Patents by Inventor Koji Shimokusa
Koji Shimokusa 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: 10031432Abstract: According to the present invention, there are provided a process for producing a toner for development of electrostatic images which is capable of suppressing desorption and exposure of a releasing agent therein, and excellent in fusing property, suppression of toner cloud and durability; a process for producing a dispersion, and a kit for producing the dispersion.Type: GrantFiled: June 13, 2014Date of Patent: July 24, 2018Assignee: KAO CORPORATIONInventors: Hiroshi Mizuhata, Koji Shimokusa
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Patent number: 9529290Abstract: The present invention relates to a process for producing a toner for electrophotography which is capable of suppressing liberation of a wax from a resin binder and exposure of the wax to a surface of respective toner particles in the step of obtaining fused particles upon production of the toner, and reducing a content of fine powders in the toner, and which is characterized by an excellent low-temperature fusing property and an excellent anti-high-temperature offset property.Type: GrantFiled: October 4, 2013Date of Patent: December 27, 2016Assignee: KAO CORPORATIONInventors: Yasuhiro Shidahara, Manato Ikeda, Hiroshi Mizuhata, Koji Shimokusa
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Publication number: 20160179021Abstract: According to the present invention, there are provided a process for producing a toner for development of electrostatic images which is capable of suppressing desorption and exposure of a releasing agent therein, and excellent in fusing property, suppression of toner cloud and durability; a process for producing a dispersion, and a kit for producing the dispersion.Type: ApplicationFiled: June 13, 2014Publication date: June 23, 2016Applicant: KAO CORPORATIONInventors: Hiroshi MIZUHATA, Koji SHIMOKUSA
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Publication number: 20150277250Abstract: The present invention relates to a process for producing a toner for electrophotography which is capable of suppressing liberation of a wax from a resin binder and exposure of the wax to a surface of respective toner particles in the step of obtaining fused particles upon production of the toner, and reducing a content of fine powders in the toner, and which is characterized by an excellent low-temperature fusing property and an excellent anti-high-temperature offset property.Type: ApplicationFiled: October 4, 2013Publication date: October 1, 2015Applicant: KAO CORPORATIONInventors: Yasuhiro Shidahara, Manato Ikeda, Hiroshi Mizuhata, Koji Shimokusa
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Patent number: 9005868Abstract: The present invention relates to a process for producing a toner for electrophotography which includes the step of fusing aggregated particles containing resin particles (A) and releasing agent particles in an aqueous mixed solution containing the aggregated particles and an anionic surfactant having a polyalkylene glycol moiety with an average molar number of addition of an alkylene oxide having 2 to 3 carbon atoms of from 5 to 100 after and/or while adjusting a pH value of the aqueous mixed solution to 2.0 to 6.0 as measured at 25° C., and a toner for electrophotography obtained by the process.Type: GrantFiled: December 9, 2011Date of Patent: April 14, 2015Assignee: Kao CorporationInventors: Shoichi Murata, Takayuki Ikenaga, Takashi Okuno, Hiroshi Mizuhata, Keishi Yokota, Koji Shimokusa, Koji Kameyama
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Patent number: 8940468Abstract: Disclosed is a process for production of a decolorable toner, including: aggregating dispersed fine particles of a color material comprising at least a color-forming compound, a color-developing agent and a decoloring agent with dispersed fine particles comprising at least a binder resin comprising a polyester resin to form aggregates in an aqueous medium, adding a reactive polymer having an oxazoline group in to the aqueous medium, and fusing the aggregates in the aqueous medium. As a result, it becomes possible to produce a decolorable toner which suppresses the generation of fine powder due to the release of fine particles of an erasable color material from the toner.Type: GrantFiled: June 29, 2012Date of Patent: January 27, 2015Assignee: Toshiba Tec Kabushiki KaishaInventors: Takayasu Aoki, Takafumi Hara, Tsuyoshi Itou, Masahiro Ikuta, Motonari Udo, Koji Shimokusa, Hiroshi Mizuhata
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Publication number: 20130295499Abstract: The present invention relates to a process for producing a toner for electrophotography which includes the step of fusing aggregated particles containing resin particles (A) and releasing agent particles in an aqueous mixed solution containing the aggregated particles and an anionic surfactant having a polyalkylene glycol moiety with an average molar number of addition of an alkylene oxide having 2 to 3 carbon atoms of from 5 to 100 after and/or while adjusting a pH value of the aqueous mixed solution to 2.0 to 6.0 as measured at 25° C., and a toner for electrophotography obtained by the process.Type: ApplicationFiled: December 9, 2011Publication date: November 7, 2013Applicant: KAO CORPORATIONInventors: Shoichi Murata, Takayuki Ikenaga, Takashi Okuno, Hiroshi Mizuhata, Keishi Yokota, Koji Shimokusa, Koji Kameyama
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Publication number: 20130011777Abstract: Disclosed is a process for production of a decolorable toner, including: aggregating dispersed fine particles of a color material comprising at least a color-forming compound, a color-developing agent and a decoloring agent with dispersed fine particles comprising at least a binder resin comprising a polyester resin to form aggregates in an aqueous medium, adding a reactive polymer having an oxazoline group in to the aqueous medium, and fusing the aggregates in the aqueous medium. As a result, it becomes possible to produce a decolorable toner which suppresses the generation of fine powder due to the release of fine particles of an erasable color material from the toner.Type: ApplicationFiled: June 29, 2012Publication date: January 10, 2013Applicant: TOSHIBA TEC KABUSHIKI KAISHAInventors: Takayasu Aoki, Takafumi Hara, Tsuyoshi Itou, Masahiro Ikuta, Motonari Udo, Koji Shimokusa, Hiroshi Mizuhata
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Patent number: 7723002Abstract: A toner for electrostatic image development, comprising a resin binder comprising a crystalline polyester; a releasing agent comprising a wax having a melting point of from 60 to 85° C. and a penetration at 25° C. of from 4 to 10; and a colorant. The toner for electrostatic image development can be used, for instance, for the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.Type: GrantFiled: September 23, 2004Date of Patent: May 25, 2010Assignee: Kao CorporationInventors: Koji Shimokusa, Shinichi Sata, Yasuhiro Hidaka
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Patent number: 7625684Abstract: A toner for electrophotography containing a resin binder and a colorant, wherein the resin binder contains a polyester in an amount higher than 50% by weight of the resin binder, wherein the polyester is obtained by polycondensing an alcohol component containing 60% by mol or more of an aliphatic diol having 3 to 10 carbon atoms and a carboxylic acid component comprising 80% by mol or more of an aromatic dicarboxylic acid compound, the polyester having an index of crystallinity of from 0.6 to 1.5, and a glass transition temperature of 0° C. or more and less than 40° C. The toner for electrophotography of the present invention can be used for, for example, developing electrostatic latent images formed in electrophotography, electrostatic recording method, electrostatic printing method, or the like.Type: GrantFiled: July 5, 2005Date of Patent: December 1, 2009Assignee: Kao CorporationInventors: Nobumichi Kamiyoshi, Koji Shimokusa, Takashi Yamaguchi, Shinichi Sata
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Patent number: 7579129Abstract: The present invention relates to a process for preparing a toner for electrophotography comprising a crystalline polyester and a colorant, wherein the colorant is added in at least one of the neutralizing step, the emulsifying step, and the aggregating step and a process for preparing a toner for electrophotography comprising a crystalline polyester and a colorant, wherein the colorant is added in at least one of the neutralizing and emulsifying step, and the aggregating step. The toner obtained according to the process of the present invention can be suitably used, for example, in development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method, or the like.Type: GrantFiled: May 25, 2005Date of Patent: August 25, 2009Assignee: Kao CorporationInventors: Nobumichi Kamiyoshi, Koji Shimokusa, Hiroyuki Kawaji
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Publication number: 20060029875Abstract: A toner for electrophotography containing a resin binder and a colorant, wherein the resin binder contains a polyester in an amount higher than 50% by weight of the resin binder, wherein the polyester is obtained by polycondensing an alcohol component containing 60% by mol or more of an aliphatic diol having 3 to 10 carbon atoms and a carboxylic acid component comprising 80% by mol or more of an aromatic dicarboxylic acid compound, the polyester having an index of crystallinity of from 0.6 to 1.5, and a glass transition temperature of 0° C. or more and less than 40° C. The toner for electrophotography of the present invention can be used for, for example, developing electrostatic latent images formed in electrophotography, electrostatic recording method, electrostatic printing method, or the like.Type: ApplicationFiled: July 5, 2005Publication date: February 9, 2006Applicant: KAO CORPORATIONInventors: Nobumichi Kamiyoshi, Koji Shimokusa, Takashi Yamaguchi, Shinichi Sata
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Publication number: 20050271965Abstract: The present invention relates to a process for preparing a toner for electrophotography comprising a crystalline polyester and a colorant, wherein the colorant is added in at least one of the neutralizing step, the emulsifying step, and the aggregating step and a process for preparing a toner for electrophotography comprising a crystalline polyester and a colorant, wherein the colorant is added in at least one of the neutralizing and emulsifying step, and the aggregating step. The toner obtained according to the process of the present invention can be suitably used, for example, in development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method, or the like.Type: ApplicationFiled: May 25, 2005Publication date: December 8, 2005Applicant: KAO CORPORATIONInventors: Nobumichi Kamiyoshi, Koji Shimokusa, Hiroyuki Kawaji
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Publication number: 20050095523Abstract: A toner for electrostatic image development, comprising a resin binder comprising a crystalline polyester; a releasing agent comprising a wax having a melting point of from 60 to 85° C. and a penetration at 25° C. of from 4 to 10; and a colorant. The toner for electrostatic image development can be used, for instance, for the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.Type: ApplicationFiled: September 23, 2004Publication date: May 5, 2005Applicant: KAO CORPORATIONInventors: Koji Shimokusa, Shinichi Sata, Yasuhiro Hidaka
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Patent number: 6660442Abstract: A nonmagnetic black toner for reversal development comprising a resin binder; and a black colorant comprising a composite oxide of two or more metals, the composite oxide having an oil absorption per unit area of 0.07 ml/m2 or less. The nonmagnetic black toner can be suitably used for the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.Type: GrantFiled: April 3, 2002Date of Patent: December 9, 2003Assignee: Kao CorporationInventors: Shinichi Sata, Akihiro Eida, Koji Shimokusa, Jun Shimizu
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Publication number: 20020177059Abstract: A nonmagnetic black toner for reversal development comprising a resin binder; and a black colorant comprising a composite oxide of two or more metals, the composite oxide having an oil absorption per unit area of 0.07 ml/m2 or less. The nonmagnetic black toner can be suitably used for the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.Type: ApplicationFiled: April 3, 2002Publication date: November 28, 2002Inventors: Shinichi Sata, Akihiro Eida, Koji Shimokusa, Jun Shimizu
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Patent number: 5655202Abstract: A fixing apparatus for fixing visible images formed on a recording medium has a heat roller having a heating member in the inner portion of the heat roller, and a flat plate-like elastic member forming a nip in contact with the heat roller and capable of exerting a pressure at the nip portion by an elastic stress, the recording medium being fed into the nip portion. According to the fixing apparatus and the fixing method using this apparatus, since a pressure roller is not necessary, the system can be simplified, which leads to miniaturization of the overall fixing apparatus, reduction of overall weight and cost reduction.Type: GrantFiled: February 20, 1996Date of Patent: August 5, 1997Assignee: Kao CorporationInventors: Yoshio Yoshimura, Ikuo Takahashi, Shuji Watanabe, Koji Akiyama, Koji Shimokusa
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Patent number: 5567567Abstract: The encapsulated toner for heat-and-pressure fixing of the present invention having a heat-fusible core material containing at least a thermoplastic resin and a shell formed thereon so as to cover the surface of the core material is produced by the method having the steps of (a) dispersing in a shell-forming resin an additive selected from the group consisting of conductive materials, charge control agents, wax components, color pigments, particulate magnetic materials, and mixtures thereof to give a shell-forming resin containing the additive; (b) dissolving the shell-forming resin containing the additive in a mixture containing a core material-constituting monomer; (c) dispersing the mixture obtained in step (b) in an aqueous dispersant, and localizing the shell-forming resin containing the additive on the surface of droplets of the core-constituting material to give a polymerizable composition; and (d) polymerizing the polymerizable composition obtained in step (c) by in situ polymerization to form the corType: GrantFiled: November 2, 1994Date of Patent: October 22, 1996Assignee: Kao CorporationInventors: Koji Akiyama, Takashi Yamaguchi, Koji Kameyama, Koji Shimokusa
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Patent number: 5565293Abstract: The encapsulated toner for heat-and-pressure fixing of the present invention has a heat-fusible core material containing at least a thermoplastic resin and a coloring agent and a shell formed thereon so as to cover the surface of the core material. Moreover, the encapsulated toner has the following properties: 1) The glass transition temperature ascribed to the thermoplastic resin used as a main component of the heat-fusible core material is 10.degree. C. to 50.degree. C.; 2) A minimum load required for 58 compression of a particle size of the encapsulated toner is from 5 to 50 mgf, and a minimum load required for 10% compression of a particle size of the encapsulated toner is from 10 to 100 mgf, when a compressive variation of one toner particle is measured by a micro compression testing machine under the given conditions; and 3) The difference in cohesiveness before and after keeping the toner standing at 50.degree. C.Type: GrantFiled: March 9, 1995Date of Patent: October 15, 1996Assignee: KAO CorporationInventors: Koji Akiyama, Koji Kameyama, Koji Shimokusa, Kuniyasu Kawabe
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Patent number: 5330870Abstract: An electrophotographic developer composition for flash fusing containing at least a binder resin based on a polyester resin and a colorant, the polyester resin being formed between an acid component, not less than 80 mol % of the acid component being phthalic acid series dicarboxylic acid and an alcohol component, not less than 80 mol % of the alcohol component being bisphenol A alkylene oxide adduct, the polyester resin having an acid value of not more than 10.0 KOH mg/g, a softening temperature of not less than 95.0.degree. C. and not more than 125.0.degree. C. as determined using a flow tester of the "koka-shiki" type and a glass transition temperature of not less than 50.0.degree. C. and not more than 80.0.degree. C. as determined by DSC, whereby substantially no odor is produced upon flash fusing.Type: GrantFiled: August 31, 1992Date of Patent: July 19, 1994Assignee: Kao CorporationInventors: Shingo Tanaka, Koji Nishibuchi, Koji Shimokusa, Tetsuya Ueno