Patents by Inventor Shoji Tamai
Shoji Tamai 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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Patent number: 8288058Abstract: This invention provides a binder for a fuel cell which has high adhesion, low methanol solubility, high methanol permeability and high proton conductivity, a composition for electrode formation, an electrode for a fuel cell, and a fuel cell using them. The binder is particularly suitable for a binder for a direct methanol type fuel cell which requires high proton conductivity. The binder for a fuel cell comprises a block copolymer which comprises a block having a repeating structural unit of a divalent aromatic group that contains a protonic acid group and a block having a repeating structural unit of a divalent aromatic group that does not contain a protonic acid group, and which has a glass transition temperature (Tg) of 180° C. or less. In particular, it is preferable that the block copolymer has an ion exchange group equivalent of from 200 to 1,000 g/mole and a weight retention ratio of 90% or more as measured by immersion in a 64 weight % aqueous methanol solution at 25° C. for 24 hours.Type: GrantFiled: July 21, 2005Date of Patent: October 16, 2012Assignee: Mitsui Chemicals, Inc.Inventors: Masahiro Toriida, Junichi Ishikawa, Takehiko Omi, Satoko Fujiyama, Kuniyuki Takamatsu, Shoji Tamai
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Patent number: 7345135Abstract: The invention provides a crosslinkable aromatic resin having a protonic acid group and a crosslinkable group, suitable for electrolytic membranes and binders used in fuel cells, etc., and electrolytic polymer membranes, binders and fuel cells using the resin. The crosslinkable aromatic resin has a crosslinkable group, which is not derived from the protonic acid group and can form a polymer network without any elimination component. This resin exhibits excellent ion conductivity, heat resistance, water resistance, adhesion property and low methanol permeability. Preferably, the crosslinkable group is composed of a C1 to C10 alkyl group directly bonded to the aromatic ring and/or an alkylene group having 1 to 3 carbon atoms in the main chain in which at least one carbon atom directly bonded to the aromatic ring bonds to hydrogen, and a carbonyl group, or a carbon-carbon double bond or triple bond.Type: GrantFiled: April 9, 2004Date of Patent: March 18, 2008Assignee: Mitsui Chemicals, Inc.Inventors: Junichi Ishikawa, Takashi Kuroki, Satoko Fujiyama, Takehiko Omi, Tomoyuki Nakata, Yuichi Okawa, Kazuhisa Miyazaki, Shigeharu Fujii, Shoji Tamai
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Publication number: 20070292733Abstract: This invention provides a binder for a fuel cell which has high adhesion, low methanol solubility, high methanol permeability and high proton conductivity, a composition for electrode formation, an electrode for a fuel cell, and a fuel cell using them. The binder is particularly suitable for a binder for a direct methanol type fuel cell which requires high proton conductivity. The binder for a fuel cell comprises a block copolymer which comprises a block having a repeating structural unit of a divalent aromatic group that contains a protonic acid group and a block having a repeating structural unit of a divalent aromatic group that does not contain a protonic acid group, and which has a glass transition temperature (Tg) of 180° C. or less. In particular, it is preferable that the block copolymer has an ion exchange group equivalent of from 200 to 1,000 g/mole and a weight retention ratio of 90% or more as measured by immersion in a 64 weight % aqueous methanol solution at 25° C. for 24 hours.Type: ApplicationFiled: July 21, 2005Publication date: December 20, 2007Applicant: Mitsui Chemicals, Inc.Inventors: Masahiro Toriida, Junichi Ishikawa, Takehiko Omi, Satoko Fujiyama, Kuniyuki Takamatsu, Shoji Tamai
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Patent number: 7217780Abstract: There are disclosed, a polyether ketone having a primary particle size of 50 ?m or less; and a method of producing a polyether ketone by a desalting polycondensation, which contains a step of conducting a polymerization reaction under a condition of deposition of the polymer. The polyether ketone obtained by the present invention has small particle size, high molecular weight and sufficiently small content of impurities such as alkali metal components.Type: GrantFiled: December 10, 2002Date of Patent: May 15, 2007Assignee: Mitsui Chemicals, Inc.Inventors: Masahiro Toriida, Takashi Kuroki, Takaharu Abe, Akira Hasegawa, Kuniyuki Takamatsu, Yoshiteru Taniguchi, Isao Hara, Setsuko Fujiyoshi, Tadahito Nobori, Shoji Tamai
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Publication number: 20060251951Abstract: An intermediate layer (161) is formed between a catalyst layer (112) and a solid polymer electrolyte membrane (114). The intermediate layer (161) contains a protonic acid group-containing aromatic polyether ketone and catalyst particles.Type: ApplicationFiled: March 24, 2004Publication date: November 9, 2006Inventors: Takeshi Obata, Shin Nakamura, Tsutomu Yoshitake, Yoshimi Kubo, Takehiko Omi, Shoji Tamai, Takashi Kuroki, Shuhei Ikado
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Patent number: 6916898Abstract: A process of preparing a polyimide of the present invention comprises effecting an imidization reaction of a diamine and a tetracarboxylic dianhydride in a solvent containing 50 to 100% by weight of an equimolar composition of a nitrogen-containing cyclic compound indicated by chemical formula (1) below and a phenol indicated by chemical formula (2) below: in formula (1), X represents —CH2— or —N(CH3)—, and in formula (2), R1 and R2 may be the same as, or different from, each other and represent each any one of —H, —OH, —CH3, —C2H5, —C3H7, —C4H9, —C5H11, —C6H13, —C7H15, —C8H17, —C9H19, —C10H21, —OCH3, —O(C6H5), —NO2, —Cl, —Br and —F.Type: GrantFiled: March 13, 2001Date of Patent: July 12, 2005Assignee: Mitsui Chemicals, Inc.Inventors: Takashi Kuroki, Atsushi Shibuya, Shoji Tamai
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Patent number: 6917275Abstract: The present invention provides a magnetic core whose outer surface has been coated without handling brittle ribbon to thereby impart insulating properties and shape retention properties to the magnetic core after annealing heat treatment, and further provides an adhesive resin composition for a magnetic core, which is useful for efficiently producing the above-mentioned magnetic core without using any organic solvent and which per se is stable to heat and elapse of time. By forming a coating film having a certain thickness or more on an outer surface using a composition containing a resin of specific properties, there can be obtained a magnetic core whose outer surface has been coated without handling brittle ribbon to thereby impart insulating properties and shape retention properties to the magnetic core after annealing heat treatment.Type: GrantFiled: April 12, 2002Date of Patent: July 12, 2005Assignee: Mitsui Chemicals, Inc.Inventors: Takashi Ono, Mitsunobu Yoshida, Nobuhiro Maruko, Takashi Kuroki, Shoji Tamai, Kouichi Kanayama, Hiroshi Watanabe
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Publication number: 20050085597Abstract: There are disclosed, a polyether ketone having a primary particle size of 50 ?m or less; and a method of producing a polyether ketone by a desalting polycondensation, which contains a step of conducting a polymerization reaction under a condition of deposition of the polymer. The polyether ketone obtained by the present invention has small particle size, high molecular weight and sufficiently small content of impurities such as alkali metal components.Type: ApplicationFiled: December 10, 2002Publication date: April 21, 2005Inventors: Masahiro Toriida, Takashi Kuroki, Takaharu Abe, Akira Hasegawa, Kuniyuki Takamatsu, Yoshiteru Taniguchi, Isao Hara, Setsuko Fujiyoshi, Tadahito Nobori, Shoji Tamai
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Publication number: 20040191602Abstract: The invention provides a crosslinkable aromatic resin having a protonic acid group and a crosslinkable group, suitable for electrolytic membranes and binders used in fuel cells, etc., and electrolytic polymer membranes, binders and fuel cells using the resin. The crosslinkable aromatic resin has a crosslinkable group, which is not derived from the protonic acid group and can form a polymer network without any elimination component. This resin exhibits excellent ion conductivity, heat resistance, water resistance, adhesion property and low methanol permeability. Preferably, the crosslinkable group is composed of a C1 to C10 alkyl group directly bonded to the aromatic ring and/or an alkylene group having 1 to 3 carbon atoms in the main chain in which at least one carbon atom directly bonded to the aromatic ring bonds to hydrogen, and a carbonyl group, or a carbon-carbon double bond or triple bond.Type: ApplicationFiled: April 9, 2004Publication date: September 30, 2004Applicant: MITSUI CHEMICALS, INC.Inventors: Junichi Ishikawa, Takashi Kuroki, Satoko Fujiyama, Takehiko Omi, Tomoyuki Nakata, Yuichi Okawa, Kazuhisa Miyazaki, Shigeharu Fujii, Shoji Tamai
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Publication number: 20040137247Abstract: The present invention provides a magnetic core whose outer surface has been coated without handling brittle ribbon to thereby impart insulating properties and shape retention properties to the magnetic core after annealing heat treatment, and further provides an adhesive resin composition for a magnetic core, which is useful for efficiently producing the above-mentioned magnetic core without using any organic solvent and which per se is stable to heat and elapse of time. By forming a coating film having a certain thickness or more on an outer surface using a composition containing a resin of specific properties, there can be obtained a magnetic core whose outer surface has been coated without handling brittle ribbon to thereby impart insulating properties and shape retention properties to the magnetic core after annealing heat treatment.Type: ApplicationFiled: October 10, 2003Publication date: July 15, 2004Inventors: Takashi Ono, Mitsunobu Yoshida, Nobuhiro Maruko, Takashi Kuroki, Shoji Tamai, Kouichi Kanayama, Hiroshi Watanabe
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Publication number: 20030158370Abstract: A process of preparing a polyimide of the present invention comprises effecting an imidization reaction of a diamine and a tetracarboxylic dianhydride in a solvent containing 50 to 100% by weight of an equimolar composition of a nitrogen-containing cyclic compound indicated by chemical formula (1) below and a phenol indicated by chemical formula (2) below: 1Type: ApplicationFiled: September 13, 2002Publication date: August 21, 2003Inventors: Takashi Kuroki, Atsushi Shibuya, Shoji Tamai
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Patent number: 6599675Abstract: A polyimide having a repeating unit of the general formula (I) and a polyamic acid having a repeating unit of the formula (IV): (wherein, R1 and R2 represent H or a C1 to C20 alkyl group, and Z represents a condensed polycyclic aromatic group or an group of the following formulae: Herein, X represents —CO— or —C(═N2)—, Y represents a direct bond, —CH2—, —O—, —SO2—, —S—, —CO— or —C(═N2)—, and W represents a direct bond, —CH2—, —C(CH3)2—, —C(CF3)2—, —S—, —SO—, —SO2— or —O—, b, m and n are 0 or 1; r is a C1 to 4 alkyl group, halogen group or phenyl group; a is 0 or 1 to 3).Type: GrantFiled: December 19, 2001Date of Patent: July 29, 2003Assignee: Mitsui Chemicals, Inc.Inventors: Jun Kamada, Ken-ichi Goto, Takashi Kuroki, Shoji Tamai
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Publication number: 20030064235Abstract: For providing a polyimide optical component exhibiting good physical properties inherent to a polyimide, i.e.Type: ApplicationFiled: April 9, 2002Publication date: April 3, 2003Inventors: Yuichi Okawa, Yoshihiro Sakata, Takashi Ono, Shoji Tamai
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Patent number: 6531568Abstract: This invention provides crosslinkable-group-containing polyimides of various known thermoplastic polyimide backbone structures, which are provided with far better heat resistance, chemical resistance and mechanical properties than known polyimides of the structures without impairing excellent moldability or formability, superb sliding property, low water absorption property, outstanding electrical properties, high thermal oxidation stability and high radiation resistance, all of which are inherent to the structures.Type: GrantFiled: April 9, 2001Date of Patent: March 11, 2003Assignee: Mitsui Chemicals, Inc.Inventors: Atsushi Shibuya, Tomomi Okumura, Hideaki Oikawa, Yoshihiro Sakata, Takashi Kuroki, Yuichi Okawa, Shoji Tamai
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Publication number: 20020182536Abstract: A polyimide having a repeating unit of the general formula (I) and a polyamic acid having a repeating unit of the formula (IV): 1Type: ApplicationFiled: December 19, 2001Publication date: December 5, 2002Inventors: Jun Kamada, Ken-ichi Goto, Takashi Kuroki, Shoji Tamai
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Patent number: 6458912Abstract: A thermoplastic polyimide having good thermal stability, comprising a repeating unit represented by the chemical formula (1), a molecular terminal being composed of the chemical formula (2) and/or chemical formula (3), characterized in that: a melt viscosity ratio calculated by the numerical formula (1) and/or the numerical formula (3) is within a numerical range shown in the numerical formula (2) and/or the numerical formula (4) and 1,3-bis(4-aminophenoxy)benzene represented by the chemical formula (3) for production of the above polyimide, characterized in that the content of an azo compound is from 0.0 to 0.2%. The thermoplastic polyimide of the present invention has excellent characteristics {circle around (1)} to {circle around (4)} described below. {circle around (1)} It is superior in thermal stability on melting. That is, the degree of lowering of the fluidity on melting with a lapse of time is small and it is possible to apply to conventional melt molding.Type: GrantFiled: February 5, 2001Date of Patent: October 1, 2002Assignee: Mitsui Chemicals, Inc.Inventors: Takashi Kuroki, Yoshihiro Sakata, Tomomi Okumura, Atsushi Shibuya, Yuichi Okawa, Hideaki Oikawa, Kayako Yanagihara, Yasunori Yoshida, Masaji Yoshimura, Hiroyasu Kido, Shoji Tamai
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Patent number: 6103806Abstract: A polyimide resin composition is disclosed herein which comprises 5 to 60% by weight of a polyimide [polyimide (1)] having a repeating unit represented by the chemical formula 1 and 40 to 95% by weight of a polyimide [polyimide (2)] having a repeating unit represented by the chemical formula 2.Type: GrantFiled: December 21, 1998Date of Patent: August 15, 2000Assignee: Mitsui Chemicals, Inc.Inventors: Hiroyasu Kido, Masaji Yoshimura, Yasunori Yoshida, Kayako Yanagihara, Hideaki Oikawa, Shoji Tamai, Tomohito Koba
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Patent number: 5916488Abstract: A printing ink for an optical filter, comprising a polyimide resin containing at least one perfluoroalkyl group in each recurring structural unit, at least one dyestuff soluble in the resin, the dyestuff having absorption in the visible range and/or the near infrared range and a solvent.Type: GrantFiled: April 28, 1998Date of Patent: June 29, 1999Assignee: Mitsui Chemicals, Inc.Inventors: Keisuke Takuma, Kazuhiro Seino, Tsutami Misawa, Shoji Tamai, Wataru Yamashita
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Patent number: 5892061Abstract: A preparation process of isoimide comprising reacting a compound having one or more carboxyl group and one or more amide bond in the same molecule in the presence of a haloiminium salt and basic substance, and a preparation process of isoimide comprising reacting a compound having one or more carboxyl group with a compound having one or more amide bond in the presence of a haloiminium salt and basic substance are disclosed.Type: GrantFiled: November 21, 1997Date of Patent: April 6, 1999Assignee: Mitsui Chemicals, Inc.Inventors: Kan Ikeda, Wataru Yamashita, Shoji Tamai
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Patent number: 5868968Abstract: A polyimide resin composition for an optical filter which includes a colorless transparent polyimide resin containing at least one perfluoroalkyl group in each recurring structural unit and having excellent solvent solubility, and at least one dyestuff soluble in said resin. The dyestuff has absorption in the visible range and/or the near infrared range. A printing ink for an optical filter is composed of the polyimide resin composition and a solvent while an optical filter formed from a transparent base material and the polyimide resin composition can also be provided.Type: GrantFiled: November 6, 1997Date of Patent: February 9, 1999Assignee: Mitsui Chemicals, Inc.Inventors: Keisuke Takuma, Kazuhiro Seino, Tsutami Misawa, Shoji Tamai, Wataru Yamashita