Patents by Inventor Tomoki Kawakita
Tomoki Kawakita 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: 9842916Abstract: The invention provides an oxide semiconductor layer that has less cracks and is excellent in electrical property and stability, as well as a semiconductor element and an electronic device each including the oxide semiconductor layer. The invention provides an exemplary method of producing an oxide semiconductor layer, and the method includes the precursor layer forming step of forming, on or above a substrate, a layered oxide semiconductor precursor including a compound of metal to be oxidized into an oxide semiconductor dispersed in a solution including a binder made of aliphatic polycarbonate, and the annealing step of heating the precursor layer at a first temperature achieving decomposition of 90 wt % or more of the binder, and then annealing the precursor layer at a temperature equal to or higher than a second temperature (denoted by X) that is higher than the first temperature, achieves bonding between the metal and oxygen, and has an exothermic peak value in differential thermal analysis (DTA).Type: GrantFiled: December 13, 2016Date of Patent: December 12, 2017Assignees: JAPAN ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY, SUMITOMO SEIKA CHEMICALS CO., LTD.Inventors: Satoshi Inoue, Tatsuya Shimoda, Tomoki Kawakita, Nobutaka Fujimoto, Kiyoshi Nishioka
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Patent number: 9783665Abstract: This invention provides a polyolefin-based resin composition excellent in mechanical strength and elasticity. The polyolefin-based resin composition comprises a polyolefin-based resin, and, per 100 parts by mass of the polyolefin-based resin, 0.05 to 10 parts by mass of an aliphatic polycarbonate resin and 0.01 to 2 parts by mass of an acid modified polypropylene.Type: GrantFiled: April 24, 2014Date of Patent: October 10, 2017Assignee: SUMITOMO SEIKA CHEMICALS CO., LTD.Inventors: Nobutaka Fujimoto, Kiyoshi Nishioka, Tomoki Kawakita, Koh-Hei Nitta, Makiko Nakahara
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Publication number: 20170117393Abstract: The invention provides an oxide semiconductor layer that has less cracks and is excellent in electrical property and stability, as well as a semiconductor element and an electronic device each including the oxide semiconductor layer. The invention provides an exemplary method of producing an oxide semiconductor layer, and the method includes the precursor layer forming step of forming, on or above a substrate, a layered oxide semiconductor precursor including a compound of metal to be oxidized into an oxide semiconductor dispersed in a solution including a binder made of aliphatic polycarbonate, and the annealing step of heating the precursor layer at a first temperature achieving decomposition of 90 wt % or more of the binder, and then annealing the precursor layer at a temperature equal to or higher than a second temperature (denoted by X) that is higher than the first temperature, achieves bonding between the metal and oxygen, and has an exothermic peak value in differential thermal analysis (DTA).Type: ApplicationFiled: December 13, 2016Publication date: April 27, 2017Inventors: Satoshi INOUE, Tatsuya SHIMODA, Tomoki KAWAKITA, Nobutaka FUJIMOTO, Kiyoshi NISHIOKA
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Patent number: 9552985Abstract: The invention provides an oxide semiconductor layer that has less cracks and is excellent in electrical property and stability, as well as a semiconductor element and an electronic device each including the oxide semiconductor layer. The invention provides an exemplary method of producing an oxide semiconductor layer, and the method includes the precursor layer forming step of forming, on or above a substrate, a layered oxide semiconductor precursor including a compound of metal to be oxidized into an oxide semiconductor dispersed in a solution including a binder made of aliphatic polycarbonate, and the annealing step of heating the precursor layer at a first temperature achieving decomposition of 90 wt % or more of the binder, and then annealing the precursor layer at a temperature equal to or higher than a second temperature (denoted by X) that is higher than the first temperature, achieves bonding between the metal and oxygen, and has an exothermic peak value in differential thermal analysis (DTA).Type: GrantFiled: July 4, 2014Date of Patent: January 24, 2017Assignees: JAPAN ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY, SUMITOMO SEIKA CHEMICALS CO., LTD.Inventors: Satoshi Inoue, Tatsuya Shimoda, Tomoki Kawakita, Nobutaka Fujimoto, Kiyoshi Nishioka
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Publication number: 20160280898Abstract: This invention provides a polyolefin-based resin composition excellent in mechanical strength and elasticity. The polyolefin-based resin composition comprises a polyolefin-based resin, and, per 100 parts by mass of the polyolefin-based resin, 0.05 to 10 parts by mass of an aliphatic polycarbonate resin and 0.01 to 2 parts by mass of an acid modified polypropylene.Type: ApplicationFiled: April 24, 2014Publication date: September 29, 2016Applicant: Sumitomo Seika Chemicals Co.,Ltd.Inventors: Nobutaka FUJIMOTO, Kiyoshi NISHIOKA, Tomoki KAWAKITA, Koh-hei NITTA, Makiko NAKAHARA
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Patent number: 9414487Abstract: The present invention provides a metal paste composition which can obtain the calcined bodies having low volume resistivity in a wiring substrate after calcining. More specifically, the present invention provides a metal paste composition comprising a metal, an aliphatic polycarbonate, and an organic solvent.Type: GrantFiled: March 6, 2012Date of Patent: August 9, 2016Assignees: SUMITOMO SEIKA CHEMICALS CO., LTD., OSAKA MUNICIPAL TECHNICAL RESEARCH INSTITUTEInventors: Nobutaka Fujimoto, Tomoki Kawakita, Ryou Miyabara, Masami Nakamoto, Toshinobu Ohno, Mari Yamamoto, Yukiyasu Kashiwagi
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Publication number: 20160181098Abstract: The invention provides an oxide semiconductor layer that has less cracks and is excellent in electrical property and stability, as well as a semiconductor element and an electronic device each including the oxide semiconductor layer. The invention provides an exemplary method of producing an oxide semiconductor layer, and the method includes the precursor layer forming step of forming, on or above a substrate, a layered oxide semiconductor precursor including a compound of metal to be oxidized into an oxide semiconductor dispersed in a solution including a binder made of aliphatic polycarbonate, and the annealing step of heating the precursor layer at a first temperature achieving decomposition of 90 wt % or more of the binder, and then annealing the precursor layer at a temperature equal to or higher than a second temperature (denoted by X) that is higher than the first temperature, achieves bonding between the metal and oxygen, and has an exothermic peak value in differential thermal analysis (DTA).Type: ApplicationFiled: July 4, 2014Publication date: June 23, 2016Inventors: Satoshi INOUE, Tatsuya SHIMODA, Tomoki KAWAKITA, Nobutaka FUJIMOTO, Kiyoshi NISHIOKA
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Publication number: 20140008588Abstract: The present invention provides a metal paste composition which can obtain the calcined bodies having low volume resistivity in a wiring substrate after calcining. More specifically, the present invention provides a metal paste composition comprising a metal, an aliphatic polycarbonate, and an organic solvent.Type: ApplicationFiled: March 6, 2012Publication date: January 9, 2014Applicants: OSAKA MUNICIPAL TECHNICAL RESEARCH INSTITUTE, SUMITOMO SEIKA CHEMICALS CO., LTD.Inventors: Nobutaka Fujimoto, Tomoki Kawakita, Ryou Miyabara, Masami Nakamoto, Toshinobu Ohno, Mari Yamamoto, Yukiyasu Kashiwagi
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Patent number: 7713623Abstract: A process for producing a water-absorbent resin particle comprising subjecting a water-soluble ethylenically unsaturated monomer to a reverse phase suspension polymerization, characterized in that the process for producing a water-absorbent resin particle comprises the steps of (A) subjecting the water-soluble ethylenically unsaturated monomer to a first-step reverse phase suspension polymerization in a hydrocarbon-based solvent using a water-soluble radical polymerization initiator in the presence of a surfactant and/or a polymeric protective colloid, and optionally an internal crosslinking agent; (B) carrying out at least one step of the procedures of adding an aqueous solution of a water-soluble ethylenically unsaturated monomer containing a water-soluble radical polymerization initiator and optionally an internal crosslinking agent to a reaction mixture after the termination of the first-step reverse phase suspension polymerization in a state that the surfactant and/or the polymeric protective colloid isType: GrantFiled: March 12, 2004Date of Patent: May 11, 2010Assignee: Sumitomo Seika Chemicals Co., Ltd.Inventors: Kenya Matsuda, Yuji Kinpara, Tomoki Kawakita, Yasuhiro Nawata
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Publication number: 20070179261Abstract: A process for preparing a water-absorbent resin comprising carrying out a reversed phase suspension polymerization in multi-steps of at least two steps when the water-absorbent resin is prepared by subjecting a water-soluble ethylenically unsaturated monomer to the reversed phase suspension polymerization, said process for preparing a water-absorbent resin being characterized by adding a phosphorus-containing compound to at least one step in the second and subsequent steps, to carry out the polymerization reaction. The water-absorbent resin can be suitably used in hygienic materials such as disposable diaper, incontinence pad and sanitary napkin, especially in disposable diaper.Type: ApplicationFiled: December 20, 2004Publication date: August 2, 2007Inventors: Shinichi Uda, Tomoki Kawakita, Yasuhiro Nawata
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Publication number: 20070093766Abstract: An absorbent comprising a water-absorbent resin and a hydrophilic fiber, characterized in that the above-mentioned water-absorbent resin has a water absorption (a) of physiological saline of 60 to 100 g/g and a water-retaining capacity (b) of physiological saline of 45 to 80 g/g, and that the water absorption (a) of physiological saline and the water-retaining capacity (b) of physiological saline satisfy the relationship of the formula: [Water absorption (a) of physiological saline]?[Water-retaining capacity (b) of physiological saline]+15, and an absorbent article, wherein the above-mentioned absorbent is interposed between a liquid-permeable sheet and a liquid-impermeable sheet.Type: ApplicationFiled: June 9, 2004Publication date: April 26, 2007Applicant: SUMITOMO SEIKA CHEMICALS CO., LTD.Inventors: Kazuhiro Yoshino, Tomoki Kawakita, Yasuhiro Nawata
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Publication number: 20060194055Abstract: A process for producing a water-absorbent resin particle comprising subjecting a water-soluble ethylenically unsaturated monomer to a reverse phase suspension polymerization, characterized in that the process for producing a water-absorbent resin particle comprises the steps of (A) subjecting the water-soluble ethylenically unsaturated monomer to a first-step reverse phase suspension polymerization in a hydrocarbon-based solvent using a water-soluble radical polymerization initiator in the presence of a surfactant and/or a polymeric protective colloid, and optionally an internal crosslinking agent; (B) carrying out at least one step of the procedures of adding an aqueous solution of a water-soluble ethylenically unsaturated monomer containing a water-soluble radical polymerization initiator and optionally an internal crosslinking agent to a reaction mixture after the termination of the first-step reverse phase suspension polymerization in a state that the surfactant and/or the polymeric protective colloid isType: ApplicationFiled: March 12, 2004Publication date: August 31, 2006Inventors: Kenya Matsuda, Yuji Kinpara, Tomoki Kawakita, Yasuhiro Nawata
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Patent number: 6933356Abstract: Carboxyl group-containing polymer particles giving a neutralized viscous liquid being excellent in gel appearance and transparency. Carboxyl group-containing polymer particles comprising 55 to 94% by volume of water-swelled gel particles having a particle diameter of less than 50 ?m when the carboxyl group-containing polymer particles are dispersed and swelled in water in a concentration of 0.5% by weight, and 6 to 45% by volume of water-swelled gel particles having a particle diameter of at least 50 ?m when carboxyl group-containing polymer gel particles are dispersed and swelled in water in a concentration of 0.5% by weight.Type: GrantFiled: March 22, 2002Date of Patent: August 23, 2005Assignee: Sumitomo Seika Chemicals Co., Ltd.Inventors: Shigeki Hamamoto, Tomoki Kawakita, Masatoyo Yoshinaka
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Patent number: 6869994Abstract: A carboxyl group-containing polymer composition comprising 100 parts by weight of a carboxyl group-containing polymer (A) prepared by copolymerizing an ?,?-unsaturated carboxylic acid (a) with a compound (b) having at least two ethylenic unsaturated groups; and 0.01 to 20 parts by weight of at least one compound (B) selected from an ester (c) obtained from a polyhydric alcohol and a fatty acid, and an alkylene oxide adduct of an ester (d) obtained from a polyhydric alcohol and a fatty acid. Since the carboxyl group-containing polymer composition is excellent in the solubility in water and gives the aqueous solution excellent thickening property, the polymer composition can be suitably used as a thickener for various aqueous solutions.Type: GrantFiled: June 8, 2000Date of Patent: March 22, 2005Assignee: Sumitomo Seika Chemicals Co., Ltd.Inventors: Masato Fujikake, Shigeki Hamamoto, Tomoki Kawakita, Masatoyo Yoshinaka
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Publication number: 20040106757Abstract: Carboxyl group-containing polymer particles giving a neutralized viscous liquid being excellent in gel appearance and transparency. Carboxyl group-containing polymer particles comprising 55 to 94% by volume of water-swelled gel particles having a particle diameter of less than 50 &mgr;m when the carboxyl group-containing polymer particles are dispersed and swelled in water in a concentration of 0.5% by weight, and 6 to 45% by volume of water-swelled gel particles having a particle diameter of at least 50 &mgr;m when carboxyl group-containing polymer gel particles are dispersed and swelled in water in a concentration of 0.5% by weight.Type: ApplicationFiled: October 3, 2003Publication date: June 3, 2004Inventors: Shigeki Hamamoto, Tomoki Kawakita, Masatoyo Yoshinaka
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Patent number: 6599979Abstract: A polymer composition containing carboxyl group which is excellent in water solubility, thickening properties and flow characteristics. This composition comprises (A) a cross-linked polymer comprising (a) an &agr;,&bgr;-unsaturated carboxylic acid and (b) a compound having at least two ethylenically unsaturated groups, and (B) at least one polymer selected from among polymers comprising vinylpyrrolidone as an essential monomer and polyethylene oxide.Type: GrantFiled: November 15, 1999Date of Patent: July 29, 2003Assignee: Sumitomo Seika Chemicals Co., Ltd.Inventors: Masato Fujikake, Shinji Kobayashi, Shigeki Hamamoto, Mitsutaka Tabata, Tomoki Kawakita
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Publication number: 20020111436Abstract: A polymer composition containing carboxyl group which is excellent in water solubility, thickening properties and flow characteristics. This composition comprises (A) a crosslinked polymer comprising (a) an &agr;,&bgr;-unsaturated carboxylic acid and (b) a compound having at least two ethylenically unsaturated groups, and (B) at least one polymer selected from among polymers comprising vinylpyrrolidone as an essential monomer and polyethylene oxide.Type: ApplicationFiled: November 15, 1999Publication date: August 15, 2002Inventors: MASATO FUJIKAKE, SHINJI KOBAYASHI, SHIGEKI HAMAMOTO, MITSUTAKA TABATA, TOMOKI KAWAKITA
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Patent number: 6084032Abstract: A polymer composition containing carboxyl groups which has excellent water solubility, thickening properties and flow characteristics. The composition comprises (A) a crosslinked polymer comprising (a) an .alpha.,.beta.-unsaturated carboxylic acid and (b) a compound having at least two ethylenically unsaturated groups, and (B) at least one polymer comprising N-vinylpyrrolidone as essential monomer.Type: GrantFiled: April 22, 1998Date of Patent: July 4, 2000Assignee: Sumitomo Seika Chemicals Co., Ltd.Inventors: Masato Fujikake, Shinji Kobayashi, Shigeki Hamamoto, Mitsutaka Tabata, Tomoki Kawakita