Patents by Inventor Atsuhiko Katayama
Atsuhiko Katayama 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: 9051422Abstract: A water-soluble thermally polymerizable oxetane resin composition comprises (A) a water-soluble oxetane compound and (B) at least one heteropolyacid compound selected from heteropolyacids and heteropolyacid salts. The water-soluble oxetane compound may contain one or more oxetane functional groups in the molecule and one or more alcoholic OH groups in the molecule. The heteropolyacids include phosphotungstic acid, phosphomolybdic acid, silicotungstic acid, silicomolybdic acid or mixtures thereof. The heteropolyacid salts include phosphotungstic acid salts, phosphomolybdic acid salts, silicotungstic acid salts, silicomolybdic acid salts or mixtures thereof.Type: GrantFiled: September 13, 2007Date of Patent: June 9, 2015Assignee: NIPPON STEEL & SUMIKIN CHEMICAL CO., LTD.Inventors: Atsuhiko Katayama, Keiji Banno, Niranjan Kumar Shrestha, Toshihide Senzaki
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Patent number: 8344097Abstract: Disclosed is a cationically polymerizable composition which shows improved storage stability and whose polymerization initiation temperature or curing temperature is controlled. In the case where the composition is thermosetting, it yields a cured product of three-dimensional structure excellent in mechanical properties, electrical properties, adhesive properties, heat resistance, moisture resistance, chemical resistance, and the like. The cationically polymerizable composition comprises a cationically polymerizable compound selected from vinyl compounds, lactones, cyclic ethers, and the like, a heteropolyacid selected from phosphotungstic acid, phosphomolybdic acid, silicotungstic acid, silicomolybdic acid, and the like as a cationic polymerization initiator, and a stabilizer selected from heteropolyacid salts as an inhibitor of cationic polymerization.Type: GrantFiled: June 12, 2007Date of Patent: January 1, 2013Assignee: Nippon Steel Chemical Co., Ltd.Inventors: Atsuhiko Katayama, Niranjan Kumar Shrestha, Keiji Banno, Toshihide Senzaki
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Patent number: 8008429Abstract: Disclosed is a thermosetting resin composition of excellent low-temperature curability comprising an oxetane compound and also disclosed is a cured article obtained therefrom. The thermosetting resin composition comprises an oxetane compound (A) containing two or more oxetane functional groups in the molecule represented by the following general formula (1) and a heteropolyacid (B) as essential components. A cured article obtained by heat curing of this composition shows excellent mechanical properties, electrical properties, adhesive properties, resistance to heat, moisture, and chemicals, and the like. In formula (1), R1 is a hydrogen atom, alkyl group of 1 to 6 carbon atoms, fluorine atom, fluoroalkyl group of 1 to 6 carbon atoms, allyl group, aryl group, aralkyl group, furyl group, or thienyl group.Type: GrantFiled: August 23, 2006Date of Patent: August 30, 2011Assignee: Nippon Steel Chemical Co., Ltd.Inventors: Atsuhiko Katayama, Niranjan Kumar Shrestha
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Patent number: 7968874Abstract: Disclosed is an organic electroluminescent device (organic EL device) that utilizes phosphorescence and is improved in luminous efficiency and fully secured of driving stability. The organic EL device comprises an anode, an organic layer containing a hole-transporting layer, a light-emitting layer, and an electron-transporting layer, and a cathode piled one upon another on a substrate while the hole-transporting layer is disposed between the light-emitting layer and the anode and the electron-transporting layer is disposed between the light-emitting layer and the cathode. The light-emitting layer comprises an aluminum heterocomplex or dimeric complex of deuterated substituted or unsubstituted 2-methyl-8-hydroxyquinoline (Me8HQ-D) in which the hydrogen atoms in the methyl group of substituted or unsubstituted 2-methyl-8-hydroxyquinoline (Me8HQ) are deuterated as a host material and an organic metal complex containing at least one metal selected from groups 7 to 11 of the periodic table as a guest material.Type: GrantFiled: August 28, 2007Date of Patent: June 28, 2011Assignee: Nippon Steel Chemical Co., Ltd.Inventors: Hiroshi Miyazaki, Atsuhiko Katayama, Shinji Matsuo, Katsuhide Noguchi
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Publication number: 20100273941Abstract: Disclosed is a water-soluble, thermally polymerizable oxetane composition essentially comprising a water-soluble oxetane compound and a heteropolyacid. The water-soluble thermally polymerizable oxetane resin composition essentially comprises (A) a water-soluble oxetane compound and (B) at least one heteropolyacid compound selected from heteropolyacids and heteropolyacid salts. The water-soluble oxetane compound may contain one or more oxetane functional groups in the molecule and one or more alcoholic OH groups in the molecule. The heteropolyacids include phosphotungstic acid, phosphomolybdic acid, silicotungstic acid, and silicomolybdic acid and mixtures thereof. The heteropolyacid salts include phosphotungstic acid salts, phosphomolybdic acid salts, silicotungstic acid salts, and silicomolybdic acid salts and mixtures thereof.Type: ApplicationFiled: September 13, 2007Publication date: October 28, 2010Applicant: NIPPON STEEL CHEMICAL CO., LTD.Inventors: Atsuhiko Katayama, Keiji Banno, Niranja Kumar Shrestha, Toshihide Senzaki
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Publication number: 20100181553Abstract: Disclosed is an organic electroluminescent device (organic EL device) that utilizes phosphorescence and is improved in luminous efficiency and fully secured of driving stability. The organic EL device comprises an anode, an organic layer containing a hole-transporting layer, a light-emitting layer, and an electron-transporting layer, and a cathode piled one upon another on a substrate while the hole-transporting layer is disposed between the light-emitting layer and the anode and the electron-transporting layer is disposed between the light-emitting layer and the cathode. The light-emitting layer comprises an aluminum heterocomplex or dimeric complex of deuterated substituted or unsubstituted 2-methyl-8-hydroxyquinoline (Me8HQ-D) in which the hydrogen atoms in the methyl group of substituted or unsubstituted 2-methyl-8-hydroxyquinoline (Me8HQ) are deuterated as a host material and an organic metal complex containing at least one metal selected from groups 7 to 11 of the periodic table as a guest material.Type: ApplicationFiled: August 28, 2007Publication date: July 22, 2010Inventors: Hiroshi Miyazaki, Atsuhiko Katayama, Shinji Matsuo, Katsuhide Noguchi
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Publication number: 20100130697Abstract: Disclosed is a thermosetting resin composition of excellent low-temperature curability comprising an oxetane compound and also disclosed is a cured article obtained therefrom. The thermosetting resin composition comprises an oxetane compound (A) containing two or more oxetane functional groups in the molecule represented by the following general formula (1) and a heteropolyacid (B) as essential components. A cured article obtained by heat curing of this composition shows excellent mechanical properties, electrical properties, adhesive properties, resustance to heat, moisture, and chemicals, and the like. In formula (1), R1 is a hydrogen atom, alkyl group of 1 to 6 carbon atoms, fluorine atom, fluoroalkyl group of 1 to 6 carbon atoms, allyl group, aryl group, aralkyl group, furyl group, or thienyl group.Type: ApplicationFiled: August 23, 2006Publication date: May 27, 2010Inventors: Atsuhiko Katayama, Niranjan Kumar Shrestha
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Publication number: 20100081785Abstract: Disclosed is a cationically polymerizable composition which shows improved storage stability and whose polymerization initiation temperature or curing temperature is controlled. In the case where the composition is thermosetting, it yields a cured product of three-dimensional structure excellent in mechanical properties, electrical properties, adhesive properties, heat resistance, moisture resistance, chemical resistance, and the like. The cationically polymerizable composition comprises a cationically polymerizable compound selected from vinyl compounds, lactones, cyclic ethers, and the like, a heteropolyacid selected from phosphotungstic acid, phosphomolybdic acid, silicotungstic acid, silicomolybdic acid, and the like as a cationic polymerization initiator, and a stabilizer selected from heteropolyacid salts as an inhibitor of cationic polymerization.Type: ApplicationFiled: June 12, 2007Publication date: April 1, 2010Inventors: Atsuhiko Katayama, Niranjan Kumar Shrestha, Keiji Banno, Toshihide Senzaki
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Publication number: 20090059155Abstract: [Object] To implement a support layer which is smaller than in the prior art with a stable contact area with the spacers in columnar form even in the case where the spacers in columnar form are miniaturized.Type: ApplicationFiled: August 28, 2008Publication date: March 5, 2009Inventors: Takanori Nakayama, Atsuhiko Katayama
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Patent number: 7049389Abstract: This invention relates to a process for preparing high-purity aromatic oligomers by effectively separating an organic layer containing aromatic oligomers or the reaction products of a polycyclic aromatic compound with formaldehyde from an aqueous layer containing an acid catalyst in a simplified manner, hitherto regarded difficult to accomplish, and obtaining high-purity aromatic oligomers from the organic layer containing a reduced amount of impurities. In separating the aqueous layer containing the acid catalyst and the organic layer containing the oligomers from the reaction mixture formed by the condensation of a polycyclic aromatic compound and formaldehyde, the emulsion phase is broken by adding a nonionic or cationic surfactant in an effective amount and an alkali in an amount sufficient to neutralize 1–70% of the acid in the acid catalyst, the organic and aqueous layers are separated and the aromatic oligomers are recovered from the organic layer.Type: GrantFiled: December 26, 2002Date of Patent: May 23, 2006Assignee: Nippon Steel Chemical Co., Ltd.Inventors: Toshihide Senzaki, Takahiro Imamura, Kazuyoshi Horibe, Tomoaki Yoshida, Atsuhiko Katayama, Yasuo Wada, Katsuhide Noguchi
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Publication number: 20040266976Abstract: This invention relates to a process for preparing high-purity aromatic oligomers by effectively separating an organic layer containing aromatic oligomers or the reaction products of a polycyclic aromatic compound with formaldehyde from an aqueous layer containing an acid catalyst in a simplified manner, hitherto regarded difficult to accomplish, and obtaining high-purity aromatic oligomers from the organic layer containing a reduced amount of impurities. In separating the aqueous layer containing the acid catalyst and the organic layer containing the oligomers from the reaction mixture formed by the condensation of a polycyclic aromatic compound and formaldehyde, the emulsion phase is broken by adding a nonionic or cationic surfactant in an effective amount and an alkali in an amount sufficient to neutralize 1-70% of the acid in the acid catalyst, the organic and aqueous layers are separated and the aromatic oligomers are recovered from the organic layer.Type: ApplicationFiled: May 20, 2004Publication date: December 30, 2004Inventors: Toshihide Senzaki, Takahiro Imamura, Kazuyoshi Horibe, Tomoaki Yoshida, Atsuhiko Katayama, Yasuo Wada, Katsuhide Noguchi