Patents by Inventor Tsutomu Nagamune
Tsutomu Nagamune 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: 20240052127Abstract: An objective of this disclosure is to provide a method of reusing a resin shaped product including an alicyclic structure-containing polymer, which can obtain a recycled article of the resin shaped product having reduced appearance defects and improved physical properties such as color tone. The presently disclosed method of reusing a resin shaped product including an alicyclic structure-containing polymer includes grinding the resin shaped product to obtain shaped product ground products; and dissolving the shaped product ground products in a mixed solvent containing not less than 80 weight % and not more than 98 weight % of cyclohexane and not less than 2 weight % and not more than 20 weight % of a hydrocarbon-based or aromatic solvent having a coagulation point of ?40° C. or lower per 100 weight % of the mixed solvent to obtain a polymer solution.Type: ApplicationFiled: January 21, 2022Publication date: February 15, 2024Applicant: ZEON CORPORATIONInventors: Tsutomu NAGAMUNE, Nobuhiro KUDO
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Patent number: 11235560Abstract: An electromagnetic wave absorption material comprises: fibrous carbon nanostructures; and an insulating material, wherein a content C of the fibrous carbon nanostructures when a content of the insulating material is 100 parts by mass is 5 parts by mass or more and 15 parts by mass or less, or, in the case where the fibrous carbon nanostructures are fibrous carbon nanostructures that exhibit a convex upward shape in a t-plot obtained from an adsorption isotherm, the content C is 0.3 parts by mass or more and 0.8 parts by mass or less, and the electromagnetic wave absorption material absorbs an electromagnetic wave in a frequency domain of more than 20 GHz.Type: GrantFiled: December 22, 2016Date of Patent: February 1, 2022Assignee: ZEON CORPORATIONInventors: Tsutomu Nagamune, Arinobu Katada
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Patent number: 10839976Abstract: Disclosed is a silicone rubber composition and a vulcanized product thereof, which show high levels of flexibility and electrical conductivity at the same time. The disclosed silicone rubber composition comprises a silicone rubber and fibrous carbon nanostructures including carbon nanotubes, wherein the fibrous carbon nanostructures exhibit a convex upward shape in a t-plot obtained from an adsorption isotherm. The disclosed vulcanized product is obtainable by vulcanization of the silicone rubber composition.Type: GrantFiled: February 26, 2016Date of Patent: November 17, 2020Assignee: ZEON CORPORATIONInventors: Masahiro Shigeta, Tsutomu Nagamune, Arinobu Katada
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Patent number: 10611640Abstract: Provided are a carbon film having excellent electrical conductivity and a method of producing this carbon film. The carbon film has a film surface glossiness at 60° of at least 2 and not more than 500. The method of producing the carbon film includes forming a carbon film by removing a solvent from a fibrous carbon nanostructure dispersion liquid containing the solvent and one or more fibrous carbon nanostructures.Type: GrantFiled: May 26, 2016Date of Patent: April 7, 2020Assignee: ZEON CORPORATIONInventors: Tsutomu Nagamune, Mitsugu Uejima, Tomoko Yamagishi
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Publication number: 20190387648Abstract: An electromagnetic wave shield structure comprises an electromagnetic wave shield layer that contains surface-treated fibrous carbon nanostructures obtained by treating surfaces of fibrous carbon nanostructures and has a weight per unit area of 0.5 g/m2 or more and 30 g/m2 or less.Type: ApplicationFiled: October 3, 2017Publication date: December 19, 2019Applicant: ZEON CORPORATIONInventor: Tsutomu NAGAMUNE
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Patent number: 10283231Abstract: An electrically conductive composition of the present invention contains an expanded graphite, carbon nanotubes, and a polymer compound. An amount of the expanded graphite to be contained is not less than 30 parts by weight and not more than 70 parts by weight with respect to 100 parts by weight of a total amount of the expanded graphite and the polymer compound. An amount of the carbon nanotubes to be contained is not less than 0.5 part by weight and not more than 10 parts by weight with respect to 100 parts by weight of the total amount of the expanded graphite and the polymer compound.Type: GrantFiled: May 14, 2013Date of Patent: May 7, 2019Assignee: ZEON CORPORATIONInventors: Tsutomu Nagamune, Masahiro Shigeta, The Ban Hoang, Mitsugu Uejima
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Publication number: 20180375215Abstract: An electromagnetic wave absorption material comprises surface-treated fibrous carbon nanostructures obtainable by treating surfaces of fibrous carbon nanostructures, wherein at surfaces of the surface-treated fibrous carbon nanostructures, an amount of an oxygen element is 0.030 times or more and 0.300 times or less an amount of a carbon element and/or an amount of a nitrogen element is 0.005 times or more and 0.200 times or less the amount of the carbon element.Type: ApplicationFiled: December 22, 2016Publication date: December 27, 2018Applicant: ZEON CORPORATIONInventors: Tsutomu NAGAMUNE, Yoshihisa TAKEYAMA
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Publication number: 20180370197Abstract: An electromagnetic wave absorption material comprises: fibrous carbon nanostructures; and an insulating material, wherein a content C of the fibrous carbon nanostructures when a content of the insulating material is 100 parts by mass is 5 parts by mass or more and 15 parts by mass or less, or, in the case where the fibrous carbon nanostructures are fibrous carbon nanostructures that exhibit a convex upward shape in a t-plot obtained from an adsorption isotherm, the content C is 0.3 parts by mass or more and 0.8 parts by mass or less, and the electromagnetic wave absorption material absorbs an electromagnetic wave in a frequency domain of more than 20 GHz.Type: ApplicationFiled: December 22, 2016Publication date: December 27, 2018Applicant: ZEON CORPORATIONInventors: Tsutomu NAGAMUNE, Arinobu KATADA
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Publication number: 20180127273Abstract: Provided are a carbon film having excellent electrical conductivity and a method of producing this carbon film. The carbon film has a film surface glossiness at 60° of at least 2 and not more than 500. The method of producing the carbon film includes forming a carbon film by removing a solvent from a fibrous carbon nanostructure dispersion liquid containing the solvent and one or more fibrous carbon nanostructures.Type: ApplicationFiled: May 26, 2016Publication date: May 10, 2018Applicant: ZEON CORPORATIONInventors: Tsutomu NAGAMUNE, Mitsugu UEJIMA, Tomoko YAMAGISHI
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Publication number: 20180044498Abstract: Disclosed is a silicone rubber composition and a vulcanized product thereof, which show high levels of flexibility and electrical conductivity at the same time. The disclosed silicone rubber composition comprises a silicone rubber and fibrous carbon nanostructures including carbon nanotubes, wherein the fibrous carbon nanostructures exhibit a convex upward shape in a t-plot obtained from an adsorption isotherm. The disclosed vulcanized product is obtainable by vulcanization of the silicone rubber composition.Type: ApplicationFiled: February 26, 2016Publication date: February 15, 2018Applicant: ZEON CORPORATIONInventors: Masahiro SHIGETA, Tsutomu NAGAMUNE, Arinobu KATADA
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Patent number: 9748016Abstract: A method of the present invention for producing a carbon nanotube includes: a dispersing step of dispersing a carbon nanotube in a solvent by carrying out a dispersion treatment that brings about a cavitation effect, the carbon nanotube having an average diameter (Av) and a diameter distribution (3?) that satisfy 0.60>3?/Av>0.20; and a mixing step of mixing carbon nanotube slurry obtained in the dispersing step with latex.Type: GrantFiled: October 26, 2012Date of Patent: August 29, 2017Inventors: Masahiro Shigeta, Tsutomu Nagamune, The Ban Hoang, Mitsugu Uejima
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Patent number: 9552904Abstract: A composition in accordance with the present invention contains a nano-carbon material, such as a carbon nanotube, and a polyether-based polymer containing oxirane monomer units at least part of which are oxirane monomer units each having a cationic group.Type: GrantFiled: June 28, 2012Date of Patent: January 24, 2017Assignee: ZEON CORPORATIONInventors: Shigetaka Hayano, Tsutomu Nagamune
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Publication number: 20150123043Abstract: An electrically conductive composition of the present invention contains an expanded graphite, carbon nanotubes, and a polymer compound. An amount of the expanded graphite to be contained is not less than 30 parts by weight and not more than 70 parts by weight with respect to 100 parts by weight of a total amount of the expanded graphite and the polymer compound. An amount of the carbon nanotubes to be contained is not less than 0.5 part by weight and not more than 10 parts by weight with respect to 100 parts by weight of the total amount of the expanded graphite and the polymer compound.Type: ApplicationFiled: May 14, 2013Publication date: May 7, 2015Applicant: Zeon CorporationInventors: Tsutomu Nagamune, Masahiro Shigeta, The Ban Hoang, Mitsugu Uejima
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Publication number: 20140353556Abstract: A method of the present invention for producing a carbon nanotube includes: a dispersing step of dispersing a carbon nanotube in a solvent by carrying out a dispersion treatment that brings about a cavitation effect, the carbon nanotube having an average diameter (Av) and a diameter distribution (3?) that satisfy 0.60>3?/Av>0.20; and a mixing step of mixing carbon nanotube slurry obtained in the dispersing step with latex.Type: ApplicationFiled: November 26, 2012Publication date: December 4, 2014Inventors: Masahiro Shigeta, Tsutomu Nagamune, The Ban Hoang, Mitsugu Uejima
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Publication number: 20140138589Abstract: A composition in accordance with the present invention contains a nano-carbon material, such as a carbon nanotube, and a polyether-based polymer containing oxirane monomer units at least part of which are oxirane monomer units each having a cationic group.Type: ApplicationFiled: June 28, 2012Publication date: May 22, 2014Applicant: ZEON CORPORATIONInventors: Shigetaka Hayano, Tsutomu Nagamune
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Patent number: 6965003Abstract: A block copolymer comprising a polymer block [A] and a polymer block [B]. The polymer block [A] contains mainly a repeating unit having an alicyclic structure, and the polymer block [B] contains the repeating unit having an alicyclic structure and a repeating unit derived from a diene based monomer and/or a vinyl based monomer. In any block, the carbon-carbon unsaturated bonds are hydrogenated. The block copolymer is molded into optical disks, optical waveguides, films, sheets, containers, and optical lenses.Type: GrantFiled: August 6, 2001Date of Patent: November 15, 2005Assignee: Zeon CorporationInventors: Atsushi Sone, Tsutomu Nagamune, Masakazu Hashimoto, Toru Murata
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Patent number: 6686430Abstract: A novel alicyclic hydrocarbon copolymer having a weight average molecular weight (Mw) of 1,000-1,000,000 a comprising repeating units (a) having an alicyclic structure and repeating units (b) having a chainlike structure; the sum of repeating units (a) and repeating units (b) being at least 90 wt. % based on the copolymer, and the content of repeating units (b) being at least 1 wt. % but smaller than 10 wt. %, based on the copolymer; and the chain of repeating units (a) satisfying the formula: A≦0.3×B where A=weight average molecular weight of the chain of repeating units (a), and B=Mw of the copolymer×(number of repeating units (a)/number of the total repeating units constituting the copolymer). The copolymer exhibits low birefringence and high mechanical strength. A process for producing the copolymer is provided.Type: GrantFiled: February 12, 2002Date of Patent: February 3, 2004Assignee: Zeon CorporationInventor: Tsutomu Nagamune
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Publication number: 20030207983Abstract: A block copolymer comprising a polymer block [A] and a polymer block [B]. The polymer block [A] contains mainly a repeating unit having an alicyclic structure, and the polymer block [B] contains the repeating unit having an alicyclic structure and a repeating unit derived from a diene based monomer and/or a vinyl based monomer. In any block, the carbon-carbon unsaturated bonds are hydrogenated. The block copolymer is molded into optical disks, optical waveguides, films, sheets, containers, and optical lenses.Type: ApplicationFiled: January 31, 2003Publication date: November 6, 2003Inventors: Atsushi Sone, Tsutomu Nagamune, Masakazu Hashimoto, Toru Murata
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Publication number: 20030083439Abstract: A molding material for plastic lenses, comprising a hydrogenated product of an aromatic vinyl polymer, wherein the hydrogenated product of the aromatic vinyl polymer has properties that the hydrogenation rate of aromatic rings is at least 97%, the weight average molecular weight (Mw) is within a range of 50,000 to 500,000, and the ratio (Mw/Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) is at most 2.5, a plastic lens obtained by molding the molding material, novel hydrogenated products of aromatic vinyl polymers, which are suitable for use as molding materials, and a production process thereof.Type: ApplicationFiled: July 8, 2002Publication date: May 1, 2003Inventors: Teruhiko Suzuki, Tsutomu Nagamune
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Patent number: 6500899Abstract: A molded or formed product obtained by molding or forming a resin composition comprising (A) at least one vinyl cyclic hydrocarbon polymer selected from the group consisting of hydrogenated products of aromatic vinyl polymers, vinylcyclohexene polymers or hydrogenated products thereof, and vinylcyclohexane polymers, and (B) at least one substance selected from the group consisting of compounding additives incompatible with the polymer, organic compounds having at least one alcoholic hydroxyl group and at least one ether linkage, and organic compounds having at least one alcoholic hydroxyl group and at least one ester linkage, wherein the initial light transmittance (a) of the molded or formed product at an optional wavelength within a range of 400 to 800 nm and the light transmittance (b) of the molded or formed product after the molded or formed product is held for 1,000 hours in an atmosphere of 65° C.Type: GrantFiled: November 21, 2001Date of Patent: December 31, 2002Assignee: Nippon Zeon Co., Ltd.Inventors: Teruhiko Suzuki, Tsutomu Nagamune, Teiji Kohara