Patents by Inventor Futoshi Kadonome
Futoshi Kadonome 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: 10698329Abstract: Provided is an electrostatic charge image developer containing toner particles and carrier particles, wherein the toner particles contain at least silica particles or alumina particles as an external additive; the carrier particles contain core material particles and a coating resin layer covering a surface of the core particles; the coating resin layer contains metal oxide particles; an element measured by XPS (photoelectron spectroscopy) of the carrier particle is at least Si or Al; and a content of Si or Al in the carrier particle is in the range of 1 to 6 at % with respect to the total elements constituting the carrier particles.Type: GrantFiled: April 30, 2019Date of Patent: June 30, 2020Assignee: KONICA MINOLTA, INC.Inventors: Futoshi Kadonome, Keiji Arai, Junichi Furukawa, Ikuko Sakurada
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Patent number: 10606183Abstract: Provided is an electrostatic latent image developing toner including toner mother particles having an external additive on a surface of the toner mother particles, wherein the external additive contains inorganic particles and aliphatic acid metal salt particles; the inorganic particles have a number average particle diameter in the range of 10 to 50 nm, and have a Mohs hardness of 8 or more; and the aliphatic acid metal salt particles have a number average particle diameter in the range of 0.4 to 2.0 ?m.Type: GrantFiled: February 6, 2019Date of Patent: March 31, 2020Assignee: KONICA MINOLTA, INC.Inventors: Koji Shibata, Takuya Takahashi, Futoshi Kadonome, Shinya Obara
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Publication number: 20190384201Abstract: Provided is an electrostatic charge image developer containing toner particles and carrier particles, wherein the toner particles contain at least silica particles or alumina particles as an external additive; the carrier particles contain core material particles and a coating resin layer covering a surface of the core particles; the coating resin layer contains metal oxide particles; an element measured by XPS (photoelectron spectroscopy) of the carrier particle is at least Si or Al; and a content of Si or Al in the carrier particle is in the range of 1 to 6 at % with respect to the total elements constituting the carrier particles.Type: ApplicationFiled: April 30, 2019Publication date: December 19, 2019Inventors: Futoshi KADONOME, Keiji ARAI, Junichi FURUKAWA, Ikuko SAKURADA
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Patent number: 10509338Abstract: Provided is a two-component developer for developing an electrostatic latent image containing: toner particles having toner mother particles and an external additive on a surface of the toner mother particles; and carrier particles, wherein the external additive contains alumina particles; the alumina particles are subjected to a surface modification with a hydrophobilizing agent; among the hydrophobilizing agent existing on the surface of the alumina particles after the surface modification, a ratio of the hydrophobilizing agent in a state of being liberated from the surface is 20% or less when extraction treatment is performed under a predetermined condition; the alumina particles have a number average primary particle diameter in the range of 5 to 60 nm; and the carrier particles have a resin covering layer, and the resin covering layer is formed with an alicyclic (meth)acrylate monomer.Type: GrantFiled: December 10, 2018Date of Patent: December 17, 2019Assignee: KONICA MINOLTA, INC.Inventors: Ikuko Sakurada, Satoshi Uchino, Shinya Obara, Futoshi Kadonome, Keiji Arai
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Publication number: 20190278192Abstract: Provided is an electrostatic latent image developing toner including toner mother particles having an external additive on a surface of the toner mother particles, wherein the external additive contains inorganic particles and aliphatic acid metal salt particles; the inorganic particles have a number average particle diameter in the range of 10 to 50 nm, and have a Mohs hardness of 8 or more; and the aliphatic acid metal salt particles have a number average particle diameter in the range of 0.4 to 2.0 ?m.Type: ApplicationFiled: February 6, 2019Publication date: September 12, 2019Inventors: Koji Shibata, Takuya Takahashi, Futoshi Kadonome, Shinya Obara
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Publication number: 20190243272Abstract: Provided is a two-component developer for developing an electrostatic latent image containing: toner particles having toner mother particles and an external additive on a surface of the toner mother particles; and carrier particles, wherein the external additive contains alumina particles; the alumina particles are subjected to a surface modification with a hydrophobilizing agent; among the hydrophobilizing agent existing on the surface of the alumina particles after the surface modification, a ratio of the hydrophobilizing agent in a state of being liberated from the surface is 20% or less when extraction treatment is performed under a predetermined condition; the alumina particles have a number average primary particle diameter in the range of 5 to 60 nm; and the carrier particles have a resin covering layer, and the resin covering layer is formed with an alicyclic (meth)acrylate monomerType: ApplicationFiled: December 10, 2018Publication date: August 8, 2019Inventors: Ikuko SAKURADA, Satoshi Uchino, Shinya Obara, Futoshi Kadonome, Keiji Arai
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Patent number: 10338489Abstract: The present invention provides a two-component developer for developing an electrostatic charge image, which includes a toner and a carrier, wherein the toner contains an amorphous resin and a crystalline resin as binder resins and an inorganic particle as external additive particle, and the carrier has a surface to which silica particles having a number average particle diameter of 10 to 30 nm are attached in an amount in the range of the following Equation (1): 5 at %?S1?10 at %, wherein S1 represents a concentration of Si element as measured by XPS and indicates an amount of silica on the surface of the carrier.Type: GrantFiled: May 10, 2018Date of Patent: July 2, 2019Assignee: KONICA MINOLTA, INC.Inventors: Futoshi Kadonome, Keiji Arai, Junichi Furukawa
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Patent number: 10168630Abstract: A toner for developing electrostatic images, including toner particles containing an external additive on surfaces of toner matrix particles. The external additive contains at least a lanthanum-containing titanate compound.Type: GrantFiled: March 9, 2018Date of Patent: January 1, 2019Assignee: KONICA MINOLTA, INC.Inventors: Satoshi Uchino, Shinya Obara, Futoshi Kadonome
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Publication number: 20180364602Abstract: The present invention provides a two-component developer for developing an electrostatic charge image, which includes a toner and a carrier, wherein the toner contains an amorphous resin and a crystalline resin as binder resins and an inorganic particle as external additive particle, and the carrier has a surface to which silica particles having a number average particle diameter of 10 to 30 nm are attached in an amount in the range of the following Equation (1): 5 at %?S1?10 at %, wherein S1 represents a concentration of Si element as measured by XPS and indicates an amount of silica on the surface of the carrier.Type: ApplicationFiled: May 10, 2018Publication date: December 20, 2018Inventors: Futoshi KADONOME, Keiji ARAI, Junichi FURUKAWA
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Patent number: 10156803Abstract: Provided is a carrier for electrostatic charge image development which provides a two-component developer having a high electric charge amount, a suppressed variation in an electric charge amount caused by an environmental change, and excellent durability, even if a low temperature fixable toner is used. A carrier for electrostatic charge image development of the present invention includes: carrier particles in which a core particle surface is coated with a coating material containing a resin, wherein the coating material contains phosphorus element, and the resin contains structural units derived from an alicyclic (meth)acrylic acid ester compound.Type: GrantFiled: April 28, 2017Date of Patent: December 18, 2018Assignee: Konica Minolta, Inc.Inventors: Kosuke Nakamura, Satoshi Uchino, Futoshi Kadonome, Koji Shibata
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Publication number: 20180267416Abstract: A toner for developing electrostatic images, including toner particles containing an external additive on surfaces of toner matrix particles. The external additive contains at least a lanthanum-containing titanate compound.Type: ApplicationFiled: March 9, 2018Publication date: September 20, 2018Inventors: Satoshi UCHINO, Shinya OBARA, Futoshi KADONOME
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Patent number: 9946180Abstract: A toner for developing an electrostatic latent image includes: toner base particles containing a hybrid crystalline polyester resin having a crystalline polyester polymerized segment and an amorphous polymerized segment chemically bonded to each other and an amorphous resin; and an external additive including fatty acid metal salt particles, wherein a volume median diameter of the fatty acid metal salt particles is from 3.0 to 5.0 ?m.Type: GrantFiled: March 28, 2017Date of Patent: April 17, 2018Assignee: KONICA MINOLTA, INC.Inventors: Futoshi Kadonome, Satoshi Uchino, Kosuke Nakamura, Koji Shibata
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Patent number: 9915884Abstract: The toner of the present invention contains: a toner base particle, and a silica particle and a fatty acid metal salt particle adhering to a surface of the toner base particle. The toner base particle contains a crystalline polyester resin and an amorphous polyester resin. The toner particle has an average circularity of 0.945 to 0.965. The silica particle has a volume average particle size of 70 to 300 nm, and has an average circularity of 0.5 to 0.9. The fatty acid metal salt particle has a median diameter based on a volume of 0.50 to 2.00 ?m.Type: GrantFiled: September 23, 2016Date of Patent: March 13, 2018Assignee: KONICA MINOLTA, INC.Inventors: Satoshi Uchino, Shinya Obara, Futoshi Kadonome, Noriyuki Kimpara, Ikuko Sakurada, Takuya Takahashi
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Patent number: 9904194Abstract: An electrostatic latent image developing toner of the present invention includes toner base particles and particles containing a fatty acid metal salt. The toner base particles contain a crystalline resin containing a segment of a first resin and a segment of a second resin chemically bonded to each other and an amorphous resin containing at least the second resin. The crystalline resin is a hybrid crystalline polyester resin. The first resin is a crystalline polyester resin. The second resin is an amorphous resin. The volume-based median diameter (Da) of the toner base particles and the volume-based median diameter (Db) of the particles containing the fatty acid metal salt satisfy the relations represented by Expressions (1) and (2) below: 0.5 ?m?Db?2.0 ?m??Expression (1) 0.1 Db/Da?0.5.Type: GrantFiled: September 30, 2016Date of Patent: February 27, 2018Assignee: KONICA MINOLTA, INC.Inventors: Noriyuki Kimpara, Satoshi Uchino, Shinya Obara, Futoshi Kadonome, Ikuko Sakurada, Takuya Takahashi
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Patent number: 9823596Abstract: Provided is an electrostatic image developing toner including a toner mother particle containing a colorant and a binder resin comprising a crystalline resin and an amorphous resin; and an external additive. The external additive includes an inorganic fine particle having a number average major axis in a range of 50 to 100 nm, an average aspect ratio in a range of 3 to 10, and a volume resistivity in a range of 1×1010 to 1×1012 ?·cm in primary particles.Type: GrantFiled: September 16, 2016Date of Patent: November 21, 2017Assignee: KONICA MINOLTA, INC.Inventors: Futoshi Kadonome, Satoshi Uchino, Shinya Obara, Noriyuki Kimpara, Ikuko Sakurada, Takuya Takahashi
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Publication number: 20170329248Abstract: Provided is a carrier for electrostatic charge image development which provides a two-component developer having a high electric charge amount, a suppressed variation in an electric charge amount caused by an environmental change, and excellent durability, even if a low temperature fixable toner is used. A carrier for electrostatic charge image development of the present invention includes: carrier particles in which a core particle surface is coated with a coating material containing a resin, wherein the coating material contains phosphorus element, and the resin contains structural units derived from an alicyclic (meth)acrylic acid ester compound.Type: ApplicationFiled: April 28, 2017Publication date: November 16, 2017Inventors: Kosuke NAKAMURA, Satoshi UCHINO, Futoshi KADONOME, Koji SHIBATA
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Publication number: 20170307991Abstract: A toner for developing an electrostatic latent image includes: toner base particles containing a hybrid crystalline polyester resin having a crystalline polyester polymerized segment and an amorphous polymerized segment chemically bonded to each other and an amorphous resin; and an external additive including fatty acid metal salt particles, wherein a volume median diameter of the fatty acid metal salt particles is from 3.0 to 5.0 ?m.Type: ApplicationFiled: March 28, 2017Publication date: October 26, 2017Inventors: Futoshi KADONOME, Satoshi Uchino, Kosuke Nakamura, Koji Shibata
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Patent number: 9746818Abstract: A process of forming an image includes the steps of: developing an electrostatic latent image with a toner, the latent image being formed through charge of the surface of an electrostatic latent image carrier and exposure of the surface to light; and applying a lubricant onto the surface of the electrostatic latent image carrier. The toner includes a toner matrix particle and an external additive nanoparticle. The external additive nanoparticle comprises a silica-polymer composite nanoparticle. A percentage of atomic silicon present on the surface of the silica-polymer composite nanoparticle satisfies Condition A expressed by Expression: 15.0 atm %?percentage of atomic silicon ({Si/(C+O+Si)}×100)?30.0 atm %. The percentage of atomic silicon is determined from total amounts of atomic carbon, oxygen, and silicon present on the topmost surface of the silica-polymer composite nanoparticle and within 3 nm inwards from the topmost surface.Type: GrantFiled: April 10, 2015Date of Patent: August 29, 2017Assignee: KONICA MINOLTA, INC.Inventors: Satoshi Uchino, Kosuke Nakamura, Futoshi Kadonome, Koji Shibata
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Publication number: 20170123332Abstract: The toner of the present invention contains: a toner base particle, and a silica particle and a fatty acid metal salt particle adhering to a surface of the toner base particle. The toner base particle contains a crystalline polyester resin and an amorphous polyester resin. The toner particle has an average circularity of 0.945 to 0.965. The silica particle has a volume average particle size of 70 to 300 nm, and has an average circularity of 0.5 to 0.9. The fatty acid metal salt particle has a median diameter based on a volume of 0.50 to 2.00 ?m.Type: ApplicationFiled: September 23, 2016Publication date: May 4, 2017Inventors: Satoshi UCHINO, Shinya OBARA, Futoshi KADONOME, Noriyuki KIMPARA, Ikuko SAKURADA, Takuya TAKAHASHI
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Publication number: 20170123334Abstract: An electrostatic latent image developing toner of the present invention includes toner base particles and particles containing a fatty acid metal salt. The toner base particles contain a crystalline resin containing a segment of a first resin and a segment of a second resin chemically bonded to each other and an amorphous resin containing at least the second resin. The crystalline resin is a hybrid crystalline polyester resin. The first resin is a crystalline polyester resin. The second resin is an amorphous resin. The volume-based median diameter (Da) of the toner base particles and the volume-based median diameter (Db) of the particles containing the fatty acid metal salt satisfy the relations represented by Expressions (1) and (2) below: 0.5 ?m?Db?2.0 ?m??Expression (1) 0.1 Db/Da?0.5.Type: ApplicationFiled: September 30, 2016Publication date: May 4, 2017Inventors: Noriyuki KIMPARA, Satoshi UCHINO, Shinya OBARA, Futoshi KADONOME, Ikuko SAKURADA, Takuya TAKAHASHI