygen-containing oxidizing agent, preferably by an action of the phase transfer catalyst to give hexafluoropropylene oxide (HFPO). After the reaction, the organic phase and the aqueous phase are taken out from the small space to obtain an organic phase comprising the hexafluoropropylene oxide (HFPO).
    Type: Application
    Filed: October 23, 2007
    Publication date: January 21, 2010
    Inventors: Hideki Nakaya, Michio Asano, Hideya Saitou
  • Patent number: 7498402
    Abstract: A method of purifying a treatment target substance containing a fluorine-containing surfactant which includes removing at least part of the fluorine-containing surfactant from the treatment target substance by contacting the treatment target substance with a gas containing carbon dioxide. The fluorine-containing surfactant is an ether oxygen-free anionic compound represented by one of general formulae (1) and (2) as defined herein.
    Type: Grant
    Filed: July 5, 2004
    Date of Patent: March 3, 2009
    Assignee: Daikin Industries, Ltd.
    Inventors: Hideki Nakaya, Tadahiro Yabu, Mitsuo Tsukamoto, Kenji Otoi, Yoshiyuki Hiraga, Yuji Imahori
  • Patent number: 7173098
    Abstract: The present invention has for its object to provide a method of producing fluoropolymers with high productivity under comparatively low temperature and low pressure conditions which are conducive to reduced cost of commercial-scale production equipment. The present invention is directed to a method of producing a fluoropolymer which comprises polymerizing a radical polymerizable monomer in a defined reaction-field, said radical polymerizable monomer comprising a fluorine-containing ethylenic monomer and said defined reaction-field being in supercriticality-expression state with a monomer density [?m]-monomer critical density [?0] ratio of [?m/?0] not less than 1.1.
    Type: Grant
    Filed: November 1, 2002
    Date of Patent: February 6, 2007
    Assignee: Daikin Industries, Ltd.
    Inventors: Mitsuo Tsukamoto, Kenji Otoi, Hideki Nakaya, Yoshiyuki Hiraga, Tomohisa Noda
  • Publication number: 20060151391
    Abstract: The present invention provides a method of removing fluorine-containing surfactants from treatment target substances containing fluorine-containing surfactants and a method of producing aggregates comprising polymer from aqueous dispersions thereof. The present invention is a method of purifying a treatment target substance comprising carrying out a removing treatment of a fluorine-containing surfactant by bringing the treatment target substance containing the fluorine-containing surfactant into contact with a substance [A], wherein the substance [A] is a gas under standard conditions (105 Pa, 0° C.).
    Type: Application
    Filed: July 5, 2004
    Publication date: July 13, 2006
    Inventors: Hideki Nakaya, Tadahiro Yabu, Mitsuo Tsukamoto, Kenji Otoi, Yoshiyuki Hiraga, Yuji Imahori
  • Publication number: 20060122347
    Abstract: A fluoropolymer producing method which comprises polymerizing a radical polymerizable monomer in a manner of continuous polymerization to give the fluoropolymer, wherein the defined reaction-field is in a supercriticality-expression state and under a pressure of not higher than 40 MPa and a temperature of not higher than that higher by 100° C. than the supercriticality-expression temperature of the defined reaction-field, said radical polymerizable monomer comprises a fluorine-containing ethylenic monomer, and said fluoropolymer has a weight average molecular weight [Mw] of not lower than 150, 000 as determined on the polystyrene equivalent basis and a ratio [Mw/Mn] of the weight average molecular weight [Mw] on the polystyrene equivalent basis to a number average molecular weight [Mn] of the fluoropolymer on the polystyrene equivalent basis is higher than 1 but not higher than 3.
    Type: Application
    Filed: August 28, 2003
    Publication date: June 8, 2006
    Inventors: Mitsuo Tsukamoto, Kenji Otoi, Yoshiyuki Hiraga, Hideki Nakaya, Toshiki Ichisaka
  • Publication number: 20050043498
    Abstract: The present invention has for its object to provide a method of producing fluoropolymers with high productivity under comparatively low temperature and low pressure conditions which are conducive to reduced cost of commercial-scale production equipment. The present invention is directed to a method of producing a fluoropolymer which comprises polymerizing a radical polymerizable monomer in a defined reaction-field, said radical polymerizable monomer comprising a fluorine-containing ethylenic monomer and said defined reaction-field being in supercriticality-expression state with a monomer density [?m]?monomer critical density [?0] ratio of [?m/?0] not less than 1.1.
    Type: Application
    Filed: November 1, 2002
    Publication date: February 24, 2005
    Inventors: Mitsuo Tsukamoto, Kenji Otoi, Hideki Nakaya, Yoshiyuki Hiraga, Tomohisa Noda