公开(公告)号：US11914326B2

公开(公告)日：2024-02-27

申请号：US17327359

申请日：2021-05-21

Applicant: KYOCERA Document Solutions Inc.

Inventor： Masami Tsujihiro

IPC: G03G9/087 ,  C08G63/16 ,  C08G63/195 ,  G03G9/083

CPC classification number: G03G9/08755 ,  C08G63/16 ,  C08G63/195 ,  G03G9/083 ,  G03G9/0874

Abstract: A magnetic toner includes toner particles. The toner particles each include a toner mother particle. The toner mother particle includes a polyester resin domain, a vinyl resin domain, and a magnetic powder. A vinyl resin constituting the vinyl resin domain includes a repeating unit having a non-ring-opened oxazoline group. An area rate of an area in which the vinyl resin domain is exposed in a surface area of the toner mother particle is at least 0.02% and no greater than 1.00%.

公开(公告)号：US11796930B2

公开(公告)日：2023-10-24

申请号：US17168523

申请日：2021-02-05

Applicant: CANON KABUSHIKI KAISHA

Inventor： Shuntaro Watanabe ,  Hiroki Akiyama ,  Hiroki Kagawa

IPC: G03G9/083 ,  G03G9/087

CPC classification number: G03G9/0837 ,  G03G9/0832 ,  G03G9/0836 ,  G03G9/08755

Abstract: A magnetic toner comprising a magnetic toner particle including a binder resin, a magnetic body and a crystalline polyester, wherein in cross-sectional observation of the magnetic toner particle using a transmission electron microscope, a variation coefficient CV3 of an occupied area ratio of the magnetic body when a cross section of the magnetic toner particle is divided by a square grid having a side of 0.8 μm is from 40.0% to 80.0%, and assuming that a storage elastic modulus at 40° C. is taken as E′(40) [Pa] and a storage elastic modulus at 85° C. is taken as E′(85) [Pa], the storage elastic moduli being obtained in a powder dynamic viscoelasticity measurement of the magnetic toner, the following formulas (1) and (2) are satisfied.

E′(85)≤2.0×109  (1)

[E′(40)−E′(85)]×100/E′(40)≥70  (2)

公开(公告)号：US20220350269A1

公开(公告)日：2022-11-03

申请号：US17726159

申请日：2022-04-21

Applicant: Konica Minolta, Inc.

Inventor： Yuya KUBO ,  Takanari KAYAMORI ,  Naoya TONEGAWA ,  Noboru UEDA

IPC: G03G9/083 ,  G03G9/087

Abstract: Disclosed is an electrostatic charge image developing toner including: toner base particles containing at least a binder resin and a magnetic material; and an external additive, wherein the binder resin contains a crystalline resin; and the external additive contains strontium titanate particles doped with metal elements other than titanium and strontium.

公开(公告)号：US20220171302A1

公开(公告)日：2022-06-02

申请号：US17524353

申请日：2021-11-11

Applicant: CANON KABUSHIKI KAISHA

Inventor： Kazuyuki Sato ,  Tomohisa Sano ,  Daisuke Yoshiba ,  Tohru Hiramatsu

IPC: G03G9/08 ,  G03G9/087 ,  G03G9/097 ,  G03G9/083

Abstract: The toner is a toner including a toner particle comprising a binder resin, a crystalline material, wherein, when a ratio of an area occupied by the crystalline material in a toner surface observed with a scanning electron microscope after ruthenium-staining the toner under a specific condition (1) is represented by S1 (%), a ratio of an area occupied by the crystalline material in the toner surface observed with the scanning electron microscope after ruthenium-staining the toner under a condition (2) is represented by S2 (%), and a dispersion diameter of a plurality of domains formed of the crystalline material on the toner surface observed with the scanning electron microscope after the ruthenium-staining the toner under the condition (2) is represented by R2 (nm), the following expressions (1), (2), and (3) are satisfied. 0 . 0 ≤ S 1 ≤ 0.5 ( 1 ) 1.0 ≤ S 2 ≤ 10.0 ( 2 ) 20 ≤ R 2 ≤ 200 ( 3 )

公开(公告)号：US20210278773A1

公开(公告)日：2021-09-09

申请号：US16944975

申请日：2020-07-31

Applicant: FUJI XEROX CO., LTD

Inventor： Jumpei IWASAKI ,  Yasuo Kadokura ,  Shintaro Anno ,  Kazutsuna Sasaki ,  Satoshi Miura

IPC: G03G9/083 ,  G03G9/097 ,  G03G9/08 ,  G03G9/087 ,  G03G15/08

Abstract: An electrostatic charge image developing carrier includes: magnetic particles; and a resin layer coating the magnetic particles and containing inorganic particles, in which an average particle diameter of the inorganic particles is 5 nm or more and 90 nm or less, an average thickness of the resin layer is 0.6 μm or more and 1.4 μm or less, and a ratio B/A of a surface area B of the electrostatic charge image developing carrier to a plan view area A of the electrostatic charge image developing carrier is 1.020 or more and 1.100 or less when a surface of the electrostatic charge image developing carrier is three-dimensionally analyzed.

公开(公告)号：US10996576B2

公开(公告)日：2021-05-04

申请号：US16474497

申请日：2017-12-25

Applicant: POWDERTECH CO., LTD.

Inventor： Hiroki Sawamoto ,  Tetsuya Uemura

IPC: G03G9/113 ,  G03G9/107 ,  G03G9/10 ,  G03G9/083

Abstract: Provided are a magnetic core material for electrophotographic developer and a carrier for electrophotographic developer, which are excellent in charge characteristics and strength and with which a satisfactory image free from defects can be obtained, and a developer containing the carrier.
A magnetic core material for electrophotographic developer, having a sulfur component content of from 50 to 700 ppm in terms of a sulfate ion and a BET specific surface area of from 0.06 to 0.25 m2/g.

公开(公告)号：US20210116830A1

公开(公告)日：2021-04-22

申请号：US17060289

申请日：2020-10-01

Applicant: Akio TAKEI ,  Takahiro HONDA ,  Tsukiko TAKAHASHI ,  Tsuneyasu NAGATOMO

Inventor： Akio TAKEI ,  Takahiro HONDA ,  Tsukiko TAKAHASHI ,  Tsuneyasu NAGATOMO

IPC: G03G9/087 ,  G03G9/08 ,  G03G9/083

Abstract: A toner is provided. The toner comprises colored particles and external additives present on surfaces of the colored particles. The colored particles each comprise a core and a shell layer. The core contains a crystalline resin, a non-crystalline resin, and a colorant. The shell layer contains a resin and has a thickness of from 30 to 130 nm. The external additives comprise a metal oxide and a silicon compound. An electronegativity X(A) of the metal oxide and an electronegativity X(Si) of the silicon compound satisfy a relation 0.5≤X(A)/X(Si)≤0.8. A proportion of an amount of the metal oxide directly adhered to the surfaces of the colored particles to a total amount of the metal oxide present on the colored particles is from 60% to 90% by mass.

公开(公告)号：US20210088924A1

公开(公告)日：2021-03-25

申请号：US16841670

申请日：2020-04-06

Applicant: FUJI XEROX CO., LTD.

Inventor： Shintaro ANNO ,  Takuro WATANABE ,  Yasuaki HASHIMOTO ,  Yasuo KADOKURA ,  Kazutsuna SASAKI ,  Jumpei IWASAKI

IPC: G03G9/107 ,  G03G9/113 ,  G03G9/08 ,  G03G9/083 ,  G03G9/087 ,  G03G21/18

Abstract: A carrier for electrostatic image development includes: a core material; and a coating resin layer that contains inorganic particles and covers the core material. The content of the inorganic particles is 10% by mass or more and 60% by mass or less based on the total mass of the coating resin layer. The volume average diameter D (μm) of the inorganic particles and the thickness T (μm) of the coating resin layer satisfy the following relational expression (1): 0.007≤D/T≤0.24.

公开(公告)号：US20200103776A1

公开(公告)日：2020-04-02

申请号：US16584346

申请日：2019-09-26

Applicant: CANON KABUSHIKI KAISHA

Inventor： Tetsuya Kinumatsu ,  Kosuke Fukudome ,  Yusuke Hasegawa

IPC: G03G9/087 ,  G03G9/083

Abstract: A magnetic toner comprising a magnetic toner particle including a binder resin, a magnetic body and a crystalline polyester, wherein the dielectric loss tangent at 100 kHz is 1.0×10−2 or more, a variation coefficient CV3 of an occupied area ratio of the magnetic body when a cross section of the magnetic toner particle is divided by a square grid having a side of 0.8 μm in cross-sectional observation of the magnetic toner particle using a transmission electron microscope TEM is from 30.0% to 80.0%, and where a storage elastic modulus of the magnetic toner at 40° C. is taken as E′(40) [Pa] and a storage elastic modulus of the magnetic toner at 85° C. is taken as E′(85) [Pa], the following formulas (1) and (2) are satisfied: E′(85)≤5.5×109   (1) [E′(40)−E′(85)]×100/E′(40)≥30   (2)

公开(公告)号：US20200050123A1

公开(公告)日：2020-02-13

申请号：US16526501

申请日：2019-07-30

Applicant: CANON KABUSHIKI KAISHA

Inventor： Nobuyoshi Sugahara ,  Ryuichiro Matsuo ,  Hironori Minagawa ,  Wakashi Iida

IPC: G03G9/107 ,  G03G9/113 ,  G03G9/09 ,  G03G9/087 ,  G03G9/083

Abstract: A magnetic carrier including a magnetic carrier particle having a magnetic carrier core and a resin coating layer formed on a surface of the magnetic carrier core, wherein the resin coating layer includes a resin component including a resin A and a resin B, the resin A is a copolymer of monomers including (a) a (meth)acrylic acid ester monomer having an alicyclic hydrocarbon group and (b) a specific macromonomer, the resin B is a copolymer of monomers including (c) a styrene-based monomer and (d) a specific (meth)acrylic acid ester monomer, and based on the resin components of the resin coating layer, the amount of the resin A is from 20% by mass to 99% by mass, and the amount of the resin B is from 1% by mass to 80% by mass.