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公开(公告)号：US11448982B2
公开(公告)日：2022-09-20
申请号：US17071540
申请日：2020-10-15
Applicant: CANON KABUSHIKI KAISHA
Inventor： Tsuneyoshi Tominaga , Shohei Tsuda , Shohei Kototani , Noriyoshi Umeda , Masahiro Kurachi , Kazuhiro Yamauchi , Motonari Ito
Abstract: An electrophotographic apparatus including an electrophotographic photosensitive member, a charging unit, and a developing unit, wherein the charging unit includes a conductive member disposed to be contactable with the electrophotographic photosensitive member, a conductive layer of the conductive member has a matrix-domain structure, at least some of the domains are exposed at the outer surface of the conductive member, the volume resistivity RI of the matrix is greater than 1.00×1012 Ω·cm and not greater than 1.00×1017 Ω·cm, the matrix volume resistivity R1 is at least 1.0×105-times the domain volume resistivity R2, and the developing unit includes a toner, the toner includes a binder resin-containing toner particle and an external additive, and the external additive contains fine particles of a hydrotalcite compound.
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公开(公告)号：US20210003932A1
公开(公告)日：2021-01-07
申请号：US16911929
申请日：2020-06-25
Applicant: CANON KABUSHIKI KAISHA
Inventor： Shohei Tsuda , Tsuneyoshi Tominaga , Masatake Tanaka , Taiji Katsura , Masamichi Sato
IPC: G03G9/08
Abstract: A toner including a toner particle including a binder resin, wherein fine particles A and B are present on a surface of the toner particle; the fine particles A are a fatty acid metal salt; the fine particles B have a specific volume resistivity; an average theoretical surface area of the toner particle, an amount of the fine particles A, and a coverage ratio of the toner particle surface by the fine particles A satisfy a specific relationship; the amount of the fine particles B is in a specific range; and a proportion F of an area occupied by a part of the fine particles B embedded in a surface vicinity region of the toner in a total area occupied by the fine particles B present in a cross section of one particle of the toner is 50% by area or more.
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公开(公告)号：US20190041762A1
公开(公告)日：2019-02-07
申请号：US16047413
申请日：2018-07-27
Applicant: CANON KABUSHIKI KAISHA
Inventor： Daisuke Yoshiba , Shohei Tsuda , Mariko Yamashita , Kozue Uratani , Ryo Nagata
Abstract: A toner comprising: a toner particle that contains a binder resin and a colorant: and an external additive, wherein (1) the average circularity of the toner is at least 0.960; (2) the fixing ratio of the external additive on the toner particle is from 75% to 100%; and (3) in a differential curve obtained by the differentiation, by load, of a load-displacement curve where the horizontal axis is load (mN) and the vertical axis is displacement (μm), the load-displacement curve being provided by measurement of the strength of the toner by a nanoindentation procedure, a load A that provides a maximum value in the differential curve in a load region from 0.20 mN to 2.30 mN is from 1.15 mN to 1.50 mN.
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公开(公告)号：US10197934B2
公开(公告)日：2019-02-05
申请号：US15631186
申请日：2017-06-23
Applicant: CANON KABUSHIKI KAISHA
Inventor： Takashi Matsui , Naoki Okamoto , Yuujirou Nagashima , Keisuke Tanaka , Shohei Tsuda , Kosuke Fukudome , Takuya Mizuguchi
Abstract: A toner having a toner particle containing a binder resin, an amorphous polyester, and a colorant, wherein a softening point of the toner is at least 110° C. and not more than 140° C.; an integrated value f1 for stress of the toner is not more than 10 g·m/sec, as measured using a tack tester, with a temperature for a probe end being 150° C. and a press holding time being 0.01 seconds; and an integrated value f2 for stress of the toner is at least 30 g·m/sec, as measured using a tack tester, with a temperature for a probe end being 150° C. and a press holding time being 0.1 seconds.
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公开(公告)号：US20180004106A1
公开(公告)日：2018-01-04
申请号：US15631366
申请日：2017-06-23
Applicant: CANON KABUSHIKI KAISHA
Inventor： Takashi Matsui , Yuujirou Nagashima , Keisuke Tanaka , Shohei Tsuda , Naoki Okamoto
CPC classification number: G03G9/0825 , G03G9/0804 , G03G9/081 , G03G9/0833 , G03G9/08708 , G03G9/08711 , G03G9/08724 , G03G9/08755 , G03G9/08795 , G03G9/08797 , G03G9/0904 , G03G15/0216
Abstract: A toner comprising a toner particle containing a binder resin, a colorant, an amorphous polyester, and a crystalline polyester, wherein the binder resin contains a vinyl resin; the amorphous polyester has a monomer unit derived from a linear aliphatic dicarboxylic acid having 6 to 12 carbons, and a monomer unit derived from a dialcohol; the content of the monomer unit derived from a linear aliphatic dicarboxylic acid having 6 to 12 carbons is 10 to 50 mol % with reference to the total monomer units derived from a carboxylic acid in the amorphous polyester; and in a cross section of the toner particle, the vinyl resin constitutes a matrix and the amorphous polyester constitutes domains, and the crystalline polyester is present in the interior of the domains.
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Patent Agency Ranking
公开(公告)号：US09778583B2
公开(公告)日：2017-10-03
申请号：US14817201
申请日：2015-08-03
Applicant: CANON KABUSHIKI KAISHA
Inventor： Kazuo Terauchi , Yojiro Hotta , Takeshi Naka , Motohide Shiozawa , Shohei Tsuda , Masami Fujimoto
CPC classification number: G03G9/0827 , G03G9/0819 , G03G9/09 , G03G9/09716 , G03G13/08
Abstract: A toner having compatibility between transfer properties and cleaning properties is provided. A toner wherein a fine particle A containing a primary particle having a number average particle diameter (D1) of 80 nm or more and 400 nm or less is present on the surface of a toner particle at a coverage ratio of 5 to 40%, a fixing rate of 30 to 90% by mass, and a variation coefficient of 0.1 to 0.5 in a region of 0.5 πμm2.
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公开(公告)号：US20160041481A1
公开(公告)日：2016-02-11
申请号：US14814873
申请日：2015-07-31
Applicant: CANON KABUSHIKI KAISHA
Inventor： Shotaro Nomura , Koji Nishikawa , Kosuke Fukudome , Daisuke Yoshiba , Shohei Tsuda , Hiroki Akiyama , Katsuhisa Yamazaki
IPC: G03G9/08
CPC classification number: G03G9/0825 , G03G9/0808 , G03G9/0827 , G03G9/09708 , G03G9/09716 , G03G9/09733
Abstract: To provide a toner from which an image having a stable image density can be obtained with reduced occurrence of pollution of members, even when a toner container is filled with a larger amount of toner than a conventional amount for long-term use. A toner including a toner particle and an external additive containing an organic-inorganic composite fine particle and an inorganic fine particle A; wherein the organic-inorganic composite fine particle includes a resin particle and an inorganic fine particle B, the resin particle has a surface with a convex derived from the inorganic fine particle B; has a specific number average particle diameter (D1) and a specific shape factor SF-2; and has a specific fixed state to the toner particle; the organic-inorganic composite fine particle has a specific unit diffusion index on the toner particle surface; the inorganic fine particle A has a specific BET specific surface area.
Abstract translation: 为了提供一种调色剂，即使当调色剂容器被填充比常规用量长的使用量大的调色剂容器时，也可以从其中获得具有稳定图像浓度的图像，同时减少了部件污染的发生。 包含调色剂颗粒和包含有机 - 无机复合细颗粒和无机细颗粒A的外部添加剂的调色剂; 其中有机 - 无机复合微粒包括树脂颗粒和无机细颗粒B，树脂颗粒具有来自无机细颗粒B的具有凸面的表面; 具有特定数均粒径（D1）和特定形状因子SF-2; 并且对调色剂颗粒具有特定的固定状态; 有机 - 无机复合微粒在调色剂颗粒表面上具有特定的单位扩散指数; 无机细颗粒A具有特定的BET比表面积。
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公开(公告)号：US20150037720A1
公开(公告)日：2015-02-05
申请号：US14446112
申请日：2014-07-29
Applicant: CANON KABUSHIKI KAISHA
Inventor： Shohei Tsuda , Yojiro Hotta , Kouji Nishikawa , Shotaro Nomura , Katsuhisa Yamazaki , Masami Fujimoto , Takayuki Itakura
IPC: G03G9/083
CPC classification number: G03G9/081 , G03G9/0819 , G03G9/0827 , G03G9/083 , G03G9/09725
Abstract: Provided is magnetic toner capable of favorably maintain fluidity of the magnetic toner in a developing unit even after a large number of image formation. The magnetic toner to which an external additive that has 1) a number average particle diameter of 70 or more and 200 or less, 2) a shape factor SF-1 of 100 or more and 250 or less, and 3) a shape factor SF-2 of 105 or more and 250 or less, is added, and a covering rate by silica on the surfaces of toner particles is 40.0% or more and 70.0% or less, and the magnetic toner has specific fluidity.
Abstract translation: 提供了即使在大量图像形成之后也能够有利地保持显影单元中的磁性调色剂的流动性的磁性调色剂。 具有1）数均粒径为70以上且200以下的外部添加剂的磁性调色剂，2）形状因子SF-1为100以上且250以下，3）形状因子SF -2为105以上且250以下，并且调色剂颗粒表面上的二氧化硅的覆盖率为40.0％以上且70.0％以下，并且磁性调色剂具有特定的流动性。
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公开(公告)号：US20230047510A1
公开(公告)日：2023-02-16
申请号：US17814094
申请日：2022-07-21
Applicant: CANON KABUSHIKI KAISHA
Inventor： Shohei Tsuda , Taiji Katsura , Shintaro Kawaguchi
Abstract: A toner comprising: a toner particle comprising a binder resin and boric acid; and an external additive A having a primary particle major diameter of 80 to 200 nm, wherein in ATR-IR analysis of the toner particle in an ATR method using germanium as an ATR crystal, a peak corresponding to boric acid is detected, the average value of a shape factor SF-1 of the external additive A is 105 to 250, and the average value of a shape factor SF-2 of the external additive A is 102 to 250.
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公开(公告)号：US11061342B2
公开(公告)日：2021-07-13
申请号：US17071103
申请日：2020-10-15
Applicant: CANON KABUSHIKI KAISHA
Inventor： Noriyoshi Umeda , Tsuneyoshi Tominaga , Shohei Tsuda , Shohei Kototani , Masahiro Kurachi , Kazuhiro Yamauchi , Hideo Kihara
Abstract: An electrophotographic apparatus comprising an electrophotographic photosensitive member, a charging device, and a developing device, wherein the charging device comprises a conductive member arranged to be capable of contacting the electrophotographic photosensitive member, a conductive layer on the conductive member outer surface comprises a matrix and a plurality of domains dispersed in the matrix, at least some of the domains are exposed at the conductive member outer surface, the matrix has a volume resistivity of larger than 1.00×1012 Ω·cm and is 1.0×105 times or more one of the domains, the developing device comprises the toner comprising a toner particle, fine particles A and B, the fine particle A has a volume resistivity of 1.0×103 to 1.0×1010 Ω·cm, and the fine particle B is silica fine particle and having a volume resistivity of 1.0×1011 to 1.0×1017 Ω·cm.
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