Patents by Inventor Yoshitaka Yamakawa

Yoshitaka Yamakawa 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: 20140154610
    Abstract: An aromatic copolymer comprises a hydrophilic segment (A) and a hydrophobic segment (B), wherein the hydrophilic segment (A) comprises a structural unit (1) having a proton conductive group, and the hydrophobic segment (B) comprises at least one structural unit selected from the group consisting of a structural unit (2) and a structural unit (3), wherein the structural unit (2) is a divalent structural unit having an aromatic ring and no proton conductive groups and having two bonding sites at the para-position of one ring included in the aromatic ring, and the structural unit (3) is a divalent structural unit having a benzene ring and is a structural unit different from the structural unit (2), the hydrophobic segment (B) in its entirety contained in the aromatic copolymer including both the structural unit (2) and the structural unit (3).
    Type: Application
    Filed: July 27, 2012
    Publication date: June 5, 2014
    Applicant: JSR CORPORATION
    Inventors: Takuya Murakami, Toshiaki Kadota, Yoshitaka Yamakawa
  • Patent number: 8729219
    Abstract: A polyarylene block copolymer can provide a solid polymer electrolyte and proton conductive membrane having high proton conductivity, high dimensional stability, and high mechanical strength. The polyarylene block copolymer also has reduced swelling in hot water and reduced shrinkage in drying. The polyarylene block copolymer includes a polymer segment having a sulfonic acid group, and a polymer segment having substantially no sulfonic acid group.
    Type: Grant
    Filed: June 8, 2011
    Date of Patent: May 20, 2014
    Assignee: JSR Corporation
    Inventors: Yoshitaka Yamakawa, Toshiaki Kadota, Takuya Murakami, Yuuji Tsunoda
  • Patent number: 8431676
    Abstract: The invention described herein relates to a polyarylene copolymer comprising a structural unit represented by formula (1?): where the structural variables are defined herein. The invention also relates to a solid polymer electrolyte, a proton conductive membrane and A proton conductive membrane for direct methanol fuel cell which contains the polyarylene copolymer.
    Type: Grant
    Filed: April 24, 2007
    Date of Patent: April 30, 2013
    Assignee: JSR Corporation
    Inventors: Yoshitaka Yamakawa, Yousuke Konno, Teruhiko Umehara
  • Publication number: 20130085236
    Abstract: A polyarylene block copolymer can provide a solid polymer electrolyte and proton conductive membrane having high proton conductivity, high dimensional stability, and high mechanical strength. The polyarylene block copolymer also has reduced swelling in hot water and reduced shrinkage in drying. The polyarylene block copolymer includes a polymer segment having a sulfonic acid group, and a polymer segment having substantially no sulfonic acid group.
    Type: Application
    Filed: June 8, 2011
    Publication date: April 4, 2013
    Applicant: JSR CORPORATION
    Inventors: Yoshitaka Yamakawa, Toshiaki Kadota, Takuya Murakami, Yuuji Tsunoda
  • Patent number: 8399148
    Abstract: Provided is a varnish which contains a solvent and an electrode electrolyte for a solid polymer fuel cell electrolyte, which contains a polymer with a structure having a main chain including a polyphenylene, a side chain including a sulfonic acid group and a repeating structural unit as a side chain including a nitrogen-containing heterocyclic group.
    Type: Grant
    Filed: August 8, 2011
    Date of Patent: March 19, 2013
    Assignees: JSR Corporation, Honda Motor Co., Ltd.
    Inventors: Makoto Higami, Igor Rozhanskii, Yoshitaka Yamakawa, Nagayuki Kanaoka, Kaoru Fukuda, Ryoichiro Takahashi, Hiroshi Shinkai
  • Patent number: 8349994
    Abstract: Disclosed is an electrode electrolyte for solid polymer fuel cells, which uses a polymer electrolyte containing a polyarylene copolymer containing a nitrogen-containing aromatic ring having a substituent represented by —SO3H, —(O(CH2)hSO3H or —O(CF2)hSO3H (wherein h represents an integer of 1-12). By having such a constitution, the electrode electrolyte for solid polymer fuel cells can be produced at a low cost, while being excellent in proton conductivity, dimensional stability, hydrothermal resistance and mechanical strength. In addition, this electrode electrolyte for solid polymer fuel cells enables to recover a catalyst metal.
    Type: Grant
    Filed: May 16, 2008
    Date of Patent: January 8, 2013
    Assignees: JSR Corporation, Honda Motor Co., Ltd.
    Inventors: Toshiaki Kadota, Yoshitaka Yamakawa, Fusao Nakagawa, Nagayuki Kanaoka, Takaki Nakagawa
  • Patent number: 8309678
    Abstract: Provided is a solid polymer electrolyte having increased heat resistance and high proton conductivity and a proton conductive membrane composed of the electrolyte. Also provided is a copolymer having a sulfonic acid group.
    Type: Grant
    Filed: May 16, 2008
    Date of Patent: November 13, 2012
    Assignee: JSR Corporation
    Inventors: Toshiaki Kadota, Yoshitaka Yamakawa
  • Publication number: 20120052412
    Abstract: A polyarylene copolymer having a sulfonic acid group which has high proton conductivity and reduced swelling in hot water and reduced shrinkage in drying; a solid polymer electrolyte and a proton conductive membrane comprising the copolymer; and a membrane-electrode assembly using these. The polyarylene block copolymer comprises a polymer segment (A) having a sulfonic acid group, and a polymer segment (B) having substantially no sulfonic acid group, the polymer segment (B) having substantially no sulfonic acid group comprising a structural unit represented by the following formula (1).
    Type: Application
    Filed: August 19, 2011
    Publication date: March 1, 2012
    Applicants: HONDA MOTOR CO., LTD., JSR CORPORATION
    Inventors: Yoshitaka YAMAKAWA, Toshiaki KADOTA, Takuya MURAKAMI, Yuuji TSUNODA, Masaru IGUCHI, Kaoru FUKUDA
  • Publication number: 20120040271
    Abstract: An electrode electrolyte for a solid polymer electrolyte-type fuel cell contains a polymer, which has a polyphenylene structure as a main chain and both a sulfonic acid group and a nitrogen-containing heterocyclic group as a side chain. A side chain having the nitrogen-containing heterocyclic group has a structure represented by the following general formula (D). where Z represents at least one kind of structures selected from a group consisting of a direct bond, —O— and —S—, Y represents at least one member selected from a group consisting of —CO—, —SO2—, —SO—, —CONH—, —COO—, —(CF2)1— (1 is an integer of 1 to 10) and —C(CF3)2, R20 represents a specified nitrogen-containing heterocyclic group, q represents an integer of 1 to 5 and p represents an integer of 0 to 4.
    Type: Application
    Filed: August 8, 2011
    Publication date: February 16, 2012
    Applicants: Honda Motor Co., Ltd., JSR Corporation
    Inventors: Makoto Higami, Igor Rozhanskii, Yoshitaka Yamakawa, Nagayuki Kanaoka, Kaoru Fukuda, Ryoichiro Takahashi, Hiroshi Shinkai
  • Patent number: 8043762
    Abstract: The present invention provides an electrode paste which comprises catalyst particles, a solvent and an varnish which comprises a solvent and an electrode electrolyte for a solid polymer fuel cell electrolyte, wherein the electrode electrolyte comprises a polymer with a structure having a main chain including a polyphenylene, a side chain including a sulfonic acid group and a repeating structural unit represented by formula (C) as a side chain including a nitrogen-containing heterocyclic group; wherein the structural variables are defined herein.
    Type: Grant
    Filed: June 30, 2006
    Date of Patent: October 25, 2011
    Assignees: JSR Corporation, Honda Motor Co., Ltd.
    Inventors: Makoto Higami, Igor Rozhanskii, Yoshitaka Yamakawa, Nagayuki Kanaoka, Kaoru Fukuda, Ryoichiro Takahashi, Hiroshi Shinkai
  • Patent number: 7906608
    Abstract: A nitrogen-containing aromatic compound is represented by Formula (1). A polymer is obtained by polymerizing the compound. wherein X is an atom or a group selected from halogen atoms other than fluorine and —OSO2Rb (wherein Rb is an alkyl group, a fluorine-substituted alkyl group or an aryl group); Y is at least one structure selected from the group consisting of —CO—, —SO2—, —SO—, —CONH—, —COO—, —(CF2)1— (wherein l is an integer of 1 to 10) and —C(CF3)2—; Z is at least one structure selected from the group consisting of a direct bond, —O— and —S—; R20 is a nitrogen-containing heterocyclic group; q is an integer of 1 to 5; and p is an integer of 0 to 4.
    Type: Grant
    Filed: June 30, 2006
    Date of Patent: March 15, 2011
    Assignee: JSR Corporation
    Inventors: Makoto Higami, Igor Rozhanskii, Yoshitaka Yamakawa
  • Patent number: 7893303
    Abstract: A polyarylene having a structural unit shown by the following formula (1) is disclosed. wherein X and Y indicate a divalent organic group or a single bond, Z shows an oxygen atom or a sulfur atom, R represents at least one atom or group selected from the group consisting of a hydrogen atom, a fluorine atom, an alkyl group, and a fluorine-substituted alkyl group, a is an integer of 1 to 20, n is an integer of 1 to 5, and p is an integer of 0 to 10.
    Type: Grant
    Filed: February 4, 2005
    Date of Patent: February 22, 2011
    Assignee: JSR Corporation
    Inventors: Yoshitaka Yamakawa, Makoto Higami
  • Publication number: 20100174042
    Abstract: Sulfonated polymers have excellent processability and methanol resistance.
    Type: Application
    Filed: April 24, 2007
    Publication date: July 8, 2010
    Applicant: JSR CORPORATION
    Inventors: Yoshitaka Yamakawa, Yousuke Konno, Teruhiko Umehara
  • Publication number: 20100167161
    Abstract: Disclosed is an electrode electrolyte for solid polymer fuel cells, which uses a polymer electrolyte containing a polyarylene copolymer containing a nitrogen-containing aromatic ring having a substituent represented by —SO3H, —(O(CH2)hSO3H or —O(CF2)hSO3H (wherein h represents an integer of 1-12). By having such a constitution, the electrode electrolyte for solid polymer fuel cells can be produced at a low cost, while being excellent in proton conductivity, dimensional stability, hydrothermal resistance and mechanical strength. In addition, this electrode electrolyte for solid polymer fuel cells enables to recover a catalyst metal.
    Type: Application
    Filed: May 16, 2008
    Publication date: July 1, 2010
    Inventors: Toshiaki Kadota, Yoshitaka Yamakawa, Fusao Nakagawa, Nagayuki Kanaoka, Takaki Nakagawa
  • Publication number: 20100152308
    Abstract: Provided is a solid polymer electrolyte having increased heat resistance and high proton conductivity and a proton conductive membrane composed of the electrolyte. Also provided is a copolymer having a sulfonic acid group.
    Type: Application
    Filed: May 16, 2008
    Publication date: June 17, 2010
    Applicant: JSR Corporation
    Inventors: Toshiaki Kadota, Yoshitaka Yamakawa
  • Patent number: 7651802
    Abstract: Disclosed is a polymer electrolyte having a protonic acid group that is excellent in thermal stability and dimensional stability. The polymer electrolyte includes copolymers having a sulfonic acid group which has a structure represented by the following formula: wherein X is a divalent electron-withdrawing group; Y is an oxygen or a sulfur; Z and Q are each a direct bond, —O—, —S—, —CO—, —SO2—, —[C(R?)2]g— (g: integer of from 1 to 8), etc.; R, R? and R1 to R16 are each a hydrogen, a fluorine, an alkyl, a fluorine-substituted alkyl, an aryl or a nitrile; m, n, p, q, r, s, t and u are each an integer of from 0 to 4 (with the proviso that p+q?1); and A is a group represented by Formula (5a) or (5b) below: wherein W is a divalent electron-withdrawing group; S is a protonic acid group; i is an integer of from 1 to 5; and j is an integer of from 1 to 7.
    Type: Grant
    Filed: March 15, 2006
    Date of Patent: January 26, 2010
    Assignees: JSR Corporation, Honda Motor Co., Ltd.
    Inventors: Yoshitaka Yamakawa, Toshihiro Ohtsuki, Kohei Goto, Toshiaki Kadota, Teruhiko Umehara, Nagayuki Kanaoka, Masaru Iguchi, Hiroshi Sohma
  • Publication number: 20090149623
    Abstract: A nitrogen-containing aromatic compound is represented by Formula (1). A polymer is obtained by polymerizing the compound. wherein X is an atom or a group selected from halogen atoms other than fluorine and —OSO2Rb (wherein Rb is an alkyl group, a fluorine-substituted alkyl group or an aryl group); Y is at least one structure selected from the group consisting of —CO—, —SO2—, —SO—, —CONH—, —COO—, —(CF2)l— (wherein l is an integer of 1 to 10) and —C(CF3)2—; Z is at least one structure selected from the group consisting of a direct bond, —O— and —S—; R20 is a nitrogen-containing heterocyclic group; q is an integer of 1 to 5; and p is an integer of 0 to 4.
    Type: Application
    Filed: June 30, 2006
    Publication date: June 11, 2009
    Applicant: JSR Corporation
    Inventors: Makoto Higami, Igor Rozhanskii, Yoshitaka Yamakawa
  • Publication number: 20090149625
    Abstract: Sulfonated polyarylenes have excellent processability and methanol resistance. The polyarylene includes a structural unit (S) represented by Formula (2-2) below and a structural unit (T) represented by Formula (2-3) below, the structural unit (S) accounting for a proportion “s” of 95 to 50 mol %, the structural unit (T) accounting for a proportion “t” of 5 to 50 mol % (“s”+“t”=100 mol %): wherein each A independently represents a divalent linking group represented by —CO— or —SO2—; and R1 to R4 each independently represent a hydrogen atom, a fluorine atom, an alkyl group or an aryl group.
    Type: Application
    Filed: April 24, 2007
    Publication date: June 11, 2009
    Applicant: JSR CORPORATION
    Inventors: Yoshitaka Yamakawa, Yousuke Konno, Kohei Goto
  • Publication number: 20090130526
    Abstract: This invention provides an electrode electrolyte for a solid polymer-type fuel cell, in which a cost problem and a problem related to recovery of catalyst metals are solved, having excellent proton conductivity, dimensional stability and heat resistance. An electrode electrolyte for a solid polymer electrolyte-type fuel cell contains a polymer, which has a polyphenylene structure as a main chain and both a sulfonic acid group and a nitrogen-containing heterocyclic group as a side chain. A side chain having the nitrogen-containing heterocyclic group has a structure represented by the following general formula (D). (In formula, Z represents at least one kind of structures selected from a group consisting of a direct bond, —O— and —S—, Y represents at least one kind of structures selected from a group consisting of —CO—, —SO2—, —SO—, —CONH—, —COO—, —(CF2)1— (1 is an integer of 1 to 10) and —C(CF3)2— and R20 represents a nitrogen-containing heterocyclic group.
    Type: Application
    Filed: June 30, 2006
    Publication date: May 21, 2009
    Applicants: JSR CORPORATION, HONDA MOTOR CO., LTD.
    Inventors: Makoto Higami, Igor Rozhanskii, Yoshitaka Yamakawa, Nagayuki Kanaoka, Kaoru Fukuda, Ryoichiro Takahashi, Hiroshi Shinkai
  • Publication number: 20080015389
    Abstract: A polyarylene having a structural unit shown by the following formula (1) is disclosed. wherein X and Y indicate a divalent organic group or a single bond, Z shows an oxygen atom or a sulfur atom, R represents at least one atom or group selected from the group consisting of a hydrogen atom, a fluorine atom, an alkyl group, and a fluorine-substituted alkyl group, a is an integer of 1 to 20, n is an integer of 1 to 5, and p is an integer of 1 to 10.
    Type: Application
    Filed: February 4, 2005
    Publication date: January 17, 2008
    Applicant: JSR Corporation
    Inventors: Yoshitaka Yamakawa, Makoto Higami