公开(公告)号：US20180267421A1

公开(公告)日：2018-09-20

申请号：US15911443

申请日：2018-03-05

申请人： Mariko TAKII ,  Koichi SAKATA ,  Tohru SUGANUMA ,  Masahiro SEKI ,  Masashi NAGAYAMA ,  Toyoaki TANO ,  Kohsuke MIYAZAKI

发明人： Mariko TAKII ,  Koichi SAKATA ,  Tohru SUGANUMA ,  Masahiro SEKI ,  Masashi NAGAYAMA ,  Toyoaki TANO ,  Kohsuke MIYAZAKI

IPC分类号： G03G9/00 ,  G03G9/107 ,  G03G9/113

CPC分类号： G03G9/1075 ,  G03G9/1131 ,  G03G9/1133 ,  G03G9/1134 ,  G03G9/1135 ,  G03G9/1136 ,  G03G9/1139 ,  G03G15/08 ,  G03G15/0853 ,  G03G15/556

摘要： A carrier is provided including a core particle and a resin layer coating the surface of the core particle. The resin layer includes fine metal particles, and a detected metal element amount A obtained by X-ray photoelectron spectrometry of the surface of the carrier is in a range of 4.0 atomic %≤A≤20.0 atomic % and an average major-axis length B of the fine metal particle exposing from the resin layer is in a range of 100 nm≤B≤800 nm.

公开(公告)号：US20180113393A1

公开(公告)日：2018-04-26

申请号：US15730795

申请日：2017-10-12

申请人： Masahiro SEKI ,  Hiroyuki Kishida ,  Haruki Murata ,  Shinya Nakagawa ,  Kei Niwayama ,  Saori Yamada ,  Kohsuke Miyazaki

发明人： Masahiro SEKI ,  Hiroyuki Kishida ,  Haruki Murata ,  Shinya Nakagawa ,  Kei Niwayama ,  Saori Yamada ,  Kohsuke Miyazaki

IPC分类号： G03G9/113 ,  G03G9/107

CPC分类号： G03G9/1131 ,  G03G9/1075 ,  G03G9/1132 ,  G03G9/1139 ,  G03G15/0806

摘要： A carrier for a developer of an electrostatic latent image, the carrier including: core particles having magnetism; and a coating layer coating a surface of each of the core particles, wherein the coating layer includes two or more kinds of inorganic particles, at least one kind of inorganic particles among the two or more kinds of inorganic particles is inorganic particles A having conductivity and a peak particle diameter of from 300 nm through 1,000 nm, and surface roughness of the carrier calculated by Formula 1 below is from 1.10 m2/g through 1.90 m2/g, C−F  Formula 1 where C is a BET specific surface area (m2/g) of the carrier and F is a BET specific surface area (m2/g) of the core particles.

公开(公告)号：US20200166867A1

公开(公告)日：2020-05-28

申请号：US16683534

申请日：2019-11-14

申请人： Masashi NAGAYAMA ,  Hiroyuki KISHIDA ,  Masahiro SEKI ,  Yoshimichi ISHIKAWA ,  Saori YAMADA

发明人： Masashi NAGAYAMA ,  Hiroyuki KISHIDA ,  Masahiro SEKI ,  Yoshimichi ISHIKAWA ,  Saori YAMADA

IPC分类号： G03G15/08

摘要： A carrier for forming an electrophotographic image is provided. The carrier includes a core particle comprising a manganese-based ferrite particle having an apparent density of from 2.0 to 2.2 g/cm3 and a magnetization of from 44 to 52 emu/g in a magnetic field of 500 Oe; and a coating layer coating a surface of the core particle. The coating layer contains a carbon black, an inorganic particle A, and an inorganic particle B. The inorganic particle A and the carbon black each have a concentration gradient in a thickness direction of the coating layer. A concentration of the inorganic particle A increases toward a surface of the coating layer, and a concentration of the carbon black decreases toward the surface of the coating layer.

公开(公告)号：US20190011847A1

公开(公告)日：2019-01-10

申请号：US16131538

申请日：2018-09-14

申请人： Satoshi OGAWA ,  Masahiro SEKI ,  Yoshitaka SEKIGUCHI ,  Tohru MORIYA

发明人： Satoshi OGAWA ,  Masahiro SEKI ,  Yoshitaka SEKIGUCHI ,  Tohru MORIYA

IPC分类号： G03G9/097 ,  G03G9/087

摘要： Provided is a toner including a binder resin, wherein the toner includes a THF-insoluble component in an amount of from 10% by mass through 40% by mass, a molecular weight distribution of a THF-soluble component of the toner measured by gel permeation chromatography (GPC) has a main peak between 10,000 and 16,000, and a half value width of the main peak is a molecular weight of from 60,000 through 90,000, and the THF-soluble component of the toner includes a component having a molecular weight of 2,000 or less in an amount of from 15.0% by mass through 25.0% by mass, and a component having a molecular weight of 100,000 or greater in an amount of 10.0% by mass or less as measured by GPC.

公开(公告)号：US20180031992A1

公开(公告)日：2018-02-01

申请号：US15557362

申请日：2016-02-29

申请人： Masahiro SEKI ,  Yoshitaka SEKIGUCHI ,  Satoshi OGAWA ,  Naoko KITADA

发明人： Masahiro SEKI ,  Yoshitaka SEKIGUCHI ,  Satoshi OGAWA ,  Naoko KITADA

IPC分类号： G03G9/087 ,  G03G9/09

CPC分类号： G03G9/08797 ,  G03G9/08755 ,  G03G9/08782 ,  G03G9/08795 ,  G03G9/0904 ,  G03G9/091

摘要： A toner including a binder resin, wherein the toner includes a tetrahydrofuran (THF)-insoluble component in a range of from 10% by mass through 40% by mass, wherein the toner has a main peak in a range of from 12,000 through 18,000 in a molecular weight distribution of a THF-soluble component as measured by gel permeation chromatography (GPC), wherein the main peak has a half value width in a range of from 20,000 to 50,000, and wherein the toner includes a component having a molecular weight of 2,000 or less in a range of from 10.0% by mass through 20.0% by mass and a component having a molecular weight of 100,000 or more of 8.0% by mass or less.