Patents by Inventor Masamichi Sukegawa

Masamichi Sukegawa 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: 20210221992
    Abstract: A polytetrafluoroethylene having a breaking strength of 10.0 N or more and a thermal instability index (TII) of 20 or more. Also disclosed is a stretched body including the polytetrafluoroethylene.
    Type: Application
    Filed: July 23, 2019
    Publication date: July 22, 2021
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Taketo KATO, Yohei FUJIMOTO, Kenji ICHIKAWA, Hiroyuki SATO, Ryota USAMI, Yoshinori NANBA, Hirotoshi YOSHIDA, Kengo ITO, Chiaki OKUI, Masamichi SUKEGAWA, Taku YAMANAKA, Yosuke KISHIKAWA, Hirokazu AOYAMA, Satoru YONEDA, Sumi ISHIHARA, Masahiro HIGASHI, Akiyoshi YAMAUCHI, Shinnosuke NITTA, Marina NAKANO
  • Publication number: 20210115224
    Abstract: A method for producing a fluoropolymer which includes polymerizing a fluoromonomer in an aqueous medium in the presence of a surfactant to provide a fluoropolymer. The surfactant includes at least one selected from the group consisting of a surfactant represented by R1a—CO—R2 a—CO—R3a—OSO3Xa and a surfactant represented by R1b—CO—(CR2b2)n—(OR3b)p—(CR4b2)q-L-OSO3Xb.
    Type: Application
    Filed: March 30, 2018
    Publication date: April 22, 2021
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Taketo KATO, Satoru YONEDA, Manabu FUJISAWA, Kazuya ASANO, Takahiro KITAHARA, Masahiro HIGASHI, Akiyoshi YAMAUCHI, Sumi ISHIHARA, Yosuke KISHIKAWA, Shinnosuke NITTA, Marina NAKANO, Hirotoshi YOSHIDA, Yoshinori NAN BA, Kengo ITO, Chiaki OKUI, Hirokazu AOYAMA, Masamichi SUKEGAWA, Taku YAMANAKA, Hiroyuki SATO, Yuuji TANAKA, Kenji ICHIKAWA, Yohei FUJIMOTO
  • Publication number: 20210108008
    Abstract: A method for producing a fluoropolymer of the invention which includes polymerizing a fluoromonomer in an aqueous medium in the presence of a surfactant to provide a fluoropolymer. The surfactant includes at least one selected from the group consisting of a surfactant represented by R1a—CO—R2a—CO—R3a-Aa and a surfactant represented by R1b—CO—(CR2b2)n—(OR3b)p—(CR4b2)q-L-Ab.
    Type: Application
    Filed: March 30, 2018
    Publication date: April 15, 2021
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Taketo KATO, Satoru YONEDA, Manabu FUJISAWA, Kazuya ASANO, Takahiro KITAHARA, Masahiro HIGASHI, Akiyoshi YAMAUCHI, Sumi ISHIHARA, Yosuke KISHIKAWA, Shinnosuke NITTA, Marina NAKANO, Hirotoshi YOSHIDA, Yoshinori NANBA, Kengo ITO, Chiaki OKUI, Hirokazu AOYAMA, Masamichi SUKEGAWA, Taku YAMANAKA, Yuuji TANAKA, Kenji ICHIKAWA, Yohei FUJIMOTO, Hiroyuki SATO
  • Publication number: 20210095054
    Abstract: A method for producing a fluoropolymer, which includes polymerizing a fluoromonomer in an aqueous medium in the presence of a surfactant to provide a fluoropolymer, wherein the surfactant is a carboxylic acid type hydrocarbon-containing surfactant.
    Type: Application
    Filed: March 7, 2019
    Publication date: April 1, 2021
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Hirotoshi YOSHIDA, Taketo KATO, Kenji ICHIKAWA, Yohei FUJIMOTO, Yoshinori NANBA, Kengo ITO, Masahiro HIGASHI, Satoru YONEDA, Akiyoshi YAMAUCHI, Sumi ISHIHARA, Moe HOSOKAWA, Marina NAKANO, Yuuji TANAKA, Yosuke KISHIKAWA, Hirokazu AOYAMA, Masamichi SUKEGAWA, Taku YAMANAKA, Hiroyuki SATO
  • Publication number: 20210070974
    Abstract: A core-shell particle including a core containing a perfluoropolymer and a shell containing a non-fluorine resin, the core having a periphery coated with the non-fluorine resin at a coverage of 90% or more, the perfluoropolymer being a polymer containing a polymerized unit based on a perfluoro monomer in an amount of 90 mol % or more relative to all polymerized units, and the shell having a mass of 50 or less relative to a total mass of the core and the shell of 80. Also disclosed is a method for producing the core-shell particle.
    Type: Application
    Filed: December 13, 2018
    Publication date: March 11, 2021
    Applicants: DAIKIN INDUSTRIES, LTD., NISSIN CHEMICAL INDUSTRY CO., LTD.
    Inventors: Katsuhide OHTANI, Masamichi SUKEGAWA, Kazuhiro YAMAMURA, Shoichi ARIMA, Takeshi FUKUZUMI, Yuji GAMA
  • Publication number: 20210040274
    Abstract: Powder including low molecular weight polytetrafluoroethylene having a melt viscosity of 1×102 to 7×105 Pa·s at 380° C., having a melt viscosity of 1×102 to 7×105 Pa·s at 380° C., having an average particle size of 1.0 to 50 ?m, and containing 30 or more carboxyl groups at ends of the molecule chain per 106 carbon atoms in the main chain, wherein the powder is substantially free from C8-C14 perfluorocarboxylic acids and salts thereof.
    Type: Application
    Filed: October 23, 2020
    Publication date: February 11, 2021
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Ken YOSHIDA, Hirotoshi YOSHIDA, Keisuke HAGI, Masayuki TSUJI, Taketo KATO, Yuuji TANAKA, Taku YAMANAKA, Kazuya KAWAHARA, Masamichi SUKEGAWA, Kazutaka HOSOKAWA
  • Publication number: 20210032381
    Abstract: A method for producing a fluoropolymer which includes polymerizing a fluoromonomer in an aqueous medium in the presence of a surfactant to provide a fluoropolymer, the surfactant being represented by the general formula (1): CR1R2R4—CR3R5—X-A, wherein R1 to R5 are each H or a monovalent substituent, with the proviso that at least one of R1 and R3 represents a group represented by the general formula: —Y—R6 and at least one of R2 and R5 represents a group represented by the general formula: —X-A or a group represented by the general formula: —Y—R6; and A is the same or different at each occurrence and is —COOM, —SO3M, or —OSO3M. Also disclosed is a surfactant for polymerization represented by the general formula (1), a method for producing a fluoropolymer using the surfactant and a composition including a fluoropolymer and the surfactant.
    Type: Application
    Filed: February 7, 2019
    Publication date: February 4, 2021
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Taketo KATO, Satoru YONEDA, Masahiro HIGASHI, Akiyoshi YAMAUCHI, Sumi ISHIHARA, Yosuke KISHIKAWA, Moe HOSOKAWA, Marina NAKANO, Hirotoshi YOSHIDA, Yoshinori NANBA, Kengo ITO, Chiaki OKUI, Kenji ICHIKAWA, Yohei FUJIMOTO, Hirokazu AOYAMA, Masamichi SUKEGAWA, Taku YAMANAKA, Hiroyuki SATO
  • Publication number: 20210032472
    Abstract: A main object of the present invention is to provide a novel acetylpolyamine detection agent that is easy to produce and use. This object is achieved by an acetylpolyamine detection agent comprising compound (A) having one or more polyether rings, wherein the polyether rings have one or more hydroxyl groups as substituents.
    Type: Application
    Filed: January 31, 2019
    Publication date: February 4, 2021
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Tomohito HAMADA, Yosuke KISHIKAWA, Masamichi SUKEGAWA
  • Patent number: 10870735
    Abstract: The invention provides a production method for producing low molecular weight polytetrafluoroethylene enabling easy removal of most of C8-C14 perfluorocarboxylic acids and salts thereof, which are unfortunately generated by irradiation, from the low molecular weight polytetrafluoroethylene. The method for producing low molecular weight polytetrafluoroethylene includes: (1) irradiating polytetrafluoroethylene to provide low molecular weight polytetrafluoroethylene having a melt viscosity of 1×102 to 7×105 Pa·s at 380° C.; (2) pulverizing the low molecular weight polytetrafluoroethylene; and (3) heating the low molecular weight polytetrafluoroethylene pulverized in the step (2).
    Type: Grant
    Filed: August 4, 2017
    Date of Patent: December 22, 2020
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Ken Yoshida, Hirotoshi Yoshida, Keisuke Hagi, Masayuki Tsuji, Taketo Kato, Yuuji Tanaka, Taku Yamanaka, Kazuya Kawahara, Masamichi Sukegawa, Kazutaka Hosokawa
  • Publication number: 20200392266
    Abstract: A method for producing a fluoropolymer, which includes polymerizing a fluoromonomer in an aqueous medium in the presence of a polymer (1), the polymer (1) including a polymerized unit derived from a monomer CX2?CY(—CZ2—O—Rf-A), wherein X is the same or different and is —H or —F; Y is —H, —F, an alkyl group, or a fluorine-containing alkyl group; Z is the same or different and is —H, —F, an alkyl group, or a fluoroalkyl group; Rf is a C1-C40 fluorine-containing alkylene group or a C—C100 fluorine-containing alkylene group and having an ether bond; and A is —COOM, —SO3M, or —OSO3M, wherein M is —H, a metal atom, —NR74, imidazolium optionally having a substituent, pyridinium optionally having a substituent, or phosphonium optionally having a substituent, wherein R7 is H or an organic group, providing that at least one of X, Y, and Z contains a fluorine atom.
    Type: Application
    Filed: March 1, 2019
    Publication date: December 17, 2020
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Yoshinori NANBA, Kenji ICHIKAWA, Yohei FUJIMOTO, Hirotoshi YOSHIDA, Hiroyuki SATO, Taketo KATO, Kengo ITO, Sumi ISHIHARA, Masahiro HIGASHI, Satoru YONEDA, Hirokazu AOYAMA, Masamichi SUKEGAWA, Yosuke KISHIKAWA, Takahiro TAIRA, Chiaki OKUI, Taku YAMANAKA
  • Patent number: 10793650
    Abstract: Low molecular weight polytetrafluoroethylene powder having a complex viscosity of 1×102 to 7×105 Pa·s at 380° C., containing 5 or less carboxyl groups at ends of the molecule chain per 106 carbon atoms in the main chain, and being substantially free from C8-C14 perfluorocarboxylic acids and salts thereof. Also disclosed is a method for producing low molecular weight polytetrafluoroethylene.
    Type: Grant
    Filed: November 26, 2019
    Date of Patent: October 6, 2020
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Ken Yoshida, Hirotoshi Yoshida, Keisuke Hagi, Masayuki Tsuji, Taketo Kato, Yuuji Tanaka, Taku Yamanaka, Kazuya Kawahara, Masamichi Sukegawa, Kazutaka Hosokawa
  • Patent number: 10731015
    Abstract: The present invention aims to provide a modified fluorine-containing copolymer excellent in crack resistance, a fluororesin molded article, and a method of producing a fluororesin molded article. The present invention includes a modified fluorine-containing copolymer consisting only of tetrafluoroethylene units and perfluoro(alkyl vinyl ether) units. The copolymer is modified by irradiation with radiation at an irradiation temperature not higher than the melting point of the copolymer but not lower than 200° C.
    Type: Grant
    Filed: July 4, 2013
    Date of Patent: August 4, 2020
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Kyouhei Sawaki, Hideki Kono, Hitoshi Imamura, Takahisa Aoyama, Masamichi Sukegawa
  • Publication number: 20200123283
    Abstract: Low molecular weight polytetrafluoroethylene powder having a complex viscosity of 1×102 to 7×103 Pa·s at 380° C., containing 5 or less carboxyl groups at ends of the molecule chain per 106 carbon atoms in the main chain, and being substantially free from C8-C14 perfluorocarboxylic acids and salts thereof. Also disclosed is a method for producing low molecular weight polytetrafluoroethylene.
    Type: Application
    Filed: November 26, 2019
    Publication date: April 23, 2020
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Ken YOSHIDA, Hirotoshi Yoshida, Keisuke Hagi, Masayuki Tsuji, Taketo Kato, Yuuji Tanaka, Taku Yamanaka, Kazuya Kawahara, Masamichi Sukegawa, Kazutaka Hosokawa
  • Patent number: 10538605
    Abstract: A method for producing low molecular weight polytetrafluoroethylene less likely to generate C8-C14 perfluorocarboxylic acids and salts thereof. The method includes: (1) feeding into an airtight container: polytetrafluoroethylene; at least one additive selected from the group consisting of hydrocarbons, chlorinated hydrocarbons, alcohols, and carboxylic acids other than C8-C14 perfluorocarboxylic acids; and at least one selected from the group consisting of inert gases other than the above additive and oxygen adsorbents; and (2) irradiating the polytetrafluoroethylene to provide low molecular weight polytetrafluoroethylene having a complex viscosity of 1×102 to 7×105 Pa·s at 380° C.
    Type: Grant
    Filed: August 4, 2017
    Date of Patent: January 21, 2020
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Ken Yoshida, Hirotoshi Yoshida, Keisuke Hagi, Masayuki Tsuji, Taketo Kato, Yuuji Tanaka, Taku Yamanaka, Kazuya Kawahara, Masamichi Sukegawa, Kazutaka Hosokawa
  • Publication number: 20190023856
    Abstract: The invention provides a production method for producing low molecular weight polytetrafluoroethylene enabling easy removal of most of C8-C14 perfluorocarboxylic acids and salts thereof, which are unfortunately generated by irradiation, from the low molecular weight polytetrafluoroethylene. The method for producing low molecular weight polytetrafluoroethylene includes: (1) irradiating polytetrafluoroethylene to provide low molecular weight polytetrafluoroethylene having a melt viscosity of 1×102 to 7×105 Pa·s at 380° C.; (2) pulverizing the low molecular weight polytetrafluoroethylene; and (3) heating the low molecular weight polytetrafluoroethylene pulverized in the step (2).
    Type: Application
    Filed: August 4, 2017
    Publication date: January 24, 2019
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Ken YOSHIDA, Hirotoshi YOSHIDA, Keisuke HAGI, Masayuki TSUJI, Taketo KATO, Yuuji TANAKA, Taku YAMANAKA, Kazuya KAWAHARA, Masamichi SUKEGAWA, Kazutaka HOSOKAWA
  • Publication number: 20190023818
    Abstract: The invention provides a method for producing low molecular weight polytetrafluoroethylene less likely to generate C8-C14 perfluorocarboxylic acids and salts thereof. The method for producing low molecular weight polytetrafluoroethylene includes: (1) feeding into an airtight container: polytetrafluoroethylene; at least one additive selected from the group consisting of hydrocarbons, chlorinated hydrocarbons, alcohols, and carboxylic acids other than C8-C14 perfluorocarboxylic acids; and at least one selected from the group consisting of inert gases other than the above additive and oxygen adsorbents; and (2) irradiating the polytetrafluoroethylene to provide low molecular weight polytetrafluoroethylene having a complex viscosity of 1×102 to 7×105 Pa·s at 380° C.
    Type: Application
    Filed: August 4, 2017
    Publication date: January 24, 2019
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Ken YOSHIDA, Hirotoshi YOSHIDA, Keisuke HAGI, Masayuki TSUJI, Taketo KATO, Yuuji TANAKA, Taku YAMANAKA, Kazuya KAWAHARA, Masamichi SUKEGAWA, Kazutaka HOSOKAWA
  • Publication number: 20150200402
    Abstract: The present invention aims to provide a sheet having high conductivity in the thickness direction and excellent breathability, water repellency, corrosion resistance, and flexibility so as to be suitably used for an electrode of fuel cells and the like. The present invention also aims to provide an electrode and a fuel cell. The present invention provides a sheet containing polytetrafluoroethylene, carbon black, and graphite, the polytetrafluoroethylene having a standard specific gravity of 2.14 to 2.28, a total amount of the carbon black and the graphite being more than 35% by mass of a total amount of the polytetrafluoroethylene, the carbon black, and the graphite.
    Type: Application
    Filed: July 8, 2013
    Publication date: July 16, 2015
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Hiroyuki Yoshimoto, Shinichi Chaen, Kazuya Kawahara, Yoshiyuki Shibuya, Masamichi Sukegawa
  • Publication number: 20150158988
    Abstract: The present invention aims to provide a modified fluorine-containing copolymer excellent in crack resistance, a fluororesin molded article, and a method of producing a fluororesin molded article. The present invention includes a modified fluorine-containing copolymer consisting only of tetrafluoroethylene units and perfluoro(alkyl vinyl ether) units. The copolymer is modified by irradiation with radiation at an irradiation temperature not higher than the melting point of the copolymer but not lower than 200° C.
    Type: Application
    Filed: July 4, 2013
    Publication date: June 11, 2015
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Kyouhei Sawaki, Hideki Kono, Hitoshi Imamura, Takahisa Aoyama, Masamichi Sukegawa
  • Publication number: 20140227533
    Abstract: The present invention aims to provide a laminate in which a metal and a fluoropolymer are directly and firmly attached to each other. The present invention relates to a laminate including a layer (A) including a metal, and a layer (B) formed on the layer (A), wherein the layer (B) includes a copolymer containing a polymer unit based on tetrafluoroethylene and a polymer unit based on a perfluoro(alkyl vinyl ether), the copolymer contains a carboxyl group at a terminus of a main chain and has a melt flow rate of not lower than 20 g/10 min and a melting point of not higher than 295° C., and the metal is at least one selected from the group consisting of copper, stainless steel, aluminum, iron, and an alloy thereof.
    Type: Application
    Filed: September 21, 2012
    Publication date: August 14, 2014
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Shinya Murakami, Hiroyuki Yoshimoto, Takeshi Inaba, Masamichi Sukegawa, Yasuyuki Yamaguchi
  • Patent number: 8466236
    Abstract: The invention provides a fluororesin composition capable of providing a molded article having low relative dielectric constant, excellent in a temperature stability and causing only small transmission losses. The invention is a fluororesin composition wherein a rate of change in relative dielectric constant between 25° C. and 80° C. of a molded article produced therefrom under a standard condition is not greater than 0.2%.
    Type: Grant
    Filed: February 18, 2008
    Date of Patent: June 18, 2013
    Assignee: Daikin Industries, Ltd.
    Inventors: Hiroyuki Yoshimoto, Hirokazu Yukawa, Yasuhiko Sawada, Taku Yamanaka, Masamichi Sukegawa