公开(公告)号：US09952524B2

公开(公告)日：2018-04-24

申请号：US14404543

申请日：2013-05-30

Applicant: TODA KOGYO CORP.

Inventor： Kaori Kinoshita ,  Eiichi Kurita

IPC: G03G9/113 ,  G03G9/107 ,  G03G9/10

CPC classification number: G03G9/1135 ,  G03G9/10 ,  G03G9/107 ,  G03G9/1075 ,  G03G9/1131 ,  G03G9/1133 ,  G03G9/1136

Abstract: The present invention relates to a magnetic carrier for an electrophotographic developer comprising spherical composite core particles comprising at least ferromagnetic iron oxide fine particles and a cured phenol resin, and having an average particle diameter of 20 to 60 μm, the magnetic carrier for an electrophotographic developer satisfying the formula (1): σ1−σ0=−2 to 0 wherein σ0 represents a saturation magnetization (Am2/kg) of the carrier particles having a particle diameter in the vicinity of the average particle diameter of the magnetic carrier for an electrophotographic developer; and σ1 represents a saturation magnetization (Am2/kg) of the carrier particles having a particle diameter of less than 20 μm, and a two-component system developer using the magnetic carrier. The two-component system developer of the present invention includes a magnetic carrier used for an electrophotographic developer which can exhibit a good durability, is free from occurrence of carrier adhesion, and can maintain a high quality of images produced for a long period of time, and comprises the magnetic carrier for an electrophotographic developer and a toner.

公开(公告)号：US09823596B2

公开(公告)日：2017-11-21

申请号：US15267808

申请日：2016-09-16

Applicant: Konica Minolta, Inc.

Inventor： Futoshi Kadonome ,  Satoshi Uchino ,  Shinya Obara ,  Noriyuki Kimpara ,  Ikuko Sakurada ,  Takuya Takahashi

IPC: G03G9/097 ,  G03G9/08 ,  G03G9/087 ,  G03G9/09 ,  G03G9/113

CPC classification number: G03G9/09783 ,  G03G9/0819 ,  G03G9/08711 ,  G03G9/08755 ,  G03G9/0918 ,  G03G9/09716 ,  G03G9/09725 ,  G03G9/113 ,  G03G9/1133

Abstract: 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 Ω·cm in primary particles.

公开(公告)号：US20170315459A1

公开(公告)日：2017-11-02

申请号：US15335972

申请日：2016-10-27

Applicant: FUJI XEROX CO., LTD.

Inventor： Moegi IGUCHI ,  Sakon TAKAHASHI ,  Takeshi TANABE ,  Hiroshi KAMADA ,  Yasuaki HASHIMOTO ,  Masaaki USAMI ,  Yuka ZENITANI ,  Yuta SAEKI ,  Hiroaki SAIJO

IPC: G03G9/08 ,  G03G9/113 ,  G03G9/09 ,  G03G9/087 ,  G03G15/08 ,  G03G9/107

CPC classification number: G03G9/0819 ,  G03G9/0808 ,  G03G9/0827 ,  G03G9/08755 ,  G03G9/08795 ,  G03G9/08797 ,  G03G9/0918 ,  G03G9/09716 ,  G03G9/09725 ,  G03G9/09791 ,  G03G9/1075 ,  G03G9/1133 ,  G03G15/0865

Abstract: An electrostatic charge image developing toner includes: toner particles; first silica particles having an average circularity of 0.9 to 1.0, a particle size distribution index of 1.05 to 1.25, and a compression aggregation degree of 60% to 95%; and second silica particles having an average circularity of 0.9 to 1.0, a particle size distribution index of 1.05 to 1.25, and a compression aggregation degree of 60% to 95%, wherein, when an average primary particle diameter of the first silica particles is set as Da (nm) and an average primary particle diameter of the second silica particles is set as Db (nm), relationships of the following Expressions (A1) to (A3) are satisfied: Expression (A1): 80≦Da≦120, Expression (A2): 120≦Db≦200, and Expression (A3): 10≦Db−Da≦120.

公开(公告)号：US09798264B2

公开(公告)日：2017-10-24

申请号：US15283787

申请日：2016-10-03

Applicant: Konica Minolta, Inc.

Inventor： Kosuke Nakamura ,  Satoshi Uchino ,  Koji Shibata

IPC: G03G9/113 ,  C09D133/12 ,  C09D133/10

CPC classification number: G03G9/1131 ,  C09D133/10 ,  C09D133/12 ,  G03G9/1133

Abstract: Provided is a method for producing a carrier for developing an electrostatic latent image, the carrier including carrier particles each including a core particle with a surface coated with a coating material including a resin, and the method including the steps of: a) obtaining first coating resin particles by polymerizing an alicyclic methacrylate monomer using, as a polymerization initiator, an azo compound having a nitrogen atom-containing substituent; b) obtaining second coating resin particles by polymerizing an alicyclic methacrylate monomer using a persulfate as a polymerization initiator; and c) forming carrier particles by coating surfaces of core particles with a coating material obtained by mixing at least the first and second coating resin particles.

公开(公告)号：US09778586B2

公开(公告)日：2017-10-03

申请号：US14111587

申请日：2012-04-12

Applicant: Kaori Kinoshita ,  Eiichi Kurita

Inventor： Kaori Kinoshita ,  Eiichi Kurita

IPC: G03G9/113 ,  G03G9/107 ,  G03G9/08

CPC classification number: G03G9/107 ,  G03G9/0804 ,  G03G9/1075 ,  G03G9/113 ,  G03G9/1133 ,  G03G9/1135 ,  G03G9/1136

Abstract: The present invention provides a magnetic carrier for an electrophotographic developer which has an excellent durability and a stable charging property and is free from occurrence of spent toner thereonto, and a two-component system developer comprising the magnetic carrier for an electrophotographic developer and a toner. The present invention relates to a core material of a magnetic carrier for an electrophotographic developer comprising spherical composite particles comprising at least ferromagnetic iron oxide fine particles and a cured phenol resin and having an average particle diameter of 1 to 100 μm, a resin index of the spherical composite particles being within the range of 35 to 80%, and a magnetic carrier obtained by coating a surface of respective particles of the magnetic carrier core material with a resin.

公开(公告)号：US20170160664A1

公开(公告)日：2017-06-08

申请号：US15434300

申请日：2017-02-16

Applicant: TODA KOGYO CORPORATION

Inventor： Katsuji IWAMI ,  Shigenori HARADA ,  Eiichi KURITA ,  Kaori KINOSHITA

IPC: G03G9/107 ,  G03G9/09 ,  G03G9/087 ,  G03G9/113 ,  G03G9/08

CPC classification number: G03G9/1075 ,  G03G9/0819 ,  G03G9/0827 ,  G03G9/08755 ,  G03G9/0918 ,  G03G9/107 ,  G03G9/1131 ,  G03G9/1133 ,  G03G9/1134 ,  G03G9/1135 ,  G03G9/1136

Abstract: The present invention relates to a magnetic carrier for an electrophotographic developer comprising spherical magnetic composite particles comprising a phenol resin as a binder and ferromagnetic iron oxide particles bonded to each other through the phenol resin, wherein the spherical magnetic composite particles have a ten-point mean roughness Rz of 0.3 to 2.0 μm. The magnetic carrier for an electrophotographic developer according to the present invention exhibits an excellent durability against peeling-off and abrasion of coating resins formed thereon and a high stability to mechanical stress exerted onto the carrier, is free from occurrence of spent toner, can be stably held over a long period of time without occurrence of fogging and unevenness in density of toner images, and can keep high-quality images with an excellent gradation for a long period of time.

公开(公告)号：US20170060012A1

公开(公告)日：2017-03-02

申请号：US15014395

申请日：2016-02-03

Applicant: FUJI XEROX CO., LTD.

Inventor： Hiroshi KAMADA

IPC: G03G9/087 ,  G03G9/107 ,  G03G9/08 ,  G03G21/18

CPC classification number: G03G9/08755 ,  G03G9/0825 ,  G03G9/08711 ,  G03G9/1133 ,  G03G21/1814

Abstract: An electrostatic charge image developer includes an electrostatic charge image developing toner including toner particles and an external additive, and a carrier, wherein the toner particle contains a polyester resin and a styrene (meth)acrylic resin and includes domains of the styrene (meth)acrylic resin having an average diameter of 300 nm to 800 nm, and the carrier includes a magnetic particle dispersed core particle and a (meth)acrylic resin which contains a nitrogen atom on the surface of the core particle.

Abstract translation: 静电荷图像显影剂包括具有调色剂颗粒和外部添加剂的静电电荷图像显影调色剂和载体，其中调色剂颗粒含有聚酯树脂和苯乙烯（甲基）丙烯酸树脂，并且包括苯乙烯（甲基）丙烯酸 平均直径为300nm〜800nm的树脂，载体包括磁芯颗粒分散芯颗粒和在芯颗粒表面含有氮原子的（甲基）丙烯酸树脂。

公开(公告)号：US09557676B2

公开(公告)日：2017-01-31

申请号：US14586420

申请日：2014-12-30

Applicant: FUJI XEROX CO., LTD.

Inventor： Yosuke Tsurumi ,  Shintaro Anno

IPC: G03G9/107 ,  G03G9/113

CPC classification number: G03G9/107 ,  G03G9/113 ,  G03G9/1133 ,  G03G9/1139

Abstract: An electrostatic charge image developing carrier includes magnetic particles, wherein the magnetic particles have an unevenness average Sm of a surface, an arithmetic surface roughness Ra of a surface, a BET specific surface area A, and a volume average particle diameter D50v satisfying the following expressions (1) to (4): 0.5 μm≦Sm≦2.5 μm  (1) 0.3 μm≦Ra≦1.2 μm  (2) 0.14 m2/g≦A≦0.20 m2/g  (3) 18 μm≦D50v≦32 μm.  (4)

Abstract translation: 静电荷图像显影载体包括磁性颗粒，其中磁性颗粒具有表面的不均匀平均Sm，表面的算术表面粗糙度Ra，BET比表面积A和满足以下表达式的体积平均粒径D50v （1）〜（4）：0.5μm＆nlE; Sm＆nlE;2.5μm（1）0.3μm＆lt; lE; Ra＆nlE1.2μm（2）0.14m 2 / g＆lt; N＆amp; A＆amp; NlE; 0.20m 2 / g（3）18μm＆nlE; D50v＆nlE;32μm。 （4）

公开(公告)号：US09513570B2

公开(公告)日：2016-12-06

申请号：US14526696

申请日：2014-10-29

Applicant: FUJI XEROX CO., LTD.

Inventor： Takeshi Shoji ,  Yosuke Tsurumi ,  Hiroshi Kamada

IPC: G03G9/00 ,  G03G9/097 ,  G03G9/113 ,  G03G15/22 ,  G03G15/08 ,  G03G9/08

CPC classification number: G03G9/09708 ,  G03G9/0819 ,  G03G9/1133 ,  G03G15/08 ,  G03G15/22 ,  G03G2221/183

Abstract: An electrostatic charge image developer contains toner including toner particles, and strontium titanate particles having a volume average particle diameter of 3 μm to 7 μm. The electrostatic charge image developer also contains a carrier including core particle, and a coating layer that coats the core particle and contains a cyclohexyl methacrylate resin.

Abstract translation: 静电荷图像显影剂含有包含调色剂颗粒的调色剂和体积平均粒径为3μm至7μm的钛酸锶颗粒。 静电荷图像显影剂还含有包含核心颗粒的载体和包覆核心颗粒并含有甲基丙烯酸环己酯树脂的涂层。

公开(公告)号：US09500975B2

公开(公告)日：2016-11-22

申请号：US14631805

申请日：2015-02-25

Applicant: CANON KABUSHIKI KAISHA

Inventor： Nobuyoshi Sugahara ,  Hironori Minagawa ,  Yuto Onozaki ,  Minoru Yoshifuku ,  Wakashi Iida

IPC: G03G9/08 ,  G03G9/107 ,  G03G9/113

CPC classification number: G03G9/1075 ,  G03G9/113 ,  G03G9/1133

Abstract: Provided is a magnetic carrier, including magnetic carrier particles each including: a magnetic carrier core including a magnetic material and a resin; and a resin coating layer formed on a surface of the magnetic carrier core, in which: the resin included in the magnetic carrier core has a hydroxy group; a surface portion of the magnetic carrier core includes a specific compound; and the magnetic carrier has an adsorbed moisture amount of 0.40 mass % or less when the magnetic carrier is left to stand in an environment of a temperature of 30° C. and a humidity of 80% RH for 72 hours.

Abstract translation: 提供一种磁性载体，包括磁性载体颗粒，每个磁性载体颗粒包括：包含磁性材料和树脂的磁性载体芯; 以及形成在所述磁性载体芯的表面上的树脂被覆层，其中：所述磁性载体芯中包含的树脂具有羟基; 磁性载体芯的表面部分包括特定的化合物; 磁性载体在温度30℃，湿度80％RH的环境下静置72小时时，磁性载体的吸附水分含量为0.40质量％以下。