Patents by Inventor Taku Yamanaka

Taku Yamanaka 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: 20240026141
    Abstract: A fluororesin composition, and a molded article obtained from the fluororesin composition. The fluororesin composition containing: a non-melt-flowable fluororesin A having a history of being heated to a melting point thereof or higher; and a non-melt-flowable fluororesin B having no history of being heated to a melting point thereof or higher. The fluororesin composition contains a tetrafluoroethylene unit and a modifying monomer unit based on a modifying monomer copolymerizable with tetrafluoroethylene. Further, the fluororesin composition is a powder for compression molding excluding ram extrusion molding.
    Type: Application
    Filed: September 29, 2023
    Publication date: January 25, 2024
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Hirofumi MUKAE, Yosuke KISHIKAWA, Taku YAMANAKA, Taketo KATO, Ryuo ITOH, Hiroki KUBOTA
  • Publication number: 20240026043
    Abstract: A method for producing a fluororesin composition for compression molding excluding ram extrusion molding, the method including: mixing a powder of a fluororesin A1 having a history of being heated to a melting point thereof or higher and an aqueous dispersion containing particles of a fluororesin B1 and having a solid concentration of 50% by mass or lower to provide a mixture; and drying the mixture to provide a fluororesin composition.
    Type: Application
    Filed: September 29, 2023
    Publication date: January 25, 2024
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Hirofumi Mukae, Yosuke Kishikawa, Taku Yamanaka, Taketo Kato, Ryuo Itoh, Hiroki Kubota
  • Publication number: 20240026142
    Abstract: A fluororesin composition and a molded article obtained from the fluororesin composition, the fluororesin composition containing: a non-melt-flowable fluororesin A having a history of being heated to a melting point thereof or higher; and a non-melt-flowable fluororesin B having no history of being heated to a melting point thereof or higher and being prepared by suspension polymerization. Further, the fluororesin composition has an apparent density of 0.42 g/ml or higher and 1.00 g/ml or lower, and is a powder for compression molding excluding ram extrusion molding.
    Type: Application
    Filed: September 29, 2023
    Publication date: January 25, 2024
    Applicant: DAIKIN INDUSTRIES, LTD
    Inventors: Hirofumi MUKAE, Yosuke KISHIKAWA, Taku YAMANAKA, Taketo KATO, Ryuo ITOH, Hiroki KUBOTA
  • Publication number: 20240018349
    Abstract: A fluororesin composition, and a molded article obtained from the fluororesin composition. The fluororesin composition containing: a non-melt-flowable fluororesin A having a history of being heated to a melting point thereof or higher; and a non-melt-flowable fluororesin B having no history of being heated to a melting point thereof or higher and being prepared by suspension polymerization. Further, the fluororesin composition has an apparent density of 0.42 g/ml or higher and 1.00 g/ml or lower, and is in the form of powder.
    Type: Application
    Filed: September 29, 2023
    Publication date: January 18, 2024
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Hirofumi MUKAE, Yosuke KISHIKAWA, Taku YAMANAKA, Taketo KATO, Ryuo ITOH, Hiroki KUBOTA
  • Publication number: 20240018280
    Abstract: A fluororesin composition having no melt flowability, and a molded article obtained from the fluororesin composition. The fluororesin composition contains: a non-melt-flowable fluororesin A having a history of being heated to a melting point thereof or higher; a melt-flowable fluororesin B; and a non-melt-flowable fluororesin C including a portion having no history of being heated to a melting point thereof or higher.
    Type: Application
    Filed: September 29, 2023
    Publication date: January 18, 2024
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Hirofumi MUKAE, Yosuke KISHIKAWA, Taku YAMANAKA, Taketo KATO, Atsushi SAKAKURA, Ryuo ITOH, Hiroki KUBOTA, Ayane NAKAUE
  • Publication number: 20240002558
    Abstract: The present disclosure provides a method for producing a fluororesin, which includes polymerizing a fluorine-containing monomer in the presence of a compound (1) having triple bond and a hydrophilic group and an aqueous medium to produce a fluororesin, a fluororesin comprising a unit based on a compound (1) having triple bond and a hydrophilic group, and a fluorine-containing monomer unit, and an aqueous dispersion comprising the fluororesin and an aqueous medium.
    Type: Application
    Filed: September 14, 2023
    Publication date: January 4, 2024
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Hiroyuki SATO, Kenji Ichikawa, Taketo Kato, Taku Yamanaka
  • Publication number: 20230416421
    Abstract: A method for producing a fluoropolymer aqueous dispersion, the method including concentrating a composition comprising a polymer (I) containing a polymerization unit (I) derived from a monomer (I) represented by the general formula (I), a fluoropolymer excluding the polymer (I), a nonionic surfactant, a fluorine-free anionic surfactant, and an aqueous medium to thereby obtain an aqueous dispersion containing the fluoropolymer, CX1X3?CX2R(—CZ1Z2-A0)m??(I) wherein X1 and X3 are each independently F, Cl, H, or CF3; X2 is H, F, an alkyl group, or a fluorine-containing alkyl group; A0 is an anionic group; R is a linking group; Z1 and Z2 are each independently H, F, an alkyl group, or a fluorine-containing alkyl group; and m is an integer of 1 or more.
    Type: Application
    Filed: September 11, 2023
    Publication date: December 28, 2023
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Takuya YOSHIOKA, Emi YAMAMOTO, Yohei FUJIMOTO, Taketo KATO, Taku YAMANAKA, Hirotoshi YOSHIDA
  • Patent number: 11851519
    Abstract: A method for producing an aqueous dispersion of purified polytetrafluoroethylene, the method including: removing or reducing a compound represented by Formula (1) or (2) below from an aqueous dispersion of polytetrafluoroethylene obtained using a hydrocarbon surfactant: (H—(CF2)m—COO)pM1; or??Formula (1): (H—(CF2)n—SO3)qM2.??Formula (2): Also disclosed is a composition containing polytetrafluoroethylene substantially free from a compound represented by Formula (3) below and a molded body including the composition: (H—(CF2)8—SO3)qM2.
    Type: Grant
    Filed: August 10, 2018
    Date of Patent: December 26, 2023
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Takahiro Taira, Kazuhiro Mishima, Chiaki Okui, Tadao Hayashi, Hirotoshi Yoshida, Yuuji Tanaka, Masayoshi Miyamoto, Taku Yamanaka, Taketo Kato
  • Patent number: 11814490
    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: Grant
    Filed: October 23, 2020
    Date of Patent: November 14, 2023
    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: 20230348637
    Abstract: A fluoropolymer composition production method for producing a fluoropolymer composition containing a fluoropolymer, the method which includes polymerizing a fluoromonomer in a reactor in the presence of a fluorine-containing surfactant, a polymerization initiator, and an aqueous medium to prepare an aqueous dispersion comprising a fluoropolymer; feeding an inert gas to the reactor; and subjecting to a heat treatment the aqueous dispersion in the reactor to give a fluoropolymer composition, wherein a temperature of the heat treatment is 35° C. or higher and a time of the heat treatment is 15 minutes or more.
    Type: Application
    Filed: July 10, 2023
    Publication date: November 2, 2023
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Ranna YAMAZAKI, Taketo KATO, Taku YAMANAKA, Hirotoshi YOSHIDA, Takuya YAMABE, Akiho OGURA
  • Publication number: 20230348636
    Abstract: Provided is a fluoropolymer composition production method for producing a fluoropolymer composition containing a fluoropolymer, the method which includes polymerizing a fluoromonomer in a reactor in the presence of a fluorine-containing surfactant, a polymerization initiator, and an aqueous medium to prepare an aqueous dispersion containing a fluoropolymer; after the aqueous dispersion is prepared, removing from the reactor the fluoromonomer remaining in the reactor, or recovering the aqueous dispersion in the reactor and accommodating the aqueous dispersion in a container different from the reactor; adding a radical generator to the aqueous dispersion; and subjecting to a heat treatment the aqueous dispersion comprising the radical generator to give a fluoropolymer composition.
    Type: Application
    Filed: July 10, 2023
    Publication date: November 2, 2023
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Ranna YAMAZAKI, Taketo KATO, Taku YAMANAKA, Hirotoshi YOSHIDA, Takuya YAMABE, Akiho OGURA
  • Publication number: 20230340169
    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: June 30, 2023
    Publication date: October 26, 2023
    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
  • Publication number: 20230303731
    Abstract: A method for producing a polytetrafluoroethylene, which includes polymerizing tetrafluoroethylene in an aqueous medium in the presence of a polymer (1) to obtain the polytetrafluoroethylene, wherein the polymer (1) is a polymer of a monomer (1) represented by the general formula (1): CF2?CF(—O—Rf-A), has a weight average molecular weight of 1.4×104 or more, wherein a content of a polymerization unit (1) based on the monomer (1) is 40 mol % or more based on all polymerization units constituting the polymer (1), and a content of a dimer and a trimer of the monomer (1) is 1.0% by mass or less based on the polymer (1).
    Type: Application
    Filed: May 17, 2023
    Publication date: September 28, 2023
    Applicant: DAIKIN INDUSTRIES, LTD
    Inventors: Yoshinori NANBA, Taketo KATO, Kenji ICHIKAWA, Taku YAMANAKA
  • Patent number: 11767379
    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: Grant
    Filed: March 1, 2019
    Date of Patent: September 26, 2023
    Assignee: 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: 11739205
    Abstract: A method for producing a composition containing low molecular weight polytetrafluoroethylene, the method including: (I) irradiating a composition containing high molecular weight polytetrafluoroethylene with ionizing radiation to obtain a composition containing low molecular weight polytetrafluoroethylene having a melt viscosity at 380° C. in the range of 1.0×102 to 7.0×105 Pa·s; and (II) carrying out fluorination treatment on the composition containing low molecular weight polytetrafluoroethylene obtained above.
    Type: Grant
    Filed: February 5, 2019
    Date of Patent: August 29, 2023
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Masayuki Tsuji, Taku Yamanaka, Yuuji Tanaka
  • Publication number: 20230220129
    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 R3 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, a composition including a fluoropolymer and the surfactant and a molded body including the composition.
    Type: Application
    Filed: March 9, 2023
    Publication date: July 13, 2023
    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: 20230203297
    Abstract: A modified polytetrafluoroethylene aqueous dispersion having low viscosity at high temperature. The modified polytetrafluoroethylene aqueous dispersion contains a modified polytetrafluoroethylene and a nonionic surfactant, has a modified polytetrafluoroethylene solid concentration of 50 to 70% by mass, is substantially free from a fluorine-containing surfactant, and has a viscosity at 55° C. of 80 mPa•s or lower, and the modified polytetrafluoroethylene contains 0.050% by mass or more and 1.00% by mass or less of a polymerized unit based on a modifying monomer.
    Type: Application
    Filed: March 6, 2023
    Publication date: June 29, 2023
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Takuya YAMABE, Emi YAMAMOTO, Yoshihiro SODA, Taku YAMANAKA, Ryota USAMI, Taketo KATO, Tomohiro SHIROMARU, Yasukazu NAKATANI
  • Publication number: 20230183430
    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: January 30, 2023
    Publication date: June 15, 2023
    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: 11634514
    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: Grant
    Filed: February 7, 2019
    Date of Patent: April 25, 2023
    Assignee: 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
  • Patent number: 11629238
    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: Grant
    Filed: October 23, 2020
    Date of Patent: April 18, 2023
    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