Patents by Inventor Tsuyoshi Itou
Tsuyoshi Itou 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: 7851120Abstract: The dispersion liquid including toner material particles is introduced into a mechanical shearing device including a heating unit, a mechanical shearing unit, and a cooling unit, heated to a temperature not lower than the glass transition temperature of the polyester resin under a condition that satisfies the following relationship (1), subjected to mechanical shearing, and thereafter cooled, whereby fine particles are obtained. ?2<log ((A+B)/C)<2??(1) With the proviso that a volume of a portion in which the dispersion liquid flows in the heating unit and the mechanical shearing unit is expressed as A cc, a volume of a portion in which the dispersion liquid flows in the cooling unit is expressed as B cc, and a flow rate of the dispersion liquid is expressed as C cc/min.Type: GrantFiled: December 9, 2008Date of Patent: December 14, 2010Assignees: Kabushiki Kaisha Toshiba, Toshiba Tec Kabushiki KaishaInventors: Takashi Urabe, Takayasu Aoki, Tsuyoshi Itou, Yasuhito Noda, Motonari Udo, Satoshi Araki, Masahiro Ikuta, Takafumi Hara, Asumi Matsumoto
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Publication number: 20100310981Abstract: According to one embodiment, a method for producing a developing agent includes pulverizing a mixture in the form of coarse particles of a toner material including a coloring agent and a binder resin by mechanical shearing, aggregating and fusing the resulting fine particles. The solid content concentration in a dispersion liquid including the aggregated particles is from 5.0% to 40.0%, the volume average particle diameter of the aggregated particles is from 1.0 ?m to 10.0 ?m, and the ratio of the standard deviation to the volume average particle diameter is 30.0% or less.Type: ApplicationFiled: June 2, 2010Publication date: December 9, 2010Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHAInventors: Junichi Ishikawa, Takayasu Aoki, Tsuyoshi Itou, Yasuhito Noda, Motonari Udo, Satoshi Araki, Masahiro Ikuta, Takafumi Hara, Takashi Urabe, Taishi Takano, Yasuo Goto
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Publication number: 20100304286Abstract: Disclosed is an decolorizable electrophotographic toner, containing a binder resin, an electron-donating color-developable agent, and a wax having a color-developing action and having an acid value of 60 mgKOH/g or more.Type: ApplicationFiled: May 18, 2010Publication date: December 2, 2010Applicant: TOSHIBA TEC KABUSHIKI KAISHAInventors: Takayasu Aoki, Takahito Kabai, Tsuyoshi Itou
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Publication number: 20100304142Abstract: According to one embodiment, a method for producing a color erasable recording material includes dispersing a granulated mixture of a color erasable recording material in an aqueous medium to form an aqueous dispersion liquid, and subjecting the dispersion liquid to a high-pressure pulverizer at a temperature not lower than the melting point of a color erasing agent to pulverize the granulated mixture in the dispersion liquid, thereby obtaining a particulate color erasable recording material having a volume average particle diameter smaller than that of the granulated mixture.Type: ApplicationFiled: May 21, 2010Publication date: December 2, 2010Applicant: TOSHIBA TEC KABUSHIKI KAISHAInventors: Tsuyoshi Itou, Takayasu Aoki
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Publication number: 20100209840Abstract: As a first dispersion liquid containing first fine particles and a second dispersion liquid containing second fine particles, those satisfy the relationship represented by the following formula (1) are used, and these two dispersion liquids are mixed with each other, and an aggregating agent and a pH adjusting agent are added thereto in sequence, whereby encapsulation is achieved by selective formation of core particles through aggregation of the first fine particles and shells through aggregation of the second fine particles. 15 mV?|Z2?Z1|?5 mV??(1) In the formula, Z1 and Z2 represent zeta potentials of the first dispersion liquid and the second dispersion liquid, respectively, measured when aluminum sulfate is added to each dispersion liquid in an amount of 1% by weight based on the solid content in each dispersion liquid.Type: ApplicationFiled: December 15, 2009Publication date: August 19, 2010Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHAInventors: Masahiro Ikuta, Takayasu Aoki, Takashi Urabe, Tsuyoshi Itou, Satoshi Araki, Motonari Udo, Takafumi Hara
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Publication number: 20100209839Abstract: A method for producing a developing agent including preparing a dispersion liquid containing first fine particles containing a binder resin and second fine particles containing a color developable compound, a color coupler, and a color eraser, and aggregating the first and second fine particles in the dispersion liquid to form aggregated particles.Type: ApplicationFiled: February 11, 2010Publication date: August 19, 2010Applicant: TOSHIBA TEC KABUSHIKI KAISHAInventors: Takahito Kabai, Tsuyoshi Itou
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Patent number: 7763408Abstract: A dispersion containing a coloring agent particle is mixed in a dispersion of a radical polymerizable monomer, and a reducing agent containing an iron(II) salt is added in the presence of a polymerization initiator to polymerize the dispersed radical polymerizable monomer by the action of a generated radical, thereby not only forming a binder resin fine particle but coagulating the binder resin fine particle and the coloring agent particle to form a coagulated particle.Type: GrantFiled: November 29, 2007Date of Patent: July 27, 2010Assignees: Kabushiki Kaisha Toshiba, Toshiba Tec Kabushiki KaishaInventors: Motonari Udo, Takashi Urabe, Tsuyoshi Itou, Masahiro Ikuta
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Publication number: 20100159386Abstract: A method for producing a developing agent, wherein in the formation of aggregated particles, particles in a dispersion liquid have a volume average particle diameter of 2 ?m or less when the pH of the dispersion liquid is 7, and also the pH of the dispersion liquid is from 3.0 to 6.9 when the zeta potential of the particles is ?30 mV.Type: ApplicationFiled: December 15, 2009Publication date: June 24, 2010Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHAInventors: Takashi Urabe, Takayasu Aoki, Tsuyoshi Itou, Motonari Udo, Satoshi Araki, Masahiro Ikuta, Takafumi Hara
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Publication number: 20100109273Abstract: An intermediate shaft is provided which connects a steering shaft and a steering gear mechanism together via a universal joint, a shoulder bolt is provided which fastens one of yokes of the universal joint and a shaft portion of the intermediate shaft and on which a small diameter portion and a large diameter portion which are adapted to be brought into engagement with an outer circumferential surface of the shaft portion are formed sequentially from a distal end portion side, and the intermediate shaft has a bolt engagement recess portion which is formed on an outer circumferential surface of the shaft portion in such a manner as to extend in a direction which intersects an axial direction and which is adapted to be brought into engagement with the large diameter portion of the shoulder bolt and a dislocation preventive projecting portion which is formed on an outer circumferential surface of an end portion thereof, whereby a temporary fastening is implemented by bringing the small diameter portion of the shType: ApplicationFiled: April 25, 2008Publication date: May 6, 2010Applicant: NSK LTD.Inventors: Seiichi Moriyama, Hiromichi Komori, Tsuyoshi Itou, Masaharu Igarashi, Yoshiro Udo
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Publication number: 20100009276Abstract: In a method for producing a developing agent by coagulating a toner fine particle dispersion including a toner fine particle, an aqueous medium and a dispersant to obtain a toner particle, the coagulation is carried out only by pH adjustment, the dispersant is a surfactant, and a concentration of the surfactant is a concentration of not more than a critical micell concentration of the toner material dispersion.Type: ApplicationFiled: July 9, 2009Publication date: January 14, 2010Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHAInventors: Takayasu Aoki, Asumi Matsumoto, Takashi Urabe, Tsuyoshi Itou, Motonari Udo, Satoshi Araki, Masahiro Ikuta, Takafumi Hara, Yasuhito Noda
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Publication number: 20100009281Abstract: 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: ApplicationFiled: July 9, 2009Publication date: January 14, 2010Applicants: 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: 20090246682Abstract: A surfactant is added in an amount of from 0.1 to 5% by weight of the total weight of a developing agent at the time of at least either kneading a toner material or subjecting the toner material to mechanical shearing.Type: ApplicationFiled: March 27, 2009Publication date: October 1, 2009Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHAInventors: Takafumi Hara, Takashi Urabe, Takayasu Aoki, Tsuyoshi Itou, Yasuhito Noda, Motonari Udo, Satoshi Araki, Masahiro Ikuta, Asumi Matsumoto, Yasuo Goto
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Publication number: 20090155708Abstract: The dispersion liquid including toner material particles is introduced into a mechanical shearing device including a heating unit, a mechanical shearing unit, and a cooling unit, heated to a temperature not lower than the glass transition temperature of the polyester resin under a condition that satisfies the following relationship (1), subjected to mechanical shearing, and thereafter cooled, whereby fine particles are obtained. ?2<log((A+B)/C)<2??(1) With the proviso that a volume of a portion in which the dispersion liquid flows in the heating unit and the mechanical shearing unit is expressed as A cc, a volume of a portion in which the dispersion liquid flows in the cooling unit is expressed as B cc, and a flow rate of the dispersion liquid is expressed as C cc/min.Type: ApplicationFiled: December 9, 2008Publication date: June 18, 2009Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHAInventors: Takashi Urabe, Takayasu Aoki, Tsuyoshi Itou, Yasuhito Noda, Motonari Udo, Satoshi Araki, Masahiro Ikuta, Takafumi Hara, Asumi Matsumoto
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Publication number: 20090155702Abstract: After fine particles containing a binder resin and a coloring agent are agglomerated in a dispersion liquid to form agglomerated particles, an inverting agent which inverts a sign of a zeta potential of the agglomerated particles is added to the dispersion liquid to stabilize the agglomerated particles, and then, the agglomerated particles are fused.Type: ApplicationFiled: December 9, 2008Publication date: June 18, 2009Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHAInventors: Masahiro Ikuta, Takayasu Aoki, Takashi Urabe, Tsuyoshi Itou, Yasuhito Noda, Motonari Udo, Satoshi Araki, Takafumi Hara, Asumi Matsumoto
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Publication number: 20090136864Abstract: It is intended to provide a method includes the step of forming agglomerated particles by agglomerating fine particulate mixture containing a binder resin and a colorant. In the step of forming agglomerated particles, a cationic organic coagulating agent having an average molecular weight of from 1000 to 100000 is added to a liquid dispersion containing fine particles.Type: ApplicationFiled: October 2, 2008Publication date: May 28, 2009Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHAInventors: Tsuyoshi Itou, Takayasu Aoki, Takashi Urabe, Motonari Udo, Yasuhito Noda, Satoshi Araki, Masahiro Ikuta, Takafumi Hara
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Publication number: 20090130589Abstract: A method for producing a developing agent contains mechanically shearing a mixture containing a polyester resin, a colorant and a releasing agent to form first fine particles, aggregating the first fine particles to form aggregated particles as a core, aggregating second fine particles containing a polyester resin onto the core to form a shell.Type: ApplicationFiled: October 29, 2008Publication date: May 21, 2009Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHAInventors: Motonari Udo, Takayasu Aoki, Takashi Urabe, Tsuyoshi Itou, Yasuhito Noda, Satoshi Araki, Masahiro Ikuta, Takafumi Hara
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Publication number: 20090130585Abstract: A coarse particle containing a polyester based resin and a coloring agent is added in an aqueous medium containing a surfactant, a basic substance and an inorganic water-soluble electrolyte, and dispersion and coagulation are carried out to form a toner particle.Type: ApplicationFiled: November 6, 2008Publication date: May 21, 2009Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHAInventors: Takayasu Aoki, Takashi Urabe, Takafumi Hara, Tsuyoshi Itou, Masahiro Ikuta, Motonari Udo, Yasuhito Noda, Satoshi Araki, Asumi Matsumoto
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Publication number: 20080286678Abstract: A developing agent including a core containing an amorphous polyester resin and a fatty acid ester based wax, a shell provided on the surface of the core and containing a copolymer of an aromatic vinyl monomer and acrylic acid or an acrylic ester, and a coloring agent.Type: ApplicationFiled: May 13, 2008Publication date: November 20, 2008Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHAInventors: Takayasu Aoki, Motonari Udo, Masahiro Ikuta, Tsuyoshi Itou, Takashi Urabe, Takafumi Hara, Satoshi Araki, Yasuhito Noda
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Publication number: 20080131809Abstract: A dispersion containing a coloring agent particle is mixed in a dispersion of a radical polymerizable monomer, and a reducing agent containing an iron(II) salt is added in the presence of a polymerization initiator to polymerize the dispersed radical polymerizable monomer by the action of a generated radical, thereby not only forming a binder resin fine particle but coagulating the binder resin fine particle and the coloring agent particle to form a coagulated particle.Type: ApplicationFiled: November 29, 2007Publication date: June 5, 2008Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHAInventors: Motonari Udo, Takashi Urabe, Tsuyoshi Itou, Masahiro Ikuta
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Publication number: 20080131801Abstract: A method including polymerization performed with the use of a binder resin dispersion containing a styrene monomer, a compound having one or more unsaturated bond and sulfonic acid or sulfonate, and an acrylic ester monomer, wherein the contents of the monomers and the compound are 60 to 90 mol %, 1 mol ppm to 10 mol %, and 10 to 40 mol %, respectively.Type: ApplicationFiled: November 29, 2007Publication date: June 5, 2008Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHAInventors: Motonari Udo, Takayasu Aoki, Takashi Urabe, Tsuyoshi Itou, Satoshi Araki, Masahiro Ikuta