Patents by Inventor Mayumi Kakuta
Mayumi Kakuta 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: 7449132Abstract: The present invention provides a proton conductive membrane having capabilities of self-generating water and maintaining water, excellent ion conductivity and excellent effect of inhibiting crossover and usable for solid polymer electrolyte type fuel cells and also provides a proton conductive composition used for preparing the proton conductive membrane. The proton conductive composition comprises 100 parts by weight of a polyarylene having a sulfonic group and 0.01 to 80 parts by weight of at least one metal catalyst selected from the group consisting of platinum, gold, palladium, rhodium, iridium and ruthenium, or comprises 100 parts by weight of a polyarylene having a sulfonic group, 0.01 to 80 parts by weight of the metal catalyst, and 0.01 to 50 parts by weight of metal oxide fine particles and/or fibers in total.Type: GrantFiled: November 24, 2004Date of Patent: November 11, 2008Assignees: JSR Corporation, Honda Motor Co., Ltd.Inventors: Mayumi Kakuta, Toshihiro Otsuki, Nagayuki Kanaoka, Masaaki Nanaumi, Yoichi Asano, Ryoichiro Takahashi
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Patent number: 7001929Abstract: The invention provides a proton conductive membrane excellent in heat resistance, which has sulfonic acid as ion exchange groups. The proton conductive membrane comprises a nitrogen-containing compound that can be mixed with water in arbitrary proportions and has a boiling point of not lower than 100. degree. C. and a proton conductive resin which has sulfonic acid ion-exchange groups, wherein the nitrogen-containing compound is contained in an amount of 0.5 to 10 parts by weight based on 100 parts by weight of the proton conductive resin.Type: GrantFiled: August 15, 2003Date of Patent: February 21, 2006Assignees: JSR Corporation, Honda Giken Kogyo Kabushiki KaishaInventors: Kohei Goto, Mayumi Kakuta, Fusazumi Masaka, Kiyonori Kita, Naoki Mitsuta, Masaru Iguchi, Hiroshi Soma, Nagayuki Kanaoka
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Publication number: 20050130024Abstract: The invention provides a proton conductive membrane which, even when reduced in thickness, does not allow penetration of an electrode to prevent a short circuit between electrodes and which permits sufficient generating performance. A proton conductive composition capable of forming the membrane is also provided. The proton conductive composition includes a nonconductive filler and a polyarylene having a sulfonic group. The proton conductive membrane, comprising the composition, contains the nonconductive filler in an amount of 3 to 50% by volume, and the nonconductive filler particles have diameters ranging from 3 to 90% the thickness of the membrane.Type: ApplicationFiled: December 9, 2004Publication date: June 16, 2005Inventors: Toshihiro Otsuki, Junji Kawai, Mayumi Kakuta, Nagayuki Kanaoka, Yoichi Asano, Ryoichiro Takahashi
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Publication number: 20050116206Abstract: The present invention provides a proton conductive membrane having capabilities of self-generating water and maintaining water, excellent ion conductivity and excellent effect of inhibiting crossover and usable for solid polymer electrolyte type fuel cells and also provides a proton conductive composition used for preparing the proton conductive membrane. The proton conductive composition comprises 100 parts by weight of a polyarylene having a sulfonic group and 0.01 to 80 parts by weight of at least one metal catalyst selected from the group consisting of platinum, gold, palladium, rhodium, iridium and ruthenium, or comprises 100 parts by weight of a polyarylene having a sulfonic group, 0.01 to 80 parts by weight of the metal catalyst, and 0.01 to 50 parts by weight of metal oxide fine particles and/or fibers in total.Type: ApplicationFiled: November 24, 2004Publication date: June 2, 2005Inventors: Mayumi Kakuta, Toshihiro Otsuki, Nagayuki Kanaoka, Masaaki Nanaumi, Yoichi Asano, Ryoichiro Takahashi
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Publication number: 20050106469Abstract: A proton conductive membrane exhibiting superior proton conductivity even at high temperatures of 100° C. or above, and a proton conductive composition capable of forming the membrane are provided. The invention also provides a proton conductive membrane showing excellent proton conductivity even if it does not have an increased amount of the sulfonic groups introduced therein, and a proton conductive composition capable of forming the membrane. The proton conductive composition includes (a) at least one compound selected from a metal oxide hydrate, a phyllosilicate and a hygroscopic inorganic porous compound, and (b) a polyarylene having a sulfonic group.Type: ApplicationFiled: November 18, 2004Publication date: May 19, 2005Inventors: Junji Kawai, Toshihiro Otsuki, Mayumi Kakuta, Kohei Goto, Nagayuki Kanaoka, Yoichi Asano, Ryoichiro Takahashi
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Patent number: 6812290Abstract: A polyarylene copolymer which comprises (A) aromatic compound units having a main chain containing one or more electron-withdrawing groups therein and (B) aromatic compound units having a main chain containing no electron-withdrawing groups therein, and a proton-conductive membrane comprising the polyarylene copolymer having sulfonic acid groups.Type: GrantFiled: November 26, 2002Date of Patent: November 2, 2004Assignee: JSR CorporationInventors: Kohei Goto, Yoshitaka Yamakawa, Mayumi Kakuta, Igor Rozhanskii
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Publication number: 20040151984Abstract: The invention provides a proton conductive membrane excellent in heat resistance, which has sulfonic acid as ion exchange groups.Type: ApplicationFiled: August 15, 2003Publication date: August 5, 2004Applicants: JSR Corporation, Honda Giken Kogyo Kabushiki KaishaInventors: Kohei Goto, Mayumi Kakuta, Fusazumi Masaka, Kiyonori Kita, Naoki Mitsuta, Masaru Iguchi, Hiroshi Soma, Nagayuki Kanaoka
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Publication number: 20040110053Abstract: A proton conductive composition comprises a heteropolyacid and a polyarylene having a sulfonic group. The composition has good water resistance and toughness, and shows an excellent proton conductivity without any treatment to increase the acid concentration in the sulfonated polyarylene. A proton conductive membrane is also provided that is derived from the composition.Type: ApplicationFiled: October 8, 2003Publication date: June 10, 2004Inventors: Kohei Goto, Mayumi Kakuta, Yoichi Asano
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Publication number: 20040043297Abstract: The invention provides a proton conductive resin composition from which proton conductive membranes exhibiting high proton conductivity can be obtained without treatment to increase the acid concentration in the membrane. The invention also provides a method for preparing the composition, and a proton conductive membrane comprising the composition.Type: ApplicationFiled: August 15, 2003Publication date: March 4, 2004Applicants: JSR CORPORATION, HONDA GIKEN KOGYO KABUSHIKI KAISHAInventors: Kohei Goto, Mayumi Kakuta, Yoichi Asano, Nagayuki Kanaoka
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Publication number: 20030195301Abstract: A polyarylene copolymer which comprises (A) aromatic compound units having a main chain containing one or more electron-withdrawing groups therein and (B) aromatic compound units having a main chain containing no electron-withdrawing groups therein, and a proton-conductive membrane comprising the polyarylene copolymer having sulfonic acid groups.Type: ApplicationFiled: November 26, 2002Publication date: October 16, 2003Applicant: JSR CORPORATIONInventors: Kohei Goto, Yoshitaka Yamakawa, Mayumi Kakuta, Igor Rozhanskii
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Patent number: 6555626Abstract: A polyarylene copolymer which comprises (A) from 60 to 3 mol % aromatic compound units having a main chain containing one or more electron-withdrawing groups therein and (B) from 40 to 97 mol % aromatic compound units having a main chain containing no electron-withdrawing groups therein (provided that (A)+(B)=100 mol %), and a proton-conductive membrane comprising the polyarylene copolymer having sulfonic acid groups.Type: GrantFiled: March 28, 2001Date of Patent: April 29, 2003Assignee: JSR CorporationInventors: Kohei Goto, Yoshitaka Yamakawa, Mayumi Kakuta, Igor Rozhanskii
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Patent number: 6376634Abstract: A composition for film formation which is useful as an interlayer insulating film material in the production of semiconductor devices and the like, and gives a coating film having excellent uniformity, low dielectric constant, low leakage current and excellent storage stability; and a material for insulating film formation using the composition. The composition comprises (A) a product of hydrolysis and condensation obtained by hydrolyzing and condensing at least one compound selected from the group consisting of (A-1) compounds represented by the formula (1): R1aSi(OR2)4−a, and (A-2) compounds represented by the formula (2): R3b(R4O)3−bSi—(R7)d—Si(OR5)3−cR6c; and (B) a compound represented by the formula (3): R8O (CHCH3CH2O)eR9.Type: GrantFiled: June 2, 2000Date of Patent: April 23, 2002Assignee: JSR CorporationInventors: Michinori Nishikawa, Kinji Yamada, Mayumi Kakuta, Yasutake Inoue, Masahiko Ebisawa, Satoko Hakamatsuka, Kentarou Tamaki
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Publication number: 20010037000Abstract: A polyarylene copolymer which comprises (A) from 60 to 3 mol % aromatic compound units having a main chain containing one or more electron-withdrawing groups therein and (B) from 40 to 97 mol % aromatic compound units having a main chain containing no electron-withdrawing groups therein (provided that (A)+(B)=100 mol %), and a proton-conductive membrane comprising the polyarylene copolymer having sulfonic acid groups.Type: ApplicationFiled: March 28, 2001Publication date: November 1, 2001Applicant: JSR CORPORATIONInventors: Kohei Goto, Yoshitaka Yamakawa, Mayumi Kakuta, Igor Rozhanskii
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Patent number: 6084053Abstract: Electronic parts and a process for manufacturing the electronic parts are provided. The electronic parts comprise an electric insulating material exhibiting a high heat resistance and low dielectric constant as a structural component. The electric insulating material is formed of a polyimide containing a recurring unit represented by the following general formula (1).Type: GrantFiled: April 15, 1998Date of Patent: July 4, 2000Assignee: JSR CorporationInventors: Minoru Matsubara, Yasutake Inoue, Mayumi Kakuta, Igor Rozhanskii, Kohei Goto