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公开(公告)号：US12204277B2
公开(公告)日：2025-01-21
申请号：US17678125
申请日：2022-02-23
Applicant: Yasuo Kamada , Hiroshi Yamada , Toma Takebayashi , Akio Takei
Inventor： Yasuo Kamada , Hiroshi Yamada , Toma Takebayashi , Akio Takei
Abstract: Provided is a toner including toner base particles and resin particles. Each toner base particle includes a binder resin, a colorant, and wax. Each resin particle e has a core-shell structure including a core and a shell, where a glass transition temperature TgA of the shell is higher than a glass transition temperature TgB of the core. A surface of each toner base particle is covered with the resin particles. A storage elastic modulus G′1 of the toner at 70° C. during heating is 1.0×105 Pa or greater but 1.0×103 Pa or less, and a storage elastic modulus G′2 of the toner at 100° C. during heating is 1.0×104 Pa or greater but 5.0×104 Pa or less, as the toner is measured by a rheometer.
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公开(公告)号：US20220291602A1
公开(公告)日：2022-09-15
申请号：US17678125
申请日：2022-02-23
Applicant: Yasuo KAMADA , Hiroshi Yamada , Toma Takebayashi , Akio Takei
Inventor： Yasuo KAMADA , Hiroshi Yamada , Toma Takebayashi , Akio Takei
Abstract: Provided is a toner including toner base particles and resin particles. Each toner base particle includes a binder resin, a colorant, and wax. Each resin particle e has a core-shell structure including a core and a shell, where a glass transition temperature TgA of the shell is higher than a glass transition temperature TgB of the core. A surface of each toner base particle is covered with the resin particles. A storage elastic modulus G′1 of the toner at 70° C. during heating is 1.0×105 Pa or greater but 1.0×103 Pa or less, and a storage elastic modulus G′2 of the toner at 100° C. during heating is 1.0×104 Pa or greater but 5.0×104 Pa or less, as the toner is measured by a rheometer.
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公开(公告)号：US20220137525A1
公开(公告)日：2022-05-05
申请号：US17517359
申请日：2021-11-02
Applicant: Ryuuta Yoshida , Toma Takebayashi , Akio Takei , Yasuo Kamada
Inventor： Ryuuta Yoshida , Toma Takebayashi , Akio Takei , Yasuo Kamada
Abstract: The present disclosure provides a toner having excellent low-temperature fixing, heat-resistant-storage property, cleaning performance, and filming resistance. A toner containing toner base particles having a crystalline polyester resin and an amorphous polyester resin includes a plurality of organic particles disposed at least partially embedded in a surface of the toner base particles. A percentage of the crystalline polyester resin occupying the surface of the toner base particles is 4% to 20%, a volume average particle size of the organic particles is 10 nm to 40 nm, and a standard deviation of a distance between adjacent particles of the organic particles that are not in contact is 500 nm or less.
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公开(公告)号：US20230014605A1
公开(公告)日：2023-01-19
申请号：US17811054
申请日：2022-07-06
Applicant: Akinori SAITOH , Akio Takei , Toma Takebayashi , Masahiro Yukikawa , Tomomi Harashima , Hiroshi Yamada
Inventor： Akinori SAITOH , Akio Takei , Toma Takebayashi , Masahiro Yukikawa , Tomomi Harashima , Hiroshi Yamada
Abstract: A toner includes toner base particles and external additives deposited on a surface of the toner base particle. The toner base particle includes an amorphous polyester resin, a crystalline polyester resin, a release agent, and resin particles. An abundance ratio of the crystalline polyester resin in the surface of the toner base particle as observed by TEM is 2.5% or greater but 25% or less. The resin particles are deposited at the surface of the toner base particle as observed by SEM. A ratio of aggregates of the resin particles occupying the surface of the toner base particle is 1% or greater but 70% or less, where R is a major axis of the minimum particle of the resin particles, and the resin particle having a major axis of 3R or greater is determined as the aggregate.
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5.发明公开公开(公告)号：US20240192620A1
公开(公告)日：2024-06-13
申请号：US18518001
申请日：2023-11-22
Applicant: Yuka Mizoguchi , Akio Takei , Junichi Watanabe , Akinori Saitoh , Masahiro Yukikawa
Inventor： Yuka Mizoguchi , Akio Takei , Junichi Watanabe , Akinori Saitoh , Masahiro Yukikawa
CPC classification number: G03G9/09371 , G03G9/0819
Abstract: A resin particle contains an amorphous resin, a crystalline resin C containing a biomass-derived resin, and at least one of polyethylene terephthalate or polybutylene terephthalate, wherein the resin particle has a core-shell structure comprising a core resin and a shell resin, the core resin comprises the crystalline resin C, and the proportion of the total mass of the biomass-derived resin, the polyethylene terephthalate, and the polybutylene terephthalate to the resin particle at 100 percent by mass is 30 or more percent by mass.
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Patent Agency Ranking
6.发明申请公开(公告)号：US20250013163A1
公开(公告)日：2025-01-09
申请号：US18762222
申请日：2024-07-02
Applicant: Suzuka Karato , Yuka Mizoguchi , Akio Takei , Junichi Watanabe , Shinya Nakayama
Inventor： Suzuka Karato , Yuka Mizoguchi , Akio Takei , Junichi Watanabe , Shinya Nakayama
Abstract: A resin particle contains a resin B containing a component derived from at least one of polyethylene terephthalate or polybutylene terephthalate and a biomass-derived resin C containing a linear aliphatic alcohol with 2 to 4 carbon atoms and a linear aliphatic acid with 10 to 12 carbon atoms, wherein the resin particle has a core shell structure of a core resin and a shell resin, the core resin contains a crystalline resin, and the proportion of the sum of the resin B and the resin C to 100 percent by mass of the resin particle is 30 or greater percent by mass.
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7.发明公开公开(公告)号：US20230305412A1
公开(公告)日：2023-09-28
申请号：US18181953
申请日：2023-03-10
Applicant: Masahiro YUKIKAWA , Akio Takei , Akinori Saito , Hideto Suzuki
Inventor： Masahiro YUKIKAWA , Akio Takei , Akinori Saito , Hideto Suzuki
IPC: G03G9/08
CPC classification number: G03G9/0827 , G03G9/0806 , G03G9/0821 , G03G9/08755
Abstract: A toner includes toner matrix particles containing resin and wax; and an external additive, wherein an average number of voids per toner is 5 or more and 10 or less per toner with a void diameter Φ (nm) of voids in the toner matrix particles being 500 ≥ Φ ≥ 200, as measured based on cross-sectional observation by a scanning electron microscope (SEM).
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公开(公告)号：US20190243291A1
公开(公告)日：2019-08-08
申请号：US16266149
申请日：2019-02-04
Applicant: Ryohei MATSUDA , Takamasa Hase , Daisuke Inoue , Teppei Kawata , Akio Takei
Inventor： Ryohei MATSUDA , Takamasa Hase , Daisuke Inoue , Teppei Kawata , Akio Takei
Abstract: A fixing method is provided including the step of fixing a toner on a recording medium with a fixing device. The toner comprises a binder resin, a colorant, and a release agent, and has a release agent amount indicator of from 0.01 to 0.20. The release agent amount indicator is represented by a ratio (P2850/P828) of an intensity (P2850) at a wave number of 2,850 cm−1 to an intensity (P828) at a wave number of 828 cm−1 of the toner measured by a Fourier transform infrared spectroscopy attenuated total reflection method. The fixing device includes a fixing rotator driven to rotate by a driving source, a pressure rotator driven to rotate by rotation of the fixing rotator, a fixing belt interposed between the fixing rotator and the pressure rotator, and a heater to heat the fixing belt.
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公开(公告)号：US10571834B2
公开(公告)日：2020-02-25
申请号：US16266149
申请日：2019-02-04
Applicant: Ryohei Matsuda , Takamasa Hase , Daisuke Inoue , Teppei Kawata , Akio Takei
Inventor： Ryohei Matsuda , Takamasa Hase , Daisuke Inoue , Teppei Kawata , Akio Takei
Abstract: A fixing method is provided including the step of fixing a toner on a recording medium with a fixing device. The toner has a binder resin, a colorant, and a release agent, and has a release agent amount indicator of from 0.01 to 0.20. The release agent amount indicator is represented by a ratio (P2850/P828) of an intensity (P2850) at a wave number of 2,850 cm−1 to an intensity (P828) at a wave number of 828 cm−1 of the toner measured by a Fourier transform infrared spectroscopy attenuated total reflection method. The fixing device includes a fixing rotator driven to rotate by a driving source, a pressure rotator driven to rotate by rotation of the fixing rotator, a fixing belt interposed between the fixing rotator and the pressure rotator, and a heater to heat the fixing belt.
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公开(公告)号：US09989869B2
公开(公告)日：2018-06-05
申请号：US15541053
申请日：2016-01-05
Applicant: Daisuke Inoue , Naohiro Watanabe , Ryota Inoue , Masana Shiba , Junichi Awamura , Shingo Sakashita , Tomoki Murayama , Yoshitsugu Kimura , Rintaro Takahashi , Akio Takei
Inventor： Daisuke Inoue , Naohiro Watanabe , Ryota Inoue , Masana Shiba , Junichi Awamura , Shingo Sakashita , Tomoki Murayama , Yoshitsugu Kimura , Rintaro Takahashi , Akio Takei
CPC classification number: G03G9/0821 , G03G9/08755 , G03G9/08782 , G03G9/08793 , G03G9/08795 , G03G9/08797 , G03G9/09392
Abstract: A toner comprising a binder resin and a release agent, wherein the toner has a difference of 30 or less between a maximum value and a minimum value among peak intensities in a range of Molecular weight M±300 where Molecular weight M is a molecular weight selected from a range of from 300 through 5,000 in a molecular weight distribution of tetrahydrofuran (THF)-soluble components in the toner as measured by gel permeation chromatography (GPC), and wherein the peak intensities are defined as relative values assuming a maximum peak value in molecular weights of 20,000 or less is 100, in a molecular weight distribution curve taking an intensity as a vertical axis and a molecular weight as a horizontal axis as measured by GPC.
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