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公开(公告)号：US10241432B2
公开(公告)日：2019-03-26
申请号：US15787033
申请日：2017-10-18
Applicant: Konica Minolta, Inc.
Inventor： Shinya Obara , Satoshi Uchino , Junya Ueda , Takuya Takahashi
Abstract: An electrostatically charged image developing toner includes a particulate toner matrix containing an external additive on the surface of the particulate toner matrix. The external additive includes silica particles A and silica particles B. The silica particles A have a number average primary-particle diameter in the range of 40 to 100 nm and an average circularity in the range of 0.50 to 0.90, and are surface-modified with silicone oil. The silica particles B have a number average primary-particle diameter of 25 nm or more and smaller than the number average primary-particle diameter of the silica particles A, and are surface-modified with alkylalkoxysilane having a specific structure or silazane.
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公开(公告)号：US10234778B2
公开(公告)日：2019-03-19
申请号：US15699394
申请日：2017-09-08
Applicant: Konica Minolta, Inc.
Inventor： Satoshi Uchino , Shinya Obara , Junya Ueda , Takuya Takahashi
Abstract: An electrostatic charge image developing toner includes toner particles including a particulate toner matrix and an external additive adhering to a surface of the particulate toner matrix. The particulate toner matrix includes a crystalline polyester resin. The external additive includes silica particles. The silica particles are secondary particles including primary particles having a diameter in the range of 30 to 90 nm. The secondary particles have an average circularity in the range of 0.25 to 0.50. The secondary particles have an average aspect ratio of 3.0 or more.
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13.发明申请公开(公告)号：US20180120721A1
公开(公告)日：2018-05-03
申请号：US15787033
申请日：2017-10-18
Applicant: Konica Minolta, Inc.
Inventor： Shinya Obara , Satoshi Uchino , Junya Ueda , Takuya Takahashi
CPC classification number: G03G9/08797 , G03G9/0823 , G03G9/0833 , G03G9/08755 , G03G9/08795 , G03G9/09708 , G03G9/09716 , G03G9/09725
Abstract: An electrostatically charged image developing toner includes a particulate toner matrix containing an external additive on the surface of the particulate toner matrix. The external additive includes silica particles A and silica particles B. The silica particles A have a number average primary-particle diameter in the range of 40 to 100 nm and an average circularity in the range of 0.50 to 0.90, and are surface-modified with silicone oil. The silica particles B have a number average primary-particle diameter of 25 nm or more and smaller than the number average primary-particle diameter of the silica particles A, and are surface-modified with alkylalkoxysilane having a specific structure or silazane.
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公开(公告)号：US20180074421A1
公开(公告)日：2018-03-15
申请号：US15699394
申请日：2017-09-08
Applicant: Konica Minolta, Inc.
Inventor： Satoshi UCHINO , Shinya Obara , Junya Ueda , Takuya Takahashi
CPC classification number: G03G9/08755 , G03G9/0821 , G03G9/0825 , G03G9/0827 , G03G9/08711 , G03G9/09328 , G03G9/09371 , G03G9/09378 , G03G9/09385 , G03G9/09716 , G03G9/09725
Abstract: An electrostatic charge image developing toner includes toner particles including a particulate toner matrix and an external additive adhering to a surface of the particulate toner matrix. The particulate toner matrix includes a crystalline polyester resin. The external additive includes silica particles. The silica particles are secondary particles including primary particles having a diameter in the range of 30 to 90 nm. The secondary particles have an average circularity in the range of 0.25 to 0.50. The secondary particles have an average aspect ratio of 3.0 or more.
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公开(公告)号：US09482977B2
公开(公告)日：2016-11-01
申请号：US14990409
申请日：2016-01-07
Applicant: Konica Minolta, Inc.
Inventor： Shinya Obara , Satoshi Uchino , Kosuke Nakamura
CPC classification number: G03G9/1132 , G03G9/0819 , G03G9/0827
Abstract: Disclosed is a two-component developer containing toner particles and carrier particles. The number-average particle diameter of the toner particles MDt ranges from 3.5 to 5.0 μm. The MDt of the toner particles and the volume-average particle diameter of the carrier particles MDc are at a specific ratio, and spherical fine toner particles in the toner particles and fine carrier particles in the carrier particles exist at specific percentages.
Abstract translation: 公开了含有调色剂颗粒和载体颗粒的双组分显影剂。 调色剂颗粒MDt的数均粒径为3.5-5.0μm。 调色剂颗粒的MDt和载体颗粒MDc的体积平均粒径为特定比例，并且调色剂颗粒中的球形微调色剂颗粒和载体颗粒中的细载体颗粒以特定百分比存在。
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Patent Agency Ranking
公开(公告)号：US09470992B2
公开(公告)日：2016-10-18
申请号：US14628831
申请日：2015-02-23
Applicant: Konica Minolta, Inc.
Inventor： Satoshi Uchino , Shinya Obara , Yasuko Uchino , Ikuko Sakurada
CPC classification number: G03G9/0819 , G03G9/0825 , G03G9/0827 , G03G9/08711 , G03G9/08755 , G03G9/09716 , G03G9/09725
Abstract: An image forming method includes: charging a surface of an electrostatic latent image holder with a charging roller; exposing the charged surface so as to form an electrostatic latent image; and developing the formed electrostatic latent image with toner. The toner contains at least a toner base particle and an external additive minute particle. The external additive minute particle contains a silica-polymer composite minute particle. A silicon atom abundance ratio obtained from abundances of a carbon atom, an oxygen atom and a silicon atom present on an outermost surface and within 3 nm from the outermost surface in a depth direction of the silica-polymer composite minute particle are measured with an x-ray photoelectron spectrometer satisfies at least the following condition A. 15.0 atm %≦silicon atom abundance ratio ({Si/(C+O+Si)}×100)≦30.0 atm % [Condition A]
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公开(公告)号：US10698331B2
公开(公告)日：2020-06-30
申请号：US16404179
申请日：2019-05-06
Applicant: Konica Minolta, Inc.
Inventor： Shinya Obara , Koji Shibata , Junya Ueda , Takuya Takahashi , Satoshi Uchino
Abstract: To provide a two-component developer for electrostatic charge image development, the two-component developer enabling a high image quality to be kept and enabling the occurrence of fogging to be suppressed even in continuous printing of an image high in coverage rate. The two-component developer for electrostatic charge image development includes a toner particle including a toner base particle and an external additive disposed on the surface of the toner base particle, and a carrier particle including a core material particle and a covering section disposed on the surface of the core material particle, wherein the external additive includes an alumina particle, and the percentage of exposed area of the core material particle is 4.0% or more and 15.0% or less.
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公开(公告)号：US10585368B2
公开(公告)日：2020-03-10
申请号：US16194631
申请日：2018-11-19
Applicant: Konica Minolta, Inc.
Inventor： Junya Ueda , Shinya Obara , Takuya Takahashi , Ikuko Sakurada , Satoshi Uchino
Abstract: Provided is an electrostatic image developing toner containing toner mother particles having external additives on a surface of the mother particle, wherein the external additives contains calcium titanate particles having an average primary particle size in the range of 50 to 150 nm, and alumina particles; and an average primary particle size of the alumina particles is less than the average primary particle size of the calcium titanate particles.
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公开(公告)号：US10509338B2
公开(公告)日：2019-12-17
申请号：US16214859
申请日：2018-12-10
Applicant: Konica Minolta, Inc.
Inventor： Ikuko Sakurada , Satoshi Uchino , Shinya Obara , Futoshi Kadonome , Keiji Arai
Abstract: 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.
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公开(公告)号：US20190243272A1
公开(公告)日：2019-08-08
申请号：US16214859
申请日：2018-12-10
Applicant: Konica Minolta, Inc.
Inventor： Ikuko SAKURADA , Satoshi Uchino , Shinya Obara , Futoshi Kadonome , Keiji Arai
Abstract: 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
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