Patents Assigned to Sakura Color Products Corporation
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Publication number: 20110000786Abstract: The subject invention provides a method which enables easy and efficient production of fine electret fine particles without the conventional pulverization or screening process. The method of producing electret fine particles comprises emulsifying a fluorine-containing compound in the liquid phase under atmospheric or elevated pressure in a liquid incompatible with the fluorine-containing compound, to obtain emulsified particles, and irradiating the emulsified particles with an electron ray or a radial ray.Type: ApplicationFiled: March 5, 2010Publication date: January 6, 2011Applicant: SAKURA COLOR PRODUCTS CORPORATIONInventors: Hiroshi Inoue, Masahiro Okuda
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Publication number: 20100275813Abstract: The invention provides a discolorable ink composition which is irreversibly erasable by heating to about 40° C. to 120° C. A discolorable ink composition, where an electron-donating color-forming organic compound and an electron-accepting compound are incorporated in wax particles, whereby the electron-donating color-forming compound in a state color-developed by the electron-accepting compound is separated from a decolorizer and kept in the color-developed state, while when the wax is liquefied by heating, the decolorizer reacts with the electron-accepting compound to convert the electron-donating color-forming organic compound into a decolorized state.Type: ApplicationFiled: November 10, 2008Publication date: November 4, 2010Applicant: SAKURA COLOR PRODUCTS CORPORATIONInventors: Norimasa Kurihara, Hiroshi Inoue
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Publication number: 20100273914Abstract: The invention provides a crayon which comprises an alternative plasticizer in place of the conventional phthalate ester plasticizers and yet provides writings excellent in water resistance, the crayon comprising a colorant, a gelling agent, an organic solvent, a resin component, and a plasticizer, wherein the plasticizer is at least one selected from diisononyl adipate, acetyltributyl citrate, 1,2-cyclohexanedicarboxylic acid diisononyl, and alkylsulfonic acid phenyl ester and is contained in an amount of 1 to 20% by weight based on the crayon.Type: ApplicationFiled: July 9, 2008Publication date: October 28, 2010Applicant: SAKURA COLOR PRODUCTS CORPORATIONInventors: Kotaro Sumitomo, Masamitsu Takahashi, Hidetoshi Fukuo
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Patent number: 7776941Abstract: An oil-based ink composition for writing instruments is provided that is capable of improving storage stability of an ink, while maintaining a leveling property even when a soluble gelling agent is used. The oil-based ink composition for writing instruments comprises a colorant, a resin, an organic solvent and a gelling agent, wherein said organic solvent(s) is (are) hydrocarbons solvent(s), and in particular, at least one species of the solvent selected from the group of aliphatic hydrocarbons solvent(s), alicyclic hydrocarbons solvent(s), aromatic hydrocarbons solvent(s), and halogenetad hydrocarbons solvent(s), said gelling agent(s) comprises (comprise) soluble gelling agent(s) soluble to the above organic solvent(s) and insoluble gelling agent(s) insoluble to the above organic solvent(s), and the above insoluble gelling agent(s) is (are) urea-modified thixotropic agent(s).Type: GrantFiled: May 23, 2006Date of Patent: August 17, 2010Assignee: Sakura Color Products CorporationInventors: Shigeki Yoneda, Takeshi Omatsu
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Patent number: 7721402Abstract: A method for producing a tip unit for a liquid applicator including: a first process of shaping the contour of a tip body in the form of a truncated conical surface; a second process of forming a ball housing having an open end at its distal end in the tip body; a third process of placing a ball into the ball housing; a fourth process of scraping the peripheral side of the distal end portion of the tip body to form a peripherally scraped portion after the first process; and a fifth process of deforming the peripherally scraped distal end portion of the tip body toward the ball.Type: GrantFiled: May 26, 2004Date of Patent: May 25, 2010Assignee: Sakura Color Products CorporationInventors: Hiroshi Inoue, Norimasa Kurihara, Shoko Matsumoto, Kyoko Sano, Takeshi Omatsu, Shigeki Yoneda, Yasunori Nakatani, Hiroyoshi Yamamoto, Kozaburo Fujita
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Publication number: 20100119410Abstract: An indicator for the detection of hydrogen peroxide. It undergoes a color change according to the concentration of hydrogen peroxide and this color change can be visually recognized with higher certainty. An ink composition for hydrogen peroxide detection is provided which comprises 1) at least one of styrene-acrylic resins and styrene-maleic acid resins and 2) a methine dye. A color change layer formed from the ink composition for hydrogen peroxide detection produces an effect that a color change according to, e.g., the concentration of hydrogen peroxide can be visually recognized.Type: ApplicationFiled: August 1, 2006Publication date: May 13, 2010Applicant: SAKURA COLOR PRODUCTS CORPORATIONInventors: Norihiro Yamaguchi, Kyoko Sano
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Publication number: 20100016471Abstract: The invention provides a process for producing a crayon having a desired hardness stably without poor gelation using a benzylidene sorbitol gelling agent together with the use of carbon black as a black pigment. The process comprises: dissolving and dispersing a resin component, carbon black having a pH of less than 5.0 and an organic amine in an organic solvent, dissolving at least one gelling agent selected from the group consisting of dibenzylidene sorbitol, tribenzylidene sorbitol and derivatives thereof in the resultant under heating to prepare a raw material solution, pouring the raw material solution into a molding container, and cooling and gelling the raw material solution.Type: ApplicationFiled: August 29, 2007Publication date: January 21, 2010Applicant: Sakura Color Products CorporationInventors: Kotaro Sumitomo, Masamitsu Takahashi, Hidetoshi Fukuo
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Publication number: 20090326096Abstract: The invention provides a process for producing a crayon having a desired hardness stably without poor gelation using a benzylidene sorbitol gelling agent together with the use of carbon black as a black pigment. The process comprises: dissolving and dispersing a resin component and carbon black having a pH of not less than 5.0 in an organic solvent, dissolving at least one gelling agent selected from the group consisting of dibenzylidene sorbitol, tribenzylidene sorbitol and derivatives thereof in the resultant under heating to prepare a raw material solution, pouring the raw material solution into a molding container, and cooling and gelling the raw material solution.Type: ApplicationFiled: August 29, 2007Publication date: December 31, 2009Applicant: Sakura Color Products CorporationInventors: Kotaro Sumitomo, Masamitsu Takahashi, Hidetoshi Fukuo
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Patent number: 7637680Abstract: A coating tool that includes an ink containment tube, an oily ink and a backflow inhibiting material. The ink is in contact with the inhibiting material. The ink containment tube has a boundary which is in contact with the oily ink and the backflow inhibiting material. The boundary contains polyvinyl alcohol and fluorine-based surfactants, the oily ink contains a colorant, a resin, an organic solvent, and a gelling agent, and the backflow inhibiting material consists of base material components and a gelling agent which contains polyacrylic acid, the polyacrylic acid being present in an amount of 0.1 to 3 wt % with respect to the total amount of said backflow inhibiting material.Type: GrantFiled: November 4, 2004Date of Patent: December 29, 2009Assignee: Sakura Color Products CorporationInventors: Shigeki Yoneda, Takeshi Omatsu
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Publication number: 20090234069Abstract: An oil-based ink composition for writing instruments is provided that is capable of improving storage stability of an ink, while maintaining a leveling property even when a soluble gelling agent is used. The oil-based ink composition for writing instruments comprises a colorant, a resin, an organic solvent and a gelling agent, wherein said organic solvent(s) is (are) hydrocarbons solvent(s), and in particular, at least one species of the solvent selected from the group of aliphatic hydrocarbons solvent(s), alicyclic hydrocarbons solvent(s), aromatic hydrocarbons solvent(s), and halogenetad hydrocarbons solvent(s), said gelling agent(s) comprises (comprise) soluble gelling agent(s) soluble to the above organic solvent(s) and insoluble gelling agent(s) insoluble to the above organic solvent(s), and the above insoluble gelling agent(s) is (are) urea-modified thixotropic agent(s).Type: ApplicationFiled: May 23, 2006Publication date: September 17, 2009Applicant: SAKURA COLOR PRODUCTS CORPORATIONInventors: Shigeki P. Yoneda, Takeshi Omatsu
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Patent number: 7588383Abstract: A mechanical pencil includes an advancing mechanism and a slider both incorporated in a main body. The advancing mechanism has a chuck and a chuck ring (collar for fastening the chuck) for holding a lead, so as to advance the lead. The slider is slidable relative to the main body and has a lead guide and a lead friction member. The lead friction member is to friction with the lead and is made of thermoplastic elastomer.Type: GrantFiled: May 11, 2006Date of Patent: September 15, 2009Assignee: Sakura Color Products CorporationInventors: Shunsuke Hokimoto, Nobuaki Kobayashi
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Publication number: 20090209678Abstract: The invention provides a crayon having excellent feel when writing while having high gel hardness. The crayon comprises a colorant, a gelling agent, an organic solvent and a resin component, wherein the gelling agent is at least one selected from the group consisting of dibenzylidene sorbitol, tribenzylidene sorbitol and derivatives thereof, and the resin component comprises a combination of polyvinyl butyral resin having an average degree of polymerization of less than 350 and polyvinyl butyral resin having an average degree of polymerization of 350 or more.Type: ApplicationFiled: July 9, 2007Publication date: August 20, 2009Applicant: SAKURA COLOR PRODUCTS CORPORATIONInventors: Kotaro Sumitomo, Masamitsu Takahashi, Hidetoshi Fukuo
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Patent number: 7541394Abstract: A water base pigment ink composition for inner lead type writing instruments do not comprise white colored inorganic pigments or white colored resin particles as coloring materials and the content of pigment is 0.5 to 7 wt %, the content of water-soluble resin is 2 to 10 wt % with respect to the total amount of the ink, and the viscosity is 3.5 to 10 mPa·s.Type: GrantFiled: December 26, 2003Date of Patent: June 2, 2009Assignee: Sakura Color Products CorporationInventors: Kazuhiro Kawauchi, Takeshi Omatsu
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Patent number: 7538148Abstract: The ink of the present invention comprises at least a three-dimensional film-forming component and water, comprises an adhesive synthetic resin emulsion as said three-dimensional film-forming component, and comprises at least 30% by weight of said adhesive synthetic resin emulsion on the basis of the solid content with respect to the total amount of the ink, and minimum film-forming temperature (MFT) of said adhesive synthetic resin emulsion is not greater than 25° C. and further, said ink comprises 1 to 3% by weight of a film-forming assistant with respect to the total amount of the ink.Type: GrantFiled: May 26, 2004Date of Patent: May 26, 2009Assignee: Sakura Color Products CorporationInventors: Hiroshi Inoue, Norimasa Kurihara, Shoko Matsumoto, Kyoko Sano, Takeshi Omatsu, Shigeki Yoneda, Yasunori Nakatani, Hiroyoshi Yamamoto, Kozaburo Fujita
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Patent number: 7485406Abstract: The invention provides a photostorage solid drawing medium comprising a solvent, a resin soluble in the solvent, a photostorage pigment and a gelling agent, wherein the photostorage pigment comprises a long afterglow fluorescent substance comprising an alkaline earth aluminosilicate as a matrix activated with a rare earth element wherein the alkaline earth element is at least one selected from the group consisting of strontium, calcium, magnesium and barium. The solvent used is a polar solvent, particularly a mixture of water and a water-soluble organic solvent, or at least one alcoholic solvent selected from the group consisting of glycols, glycol ethers, glycol ether esters and monovalent alcohols.Type: GrantFiled: April 7, 2006Date of Patent: February 3, 2009Assignee: Sakura Color Products CorporationInventors: Hidetoshi Fukuo, Masamitsu Takahashi, Kotaro Sumitomo
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Patent number: 7468400Abstract: The glittering ink composition of the present invention contains a glass flake pigment, a water-soluble resin, a water-soluble organic solvent and water as essential ingredients. The content of the glass flake pigment is 0.01-40% by weight relative to the total amount of the ink composition. Moreover, the ink composition contains a synthetic resin emulsion as a binder component for fixing the glass flake pigment to a handwriting or a coated film in 0.01-40% by weight in solids relative to the total amount of the ink composition. The synthetic resin emulsion has an anionic property or a nonionic property and its minimum film forming temperature is not higher than 20° C.Type: GrantFiled: December 17, 2004Date of Patent: December 23, 2008Assignee: Sakura Color Products CorporationInventors: Yasuyuki Yoshimura, Naoshi Murata, Yuki Yamamoto, Tomohiro Sawa
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Publication number: 20080267811Abstract: An object of the present invention is to provide a material for more easily and accurately detecting treatment status using gas exposure. The present invention relates to an ink composition for detecting an oxidizing gas, or the like, comprising at least one type of azo dye, methine dye, triarylmethane dye and thiazine dye.Type: ApplicationFiled: March 30, 2005Publication date: October 30, 2008Applicant: SAKURA COLOR PRODUCTS CORPORATIONInventors: Norihiro Yamaguchi, Kyoko Sano, Hiroshi Inoue
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Patent number: 7396400Abstract: A water base erasable ink composition for use in marking pens which comprises 0.05-20% by weight of a colorant and 1-20% by weight of an oily material which is nonvolatile at normal temperatures (25° C.) and is dispersed in water, wherein the oily material has a viscosity of 5-40 mPa·s at 20° C. and is dispersed in water in the form of emulsion, and wherein the colorant is dispersed in the water with the aid of a polyvinyl alcohol resin as a dispersing agent which has a saponification degree of 70-85 mol % and of which aqueous solution of 4% concentration has a viscosity of 2-30 mPa·s at 20° C. in a weight ratio of the resin to the colorant of 0.5 to 5 and in an amount of 1 to 10% by weight based on the ink composition.Type: GrantFiled: January 14, 2004Date of Patent: July 8, 2008Assignee: Sakura Color Products CorporationInventors: Keiko Nakamura, Hidetoshi Fukuo, Jiro Nakagawa
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Patent number: D600748Type: GrantFiled: June 11, 2007Date of Patent: September 22, 2009Assignee: Sakura Color Products CorporationInventors: Daisuke Tabuchi, Masahiro Yasunaga
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Patent number: D604768Type: GrantFiled: August 13, 2008Date of Patent: November 24, 2009Assignee: Sakura Color Products CorporationInventors: Toshikazu Andoh, Kazuhiro Kawauchi