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公开(公告)号：US12235606B2
公开(公告)日：2025-02-25
申请号：US17480797
申请日：2021-09-21
Applicant: CANON KABUSHIKI KAISHA
Inventor： Masatake Tanaka , Tomoya Uesugi , Shintaro Kawaguchi , Masamichi Sato
Abstract: A process cartridge includes a photosensitive member, a toner, and a developing roller, a surface layer of the photosensitive member has a Martens hardness of 245 to 300 N/mm2, the developing roller has a single-layered surface layer containing a substrate and a binder resin; when an elastic modulus of the binder resin in a first region is E1, and an elastic modulus of the binder resin in a second region is E2, E1≥200 MPa and 10 MPa≤E2≤150 MPa are satisfied; the elastic modulus in the second region continuously decreases from that in the first region; the toner comprises a toner particle and an external additive A; the external additive A is a silica particle having a major diameter of 40 to 400 nm; and a coverage of the external additive A with respect to surface of the toner particle is 5.0% or more.
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公开(公告)号：US12228882B2
公开(公告)日：2025-02-18
申请号：US17660146
申请日：2022-04-21
Applicant: CANON KABUSHIKI KAISHA
Inventor： Atsuhiko Ohmori , Hiroki Kagawa , Keisuke Adachi , Tomoko Sugita
Abstract: A toner comprising: a toner particle comprising a binder resin and a hydrocarbon wax; and inorganic fine particles, wherein the inorganic fine particles include silica fine particles surface-treated with specific polydimethylsiloxanes, a total amount of trimethylsilanol in the silica fine particles is from 1.0 ppm to 5.0 ppm, where a standard value of an amount of ions of an ester group is measured by time-of-flight secondary ion mass spectrometry, one or more peaks of the standard value are present within a range of 100 nm from the surface of the toner particle, and the maximum value A(d max) among the peaks of the standard value and the standard value A(0) on the surface of the toner particle satisfy the following relationships: 1.05≤A(d max)/A(0)≤5.00, A(0)≥0.010.
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公开(公告)号：US20250044717A1
公开(公告)日：2025-02-06
申请号：US18782590
申请日：2024-07-24
Applicant: SHARP KABUSHIKI KAISHA
Inventor： SHOJI NAKAI
Abstract: In an image forming apparatus, a two-component developer including an initial toner and a carrier is previously charged into a developer tank, and a replenishment toner is replenished into the developer tank as the development proceeds. The image forming apparatus has the following configuration. The initial toner contains, as external additives, a fine powder prepared by adding silica to strontium titanate to form a core and hydrophobizing a surface of the core with a silane compound, and a silica particle, and does not contain any titanium dioxide particle or contains a titanium dioxide particle at 50% by mass or less of the fine powder. The replenishment toner contains, as external additives, a titanium dioxide particle and a silica particle, and does not contain the fine powder or contains the fine powder at 50% by mass or less of the titanium dioxide particle.
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公开(公告)号：US12215201B2
公开(公告)日：2025-02-04
申请号：US17462467
申请日：2021-08-31
Applicant: FUJIFILM Business Innovation Corp.
Inventor： Takashi Inukai , Keita Yamamoto
Abstract: A method for producing a resin particle dispersion includes: preparing a phase-inverted emulsion by phase inversion emulsification of a resin using an organic solvent and an aqueous medium; and removing the organic solvent from the phase-inverted emulsion contained in a distillation tank by reduced pressure distillation. During the reduced pressure distillation, the rate of pressure reduction in an environment in which the pressure inside the distillation tank is equal to or higher than vapor pressure and equal to or lower than (the vapor pressure+5 kPa) when the concentration of the organic solvent in the phase-inverted emulsion is in the range of 30% by mass or less to 1% by mass or more is from 0.01 kPa/min to 0.5 kPa/min inclusive until the pressure inside the distillation tank reaches a preset reduced pressure for the reduced pressure distillation.
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公开(公告)号：US20250028271A1
公开(公告)日：2025-01-23
申请号：US18909811
申请日：2024-10-08
Applicant: CANON KABUSHIKI KAISHA
Inventor： ATSUSHI TODA , TORU OGUMA , KAZUHISA SHIDA
Abstract: An image forming apparatus may comprise a holding container that holds a toner containing an antibacterial agent, and an image forming unit that forms an antibacterial region by applying the toner supplied from the holding container to a recording material by performing an image forming process. The antibacterial region is formed on a partial region that is a partial region of a first surface of the recording material and that is likely to be touched by a user's finger
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Patent Agency Ranking
公开(公告)号：US12204276B2
公开(公告)日：2025-01-21
申请号：US17406271
申请日：2021-08-19
Applicant: FUJIFILM Business Innovation Corp.
Inventor： Takahisa Tatekawa , Daisuke Tomita , Daisuke Noguchi , Kazuhiko Nakamura , Yuji Isshiki
IPC: G03G9/08
Abstract: A preparing method of an electrostatic charge image developing toner includes: aggregating binder resin particles in a dispersion containing the binder resin particles to form aggregated particles; and coalescing the aggregated particles by heating a dispersion containing the aggregated particles to form toner particles. The aggregating includes stirring the dispersion in the aggregating at a required stirring power of 1.0 kW/m3 or more and 6.0 kW/m3 or less per unit volume, and the preparing method satisfies the following Requirement (1), in which Requirement (1): a viscosity of the dispersion during the stirring is 5 Pa·s or more and 50 Pa·s or less at a shear rate of 1/s, where the viscosity of the dispersion is measured at a sample temperature of 25° C. using a part of the dispersion as a sample.
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公开(公告)号：US12202953B2
公开(公告)日：2025-01-21
申请号：US17820621
申请日：2022-08-18
Applicant: Xerox Corporation
Inventor： Chunliang Lu , Peter V Nguyen , Yu Qi
IPC: C08K5/00 , C08K5/1545 , C08K5/16 , C09D11/328 , G03G9/08 , G03G9/09 , G03G9/093
Abstract: Fluorescent magenta latexes are provided which may comprise water and fluorescent agent-incorporated resin particles, the particles comprising a resin, Solvent Red 49 as a red fluorescent agent, and Solvent Yellow 98 as a yellow fluorescent agent, wherein the fluorescent magenta latex has a weight ratio of the Solvent Red 49 to the Solvent Yellow 98 in a range of from 3:1 to 10:1. Fluorescent magenta toners and methods of making and using the fluorescent magenta toners are also provided.
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公开(公告)号：US20250013160A1
公开(公告)日：2025-01-09
申请号：US18733829
申请日：2024-06-04
Applicant: FUJIFILM Business Innovation Corp.
Inventor： Takahisa TATEKAWA , Takahiro YAMASHITA , Masaru TAKAHASHI , Yukiaki NAKAMURA
Abstract: A manufacturing method of an electrostatic charge image developing toner includes aggregating and coalescing material particles containing colorant-containing polyester resin particles in a dispersion medium to obtain toner particles, the manufacturing method including a production step of the colorant-containing polyester resin particles, in which the production step of the colorant-containing polyester resin particles includes mixing a basic colorant and a polyester resin while applying heat to obtain a mixture, and emulsifying the mixture, and in the production step of the colorant-containing polyester resin particles, a time-weighted average T° C. of a temperature of the polyester resin and a time R seconds during which the temperature of the polyester resin is in a range of 35° C. or higher and 100° C. or lower satisfy a relationship of 200≤(T×ln R)≤550.
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公开(公告)号：US12189334B2
公开(公告)日：2025-01-07
申请号：US17500891
申请日：2021-10-13
Applicant: FUJIFILM Business Innovation Corp.
Inventor： Satoshi Miura , Yoshimasa Fujihara , Atsushi Sugawara , Shintaro Anno , Daisuke Noguchi
Abstract: An electrostatic charge image developing toner includes a toner particle that contains a binder resin having an acid value of 5 mgKOH/g or more and 25 mgKOH/g or less, and a pigment having an isoindoline skeleton, in which a total Net intensity NA of an alkali metal and an alkaline earth metal, which is measured by fluorescent X-ray analysis, in the toner particle is 1.50 kcps or more and 4.00 kcps or less.
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公开(公告)号：US20250004391A1
公开(公告)日：2025-01-02
申请号：US18733817
申请日：2024-06-04
Applicant: FUJIFILM Business Innovation Corp.
Inventor： Keita YAMAMOTO , Takahiro YAMASHITA , Yuji ISSHIKI
Abstract: A manufacturing method of an electrostatic charge image developing toner includes a first aggregation step of aggregating polyester resin particles in a dispersion containing the polyester resin particles to form first aggregated particles, a second aggregation step of mixing the dispersion containing the first aggregated particles with a dispersion containing amorphous polyester resin particles, and while agitating the mixed dispersions, adhering the amorphous polyester resin particles on a surface of the first aggregated particles to form second aggregated particles, and a coalescence step of heating the dispersion containing the second aggregated particles for coalescing the second aggregated particles to form toner particles, in which the second aggregation step satisfies the following expression (1), expression (2), and expression (3), 35 ≤ Tc ≤ ( Tgs - 5 ) , expression ( 1 ) 10 ≤ Ts ≤ Tc , expression ( 2 ) 0.6 ≤ ( P - P 0 ) ≤ 3. , expression ( 3 ) where Tgs is a glass transition temperature (° C.) of an amorphous polyester resin contained in the amorphous polyester resin particles, Tc is a temperature (° C.) of the dispersion containing the first aggregated particles at a start of the mixing, Ts is a temperature (° C.) of the dispersion containing the amorphous polyester resin particles at the start of the mixing, P is an agitation power (kW/m3) per unit volume, and P0 is an idle agitation power (kW/m3) per unit volume.
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