Patents by Inventor Takayasu Aoki
Takayasu Aoki 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: 20130279944Abstract: An electrophotographic toner contains an electron donating color former compound, an electron accepting color developing agent, and a binder resin, wherein a toluene insoluble content in the electrophotographic toner is 10% by mass or more and 40% by mass or less, and the toner is decolorized by heating.Type: ApplicationFiled: June 18, 2013Publication date: October 24, 2013Inventors: Takayasu Aoki, Yasuhito Noda, Koji Imamiya, Tsuyoshi Itou, Noboru Furuyama
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Patent number: 8541156Abstract: According to one embodiment, a method for erasing an image includes erasing an image formed using a toner containing at least a binder resin, an electron donating color developable agent, and an electron accepting color developing agent by heating for 10 seconds or less. A color difference ?E between a region where the image is erased and a paper is 5 or less.Type: GrantFiled: May 23, 2011Date of Patent: September 24, 2013Assignee: Toshiba Tec Kabushiki KaishaInventors: Takayasu Aoki, Koji Imamiya, Katsunori Mizuta
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Patent number: 8512461Abstract: A decolorizable inkjet ink includes a first particle that contains a color-forming compound, a color-developing agent, and a polar group-containing crystalline binder; and a second particle that contains a decoloring agent and a polar group-containing crystalline binder.Type: GrantFiled: April 25, 2011Date of Patent: August 20, 2013Assignee: Toshiba Tec Kabushiki KaishaInventors: Tsuyoshi Itou, Takayasu Aoki, Koji Imamiya
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Patent number: 8486598Abstract: An electrophotographic toner contains an electron donating color former compound, an electron accepting color developing agent, and a polyester binder resin having a weight average molecular weight Mw of 6000 or more and 25000 or less, and the toner is decolorized by heating.Type: GrantFiled: November 19, 2010Date of Patent: July 16, 2013Assignees: Kabushiki Kaisha Toshiba, Toshiba Tec Kabushiki KaishaInventors: Takayasu Aoki, Yasuhito Noda, Koji Imamiya, Tsuyoshi Itou, Noboru Furuyama
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Patent number: 8487972Abstract: According to one embodiment, a decoloring apparatus includes: a heating rotating member having roughness (Rz) of a surface, which comes into contact with a conveyed sheet, equal to or larger than 3.5 ?m and equal to or smaller than 6.0 ?m and configured to heat and decolor a decolorable colorant on the sheet; and a pressing member configured to come into press contact with the heating rotating member to form a nip section between the pressing member and the heating rotating member and cooperate with the heating rotating member to nip and convey the sheet.Type: GrantFiled: April 25, 2011Date of Patent: July 16, 2013Assignee: Toshiba Tec Kabushiki KaishaInventors: Takayasu Aoki, Koji Imamiya, Noboru Furuyama
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Patent number: 8465897Abstract: An electrophotographic toner, which is decolorized by heating and a glossiness after decolorization of which is less than 10, comprising an electron donating color former compound, an electron accepting color developing agent, and a polyester binder resin.Type: GrantFiled: April 29, 2011Date of Patent: June 18, 2013Assignee: Toshiba Tec Kabushiki KaishaInventors: Takayasu Aoki, Yasuhito Noda, Koji Imamiya, Tsuyoshi Itou, Noboru Furuyama
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Patent number: 8426095Abstract: Disclosed is a decolorable toner containing a binder resin and a coloring agent which contains a color former compound and a color developing agent and has a capsule structure such that it is covered with an outer shell, and having a volume average particle diameter of from 5.0 to 15.0 ?m and a number-based particle size distribution CV of 35% or less.Type: GrantFiled: December 27, 2010Date of Patent: April 23, 2013Assignee: Toshiba Tec Kabushiki KaishaInventors: Takayasu Aoki, Junichi Ishikawa, Tsuyoshi Itou
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Publication number: 20130011776Abstract: Disclosed is a decolorable toner produced by aggregating dispersed fine particles of a color material containing at least a color-forming compound, a color-developing agent and a decoloring agent with dispersed fine particles containing at least a binder resin having a carboxyl group, then adding a compound having a carbodiimide group or an epoxy group reactive with the carboxyl group of the binder resin, and thereafter fusing the aggregate particles, respectively in an aqueous medium. The thus obtained decolorable toner can suppress the generation of fine powder by the release of erasable color material fine particles from the toner particles.Type: ApplicationFiled: June 29, 2012Publication date: January 10, 2013Applicant: TOSHIBA TEC KABUSHIKI KAISHAInventors: Takayasu Aoki, Motonari Udo, Tsuyoshi Itou, Masahiro Ikuta, Takafumi Hara
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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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Publication number: 20130011775Abstract: Disclosed is a toner obtained by coating surfaces of core particles including at least a binder resin having a carboxyl group and a coloring agent with successive coatings of a water-soluble crosslinking agent capable of crosslinking with a carboxyl group and a water-soluble polymer having a carboxyl group, which have been successively applied on the core particles and crosslinked with each other. The thus-formed toner is provided with a good harmony of favorable fixability represented by a low lowest fixable temperature and favorable storage stability represented by little aggregation after standing at 50° C. for 8 hours.Type: ApplicationFiled: June 29, 2012Publication date: January 10, 2013Applicant: TOSHIBA TEC KABUSHIKI KAISHAInventors: Tsuyoshi Itou, Motonari Udo, Kazuhisa Takeda, Takayasu Aoki, Masahiro Ikuta, Takafumi Hara
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Publication number: 20120328977Abstract: Encapsulated toner particles are formed by: aggregating core material particles containing at least a colorant and a core material resin in an aqueous dispersion medium to form core particles; adding coating resin particles into the aqueous dispersion medium during progress of the formation of the core material at a point of time when the volume-based median particle diameter of the core particles formed by the aggregation reaches 30 to 83% of that of desired toner particles; and continuing the aggregation to form a coating layer composed of a composite aggregate of the core material particles and the coating resin particles on the core material. In the thus-obtained toner, the colorant is uniformly and well incorporated in the toner particles, and therefore, the coloring ability is improved without causing a problem of release of fine powder.Type: ApplicationFiled: June 18, 2012Publication date: December 27, 2012Applicant: TOSHIBA TEC KABUSHIKI KAISHAInventors: Masahiro Ikuta, Takayasu Aoki, Tsuyoshi Itou, Motonari Udo, Takafumi Hara, Kazuhisa Takeda
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Patent number: 8227167Abstract: The method for producing a developing agent according to the invention contains subjecting the toner material dispersion liquid to mechanical shearing to make the granular mixture into fine particles, thereby providing a dispersion liquid containing fine particles having a smaller particle diameter than a particle diameter of the granular mixture. The toner material dispersion liquid is subjected to mechanical shearing under a temperature of a glass transition point Tg of the binder resin or more and a pressure of 10 MPa or more, and the resulting dispersion liquid containing the fine particles is depressurized with two or more stages while maintaining the temperature of a glass transition point Tg of the binder resin or more and then cooled to a temperature of a glass transition point Tg of the binder resin or less.Type: GrantFiled: July 9, 2009Date of Patent: July 24, 2012Assignees: Kabushiki Kaisha Toshiba, Toshiba Tec Kabushiki KaishaInventors: Tsuyoshi Itou, Takayasu Aoki, Takashi Urabe, Yasuhito Noda, Motonari Udo, Satoshi Araki, Masahiro Ikuta, Takafumi Hara, Asumi Matsumoto
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Publication number: 20120082928Abstract: Disclosed is a decolorizable electrophotographic toner, including: a binder resin; and a colorant which contains at least a color developable compound and a color developing agent and is covered with an outer shell so as to have a capsule structure, wherein the number ratio of particles having an equivalent circle diameter of 0.6 ?m or more and 2.5 ?m or less of the toner when measured using a flow particle image analyzer after the toner is dispersed in an aqueous medium at a ratio of 0.08% by weight and the resulting dispersion is subjected to a stirring treatment in which stirring is performed at 5000 rpm for 30 minutes using a homogenizer (T-25 digital ULTRA-TURRAX (manufactured by IKA Japan K.K., provided with a shaft generator S25N-10G)) is 30% by number or less.Type: ApplicationFiled: October 3, 2011Publication date: April 5, 2012Applicants: TOSHIBA TEC KABUSHIKI KAISHA, THE PILOT INK CO., LTD., KABUSHIKI KAISHA PILOT CORPORATIONInventors: Masahiro Ikuta, Takahito Kabai, Takayasu Aoki, Tsuyoshi Itou
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Publication number: 20120082931Abstract: Disclosed is a producing method of a decolorizable toner, comprising dispersing a mixed composition containing encapsulated colorant particles which are particles containing a color developable compound and a color developing agent and coated with an outer shell, a polymerizable monomer, and a release agent in an aqueous medium, and subjecting the polymerizable monomer to suspension polymerization in the aqueous medium.Type: ApplicationFiled: August 31, 2011Publication date: April 5, 2012Applicant: TOSHIBA TEC KABUSHIKI KAISHAInventors: Tsuyoshi Itou, Takahito Kabai, Takayasu Aoki, Masahiro Ikuta
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Publication number: 20110294052Abstract: According to one embodiment, a method for erasing an image includes erasing an image formed using a toner containing at least a binder resin, an electron donating color developable agent, and an electron accepting color developing agent by heating for 10 seconds or less. A color difference ?E between a region where the image is erased and a paper is 5 or less.Type: ApplicationFiled: May 23, 2011Publication date: December 1, 2011Applicant: TOSHIBA TEC KABUSHIKI KAISHAInventors: Takayasu Aoki, Koji Imamiya, Katsunori Mizuta
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Publication number: 20110262197Abstract: According to one embodiment, an image forming apparatus includes a mode setting section configured to set an operation mode in a manner that the image forming apparatus is operated in an erasing mode if an erasing operation is instructed, a supplying section configured to supply a medium on which the image formation is completed, and which is set in an designated or specified receiving section, a decoloring section configured to decolor the color of the formed image by carrying the medium to a heating section that includes at least heating and decoloring function, and a return section configured to return the operation mode to a predetermined mode except for the erasing mode from the erasing mode, when the last medium on which the image formation is completed and which is set in the receiving section is decolored.Type: ApplicationFiled: March 17, 2011Publication date: October 27, 2011Applicants: TOSHIBA TEC KABUSHIKI KAISHA, KABUSHIKI KAISHA TOSHIBAInventors: Koji Imamiya, Takayasu Aoki, Tsuyoshi Itou, Hiromichi Mitamura, Noboru Furuyama
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Publication number: 20110262857Abstract: An electrophotographic toner contains an electron donating color developable agent, an electron accepting color developing agent, and a polyester resin binder which is a polyester resin obtained by polycondensation of a carboxylic acid component and an alcohol component and has a crosslinked structure formed of a crosslinking component including at least either one of a trivalent or higher valent carboxylic acid and a trihydric or higher hydric alcohol, and is decolorized by heating.Type: ApplicationFiled: April 25, 2011Publication date: October 27, 2011Applicant: TOSHIBA TEC KABUSHIKI KAISHAInventors: Takayasu Aoki, Koji Imamiya, Tsuyoshi Itou
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Publication number: 20110259237Abstract: A decolorizable inkjet ink includes a first particle that contains a color-forming compound, a color-developing agent, and a polar group-containing crystalline binder; and a second particle that contains a decoloring agent and a polar group-containing crystalline binder.Type: ApplicationFiled: April 25, 2011Publication date: October 27, 2011Applicant: TOSHIBA TEC KABUSHIKI KAISHAInventors: Tsuyoshi Itou, Takayasu Aoki, Koji Imamiya
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Publication number: 20110261133Abstract: According to one embodiment, a decoloring apparatus includes: a heating rotating member having roughness (Rz) of a surface, which comes into contact with a conveyed sheet, equal to or larger than 3.5 ?m and equal to or smaller than 6.0 ?m and configured to heat and decolor a decolorable colorant on the sheet; and a pressing member configured to come into press contact with the heating rotating member to form a nip section between the pressing member and the heating rotating member and cooperate with the heating rotating member to nip and convey the sheet.Type: ApplicationFiled: April 25, 2011Publication date: October 27, 2011Applicant: TOSHIBA TEC KABUSHIKI KAISHAInventors: Takayasu Aoki, Koji Imamiya, Noboru Furuyama
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Publication number: 20110262850Abstract: There is provided a method for producing a toner that includes encapsulated erasable colored fine particles aggregated with fine particles that contain at least a binder resin and a release agent. The method includes: mixing a dispersion of erasable fine particles with an aggregating agent to form an aggregating agent-containing colored fine particle dispersion; and mixing the aggregating agent-containing colored fine particle dispersion with a fine particle dispersion that contains at least a binder resin and a release agent, so as to aggregate the aggregating agent-containing colored fine particles with the fine particles that contain at least a binder resin and a release agent. In this way, the encapsulated colored fine particles are prevented from being released from the resultant toner particles, and an erasable toner can be obtained that has a narrow particle size distribution and that produces less fogging.Type: ApplicationFiled: April 14, 2011Publication date: October 27, 2011Applicant: TOSHIBA TEC KABUSHIKI KAISHAInventors: Tsuyoshi Itou, Takayasu Aoki, Koji Imamiya, Masahiro Ikuta