Patents by Inventor Yoshiaki Sakatani
Yoshiaki Sakatani 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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Publication number: 20090093361Abstract: To provide a photocatalyst dispersion liquid obtained by dispersing titanium oxide photocatalyst particles and tungsten oxide photocatalyst particles in a dispersion medium, where the surfaces of both titanium oxide photocatalyst particles and tungsten oxide photocatalyst particles are charged positively or negatively. In the photocatalyst dispersion liquid, the titanium oxide photocatalyst particles and the tungsten oxide photocatalyst particles, which are dispersed in the dispersion medium, are not aggregated easily, and a solid-liquid separation is not generated.Type: ApplicationFiled: October 7, 2008Publication date: April 9, 2009Applicant: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Yoshiaki SAKATANI, Kensen OKUSAKO, Makoto MURATA
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Publication number: 20080241542Abstract: To provide a tungsten oxide photocatalyst which shows a high photocatalytic activity by irradiating with visible light even under the environment where ultraviolet light is not irradiated, the tungsten oxide photocatalyst has tungsten oxide particles and Pt particles having a primary particle size of 3 to 20 nm supported on the surface of the tungsten oxide particles in an amount of 0.03 to 5 parts by weight based on 100 parts by weight of the tungsten oxide particles.Type: ApplicationFiled: March 28, 2008Publication date: October 2, 2008Applicants: NATIONAL UNIVERSITY COPORATION HOKKAIDO UNIVERSITY, SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Bunsho OHTANI, Ryu ABE, Yoshiaki SAKATANI, Makoto MURATA, Hiroaki NISHIMINE
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Patent number: 7045005Abstract: A ceramics dispersion liquid is provided. The dispersion liquid may form an applied film easily recovering hydrophilic properties with light irradiation even when contaminated by lipophilic materials. The ceramics dispersion liquid comprises a ceramics, a dispersion medium, and at least one compound selected from a carboxylic acid, an ammonium carboxylate, a salt of carboxylic acid with metal selected from Ia group, IIa group, IIIa group, Va group, VIa group, VIIa group, VIII group, Ib group, IIb group, IIIb group, IVb group and lanthanoid group, and a salt of oxalic acid with metal selected from IVa group.Type: GrantFiled: July 15, 2002Date of Patent: May 16, 2006Assignee: Sumitomo Chemical Company, LimitedInventors: Yoshiaki Sakatani, Hironobu Koike, Hiroyuki Ando
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Patent number: 7011808Abstract: A titanium oxide showing sufficiently high photocatalytic activities by irradiation of visible light is provided. Using the titanium oxide, an excellent photocatalyst and photocatalyst coating composition are also provided. The titanium oxide has a selected ion chromatogram in which an evolution gas having 28 of a ratio of mass number to electric charge quantity exhibits at least one peak at about 600° C. or higher, the selected ion chromatogram being measured in a thermogravimetry-mass-spectroscopy.Type: GrantFiled: July 11, 2001Date of Patent: March 14, 2006Assignee: Sumitomo Chemical Company, LimitedInventors: Yoshiaki Sakatani, Hiroyuki Ando, Hironobu Koike
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Patent number: 6974611Abstract: A titanium oxide dispersion composition is provides, the composition comprising a solvent and a titanium oxide with an average secondary particle diameter of 100 nm or smaller, the dispersion composition having a maximum intensity within the range of from 435 nm to 700 nm of a primary differential spectrum of a transmittance spectrum, wherein the transmittance spectrum is measured using an ultraviolet-visible spectrophotometer after adjusting a solid content of the dispersion composition to be about 2% by weight. The composition provides a film having a high hydrophilicity under the irradiation of a visible light.Type: GrantFiled: June 9, 2003Date of Patent: December 13, 2005Assignee: Sumitomo Chemical Company, LimitedInventors: Yoshiaki Sakatani, Kensen Okusako, Hironobu Koike
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Publication number: 20050233893Abstract: A photocatalytic coating composition comprising a photocatalyst, a silicon alkoxide, a zirconium compound, colloidal silica, and a liquid medium, wherein a content of the zirconium compound in terms of zirconium atoms is 0.3 to 3 times by mole a content of the silicon alkoxide in terms of silicon atoms, which can form a coating film of a photocatalyst with a high adhesion strength to a substrate.Type: ApplicationFiled: March 16, 2005Publication date: October 20, 2005Inventors: Yoshiaki Sakatani, Seiichi Sakaguchi
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Patent number: 6884753Abstract: The present invention provides a method for producing a ceramic dispersion composition, the method comprising the step of heating a mixture of a ceramic powder having a photocatalytic activity, a dispersant and a solvent at a temperature of about 70° C. or higher without substantially letting the solvent out of the reaction system. The ceramic dispersion composition can be used for providing a film showing a high hydrophilicity by light irradiation.Type: GrantFiled: May 16, 2003Date of Patent: April 26, 2005Assignee: Sumitomo Chemical Company, LimitedInventors: Yoshiaki Sakatani, Kensen Okusako, Hironobu Koike
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Patent number: 6830741Abstract: A titanium oxide showing sufficiently high photocatalytic activities by irradiation of visible light is provided. Using the titanium oxide, an excellent photocatalyst and photocatalyst coating composition is also provided. The titanium oxide has (i) three or more peaks within the range of from 1.930 to 2.030 in g value of electron spin resonance spectrum of the titanium oxide, wherein the largest one of the peaks is within the range of from 1.990 to 2.020 in the g value and/or (ii) a spin concentration X of 1.50×1016 spins/g or more, which is determined from electron spin resonance spectrum of the titanium oxide measured after irradiation of visible light.Type: GrantFiled: October 27, 2000Date of Patent: December 14, 2004Assignee: Sumitomo Chemical Company, LimitedInventors: Yoshiaki Sakatani, Hiroyuki Ando, Hironobu Koike
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Patent number: 6827922Abstract: A process for producing a titanium oxide is provided which comprises (i) a step of calcining a titanium compound in the presence of ammonia gas or (ii) steps of treating a titanium compound with heat in the presence of ammonia gas and calcining the heat-treated titanium compound. The titanium oxide obtained in the present invention exhibits a sufficiently high photocatalytic activity by irradiation of visible light.Type: GrantFiled: March 29, 2001Date of Patent: December 7, 2004Assignee: Sumitomo Chemical Company, LimitedInventors: Yoshinari Sawabe, Yoshiaki Sakatani, Hironobu Koike
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Publication number: 20040151662Abstract: A titanium oxide showing photocatalytic activity and having a narrow particle diameter distribution can be produced by a method comprising the steps of (i) inertly heating to a temperature of at least about 60° C., a composition comprising a titanium compound and a solvent; (ii) reacting the titanium compound with a base at a temperature of at least about 60° C.; and (iii) calcining the reaction product.Type: ApplicationFiled: January 22, 2004Publication date: August 5, 2004Applicant: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Yuko Yoshida, Yoshiaki Sakatani
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Patent number: 6726891Abstract: A process for producing a titanium oxide is provided which comprises the steps of (i) reacting a titanium compound with ammonia in an amount exceeding the stoichiometric amount necessary to convert the titanium compound to a titanium hydroxide or reacting a titanium compound with a base at pH of from about 2 to about 7, to obtain a reaction product and (ii) calcining the obtained product. The titanium oxide exhibits a high photocatalytic activity by visible light radiation.Type: GrantFiled: March 29, 2001Date of Patent: April 27, 2004Assignee: Sumitomo Chemical Company, LimitedInventors: Yoshiaki Sakatani, Hironobu Koike
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Publication number: 20040067193Abstract: A titanium oxide particle showing high photocatalytic activity with a small particle size can be efficiently produced in a method which comprises the steps of (1) mixing together or sequentially a titanium compound, a base and a foaming agent, wherein the hydroxyl group provided by the base is in a molar amount of about 2.1 times to about 3 times of the titanium atom in the titanium compound; and (2) calcining a solid resulting from said mixing together or sequentially of said titanium compound, said base and said foaming agent.Type: ApplicationFiled: September 22, 2003Publication date: April 8, 2004Applicant: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Yoshiaki Sakatani, Kensen Okusako, Hironobu Koike
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Publication number: 20040037772Abstract: A process for producing a titanium oxide is provided which comprises (i) a step of calcining a titanium compound in the presence of ammonia gas or (ii) steps of treating a titanium compound with heat in the presence of ammonia gas and calcining the heat-treated titanium compound. The titanium oxide obtained in the present invention exhibits a sufficiently high photocatalytic activity by irradiation of visible light.Type: ApplicationFiled: June 26, 2003Publication date: February 26, 2004Applicant: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Yoshinari Sawabe, Yoshiaki Sakatani, Hironobu Koike
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Patent number: 6673331Abstract: A titanium hydroxide is provided which can be utilized for producing a photocatalyst exhibiting a superior photocatalytic activity by irradiation of visible light. The titanium hydroxide has a primary differential spectrum (of radial structure function in connection with titanium K absorption edge) having maximal intensities (U1 and U2) and minimal intensities (L1 and L2) at interatomic distances in the range of from 1.4 Å to 2.8 Å, the maximal intensities being at an interatomic distance of from 1.4 Å to 1.7 Å and of from 2.2 Å to 2.5 Å and the minimal intensities being at an interatomic distance of from 1.9 Å to 2.2 Å and of from 2.5 Å to 2.8 Å; and index X calculated by the equation X=(U2−L2)/(U1−L1) of about 0.06 or more.Type: GrantFiled: December 21, 2001Date of Patent: January 6, 2004Assignee: Sumitomo Chemical Company, LimitedInventors: Yoshiaki Sakatani, Hiroyuki Ando, Hironobu Koike
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Publication number: 20030236317Abstract: A titanium oxide dispersion composition is provides, the composition comprising a solvent and a titanium oxide with an average secondary particle diameter of 100 nm or smaller, the dispersion composition having a maximum intensity within the range of from 435 nm to 700 nm of a primary differential spectrum of a transmittance spectrum, wherein the transmittance spectrum is measured using an ultraviolet-visible spectrophotometer after adjusting a solid content of the dispersion composition to be about 2% by weight. The composition provides a film having a high hydrophilicity under the irradiation of a visible light.Type: ApplicationFiled: June 9, 2003Publication date: December 25, 2003Applicant: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Yoshiaki Sakatani, Kensen Okusako, Hironobu Koike
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Publication number: 20030220194Abstract: The present invention provides a method for producing a ceramic dispersion composition, the method comprising the step of heating a mixture of a ceramic powder having a photocatalytic activity, a dispersant and a solvent at a temperature of about 70° C. or higher without substantially letting the solvent out of the reaction system. The ceramic dispersion composition can be used for providing a film showing a high hydrophilicity by light irradiation.Type: ApplicationFiled: May 16, 2003Publication date: November 27, 2003Applicant: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Yoshiaki Sakatani, Kensen Okusako, Hironobu Koike
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Patent number: 6645460Abstract: There is provided a titanium hydroxide having a nitrogen content of 2.3% by weight or more in terms of nitrogen atom based on the titanium hydroxide and/or having a nitrogen content of about 3.3% by weight or more in terms of nitrogen atom based on the titanium oxide obtained after calcining the titanium hydroxide in air at about 400° C. The titanium hydroxide may be utilized as a raw material for producing a photocatalyst which exhibits a superior photocatalytic activity by irradiation of visible light.Type: GrantFiled: March 29, 2001Date of Patent: November 11, 2003Assignee: Sumitomo Chemical Company, LimitedInventors: Yoshiaki Sakatani, Hironobu Koike, Hiroyuki Ando
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Patent number: 6627579Abstract: Titanium oxide exhibiting a superior photocatalytic activity through irradiation of a visible light as well as an ultraviolet light, and a photocatalyst and a photocatalytic coating agent including said titanium oxide, wherein said titanium oxide has a value of an index X1 calculated by the following equation (I) of not more than about 0.90, and a value of an index Y1 calculated by the following equation (II) of not less than 0.Type: GrantFiled: June 13, 2000Date of Patent: September 30, 2003Assignee: Sumitomo Chemical Company, LimitedInventors: Yoshiaki Sakatani, Hironobu Koike, Yoshiaki Takeuchi
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Publication number: 20030162658Abstract: A titanium oxide showing sufficiently high photocatalytic activities by irradiation of visible light is provided. The titanium oxide contains an element selected from IIa group elements, IIb group elements and lantanoids, and has (i) an X-ray photoelectron spectrum (XPS) which has a peak at a binding energy within the range of from 458 eV to 460 eV and (ii) index X (=B/A) of about 0.98 or less, wherein A and B stand for half-widths of peaks at binding energies in 458-460 eV in the integrated spectra obtained by integrating the first and second XPS spectra and the seventh and eighth XPS spectra, respectively, which are obtained from eight-time XPS measurements of the titanium oxide.Type: ApplicationFiled: December 19, 2002Publication date: August 28, 2003Applicant: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Kazunari Domen, Yoshiaki Sakatani
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Publication number: 20030068268Abstract: A process for producing a titanium oxide is provided which comprises the steps of (i) reacting a titanium compound with ammonia in an amount exceeding the stoichiometric amount necessary to convert the titanium compound to a titanium hydroxide or reacting a titanium compound with a base at pH of from about 2 to about 7, to obtain a reaction product and (ii) calcining the obtained product. The titanium oxide exhibits a high photocatalytic activity by visible light radiation.Type: ApplicationFiled: March 29, 2001Publication date: April 10, 2003Inventors: Yoshiaki Sakatani, Hironobu Koike