Patents Assigned to ASTOM CORPORATION
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Publication number: 20240399319Abstract: The present invention provides an anion exchange membrane that has low electrical resistance when used in electrodialysis, is produced without an increase in cost, and is excellent in selective permeability to monovalent anions, and a method for producing the same. The anion exchange membrane has a tertiary amino group and a quaternary ammonium group as functional groups, such that an intensity ratio of the tertiary amino group to the quaternary ammonium group is 1.0 or more as measured by X-ray photoelectron spectroscopy on a surface of the anion exchange membrane having the tertiary amino group and the quaternary ammonium group as the functional groups.Type: ApplicationFiled: August 24, 2022Publication date: December 5, 2024Applicants: ASTOM Corporation, TOKUYAMA CORPORATIONInventors: Kazuo MIZUGUCHI, Nobuhiko OHMURA, Masayuki KISHINO, Michihito NAKATANI
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Publication number: 20240181403Abstract: An anion exchange membrane includes an anion exchange resin layer 3 reinforced with a backing material sheet 5. The anion exchange resin layer 3 includes an anion exchange resin that has as an anion exchange group a pyridinium group formed by protonation of a pyridyl group, and a vinyl chloride resin as a thickener. The backing material sheet 5 is made of a polyethylene woven fabric.Type: ApplicationFiled: December 27, 2021Publication date: June 6, 2024Applicant: ASTOM CorporationInventors: Maki KINOSHITA, Masayuki KISHINO, Kenji FUKUTA
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Publication number: 20230166219Abstract: A cation-exchange membrane using a polyolefin-based substrate with reduced swelling of an ion-exchange resin and a low electrical resistance is provided. The cation-exchange membrane of the present invention includes a substrate made of polyolefin-based woven fabric, and a sulfonic acid group-containing cation-exchange resin. A portion of the cation-exchange membrane other than the substrate has 23 mass % or more to 35 mass % or less of polyvinyl chloride.Type: ApplicationFiled: March 8, 2021Publication date: June 1, 2023Applicant: ASTOM CORPORATIONInventors: Naoto TAKASHINA, Masayuki KISHINO, Kenji FUKUTA
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Publication number: 20230119424Abstract: An anion-exchange membrane of the present invention includes a substrate made of polyolefin-based woven fabric and an anion-exchange resin, and has an electrical resistance measured using 0.5 M NaCl solution at 25° C. of 1.0 ?•cm2 or more to 2.5 ?•cm2 or less, a bursting strength of 0.7 MPa or more to 1.2 MPa or less, a water permeation rate measured using pressured water at 0.1 MPa of 300 ml/(m2•hr) or less, a thickness of the substrate of 90 µm or more to 160 µm or less, and an open area ratio of the substrate of 35% or more to 55% or less.Type: ApplicationFiled: March 12, 2021Publication date: April 20, 2023Applicant: ASTOM CORPORATIONInventors: Takaaki OKAMURA, Masayuki KISHINO, Kenji FUKUTA
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Publication number: 20230067288Abstract: A bipolar membrane in which a cation-exchange membrane and an anion-exchange membrane are joined to each other, wherein a leakage ratio of gluconic acid at 60° C. is not more than 1.0%, and the cation-exchange membrane is supported by a polyolefin reinforcing member and, further, contains a polyvinyl chloride.Type: ApplicationFiled: November 8, 2022Publication date: March 2, 2023Applicant: ASTOM CorporationInventors: Masayuki KISHINO, Kouta YUZUKI, Kenji FUKUTA
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Patent number: 11511237Abstract: A polymerizable composition for forming an ion-exchange resin precursor, the polymerizable composition containing a monomer component and polyethylene particles in an amount of 50 to 120 parts by mass per 100 parts by mass of the monomer component, wherein the monomer component contains an aromatic monomer for introducing ion-exchange groups and a nitrogen-containing aliphatic monomer, the nitrogen-containing aliphatic monomer being present in an amount of 10 to 35% by mass in said monomer component. An ion-exchange membrane is produced by applying the polymerizable composition onto a polyolefin type filament base material and polymerizing the polymerizable composition to form an ion-exchange resin precursor and, thereafter, introducing ion-exchange groups into the precursor.Type: GrantFiled: March 9, 2021Date of Patent: November 29, 2022Assignee: ASTOM CORPORATIONInventors: Maki Kinoshita, Masayuki Kishino, Shunichiro Nakatsukasa, Kenji Fukuta
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Publication number: 20210187446Abstract: A polymerizable composition for forming an ion-exchange resin precursor, the polymerizable composition containing a monomer component and polyethylene particles in an amount of 50 to 120 parts by mass per 100 parts by mass of the monomer component, wherein the monomer component contains an aromatic monomer for introducing ion-exchange groups and a nitrogen-containing aliphatic monomer, the nitrogen-containing aliphatic monomer being present in an amount of 10 to 35% by mass in said monomer component. An ion-exchange membrane is produced by applying the polymerizable composition onto a polyolefin type filament base material and polymerizing the polymerizable composition to form an ion-exchange resin precursor and, thereafter, introducing ion-exchange groups into the precursor.Type: ApplicationFiled: March 9, 2021Publication date: June 24, 2021Applicant: ASTOM CorporationInventors: Maki KINOSHITA, Masayuki KISHINO, Shunichiro NAKATSUKASA, Kenji FUKUTA
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Patent number: 10974209Abstract: A polymerizable composition for forming an ion-exchange resin precursor, the polymerizable composition containing a monomer component and polyethylene particles in an amount of 50 to 120 parts by mass per 100 parts by mass of the monomer component, wherein the monomer component contains an aromatic monomer for introducing ion-exchange groups and a nitrogen-containing aliphatic monomer, the nitrogen-containing aliphatic monomer being present in an amount of 10 to 35% by mass in said monomer component. An ion-exchange membrane is produced by applying the polymerizable composition onto a polyolefin type filament base material and polymerizing the polymerizable composition to form an ion-exchange resin precursor and, thereafter, introducing ion-exchange groups into the precursor.Type: GrantFiled: August 30, 2017Date of Patent: April 13, 2021Assignee: ASTOM CORPORATIONInventors: Maki Kinoshita, Masayuki Kishino, Shunichiro Nakatsukasa, Kenji Fukuta
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Publication number: 20210008499Abstract: A bipolar membrane BP characterized in that particles 5 of a basic metal chloride are distributed in the interface between a cation-exchange membrane 1 and an anion-exchange membrane 3.Type: ApplicationFiled: March 19, 2019Publication date: January 14, 2021Applicant: ASTOM CORPORATIONInventors: Minoru KAWASHIMA, Kenji FUKUTA
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Patent number: 10583430Abstract: An ion exchange membrane having a structure that an ion exchange resin is filled in spaces of a porous base film, the porous base film has a structure that at least two porous olefin resin layers are laminated with a bonding strength of 100 gf/cm or more to less than 700 gf/cm and a Gurley air permeance of 500 sec/100 ml or less in terms of a 100 ?m thick film. In this ion exchange membrane, base film has high air permeability though it has a multi-layer structure that a plurality of porous resin films are bonded together, and therefore a rise in electric resistance caused by the lamination of the base sheets is effectively suppressed.Type: GrantFiled: July 16, 2015Date of Patent: March 10, 2020Assignee: ASTOM CORPORATIONInventors: Tomoaki Takahashi, Hiroshi Miyazawa, Nobuyuki Tanaka, Nobuhiko Ohmura, Kazuo Mizuguchi, Kenji Fukuta
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Publication number: 20190176098Abstract: A polymerizable composition for forming an ion-exchange resin precursor, the polymerizable composition containing a monomer component and polyethylene particles in an amount of 50 to 120 parts by mass per 100 parts by mass of the monomer component, wherein the monomer component contains an aromatic monomer for introducing ion-exchange groups and a nitrogen-containing aliphatic monomer, the nitrogen-containing aliphatic monomer being present in an amount of 10 to 35% by mass in said monomer component. An ion-exchange membrane is produced by applying the polymerizable composition onto a polyolefin type filament base material and polymerizing the polymerizable composition to form an ion-exchange resin precursor and, thereafter, introducing ion-exchange groups into the precursor.Type: ApplicationFiled: August 30, 2017Publication date: June 13, 2019Applicant: ASTOM CorporationInventors: Maki KINOSHITA, Masayuki KISHINO, Shunichiro NAKATSUKASA, Kenji FUKUTA
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Publication number: 20190118144Abstract: A bipolar membrane in which a cation-exchange membrane and an anion-exchange membrane are joined to each other, wherein a leakage ratio of gluconic acid at 60° C. is not more than 1.0%, and the cation-exchange membrane is supported by a polyolefin reinforcing member and, further, contains a polyvinyl chloride.Type: ApplicationFiled: April 13, 2017Publication date: April 25, 2019Applicant: ASTOM CorporationInventors: Masayuki KISHINO, Kouta YUZUKI, Kenji FUKUTA
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Publication number: 20170216832Abstract: An ion exchange membrane having a structure that an ion exchange resin is filled in spaces of a porous base film, the porous base film has a structure that at least two porous olefin resin layers are laminated with a bonding strength of 100 gf/cm or more to less than 700 gf/cm and a Gurley air permeance of 500 sec/100 ml or less in terms of a 100 ?m thick film. In this ion exchange membrane, base film has high air permeability though it has a multi-layer structure that a plurality of porous resin films are bonded together, and therefore a rise in electric resistance caused by the lamination of the base sheets is effectively suppressed.Type: ApplicationFiled: July 16, 2015Publication date: August 3, 2017Applicant: ASTOM CORPORATIONInventors: Tomoaki TAKAHASHI, Hiroshi MIYAZAWA, Nobuyuki TANAKA, Nobuhiko OHMURA, Kazuo MIZUGUCHI, Kenji FUKUTA
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Patent number: 9162185Abstract: An ion-exchange membrane including a porous unstretched polyethylene sheet in which fine pores are piercing, the pores being filled with an ion-exchange resin. The ion-exchange membrane exhibits excellent concentration property.Type: GrantFiled: March 28, 2012Date of Patent: October 20, 2015Assignee: ASTOM CorporationInventors: Nobuhiko Ohmura, Kazuo Mizuguchi, Kazunori Nishio, Toshio Aritomi
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Patent number: 8980070Abstract: To provide a bipolar membrane featuring improved adhesion between an anion-exchange membrane and a cation-exchange membrane without accompanied by an increase in the membrane voltage. [Means for Solution] A bipolar membrane comprising a cation-exchange membrane and an anion-exchange membrane joined together facing each other, wherein at least one of the ion exchange membranes contains a chlorinated polyolefin.Type: GrantFiled: December 7, 2009Date of Patent: March 17, 2015Assignee: Astom CorporationInventors: Kazunori Nishio, Kazuo Mizuguchi, Minoru Kawashima, Toshio Aritomi
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Publication number: 20140014519Abstract: An ion-exchange membrane including a porous unstretched polyethylene sheet in which fine pores are piercing, the pores being filled with an ion-exchange resin. The ion-exchange membrane exhibits excellent concentration property.Type: ApplicationFiled: March 28, 2012Publication date: January 16, 2014Applicant: ASTOM CORPORATIONInventors: Nobuhiko Ohmura, Kazuo Mizuguchi, Kazunori Nishio, Toshio Aritomi
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Patent number: 8530018Abstract: [Problems] To provide an ion exchanger having excellent electric properties, a low electric resistance, excellent mechanical strength and, at the same time, having excellent contamination resistance. [Means for Solution] An ion exchanger comprises a melt-extrusion-formed body of a resin composition containing a granular ion-exchange resin and a low-melting polyolefin resin having a melting point of not higher than 170° C., the melt-extrusion-formed body: (a) containing the granular ion-exchange resin at a ratio of not less than 30% by weight but less than 50% by weight, and the low-melting polyolefin resin in an amount of more than 100 parts by weight but not more than 150 parts by weight per 100 parts by weight of the granular ion-exchange resin; (b) having a melt index in a range of 1 to 5 g/10 min. as measured at 190° C.; and (c) having a water content of not less than 30%.Type: GrantFiled: March 24, 2010Date of Patent: September 10, 2013Assignee: Astom CorporationInventors: Kazunori Nishio, Eiji Asada, Toshio Aritomi, Masayuki Adachi
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Publication number: 20130146450Abstract: [Problems] To provide an ion-exchange membrane using an inexpensive nonwoven fabric sheet as a base sheet, featuring excellent properties such as strength, dimensional stability and shape stability, effectively suppressing undulation when it is brought into contact with the electrolyte, and having a low membrane resistance and stable properties. [Means for Solution] An ion-exchange membrane comprising a nonwoven fabric sheet 1 and an ion-exchange resin coating 3 formed on one surface of the nonwoven fabric sheet 1, the nonwoven fabric sheet 1 having a fiber layer structure that includes long filament layers 5 of a fiber diameter of 8 to 30 ?m on both surfaces thereof and an extra-fine filament layer 7 of a fiber diameter of not more than 5 ?m as an intermediate layer formed by melt-adhesion of fibers between the long filament layers 5.Type: ApplicationFiled: August 8, 2011Publication date: June 13, 2013Applicants: ASAHI KASEI FIBERS CORPORATION, ASTOM CORPORATIONInventors: Masayuki Kishino, Toshio Aritomi, Kiyotaka Yoshie, Minoru Yoshida, Tatsuhiko Miya, Ikuo Ueno