Patents by Inventor Ayumu Tsukamoto
Ayumu Tsukamoto 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).
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Publication number: 20230335736Abstract: A porous carbon material having a first peak positioned in a pore diameter range of 3 nm or larger and smaller than 10 nm and a second peak positioned in a pore diameter range of 10 nm or larger and 10 ?m or smaller in a pore size distribution measured by a mercury intrusion method.Type: ApplicationFiled: September 9, 2021Publication date: October 19, 2023Applicant: Denka Company LimitedInventors: Shinichiro OSUMI, Yutaka TAKEUCHI, Ayumu TSUKAMOTO
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Patent number: 10714746Abstract: A conductive composition for electrode is provided that is excellent in conductivity and dispersibility. Further, an electrode for lithium ion secondary battery with lower plate resistance and a lithium ion secondary battery excellent in rate characteristics are provided that use this conductive composition. A conductive composition for electrode, including: carbon nanofiber with a median diameter D50 value by volume from 0.1 to 8 pm; an active material; and a binder enables production of an electrode for lithium ion secondary battery with lower plate resistance and a lithium ion secondary battery excellent in rate characteristics.Type: GrantFiled: August 6, 2015Date of Patent: July 14, 2020Assignee: Denka Company LimitedInventors: Yoko Horikoshi, Toru Arai, Hitoshi Kaneko, Tatsuya Nagai, Ayumu Tsukamoto
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Patent number: 10629326Abstract: By using CNF excellent in dispersibility, conductivity, and crystallinity, a conductive polymer material having high conductivity even with a low CNF content and a shaped article thereof and a conductive polymer material with a less CNF content for same conductivity and a shaped article thereof are provided. A conductive polymer material with high conductivity is produced by using carbon nanofiber with a median diameter D50 value from 0.1 to 8 ?m, powder resistivity of 0.03 ?cm or less measured under a load of 9.8 MPa, and D/G from 0.5 to 1.3.Type: GrantFiled: August 6, 2015Date of Patent: April 21, 2020Assignee: Denka Company LimitedInventors: Hitoshi Kaneko, Toru Arai, Yoko Horikoshi, Ayumu Tsukamoto, Akira Miyama
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Publication number: 20190330402Abstract: The purpose of the present invention is to provide: a cross-copolymer in which a residual catalyst component remains in a reduced amount and which has improved transparency, applicability to medical materials and yellowish discoloration resistance; and a method for producing the cross-copolymer.Type: ApplicationFiled: July 2, 2019Publication date: October 31, 2019Applicant: Denka Company LimitedInventors: Toru Arai, Ayumu Tsukamoto, Eri Sasaki
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Patent number: 10125207Abstract: The present invention addresses the problem of providing a cross-copolymer having excellent flexibility, heat resistance, cold resistance and mechanical properties. The present invention also addresses the problem of providing a resin composition which is prepared using the cross-copolymer, has excellent compatibility with polyolefin resins and aromatic resins, and has excellent flexibility, heat resistance and cold resistance.Type: GrantFiled: April 1, 2015Date of Patent: November 13, 2018Assignee: Denka Company LimitedInventors: Toru Arai, Tometomo Uchida, Ayumu Tsukamoto
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Patent number: 10087557Abstract: Provided is a method for producing carbon nanofibers having excellent conductivity, crystallinity and dispersibility. A method for producing carbon nanofibers, which uses an activated species mainly composed of cobalt as a catalyst, while using carbon monoxide as a carbon source. The catalyst is obtained by having a carrier, which is composed of an oxide having a specific surface area of 0.01-5 m2/g and containing magnesium, support 3-90% by mass of the activated species. By controlling the reaction temperature, the carbon monoxide partial pressure and the gas flow rate of the carbon monoxide, CNF having more excellent conductivity, crystallinity and dispersibility can be produced, thereby obtaining carbon nanofibers having excellent conductivity, crystallinity and dispersibility.Type: GrantFiled: July 25, 2016Date of Patent: October 2, 2018Assignee: DENKA COMPANY LIMITEDInventors: Hitoshi Kaneko, Toru Arai, Yoko Horikoshi, Ayumu Tsukamoto
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Publication number: 20180216255Abstract: Provided is a method for producing carbon nanotibers having excellent conductivity, crystallinity and dispersibility. A method for producing carbon nanofibers, which uses an activated species mainly composed of cobalt as a catalyst, while using carbon monoxide as a carbon source. The catalyst is obtained by having a carrier, which is composed of an oxide having a specific surface area of 0.01-5 m2/g and containing magnesium, support 3-90% by mass of the activated species. By controlling the reaction temperature, the carbon monoxide partial pressure and the gas flow rate of the carbon monoxide, CNF having more excellent conductivity, crystallinity and dispersibility can be produced, thereby obtaining carbon nanofibers having excellent conductivity, crystallinity and dispersibility.Type: ApplicationFiled: July 25, 2016Publication date: August 2, 2018Inventors: Hitoshi KANEKO, Toru ARAI, Yoko HORIKOSHI, Ayumu TSUKAMOTO
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Publication number: 20170365372Abstract: By using CNF excellent in dispersibility, conductivity, and crystallinity, a conductive polymer material having high conductivity even with a low CNF content and a shaped article thereof and a conductive polymer material with a less CNF content for same conductivity and a shaped article thereof are provided. A conductive polymer material with high conductivity is produced by using carbon nanofiber with a median diameter D50 value from 0.1 to 8 ?m, powder resistivity of 0.03 ?cm or less measured under a load of 9.8 MPa, and D/G from 0.5 to 1.3.Type: ApplicationFiled: August 6, 2015Publication date: December 21, 2017Applicant: Denka Company LimitedInventors: Hitoshi Kaneko, Toru Arai, Yoko Horikoshi, Ayumu Tsukamoto, Akira Miyama
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Publication number: 20170288218Abstract: A conductive composition for electrode is provided that is excellent in conductivity and dispersibility. Further, an electrode for lithium ion secondary battery with lower plate resistance and a lithium ion secondary battery excellent in rate characteristics are provided that use this conductive composition. A conductive composition for electrode, including: carbon nanofiber with a median diameter D50 value by volume from 0.1 to 8 ?m; an active material; and a binder enables production of an electrode for lithium ion secondary battery with lower plate resistance and a lithium ion secondary battery excellent in rate characteristics.Type: ApplicationFiled: August 6, 2015Publication date: October 5, 2017Applicant: Denka Company LimitedInventors: Yoko Horikoshi, Toru Arai, Hitoshi Kaneko, Tatsuya Nagai, Ayumu Tsukamoto
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Patent number: 9738993Abstract: A manufacturing method of carbon nanofibers at a high activity is provided. Further, carbon nanofibers produced by the manufacturing method and being excellent in electric conductivity, crystallinity and dispersibility is provided. By a manufacturing method of carbon nanofibers in which an active species including cobalt as a chief component is employed as a catalyst and carbon monoxide is used as a carbon source, wherein said catalyst has 3 to 150 mass % of said active species carried on a carrier composed of a magnesium-containing oxide having a specific surface area of 0.01 to 5 m2/g, and a reaction temperature, partial pressure of carbon monoxide and a flow rate of raw material gas is controlled, CNFs that are excellent in electric conductivity, crystallinity and dispersibility can be manufactured at high activity, so that carbon nanofibers that is excellent in electric conductivity, crystallinity and dispersibility is obtained.Type: GrantFiled: February 3, 2015Date of Patent: August 22, 2017Assignee: Denka Company LimitedInventors: Hitoshi Kaneko, Toru Arai, Masaya Umeyama, Yoko Tamura, Ayumu Tsukamoto
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Publication number: 20170145135Abstract: The purpose of the present invention is to provide: a cross-copolymer in which a residual catalyst component remains in a reduced amount and which has improved transparency, applicability to medical materials and yellowish discoloration resistance; and a method for producing the cross-copolymer.Type: ApplicationFiled: May 14, 2015Publication date: May 25, 2017Applicant: Denka Company LimitedInventors: Toru Arai, Ayumu Tsukamoto, Eri Sasaki
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Publication number: 20170037174Abstract: The present invention addresses the problem of providing a cross-copolymer having excellent flexibility, heat resistance, cold resistance and mechanical properties. The present invention also addresses the problem of providing a resin composition which is prepared using the cross-copolymer, has excellent compatibility with polyolefin resins and aromatic resins, and has excellent flexibility, heat resistance and cold resistance.Type: ApplicationFiled: April 1, 2015Publication date: February 9, 2017Applicant: Denka Company LimitedInventors: Toru ARAI, Tometomo UCHIDA, Ayumu TSUKAMOTO
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Publication number: 20160348282Abstract: A manufacturing method of carbon nanofibers at a high activity is provided. Further, carbon nanofibers produced by the manufacturing method and being excellent in electric conductivity, crystallinity and dispersibility is provided. By a manufacturing method of carbon nanofibers in which an active species including cobalt as a chief component is employed as a catalyst and carbon monoxide is used as a carbon source, wherein said catalyst has 3 to 150 mass % of said active species carried on a carrier composed of a magnesium-containing oxide having a specific surface area of 0.01 to 5 m2/g, and a reaction temperature, partial pressure of carbon monoxide and a flow rate of raw material gas is controlled, CNFs that are excellent in electric conductivity, crystallinity and dispersibility can be manufactured at high activity, so that carbon nanofibers that is excellent in electric conductivity, crystallinity and dispersibility is obtained.Type: ApplicationFiled: February 3, 2015Publication date: December 1, 2016Applicant: Denka Company LimitedInventors: Hitoshi Kaneko, Toru Arai, Masaya Umeyama, Yoko Tamura, Ayumu Tsukamoto
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Patent number: 8722831Abstract: To provide a novel cross copolymer and resin composition which are improved in heat resistance and compatibility over conventional ethylene/aromatic vinyl compound copolymers and which have low crystallinity, are excellent in softness, transparency and compatibility and show mechanical properties similar to soft vinyl chloride resins, as compared with conventional cross copolymers.Type: GrantFiled: May 29, 2007Date of Patent: May 13, 2014Assignee: Denki Kagaku Kogyo Kabushiki KaishaInventors: Toru Arai, Masaru Hasegawa, Ayumu Tsukamoto, Akira Miyama, Shigeru Suzuki
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Publication number: 20090263604Abstract: To provide a novel cross copolymer and resin composition which are improved in heat resistance and compatibility over conventional ethylene/aromatic vinyl compound copolymers and which have low crystallinity, are excellent in softness, transparency and compatibility and show mechanical properties similar to soft vinyl chloride resins, as compared with conventional cross copolymers.Type: ApplicationFiled: May 29, 2007Publication date: October 22, 2009Applicant: Denki Kagaku Kogyo Kabushiki KaishaInventors: Toru Arai, Masaru Hasegawa, Ayumu Tsukamoto, Akira Miyama, Shigeru Suzuki
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Publication number: 20090202824Abstract: Provided are a tape substrate having excellent oil resistance as well as balanced properties of flexibility, a hand cutting property and heat resistance, and an adhesive tape using the tape substrate. The tape substrate contains an ethylene-aromatic vinyl compound copolymer with an isotactic stereoregularity. Furthermore, the ethylene-aromatic vinyl compound copolymer is one having an alternating structure of ethylene and the aromatic vinyl compound represented by the formula (1) below, and an isotactic diad index m of Ph (an aromatic group) in the structure of the copolymer being more than 0.75: where Ph is an aromatic group and xa is the number of repeating units and an integer of at least 2.Type: ApplicationFiled: May 22, 2007Publication date: August 13, 2009Applicant: DENKI KAGAKU KOGYO KABUSHIKI KAISHAInventors: Mizuki Hasumi, Seiji Saita, Masaru Hasegawa, Shigeru Suzuki, Akira Miyama, Ayumu Tsukamoto, Toru Arai