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公开(公告)号：EP4435519A1
公开(公告)日：2024-09-25
申请号：EP23191971.3
申请日：2023-08-17
发明人： TSURUMI, Yosuke , KADOKURA, Yasuo , IGUCHI, Moegi
CPC分类号： G03G9/08797 , G03G9/08755 , G03G9/08795 , G03G9/08711 , G03G9/107 , G03G9/1132 , G03G9/1131 , G03G9/08793 , G03G9/0821
摘要： An electrostatic charge image developer contains a toner including toner particles that contain a binder resin and a carrier including magnetic particles and a resin layer that adheres to a surface of the magnetic particles, in which, in a dynamic viscoelasticity measurement of the toner, in a case where a loss tangent tanδ at a temperature of 90°C and a strain of 1% is represented by D1 (90), a loss tangent tanδ at a temperature of 90°C and a strain of 50% is represented by D50 (90), a loss tangent tanδ at a temperature of 150°C and a strain of 1% is represented by D1 (150), and a loss tangent tanδ at a temperature of 150°C and a strain of 50% is represented by D50 (150), each of D1 (90), D50 (90), D1 (150), and D50 (150) is 0.5 or more and 2.5 or less, a value of D50 (150) - D1 (150) is less than 1.5, and a value of D50 (90) - D1 (90) is less than 1.0, and in the surface of the magnetic particles, an average unevenness interval Sm and an arithmetic mean roughness Ra satisfy 0.5 µm ≤ Sm ≤ 2.5 µm and 0.3 µm ≤ Ra ≤ 1.2 µm.
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公开(公告)号：EP4063963B1
公开(公告)日：2024-08-21
申请号：EP21195634.7
申请日：2021-09-08
CPC分类号： G03G9/1131 , G03G9/1133 , G03G9/1134 , G03G9/1139 , G03G9/108
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3.发明公开
公开(公告)号：EP4343440A1
公开(公告)日：2024-03-27
申请号：EP23168251.9
申请日：2023-04-17
摘要： An electrostatic image developer includes: a toner A to which silica particles (A) containing an elemental nitrogen-containing compound containing elemental molybdenum are externally added; and a carrier B including a core material and a coating resin layer that covers the core material and contains inorganic particles. In the silica particles (A), the ratio N Mo /N Si of a Net intensity N Mo of elemental molybdenum that is measured by X-ray fluorescence analysis to a Net intensity N Si of elemental silicon that is measured by the X-ray fluorescence analysis is from 0.035 to 0.45 inclusive.
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公开(公告)号：EP3582023B1
公开(公告)日：2023-09-06
申请号：EP19179610.1
申请日：2019-06-12
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公开(公告)号：EP4130885A1
公开(公告)日：2023-02-08
申请号：EP21779984.0
申请日：2021-03-17
申请人： Powdertech Co., Ltd.
发明人： ISHIKAWA, Makoto , UEMURA, Tetsuya
摘要： Provided are: ferrite particles in which the environmental stability of charging characteristics is high and the charge rise is good; an electrophotographic developer carrier core material; an electrophotographic developer carrier; and an electrophotographic developer. The ferrite particles are characterized by containing a crystal-phase component comprising perovskite crystals represented by the composition formula of RZrO 3 (wherein R is an alkaline earth metal element), and by having a surface roughness Rz of 0.8 µm to 3.5 µm, inclusive, and further characterized in that the standard deviation Rzσ of the surface roughness is within a range represented by a prescribed formula. The ferrite particles are used as an electrophotographic developer carrier core material. Using the same, an electrophotographic developer carrier and an electrophotographic developer are obtained.
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公开(公告)号：EP4036657A2
公开(公告)日：2022-08-03
申请号：EP22150877.3
申请日：2022-01-11
摘要： A magnetic carrier includes: a magnetic core; and a coating resin that covers a surface of the magnetic core, wherein 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; and when a mass of the resin A is represented by X, a mass of the unit Y1 is represented by a, and a mass of the unit Y2 is represented by b, 0.90 ≤ (a+b)/X ≤ 1.00 and 1.00 ≤ a/b ≤ 30.0 are satisfied, and also 0 ≤ |SPa-SPb| ≤ 2.0 is satisfied.
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公开(公告)号：EP3932870A1
公开(公告)日：2022-01-05
申请号：EP20762586.4
申请日：2020-02-20
申请人： Powdertech Co., Ltd.
发明人： ISHIKAWA Makoto , UEMURA Tetsuya
摘要： The present invention provides: ferrite particles comprising a crystal phase component comprising perovskite crystals represented by the compositional formula RZrO 3 (where R is an alkaline earth metal element); and an electrophotographic developer carrier core material, an electrophotographic developer carrier, and an electrophotographic developer containing said ferrite particles.
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公开(公告)号：EP3196168A4
公开(公告)日：2018-07-18
申请号：EP15842995
申请日：2015-09-02
申请人： POWDERTECH CO LTD
发明人： AGA KOJI , IGARASHI TETSUYA
CPC分类号： H01F1/344 , B82Y25/00 , B82Y40/00 , C01G49/0072 , C01P2004/03 , C01P2004/32 , C01P2004/61 , C01P2004/62 , C01P2004/64 , C01P2004/84 , C01P2006/12 , C01P2006/40 , C01P2006/42 , C08K3/013 , C08K3/10 , C08K9/02 , C08K9/06 , C08K2201/005 , C08K2201/01 , C09C1/22 , C09D7/61 , C09D7/62 , C09D7/70 , C09D157/06 , G03G9/107
摘要： An object is to provide the ferrite particles used as a magnetic filler or a raw material for a molded product excellent in dispersibility as a powder and excellent in uniformity after molding and result the surface with small unevenness; and a method of manufacturing the particles. To achieve the object, Mn-Mg ferrite particles having an average particle size of 1 to 2000 nm and having a spherical shape are employed. It is preferable that the ferrite particles are produced by a method including subjecting of a ferrite raw material obtained through preparation of a ferrite composition to flame-spraying in air for ferritization followed by rapid cooling for solidifying of the ferrite.
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9.发明授权CARRIER FOR DEVELOPING ELECTROSTATIC LATENT IMAGE, TWO-COMPONENT DEVELOPER AND IMAGE FORMING METHOD 有权用于开发静电潜像的载体，双组分显影剂和图像形成方法
公开(公告)号：EP2642344B1
公开(公告)日：2018-05-02
申请号：EP13159578.7
申请日：2013-03-15
申请人： Ricoh Company, Ltd.
发明人： Yaguchi, Shigenori , Tohmatsu, Hiroshi , Sakata, Koichi , Iwatsuki, Hitoshi , Kishida, Hiroyuki , Tano, Toyoaki
CPC分类号： G03G7/008 , G03G9/1075 , G03G9/1133 , G03G9/1136 , G03G9/1139
摘要： A carrier for developing electrostatic latent image, including a particulate magnetic core material; and a coated layer covering the surface of the particulate magnetic core material, wherein the coated layer includes a resin including a silicone resin and a methacrylic ester or an acrylic ester resin, and a filler including a substrate; and an electroconductive layer comprising tin dioxide (SnO 2 ), overlying the substrate, and wherein the carrier includes tin (Sn) in an amount not less than 0.5% by atom and has a ratio (Sn/Si) of tin (Sn) to silicon (Si) of from 0.03 to 0.2 when subjected to an XPS analysis.
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公开(公告)号：EP2989504B1
公开(公告)日：2018-04-11
申请号：EP14788293.0
申请日：2014-04-25
申请人： Ricoh Company, Ltd.
发明人： KUMAI, Mio , SUGIURA, Hideki , MIZOGUCHI, Yuka
CPC分类号： G03G9/093 , G03G9/0821 , G03G9/08755 , G03G9/08764 , G03G9/08795 , G03G9/08797 , G03G9/107
摘要： Provided is [i] a toner including at least a colorant, a resin, and a releasing agent, wherein a spin-spin relaxation time (t2) of the toner at 90° C. obtained by Hahn Echo method of pulse NMR analysis is from 1.80 msec to 7.00 msec. Also provided is [ii] a toner according to [i], wherein the spin-spin relaxation time (t2) of the toner at 90° C. obtained by Hahn Echo method of pulse NMR analysis is from 3.80 msec to 5.90 msec.
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