Patents by Inventor Motonari Udo
Motonari Udo 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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Patent number: 7846634Abstract: A developing agent including a toner particle obtained by using a dispersion containing a solvent, a granular mixed compound having a binder resin and a coloring agent dispersed in the solvent, and, as an additive to disperse a compound, a combination of a surfactant and a basic compound or a combination of a sulfone-based surfactant and a polycarboxylic acid-based surfactant, wherein the additive remaining in the developing agent is within a predetermine range.Type: GrantFiled: November 30, 2007Date of Patent: December 7, 2010Inventors: Takashi Urabe, Satoshi Araki, Takayasu Aoki, Tsuyoshi Ito, Yasuhito Noda, Motonari Udo, Masahiro Ikuta, Takafumi Hara
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Patent number: 7794912Abstract: A mixture containing a binder resin and a colorant is mixed with an aqueous medium, the resulting mixture liquid is mechanically sheared to finely granulate the mixture, fine particles are formed as cores, and a coating resin layer is formed on core surfaces, to obtain toner particles.Type: GrantFiled: January 16, 2007Date of Patent: September 14, 2010Assignees: Kabushiki Kaisha Toshiba, Toshiba Tec Kabushiki KaishaInventors: Takashi Urabe, Tsuyoshi Ito, Motonari Udo, Masahiro Ikuta
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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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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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Patent number: 7705096Abstract: In a manufacturing method of a resin for developing agent, a first polymerization agent is added in an aqueous medium; a radical polymerizable monomer is polymerized in the presence of a chain transfer agent to form a low molecular substance resin particle; after consuming the chain transfer agent, a second polymerization initiator is added in the aqueous medium; and the remaining monomer is polymerized to form a high molecular substance resin particle, thereby improving fixability of the developing agent.Type: GrantFiled: April 25, 2006Date of Patent: April 27, 2010Assignees: Kabushiki Kaisha Toshiba, Toshiba Tec Kabushiki KaishaInventors: Motonari Udo, Takashi Urabe, Tsuyoshi Ito, Masahiro Ikuta
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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: 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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Patent number: 7608378Abstract: A method for manufacturing a developing agent by mixing a coarsely granulated mixture containing a binder resin and a coloring agent with an aqueous medium and mechanically stirring the resulting mixed solution to finely granulate the coarsely granulated mixture, thereby forming a fine particle.Type: GrantFiled: June 2, 2006Date of Patent: October 27, 2009Assignees: Kabushiki Kaisha Toshiba, Toshiba Tec Kabushiki KaishaInventors: Takashi Urabe, Tsuyoshi Ito, Motonari Udo, Masahiro Ikuta
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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: 20090130579Abstract: A method for manufacturing a developing agent includes forming a toner particle by adding an aggregating agent to a dispersion containing fine particles containing a binder resin and a colorant to allow aggregation and melt adhesion to occur, wherein the pH of the dispersion satisfies the formula (1) below, when denoting pH before the addition of the aggregating agent by pH(A), the pH of the dispersion after the addition of the aggregating agent by pH(B), and the pH of the dispersion after the melt adhesion by pH(C): 0.90?pH(C)/pH(A)?0.25 and 1.00?pH(C)/pH(B)?0.30??(1).Type: ApplicationFiled: October 21, 2008Publication date: May 21, 2009Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHAInventors: Masahiro Ikuta, Takayasu Aoki, Takashi Urabe, Tsuyoshi Ito, Yasuhito Noda, Motonari Udo, Satoshi Araki, 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: 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: 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: 20080261144Abstract: A method for producing a developing agent, includes preparing a dispersion of particles containing a binder resin and a coloring agent and forming toner particles by aggregating and fusing the particles, in which the number of coarse particles having a particle size of 0.6 ?m or larger after the solid concentration of the dispersion of particles is adjusted to 1 ppm is less than 3,000 per ?L.Type: ApplicationFiled: April 16, 2008Publication date: October 23, 2008Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHAInventors: Masahiro Ikuta, Takayasu Aoki, Takashi Urabe, Tsuyoshi Ito, Motonari Udo, Satoshi Araki