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公开(公告)号：US20230296999A1
公开(公告)日：2023-09-21
申请号：US18022961
申请日：2021-08-24
Applicant: POWDERTECH CO.,LTD.
Inventor： Makoto ISHIKAWA , Tetsuya UEMURA
IPC: G03G9/107
CPC classification number: G03G9/1085
Abstract: The present invention relates to a ferrite particle containing a crystal phase component containing a perovskite-type crystal represented by a composition formula of RZrO3 (wherein R is an alkaline earth metal element), and a Mg content of 0.45 mass % or less. The present invention also relates to a carrier core material for an electrophotographic developer, containing the ferrite particle; a carrier for an electrophotographic developer, containing the ferrite particle and a resin coating layer provided on a surface of the ferrite particle; and an electrophotographic developer containing the carrier for an electrophotographic developer and a toner.
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公开(公告)号：US20220019151A1
公开(公告)日：2022-01-20
申请号：US17430440
申请日：2020-02-13
Applicant: POWDERTECH CO.,LTD.
Inventor： Aya SAKUTA , Makoto ISHIKAWA , Hiroki SAWAMOTO , Tetsuya UEMURA
Abstract: The present invention relates to a carrier including: a magnetic core material; and a resin coating layer coating a surface of the magnetic core material, in which the resin coating layer contains a binder resin, and fluorine element-containing resin particles dispersed in the binder resin, the resin coating layer has a coefficient of variation of a film thickness of 25% or less, and the resin coating layer has an average value of the number of the fluorine element-containing resin particles being 3 particles/μm2 or more and 350 particles/μm2 or less per unit area in a cross section of the resin coating layer, and has a coefficient of variation thereof being 20% or less.
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公开(公告)号：US20190049870A1
公开(公告)日：2019-02-14
申请号：US16059405
申请日：2018-08-09
Applicant: POWDERTECH CO., LTD.
Inventor： Aya SAKUTA , Makoto ISHIKAWA , Hiroki SAWAMOTO , Tetsuya UEMURA
Abstract: There is provided a carrier including a magnetic core material having a surface coated with a surfactant-containing resin mixture of an elemental fluorine-containing resin and a polyimide resin. The carrier has an elution amount of an eluted material into water in an elution test ranging from 180 ppm to 3,500 ppm.
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公开(公告)号：US20220155702A1
公开(公告)日：2022-05-19
申请号：US17433593
申请日：2020-02-20
Applicant: POWDERTECH CO.,LTD.
Inventor： Makoto ISHIKAWA , Tetsuya UEMURA
Abstract: The present invention relates to a ferrite particle, containing a crystal phase component containing a perovskite crystal represented by the compositional formula:
RZrO3 (provided that R represents an alkaline earth metal element), and having an apparent density in a range represented by the following formula: 1.90≤Y≤2.45 provided that Y in the formula is the apparent density (g/cm3) of the ferrite particle.-
公开(公告)号：US20200057399A1
公开(公告)日：2020-02-20
申请号：US16492894
申请日：2018-03-29
Applicant: POWDERTECH CO., LTD.
Inventor： Makoto ISHIKAWA , Hiroki SAWAMOTO , Tetsuya UEMURA
Abstract: The present invention provides: a ferrite carrier core material for an electrophotographic developer, the material having a mesh passing amount of 3 wt % or less as indicated by the ratio of the weight of particles passing through a 16 μm-mesh to the weight of whole particles constituting a powder, and having a particle strength index of 2 wt % or less as indicated by a difference between the mesh passing amounts before and after crushing; a ferrite carrier which is for an electrophotographic developer and in which the surface of the ferrite carrier core material is coated with a resin; and an electrophotographic developer which includes the ferrite carrier and a toner.
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Patent Agency Ranking
公开(公告)号：US20240264546A1
公开(公告)日：2024-08-08
申请号：US18564577
申请日：2022-05-27
Applicant: POWDERTECH CO., LTD.
Inventor： Yuzuru YAMASAKI , Makoto ISHIKAWA , Tetsuya UEMURA
CPC classification number: G03G9/1085 , C01G49/06 , C01P2002/32 , C01P2002/70 , C01P2006/12
Abstract: The present invention provides a ferrite particle containing: a ferrite particle body having a spinel crystal structure belonging to a space group Fd-3m and having a spinel composition represented by the following formula (1); and a coating layer having a spinel crystal structure belonging to the space group Fd-3m and coating a surface of the ferrite particle body, in which the coating layer is a layer obtained by subjecting the ferrite represented by the following formula (1) to a heat treatment, and a content ratio of the coating layer in the ferrite particle obtained by subjecting a powder X-ray diffraction pattern to Rietveld analysis is 5 mass % or more and 35 mass % or less, and the ferrite particle satisfies a specific formula (2). The present invention also provides a carrier for an electrophotographic developer.
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公开(公告)号：US20230152726A1
公开(公告)日：2023-05-18
申请号：US17915345
申请日：2021-03-17
Applicant: POWDERTECH CO.,LTD.
Inventor： Makoto ISHIKAWA , Tetsuya UEMURA
CPC classification number: G03G9/1085 , C04B35/2625 , G03G9/0821 , G03G9/1132 , C04B2235/763 , C04B2235/768 , C04B2235/963 , C04B2235/3248 , C04B2235/3274
Abstract: The present invention relates to a ferrite particle containing a crystal phase component containing a perovskite crystal represented by a compositional formula: RZrO3 (provided that R represents an alkaline earth metal element), having a surface roughness Rz of 0.8 µm or more and 3.5 µm or less, and having a standard deviation Rzσ of the surface roughness Rz falling in a range represented by the following formula 0.15 × Rz ≤ Rzσ ≤ 0.60 × Rz. The ferrite particle can be used as an electrophotographic developer carrier core material. In addition, an electrophotographic developer carrier and an electrophotographic developer can be obtained.
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公开(公告)号：US20220155701A1
公开(公告)日：2022-05-19
申请号：US17433591
申请日：2020-02-20
Applicant: POWDERTECH CO., LTD.
Inventor： Makoto ISHIKAWA , Tetsuya UEMURA
Abstract: The present invention provides: a ferrite particle containing a crystal phase component containing a perovskite crystal represented by the compositional formula RZrO3 (where R is an alkaline earth metal element); and an electrophotographic developer carrier core material, an electrophotographic developer carrier, and an electrophotographic developer containing the ferrite particles.
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9.发明申请POROUS FERRITE CORE MATERIAL FOR ELECTROPHOTOGRAPHIC DEVELOPER, RESIN-COATED FERRITE CARRIER AND ELECTROPHOTOGRAPHIC DEVELOPER USING THE FERRITE CARRIER 有权用于电子显影开发商的多孔铁素体材料，使用铁素体载体的树脂涂覆的铁素体载体和电子显影开发商公开(公告)号：US20130183614A1
公开(公告)日：2013-07-18
申请号：US13738324
申请日：2013-01-10
Applicant: Powdertech Co., Ltd.
Inventor： Koji AGA , Makoto ISHIKAWA , Masashi AOKI
IPC: G03G9/107
CPC classification number: G03G9/1075 , G03G9/107
Abstract: A porous ferrite core material for an electrophotographic developer wherein the apparent density thereof is 1.5 to 1.9 g/cm3, the shape factor SF-2 thereof is 101 to 110 and the magnetization as measured with a VSM at 1K·1000/4π·A/m is 40 to 60 Am2/kg, a resin-coated ferrite carrier for an electrophotographic developer obtained by coating the surface of the porous ferrite core material with a resin, and an electrophotographic developer using the ferrite carrier.
Abstract translation: 一种用于电子照相显影剂的多孔铁氧体芯材料，其表观密度为1.5至1.9g / cm 3，其形状因子SF-2为101至110，并且以1K·1000 / 4pi·A / m为40〜60Am 2 / kg，通过用树脂涂布多孔铁素体芯材的表面而得到的电子照相显影剂用树脂被覆铁氧体载体和使用该铁氧体载体的电子照相显影剂。
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10.发明公开公开(公告)号：US20240254004A1
公开(公告)日：2024-08-01
申请号：US18564394
申请日：2022-05-27
Applicant: POWDERTECH CO., LTD.
Inventor： Yuzuru YAMASAKI , Makoto ISHIKAWA , Tetsuya UEMURA
CPC classification number: C01G49/009 , G03G9/108 , G03G9/1132 , C01P2006/10 , C01P2006/42
Abstract: A ferrite particle having a spinel crystal structure belonging to a space group Fd-3m and having a ferrite composition represented by a specific formula, a carrier for an electrophotographic developer including the ferrite particle and a resin coating layer configured to coat a surface of the ferrite particle, an electrophotographic developer including the carrier for an electrophotographic developer and a toner, and a ferrite particle production method for producing the ferrite particle.
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