公开(公告)号：US12228885B2

公开(公告)日：2025-02-18

申请号：US17500917

申请日：2021-10-13

Applicant: FUJIFILM Business Innovation Corp.

Inventor： Takako Kobayashi ,  Yoshifumi Iida ,  Takashi Hasegawa

IPC: G03G9/087 ,  G03G9/08 ,  G03G9/097 ,  G03G15/00 ,  G03G15/08

Abstract: Pressure-responsive particles include pressure-responsive base particles and resin particles, in which the pressure-responsive base particles contain a styrene-based resin that contains styrene and other vinyl monomers as polymerization components and a (meth)acrylic acid ester-based resin that contains at least two kinds of (meth)acrylic acid esters as polymerization components, a ratio of a mass of the (meth)acrylic acid esters to a total mass of polymerization components is 90% by mass or more in the (meth)acrylic acid ester-based resin, the pressure-responsive particles have at least two glass transition temperatures, a difference between a lowest glass transition temperature and a highest glass transition temperature is 30° C. or higher, and a ratio of a mass of the resin particles to a total mass of the pressure-responsive particles is 0.05% by mass or more and 2.0% by mass or less.

公开(公告)号：US20240417537A1

公开(公告)日：2024-12-19

申请号：US18750344

申请日：2024-06-21

Applicant: Cabot Corporation

Inventor： Hairuo Tu ,  Jincheng Xiong ,  Paul S. Palumbo ,  Dmitry Fomitchev

IPC: C08K3/36 ,  C08K9/06 ,  C09C1/30 ,  G03G9/08 ,  G03G9/097

Abstract: Metal oxide-polymer composite particles have a median particle size D50 of 40-75 nm or 100-150 nm and an average RTA of at least 0.06. Alternatively or in addition, metal oxide-polymer composites comprise two or more populations of metal oxide particles differing in size, particle size distribution, or shape. Alternatively or in addition, the use of a multicomponent hydrophobizing system including an alkylsilane to fabricate metal oxide-polymer composite particles increases the tribocharge of the composite particles.

公开(公告)号：US20240369950A1

公开(公告)日：2024-11-07

申请号：US18645908

申请日：2024-04-25

Applicant: CANON KABUSHIKI KAISHA

Inventor： KENTA KAMIKURA ,  SHOHEI TSUDA ,  TORU ISHII

IPC: G03G9/097 ,  G03G9/087

Abstract: A toner comprising a toner particle comprising a binder resin, and an external additive, wherein the external additive comprises a fatty acid metal salt particle; the toner comprises fumaric acid; with a (mol/g) as a content of the fumaric acid in the toner, and with b (mol/g) as a content of the fatty acid metal salt particle in the toner, Formula (1) below is satisfied: 0 . 5 ⁢ 0 ≤ a / b ≤ 7 ⁢ 0 ⁢ .00 . ( 1 )

公开(公告)号：US12135507B2

公开(公告)日：2024-11-05

申请号：US17481640

申请日：2021-09-22

Applicant: CANON KABUSHIKI KAISHA

Inventor： Noriaki Egawa ,  Tomoaki Nakai

IPC: G03G15/02 ,  G03G9/087 ,  G03G9/097

Abstract: Provided is an electrophotographic member that includes a surface with excellent abrasion resistance and allows toner to have an increased charge amount, thereby eliciting uniform and high transfer efficiency. This electrophotographic member is provided with a surface layer including at least one of an acrylic resin and methacrylic resin, the surface layer further including a positively chargeable charge control agent, wherein a surface of the surface layer is free from a convex portion having a height of more than 15 μm resulting from the charge control agent.

公开(公告)号：US12105469B2

公开(公告)日：2024-10-01

申请号：US17400172

申请日：2021-08-12

Applicant: FUJIFILM Business Innovation Corp.

Inventor： Atsushi Sugawara ,  Hiroshi Nakazawa

IPC: G03G9/087 ,  G03G9/08 ,  G03G9/097 ,  G03G15/08 ,  G03G21/18

CPC classification number: G03G9/0819 ,  G03G9/0804 ,  G03G9/08755 ,  G03G9/09733 ,  G03G15/08 ,  G03G21/1814

Abstract: An electrostatic charge image developing toner includes a toner particle containing a binder resin and a releasing agent, and the following requirement (1) is satisfied in cross section observation of the toner particle: requirement (1): the number of a releasing agent domain having a long diameter of 500 nm or more and 1,000 nm or less is 7 or more on average per toner particle.

公开(公告)号：US20240309214A1

公开(公告)日：2024-09-19

申请号：US18277804

申请日：2021-12-22

Applicant: SHIN-ETSU CHEMICAL CO., LTD.

Inventor： Kazuyuki MATSUMURA

IPC: C09C1/30 ,  G03G9/097

CPC classification number: C09C1/3081 ,  G03G9/09725 ,  C01P2004/32 ,  C01P2004/64 ,  C01P2006/10 ,  C01P2006/90

Abstract: A method for manufacturing a surface-treated sol-gel silica particle that can impart good flowability when added into a toner and has little change in charge during environment change; a manufacturing method therefor; and an external additive for a toner containing the surface-treated sol-gel silica particle. The method includes steps of: (A1) obtaining a hydrophilic sol-gel silica particle having a silanol group on a surface and substantially composed of a SiO2 unit; (A2) adding a compound having a (C2H5)3Si— group or a R1R22Si— group, and introducing a (C2H5)3SiO1/2 unit or a R1R22SiO1/2 unit on a surface of the hydrophilic sol-gel silica particle to obtain a preliminarily treated silica particle; and (A3) adding a compound having a R33Si— group, and further introducing a R33SiO1/2 unit on a surface of the preliminarily treated silica particle to obtain a surface-treated sol-gel silica particle.

公开(公告)号：US20240302762A1

公开(公告)日：2024-09-12

申请号：US18598569

申请日：2024-03-07

Applicant: KYOCERA Document Solutions Inc.

Inventor： Sho SUMIOKA

IPC: G03G9/113 ,  G03G9/08 ,  G03G9/093 ,  G03G9/097

CPC classification number: G03G9/1136 ,  G03G9/0819 ,  G03G9/09342 ,  G03G9/09741

Abstract: A two-component developer contains a carrier containing carrier particles and a toner containing toner particles. The carrier particles each include a carrier core and a coat layer covering the surface of the carrier core. The coat layers contain a silicone resin. The toner particles each include a toner mother particle and an external additive attached to the surface of the toner mother particle. The external additive contains specific resin particles. The specific resin particles contain a crosslinked resin. The specific resin particles have a number average primary particle diameter of at least 37 nm and no greater than 103 nm. The specific resin particles have a content of at least 0.6 parts by mass and no greater than 1.0 part by mass relative to 100 parts by mass of the toner mother particles.

公开(公告)号：US20240302761A1

公开(公告)日：2024-09-12

申请号：US18591259

申请日：2024-02-29

Applicant: Sharp Kabushiki Kaisha

Inventor： TADANORI KANO

IPC: G03G9/097 ,  G03G9/08

CPC classification number: G03G9/09716 ,  G03G9/0819 ,  G03G2215/0607

Abstract: A two-component developer contains a carrier and a toner in which an external additive is attached to a toner particle surface. The external additive contains a fine powder that has an average primary particle diameter of 10 nm to 25 nm and contains aluminum. The two-component developer has an apparent density of 1.7 g/cm3 to 2.0 g/cm3 at a toner concentration in of 4% by mass. A resistance value when a voltage of 1,000 V or 600 V is applied to a magnetic brush having a length of 0.1 cm formed by placing the two-component developer having a toner concentration of 4% by mass at a filling rate of 20% between two electrodes disposed parallel to each other at an interval of 0.1 cm in a magnetic field of 200 mT is 1 GΩ or more or 22 GΩ or less, respectively, per square centimeter of the electrodes.

公开(公告)号：US12044972B2

公开(公告)日：2024-07-23

申请号：US17032255

申请日：2020-09-25

Applicant: FUJIFILM Corporation

Inventor： Hiroshi Tashiro

IPC: G03F7/32 ,  G03F7/20 ,  G03F7/40 ,  G03G9/097 ,  G03G9/125

CPC classification number: G03F7/322 ,  G03F7/2014 ,  G03F7/40 ,  G03G9/0975 ,  G03G9/09775 ,  G03G9/125

Abstract: An aqueous developer for a flexographic printing plate capable of maintaining good printing reproducibility and suppressing the adhesion and aggregation of the dispersion in the developer during repeated use, and a method of manufacturing a flexographic printing plate using the same, are provided. The aqueous developer for a flexographic printing plate is an aqueous developer for a flexographic printing plate containing a surfactant having a molecular weight of 1000 or more, and water.

公开(公告)号：US20240241461A1

公开(公告)日：2024-07-18

申请号：US18575982

申请日：2022-03-31

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tamotsu SHIMIZU ,  Kohei TERASAKI ,  Yuma UCHIHASHI ,  Eriko TAKEUCHI

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

CPC classification number: G03G9/1136 ,  G03G9/0819 ,  G03G9/09733 ,  G03G9/1139

Abstract: In a two-component developer, external additive particles of toner particles include resin particles containing a thermoplastic resin. 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 100-500 nm. The barium titanate particles have a content of 4-45 parts by mass relative to 100 parts by mass of the coating resin. The rate of the mass of the coat layers to the mass of the carrier cores is 0.10-4.90% by mass. The average of coverage rates of the carrier cores is at least 80.0% and less than 100.0%.