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公开(公告)号：US20220269189A1
公开(公告)日：2022-08-25
申请号：US17666326
申请日：2022-02-07
Applicant: CANON KABUSHIKI KAISHA
Inventor： Yuu Nishimura , Yuzo Tokunaga , Nobuyoshi Sugahara , Hironori Minagawa , Nobuhiro Yoshida
IPC: G03G9/113
Abstract: A magnetic carrier comprises a magnetic carrier core and a coating resin layer coating a surface of the magnetic carrier core. The coating resin layer contains resin A and resin B at contents of 1% to 50% by mass and 50% to 90% by mass, respectively, based on resin components of the coating resin layer. The resin A has a first partial structure and a second partial structure, while the resin B has a third partial structure and a fourth partial structure. The mass X of the resin A, the total mass Ma of the first partial structure, and the total mass Mb of the second partial structure satisfy 0.50≤(Ma+Mb)/X≤1.00 and 0.10≤a/b≤30.0, and the SP value of the first partial structure SPa1 and the SP value of the third partial structure SPb3 satisfy 0≤|SPa1—SPb3|≤10.0.
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公开(公告)号：US20220236660A1
公开(公告)日：2022-07-28
申请号：US17581433
申请日：2022-01-21
Applicant: CANON KABUSHIKI KAISHA
Inventor： Ryuji Murayama , Hironori Minagawa , Yuto Onozaki , Nobuhiro Yoshida
IPC: G03G9/113 , G03G9/107 , C08F299/08
Abstract: A magnetic carrier including: a magnetic core; and a coating resin that coats a surface of the magnetic core, wherein the resin coating layer has a thickness of 50 nm or more, a coating resin, which forms the resin coating layer, contains a resin S having an organosilicon polymer moiety, and when a surface and a position at a depth of 20 nm from the surface of the magnetic carrier are analyzed by X-ray photoelectron spectroscopy, an amount of silicon element as determined by the analysis has a ratio within a specific range at respective positions.
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Patent Agency Ranking
公开(公告)号：US12222678B2
公开(公告)日：2025-02-11
申请号：US17582691
申请日：2022-01-24
Applicant: CANON KABUSHIKI KAISHA
Inventor： Ryuji Murayama , Yuto Onozaki , Nobuhiro Yoshida , Hironori Minagawa
Abstract: A magnetic carrier includes a magnetic core and a coating resin that covers a surface of the magnetic core. The coating resin includes a resin A and a resin B. A content of the resin A is 1 to 50% by mass, and a content of the resin B is 50 to 99% by mass, with respect to the coating resin. The resin A has a particular unit Y1 and a particular unit Y2, and the resin B contains 0.1% by mass or less of the particular unit Y2. When a mass of the resin A is represented by X, a mass of the unit Y1 is represented by Ma, and a mass of the unit Y2 is represented by Mb, 0.90≤(Ma+Mb)/X≤1.00 and 1.00≤Ma/Mb≤30.0 are satisfied, and also 0≤|SPa−SPb|≤2.0 is satisfied.
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公开(公告)号：US12164265B2
公开(公告)日：2024-12-10
申请号：US17585315
申请日：2022-01-26
Applicant: CANON KABUSHIKI KAISHA
Inventor： Yuto Onozaki , Ryuji Murayama , Nobuhiro Yoshida , Hironori Minagawa
Abstract: A magnetic carrier including a magnetic core and a coating resin configured to coat the surface of the magnetic core. The coating resin contains a graft resin A and a graft resin B. The coating resin (i) contains 1.0 mass % or more and 50.0 mass % or less of the graft resin A, and (ii) contains 50.0 mass % or more and 99.0 mass % or less of the graft resin B. The graft resin A has a unit Y1 represented by formula (1) and a unit Y2 represented by formula (2). The graft resin B (i) is a comb-shaped polymer having, as a branch, at least one moiety selected from, for example, a styrene-based polymer moiety and a (meth)acrylate-based polymer moiety, and (ii) contains the polysiloxane structure moiety at a content of 0.1 mass % or less.
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公开(公告)号：US20220236659A1
公开(公告)日：2022-07-28
申请号：US17581717
申请日：2022-01-21
Applicant: CANON KABUSHIKI KAISHA
Inventor： Nobuhiro Yoshida , Hironori Minagawa , Yuzo Tokunaga , Nobuyoshi Sugahara , Yuu Nishimura
IPC: G03G9/113 , G03G9/107 , C08F220/22 , G03G15/08
Abstract: A magnetic carrier, which is suppressed from causing the loss and wear of a magnetic carrier coating resin even when used for a long time period, and achieves a stable image density and a reduction in toner scattering. In the magnetic carrier, the resin coating layer contains a resin A having a fluorine polymer moiety, the resin coating layer has an average thickness of 50 nm or more, a ratio F(x) (atomic %) of a fluorine atom detected at a position at a depth of x nm from a surface of a magnetic carrier particle by X-ray photoelectron spectroscopy satisfies formula (1) and formula (2), and when x represents an integer of 0 or more and 20 or less, F(x) satisfies formula (3): 5.0≤F(0)≤15 (1) F(20)≤5.0 (2) |F(x+1)−F(x)|≤7.5 (3).
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公开(公告)号：US20220236658A1
公开(公告)日：2022-07-28
申请号：US17582691
申请日：2022-01-24
Applicant: CANON KABUSHIKI KAISHA
Inventor： Ryuji Murayama , Yuto Onozaki , Nobuhiro Yoshida , Hironori Minagawa
Abstract: A magnetic carrier includes a magnetic core and a coating resin that covers a surface of the magnetic core. The coating resin includes a resin A and a resin B. A content of the resin A is 1 to 50% by mass, and a content of the resin B is 50 to 99% by mass, with respect to the coating resin. The resin A has a particular unit Y1 and a particular unit Y2, and the resin B contains 0.1% by mass or less of the particular unit Y2. When a mass of the resin A is represented by X, a mass of the unit Y1 is represented by Ma, and a mass of the unit Y2 is represented by Mb, 0.90≤(Ma+Mb)/X≤1.00 and 1.00≤Ma/Mb≤30.0 are satisfied, and also 0≤|SPa−SPb|≤2.0 is satisfied.
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公开(公告)号：US20220236657A1
公开(公告)日：2022-07-28
申请号：US17585315
申请日：2022-01-26
Applicant: CANON KABUSHIKI KAISHA
Inventor： Yuto Onozaki , Ryuji Murayama , Nobuhiro Yoshida , Hironori Minagawa
Abstract: A magnetic carrier including a magnetic core and a coating resin configured to coat the surface of the magnetic core. The coating resin contains a graft resin A and a graft resin B. The coating resin (i) contains 1.0 mass % or more and 50.0 mass % or less of the graft resin A, and (ii) contains 50.0 mass % or more and 99.0 mass % or less of the graft resin B. The graft resin A has a unit Y1 represented by formula (1) and a unit Y2 represented by formula (2). The graft resin B (i) is a comb-shaped polymer having, as a branch, at least one moiety selected from, for example, a styrene-based polymer moiety and a (meth)acrylate-based polymer moiety, and (ii) contains the polysiloxane structure moiety at a content of 0.1 mass % or less.
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