公开(公告)号：US12153377B2

公开(公告)日：2024-11-26

申请号：US17399174

申请日：2021-08-11

Applicant: FUJIFILM Business Innovation Corp.

Inventor： Karin Sakai ,  Kazutsuna Sasaki ,  Yosuke Tsurumi ,  Yasuo Kadokura ,  Takuro Watanabe

IPC: G03G15/08 ,  G03G9/08 ,  G03G9/107 ,  G03G9/113 ,  G03G21/18

Abstract: An electrostatic charge image developer contains: a toner containing a toner particle and an external additive; and a carrier containing a magnetic particle and a resin layer covering the magnetic particle; and the toner particle has a surface property index value of 1.0 or more and less than 2.0; and the carrier has a surface having a ratio B/A of a surface area B to a plane view area A of 1.020 or more and 1.100 or less, the plane view area A and the surface area B being obtained by three-dimensional analysis of the surface of the carrier.

公开(公告)号：US20240329555A1

公开(公告)日：2024-10-03

申请号：US18576627

申请日：2022-03-31

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tamotsu SHIMIZU ,  Kohei TERASAKI ,  Yuma UCHIHASHI ,  Yusuke KURANO

IPC: G03G9/113 ,  G03G9/107

CPC classification number: G03G9/1139 ,  G03G9/1075 ,  G03G9/1131 ,  G03G9/1136

Abstract: In a two-component developer, external additive particles of toner particles include silica particles. The silica particles have a number average primary particle diameter of at least 30 nm and no greater than 120 nm. Coat layers of carrier particles contain a coating resin and barium titanate particles. The coating resin includes a silicone resin. The barium titanate particles have a number average primary particle diameter of at least 100 and no greater than 500 nm. The barium titanate particles have a content of at least 5 parts by mass and no greater than 45 parts by mass relative to 100 parts by mass of the coating resin. A rate of a mass of the coat layers to a mass of the carrier cores is at least 0.09% by mass and no greater than 4.90% by mass. A coverage rate of the carrier cores is at least 80.0% and less than 100.0%.

公开(公告)号：US20240319630A1

公开(公告)日：2024-09-26

申请号：US18453339

申请日：2023-08-22

Applicant: FUJIFILM Business Innovation Corp.

Inventor： Yosuke TSURUMI ,  Yasuo KADOKURA ,  Moegi IGUCHI

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

CPC classification number: G03G9/1133 ,  G03G9/0825 ,  G03G9/1085

Abstract: An electrostatic charge image developer contains a toner including toner particles that contain a binder resin and a carrier including magnetic particles and a resin layer that adheres to a surface of the magnetic particles, in which, in a dynamic viscoelasticity measurement of the toner, in a case where a loss tangent tanδ at a temperature of 90° C. and a strain of 1% is represented by D1 (90), a loss tangent tanδ at a temperature of 90° C. and a strain of 50% is represented by D50 (90), a loss tangent tanδ at a temperature of 150° C. and a strain of 1% is represented by D1 (150), and a loss tangent tanδ at a temperature of 150° C. and a strain of 50% is represented by D50 (150), each of D1 (90), D50 (90), D1 (150), and D50 (150) is 0.5 or more and 2.5 or less, a value of D50 (150)−D1 (150) is less than 1.5, and a value of D50 (90)−D1 (90) is less than 1.0, and in the surface of the magnetic particles, an average unevenness interval Sm and an arithmetic mean roughness Ra satisfy 0.5 μm≤ Sm≤2.5 μm and 0.3 μm≤ Ra≤1.2 μm.

公开(公告)号：US20240117192A1

公开(公告)日：2024-04-11

申请号：US18276914

申请日：2021-12-22

Applicant: SHIN-ETSU CHEMICAL CO., LTD.

Inventor： Kazuyuki MATSUMURA ,  Masanobu NISHIMINE ,  Yusuke ITOH ,  Hisashi YAGI ,  Tsutomu NAKAMURA ,  Yoshiteru SAKATSUME

IPC: C09C1/30 ,  G03G9/113

CPC classification number: C09C1/3081 ,  G03G9/1138

Abstract: A method for manufacturing a surface-treated gas-phase-process silica particle, the method including steps of: adding 1,3-divinyl-1,1,3,3-tetramethyldisilazane to a raw material gas-phase-process silica particle and introducing a vinyldimethylsilyl group on a surface of the raw material gas-phase-process silica particle to obtain a preliminarily treated silica particle; and adding hexamethyldisilazane to the preliminarily treated silica particle and introducing a trimethylsilyl group on a surface of the preliminarily treated silica particle to obtain a surface-treated gas-phase-process silica particle.

公开(公告)号：US20240069458A1

公开(公告)日：2024-02-29

申请号：US18458606

申请日：2023-08-30

Applicant: KYOCERA Document Solutions Inc.

Inventor： Asami SASAKI ,  Norio KUBO ,  Masashi FUJISHIMA ,  Kohei TERASAKI

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

CPC classification number: G03G9/1139 ,  G03G9/0819 ,  G03G9/09725 ,  G03G9/1136 ,  G03G15/0894

Abstract: A developer set includes a first developer and a second developer. The first developer contains a first toner containing first toner particles and a first carrier containing first carrier particles. The second developer contains a second toner containing second toner particles and a second carrier containing second carrier particles. The first toner particles and the second toner particles each include a toner mother particle and external additive particles attached to the surface of the toner mother particle. The external additive particles include spacer particles. The spacer particles have a number average primary particle diameter of at least 32 nm and no greater than 145 nm. The first carrier particles each include a first carrier mother particle and strontium titanate particles attached to the surface of the first carrier mother particle.

公开(公告)号：US20240069457A1

公开(公告)日：2024-02-29

申请号：US18493903

申请日：2023-10-25

Applicant: CANON KABUSHIKI KAISHA

Inventor： RYUJI MURAYAMA ,  SHIN KITAMURA ,  TORU TAKAHASHI ,  DAISUKE TSUJIMOTO ,  RYUICHIRO MATSUO ,  HITOSHI SANO ,  NOBUYUKI FUJITA ,  SHUJI YAMADA ,  YUKA GUNJI ,  TAKAKUNI KOBORI ,  YOSHIHIRO OGAWA ,  ATSUHIKO OHMORI ,  HIROKI KAGAWA ,  KEISUKE ADACHI ,  TOMOKO SUGITA

IPC: G03G9/097 ,  G03G9/08 ,  G03G9/087 ,  G03G9/107 ,  G03G9/113

CPC classification number: G03G9/09725 ,  G03G9/0819 ,  G03G9/0821 ,  G03G9/08755 ,  G03G9/1075 ,  G03G9/1133

Abstract: The toner contains binder resin-containing toner particles and silica fine particle S1, wherein the weight-average particle diameter of the toner is 4.0-15.0 μm, both inclusive, peaks originating with the silica fine particle S1 are observed in 29 Si-NMR measurement of the silica fine particle S1, and, in the spectrum obtained by 29Si CP/MAS NMR or 29Si DD/MAS NMR, the peak area of a peak corresponding to the D1 unit structure in the silica fine particle S1, the peak area of a peak corresponding to the D2 unit structure in the silica fine particle S1, and the peak area of a peak corresponding to the Q unit structure in the silica fine particle S1 satisfy a prescribed relationship.

公开(公告)号：US11773255B2

公开(公告)日：2023-10-03

申请号：US17132120

申请日：2020-12-23

Applicant: Cabot Corporation

Inventor： Dmitry Fomitchev ,  Hairuo Tu ,  Paul S. Palumbo ,  Samir Kumar

IPC: G03G9/087 ,  C08L67/02 ,  B01J13/14 ,  B01J13/20 ,  C08L75/06 ,  C09D5/03 ,  C09D11/30 ,  G03G9/113 ,  G03G9/093

CPC classification number: C08L67/02 ,  B01J13/14 ,  B01J13/203 ,  C08L75/06 ,  C09D5/03 ,  C09D11/30 ,  G03G9/09321 ,  G03G9/1131 ,  G03G9/1133 ,  C08L2205/025 ,  C08L2205/03 ,  C08L2207/53

Abstract: The invention provides a process for preparing core-shell composite particles comprising a polyester, polymerized ethylenically unsaturated silane compounds, and optionally a hydrophobic surface treatment. The invention further provides a composite particle comprising a polyester and a radically polymerized ethylenically unsaturated silane compound.

公开(公告)号：US20230305419A1

公开(公告)日：2023-09-28

申请号：US18182741

申请日：2023-03-13

Applicant: CANON KABUSHIKI KAISHA

Inventor： HIROKI WATANABE ,  ICHIRO KANNO ,  MARI KABURAGI ,  HAYATO IDA

IPC: G03G9/107 ,  G03G9/113 ,  G03G9/093 ,  G03G9/08 ,  G03G9/087

CPC classification number: G03G9/1075 ,  G03G9/1133 ,  G03G9/09328 ,  G03G9/081 ,  G03G9/08791

Abstract: A two component developer comprising a toner and a specific magnetic carrier, wherein a toner particle in the toner comprises a surface layer comprising an organosilicon polymer, electrical conductivity of a filtrate obtained by filtering off the toner using a specific procedure is 1.0 to 2.5 μS/cm, and when dC (atomic %) denotes carbon concentration, dO (atomic %) denotes oxygen concentration and dSi (atomic %) denotes silicon concentration, as measured by ESCA, at the surface of the toner particle, then the dC, the dO and the dSi satisfy the following formulae:


40.0≤dC/(dC+dO+dSi)×100≤60.0



10.0≤dSi/(dC+dO+dSi)×100≤26.0.

公开(公告)号：US20230152726A1

公开(公告)日：2023-05-18

申请号：US17915345

申请日：2021-03-17

Applicant: POWDERTECH CO.,LTD.

Inventor： Makoto ISHIKAWA ,  Tetsuya UEMURA

IPC: G03G9/107 ,  C04B35/26 ,  G03G9/08 ,  G03G9/113

CPC classification number: G03G9/1085 ,  C04B35/2625 ,  G03G9/0821 ,  G03G9/1132 ,  C04B2235/763 ,  C04B2235/768 ,  C04B2235/963 ,  C04B2235/3248 ,  C04B2235/3274

Abstract: The present invention relates to a ferrite particle containing a crystal phase component containing a perovskite crystal represented by a compositional formula: RZrO3 (provided that R represents an alkaline earth metal element), having a surface roughness Rz of 0.8 µm or more and 3.5 µm or less, and having a standard deviation Rzσ of the surface roughness Rz falling in a range represented by the following formula 0.15 × Rz ≤ Rzσ ≤ 0.60 × Rz. The ferrite particle can be used as an electrophotographic developer carrier core material. In addition, an electrophotographic developer carrier and an electrophotographic developer can be obtained.

公开(公告)号：US11640121B2

公开(公告)日：2023-05-02

申请号：US17175766

申请日：2021-02-15

Applicant: KYOCERA Document Solutions Inc.

Inventor： Yuma Uchihashi

IPC: G03G9/113 ,  G03G9/097

Abstract: A carrier for a developer includes carrier particles. The carrier particles have a sea island structure including a sea portion and an island portion on the surface. The island portion contains a nitrogen-containing silicone resin. The sea portion contains a nitrogen-free silicone resin. The area ratio of the island portion in the total area of the surface of the carrier particle is 20% or more and 40% or less.