Patents by Inventor Yoshitane Watanabe
Yoshitane Watanabe 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: 6713170Abstract: The present invention provides heat-curable or UV-curable transparent hard coating materials suitable for forming a low refractive antireflection coating on a substrate such as a film or sheet to reduce reflection of external light or increase light transmittance. A UV-curable or heat-curable transparent hard coating material comprising a UV-curable resin having one or more (meth)acryloyl groups in one molecule or a heat-curable resin and silica-magnesium fluoride hydrate composite colloidal particles such that the transparent film obtained by curing said transparent hard coating material has a refractive index of 1.48 or less.Type: GrantFiled: August 27, 2001Date of Patent: March 30, 2004Assignees: Nippon Kayaku Kabushiki Kaisha, Nissan Chemical Industries, Ltd.Inventors: Shoichi Kaneko, Takeshi Takahashi, Yoshitane Watanabe, Keitaro Suzuki, Osamu Tanegashima, Yoshinari Koyama
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Patent number: 6632489Abstract: A stable silica sol having an SiO2 concentration of 1 to 50% by weight and containing liquid-medium dispersed moniliform colloidal silica particles each having 3 or more as a ratio of D1/D2 of a particle diameter (D1 nm) measured by a dynamic light scattering method to a mean particle diameter (a particle diameter measured by a nitrogen absorption method: D2 nm) where D1 is 50 to 500 nm, and which are comprised by spherical colloidal silica particles having a mean particle diameter of 10 to 80 nm and metal oxide-containing silica bonding these spherical-colloidal silica particles, and in which the spherical colloidal silica particles link in rows in only one plane, process for producing such and a coating composition for ink receiving layers containing such a silica sol and an ink jet recording medium.Type: GrantFiled: February 28, 2001Date of Patent: October 14, 2003Assignee: Nissan Chemical Industries, Ltd.Inventors: Yoshitane Watanabe, Yoshiyuki Kashima, Kiyomi Ema, Yutaka Ohmori
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Patent number: 6537667Abstract: An electro-conductive oxide particle comprising indium atoms, antimony atoms and oxygen atoms in a molar ratio of Sb/In of from 0.03 to 0.08, having a primary particle diameter of from 2 to 300 nm, and having a crystal structure of indium oxide.Type: GrantFiled: November 20, 2001Date of Patent: March 25, 2003Assignee: Nissan Chemical Industries, Ltd.Inventors: Yoshitane Watanabe, Tadayuki Isaji, Osamu Fujimoto
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Publication number: 20020090513Abstract: An electro-conductive oxide particle comprising indium atoms, antimony atoms and oxygen atoms in a molar ratio of Sb/In of from 0.03 to 0.08, having a primary particle diameter of from 2 to 300 nm, and having a crystal structure of indium oxide.Type: ApplicationFiled: November 20, 2001Publication date: July 11, 2002Applicant: Nissan Chemical Industries, Ltd.Inventors: Yoshitane Watanabe, Tadayuki Isaji, Osamu Fujimoto
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Patent number: 6398827Abstract: The present invention relates to a polishing composition for polishing alumina disks, polishing substrates having silica surfaces and semiconductor wafers, comprising a stable aqueous silica sol containing moniliform colloidal silica particles having a ratio (D1/D2) of a particle diameter D1 nm (as measured by dynamic light scattering method) to a mean particle diameter D2 (as measured by nitrogen absorption method) of 3 or more, wherein D1 is between 50 to 800 nm and D2 is between 10 to 120 nm, said moniliform colloidal silica particles being composed of spherical colloidal silica particles and a metal oxide-containing silica bond which bonds these spherical colloidal silica particles together, wherein the spherical colloidal silica particles are linked together in rows in only one plane by observation through an electron microscope, and further wherein said polishing composition contains 0.5 to 50% by weight of said moniliform colloidal silica particles.Type: GrantFiled: June 29, 2000Date of Patent: June 4, 2002Assignee: Nissan Chemical Industries, LTD.Inventors: Isao Ota, Tohru Nishimura, Yoshitane Watanabe, Yoshiyuki Kashima, Kiyomi Ema, Yutaka Ohmori
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Patent number: 6296943Abstract: The present invention relates to a method for producing titanium oxide (TiO2)-tin oxide (SnO2) composite sol, a titanium oxide (TiO2)-zirconium oxide (ZrO2)-tin oxide (SnO2) composite sol, and a titanium oxide (TiO2)-cerium oxide (CeO2)-tin oxide (SnO2) composite sol. Further, the present invention relates to a coating composition containing any of the above-mentioned composite sols for forming coating films that are excellent in marring resistance, surface hardness, wearing resistance, transparency, heat resistance, light-resistant, weatherability, or water resistance on optical elements such as lenses for glasses and cameras, automotive windowpane, or optical filters attached to liquid-crystal displays, plasma displays, etc. and to optical elements having a cured film of the coating composition on the surfaces.Type: GrantFiled: September 1, 1999Date of Patent: October 2, 2001Assignee: Nissan Chemical Industries, Ltd.Inventors: Yoshitane Watanabe, Keitaro Suzuki, Yoshinari Koyama, Motoko Iijima
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Patent number: 6291535Abstract: A sol comprising silica-magnesium fluoride hydrate composite colloidal particles used in an anti-reflection coating material for forming an anti-reflection coating and a process for its preparation are provided. A sol comprising silica-magnesium fluoride hydrate composite colloidal particles having a ratio of silica to magnesium fluoride hydrate MgF2.nH2O, n being in the range between 0.25 and 0.5, in terms of a SiO2/MgF2 weight ratio of from 0.01 to 5 and a primary particle size of 5 to 50 nm. A process for the preparation of an aqueous sol comprising silica-magnesium fluoride hydrate composite colloidal particles which comprises the steps of adding an aqueous fluoride solution to a mixture liquid of a silica sol and an aqueous magnesium salt solution to produce a slurry of an agglomerate comprising silica-magnesium fluoride hydrate composite colloidal particles and removing the salts formed as by-products.Type: GrantFiled: December 7, 1999Date of Patent: September 18, 2001Assignee: Nissan Chemical Industries, Ltd.Inventors: Yoshitane Watanabe, Keitaro Suzuki, Osamu Tanegashima, Yoshinari Koyama
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Patent number: 6093749Abstract: An anhydrous zinc antimonate sol comprising a surface-modified anhydrous zinc antimonate colloid particles dispersed in a liquid, the surface-modified anhydrous zinc antimonate colloid particles comprising anhydrous zinc antimonate colloid particles as nuclei and a silicon-containing substance coating surfaces of the colloid particles, the sol containing an amine and/or an hydroxycarboxylic acid and a method for producing the same. The anhydrous zinc antimonate sol of the present invention is useful as transparent antistatic materials for resins, plastics, glasses, paper, and magnetic tapes, etc., transparent ultraviolet absorbents, transparent heat wave absorbents, high refractive index hard coating agents, antireflective agents, and the like.Type: GrantFiled: October 9, 1998Date of Patent: July 25, 2000Assignee: Nissan Chemical Industries, Ltd.Inventors: Yoshitane Watanabe, Osamu Tanegashima
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Patent number: 6040372Abstract: A sol having dispersed in a liquid medium particles of a hydrated zinc stannate having a primary particle diameter of from 2 to 200 nm and represented by the formula xZnO.multidot.ySnO.sub.2 .multidot.zH.sub.2 O wherein the molar ratio of x:y:z is 1:0.83 to 1.43:1.00 to 5.00.Type: GrantFiled: August 28, 1998Date of Patent: March 21, 2000Assignee: Nissan Chemical Industries, Ltd.Inventors: Yoshitane Watanabe, Keitaro Suzuki, Yoshinari Koyama, Motoko Iijima
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Patent number: 6001164Abstract: A sol having dispersed in a liquid medium particles of a hydrated zinc stannate having a primary particle diameter of from 2 to 200 nm and represented by the formula xZnO.ySnO.sub.2.zH.sub.2 O wherein the molar ratio of x:y:z is 1:0.83 to 1.43:1.00 to 5.00.Type: GrantFiled: August 25, 1998Date of Patent: December 14, 1999Assignee: Nissan Chemical Industries, Ltd.Inventors: Yoshitane Watanabe, Keitaro Suzuki, Yoshinari Koyama, Motoko Iijima
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Patent number: 5998090Abstract: A high optical density, i.e., .gtoreq.3.0, at 1 micron or less film thickness, black matrix is disclosed having improved stability and shelf life as a consequence of admixing Pigment Black 7 and organic dye or dye mixtures on a polyimide polymer vehicle.Type: GrantFiled: December 1, 1997Date of Patent: December 7, 1999Assignees: Brewer Science, Inc., Nissan Chemical Industries, Ltd.Inventors: Ram W. Sabnis, Terry L. Brewer, Robert E. Nichols, Edith G. Hays, Michael D. Stroder, Akira Yanagimoto, Yasuhisa Sone, Yoshitane Watanabe, Kiyomi Ema
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Patent number: 5989515Abstract: A process for producing a stable acidic aqueous alumina sol containing 50 to 300 nm of elongate secondary particles which are elongated in only one plane and formed by edge-to-edge coagulation of rectangular plate-like primary particles having a length of one side of 10 to 30 nm when observed through an electron microscope, the process comprises the steps of:(A) adding an alkali to an aqueous alumina sol containing fibrous colloidal particles of an amorphous alumina hydrate to produce a reaction mixture having a pH of 9 to 12,(B) subjecting the reaction mixture obtained in the step (A) to a hydrothermal treatment at a temperature of 110 to 250.degree. C. to produce an aqueous suspension containing an alumina hydrate having a boehmite structure, and(C) desalting the aqueous suspension obtained in the step (B) by adding water and an acid by ultrafiltration to form an acidic aqueous alumina sol having a pH of 3 to 6.Type: GrantFiled: July 18, 1997Date of Patent: November 23, 1999Assignee: Nissan Chemical Industries, Ltd.Inventors: Yoshitane Watanabe, Yoshiyuki Kashima, Kiyomi Ema
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Patent number: 5989391Abstract: A product obtained by reacting a sulfonated amino resin and an amino group-containing substance in a weight ratio of from 1:0.05 to 1:3.Type: GrantFiled: October 27, 1997Date of Patent: November 23, 1999Assignee: Nissan Chemical Industries, Ltd.Inventors: Yoshitane Watanabe, Kiyomi Ema, Takaichi Sugiyama, Hisanobu Urahata, Michie Kaneko
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Patent number: 5906679Abstract: The invention relates to coating compositions employing zinc antimonate anhydride comprising zinc antimonate anhydride particles and a liquid of a part-hydrolyzed silane coupling agent, a liquid of hydrolyzed ethylsilicate, a liquid of hydrolyzed methylsilicate, or a resin emulsion. The zinc antimonate anhydride particle having a ZnO/Sb.sub.2 O.sub.5 molar ratio in a range of from 0.8 to 1.2, a crystal structure of zinc antimonate anhydride (Zn Sb.sub.2 0.sub.5), and a primary particle size in a range of from 5 to 500 nm. The particle production method comprises the steps of mixing a zinc compound with a colloidal antimony oxide at a ZnO/Sb.sub.2 O.sub.5 molar rate in a range of from 0.8 to 1.2, followed by calcining the mixture within a temperature range of from 500 to 1100.degree. C. The particles are applicable as a flame retardant for plastics, a smoke suppressant, antistatic agent for plastics and glasses, and resistor.Type: GrantFiled: September 29, 1997Date of Patent: May 25, 1999Assignee: Nissan Chemical Industries, Ltd.Inventors: Yoshitane Watanabe, Keitaro Suzuki, Yoshinari Koyama
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Patent number: 5891565Abstract: A sol comprising colloidal particles of sodium magnesium fluoride (NaF.MgF.sub.2) having an average particle diameter of from 10 to 100 nm.Type: GrantFiled: January 21, 1997Date of Patent: April 6, 1999Assignee: Nissan Chemical Industries Ltd.Inventors: Yoshitane Watanabe, Keitaro Suzuki, Yoshinari Koyama, Motoko Iijima
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Patent number: 5891362Abstract: A sol having dispersed in a liquid medium particles of a hydrated zinc stannate having a primary particle diameter of from 2 to 200 nm and represented by the formula xZnO.ySnO.sub.2.zH.sub.2 O wherein the molar ratio of x:y:z is 1:0.83 to 1.43:1.00 to 5.00.Type: GrantFiled: June 6, 1996Date of Patent: April 6, 1999Assignee: Nissan Chemical Industries, Ltd.Inventors: Yoshitane Watanabe, Keitaro Suzuki, Yoshinari Koyama, Motoko Iijima
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Patent number: 5861112Abstract: An electro-conductive oxide particle comprising indium atoms, antimony atoms and oxygen atoms in a molar ratio of In:Sb:O being 1:0.02-1.25:1.55-4.63 and having a primary particle diameter of from 5 to 500 nm.Type: GrantFiled: November 24, 1997Date of Patent: January 19, 1999Assignee: Nissan Chemical Industries, Ltd.Inventors: Yoshitane Watanabe, Keitaro Suzuki, Motoko Iijima
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Patent number: 5780201Abstract: An organic black matrix having high resistivity (.gtoreq.10.sup.11 ohm/square), high optical density (.gtoreq.2.0) at ultra thin film thicknesses (.ltoreq.1.0 microns) for improved STN and TFT pixel display applications is made possible by combining polyimide/dye solutions and mixed metal oxide pigment dispersions at a weight/weight ratio of dye to pigment of 1:15 to 3:15. The need for low resistivity carbon black, as a replacement for sputtered chrome, is negated.Type: GrantFiled: September 27, 1996Date of Patent: July 14, 1998Assignees: Brewer Science, Inc., Nissan Chemical Industries, Ltd.Inventors: Ram W. Sabnis, Jonathan W. Mayo, Edith G. Hays, Terry L. Brewer, Michael D. Stroder, Akira Yanagimoto, Yasuhisa Sone, Yoshitane Watanabe, Kiyomi Ema
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Patent number: 5766512Abstract: The object of the invention is to provide a zinc antimonate anhydride and a production method thereof. The invention relates to a particle having a ZnO/Sb.sub.2 O.sub.5 molar ratio in a range of from 0.8 to 1.2, a crystal structure of zinc antimonate anhydride (Znsb.sub.2 O.sub.6), and a primary particle size in a range of from 5 to 500 nm. The production method of these particles comprises the steps of mixing a zinc compound with a colloidal antimony oxide at a ZnO/Sb.sub.2 O.sub.5 molar rate in a range of from 0.8 to 1.2, followed by calcining the mixture within a temperature range of from 500.degree. to 1100.degree. C. The particles of this invention are applicable as a flame retardant for plastics, a smoke suppressant, antistatic agent for plastics and glasses, and resistor.Type: GrantFiled: December 3, 1996Date of Patent: June 16, 1998Assignee: Nissan Chemical Industries, Ltd.Inventors: Yoshitane Watanabe, Keitaro Suzuki, Yoshinari Koyama
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Patent number: 5756009Abstract: An electro-conductive oxide particle comprising indium atoms, antimony atoms and oxygen atoms in a molar ratio of In:Sb:O being 1:0.02-1.25:1.55-4.63 and having a primary particle diameter of from 5 to 500 nm.Type: GrantFiled: March 14, 1996Date of Patent: May 26, 1998Assignee: Nissan Chemical Industries, Ltd.Inventors: Yoshitane Watanabe, Keitaro Suzuki, Motoko Iijima