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    FERRITE PARTICLES, RESIN COMPOSITION AND RESIN FILM
    21.
    发明申请
    FERRITE PARTICLES, RESIN COMPOSITION AND RESIN FILM 审中-公开

    公开(公告)号：US20190161362A1

    公开(公告)日：2019-05-30

    申请号：US16082102

    申请日：2017-02-22

    Applicant: POWDERTECH CO., LTD.

    Inventor： Takashi KOJIMA ,  Kazutaka ISHII ,  Takao SUGIURA ,  Tetsuya IGARASHI ,  Koji AGA

    IPC: C01G49/00 ,  C08K3/22 ,  C08K7/18 ,  H01F1/375

    Abstract: An object of the present invention is to provide ferrite particles having a high saturation magnetisation, and being excellent in the dispersibility in a resin, a solvent or a resin composition, a resin composition including the ferrite particles, and a resin film composed of the resin composition. The ferrite particles are a single crystalline body having an average particle size of 1 to 2000 nm, and Mn-based ferrite particles having a spherical shape, and have a saturation magnetisation of 45 to 95 Am2/kg. The resin composition includes the ferrite particles as a filler. The resin film is composed of the resin composition.

    COMPOSITE MAGNETIC POWDER FOR NOISE SUPPRESSION
    22.
    发明申请
    COMPOSITE MAGNETIC POWDER FOR NOISE SUPPRESSION 审中-公开
    用于噪声抑制的复合磁粉

    公开(公告)号：US20160044838A1

    公开(公告)日：2016-02-11

    申请号：US14780715

    申请日：2014-03-18

    Applicant: POWDERTECH CO., LTD.

    Inventor： Koji AGA ,  Tetsuya IGARASHI

    IPC: H05K9/00 ,  H01F1/20 ,  H01F1/147 ,  B22F1/00

    CPC classification number: H05K9/0075 ,  B22F1/0003 ,  B22F1/02 ,  C22C2202/02 ,  H01F1/14766 ,  H01F1/20 ,  H01F1/26

    Abstract: The object is to provide a composite magnetic powder for noise suppression to give a noise suppressor having ability to suppress the noise in a wide range from a low frequency through a high frequency while suppressing heat generation by reducing a dielectric constant loss on the high frequency side, and in order to attain the object, there is employed a composite magnetic powder for noise suppression in which the surface of a metallic powder is coated with a fine particle having a high dielectric constant and a binder resin or the like. By using this composite magnetic powder for noise suppression, there can be provided a noise suppressor excellent in ability to suppress the noise in a wide frequency region.

    Abstract translation: 本发明的目的是提供一种用于噪声抑制的复合磁粉，以提供具有从低频到高频抑制宽范围内的噪声的噪声抑制器，同时通过降低高频侧的介电常数损失来抑制发热 为了达到上述目的，采用了用金属粉末的表面涂布高介电常数的微粒和粘结剂树脂等的噪声抑制用复合磁粉。 通过使用该复合磁粉进行噪声抑制，可以提供在宽频率区域抑制噪声的能力优异的噪声抑制器。

    POROUS FERRITE CORE MATERIAL FOR ELECTROPHOTOGRAPHIC DEVELOPER, RESIN-COATED FERRITE CARRIER AND ELECTROPHOTOGRAPHIC DEVELOPER USING THE FERRITE CARRIER
    23.
    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。

    FERRITE POWDER AND METHOD OF PRODUCING THE SAME
    24.
    发明申请
    FERRITE POWDER AND METHOD OF PRODUCING THE SAME 有权

    公开(公告)号：US20230085745A1

    公开(公告)日：2023-03-23

    申请号：US17795382

    申请日：2021-01-27

    Applicant: POWDERTECH CO., LTD.

    Inventor： Koji AGA ,  Takashi KOJIMA ,  Takao SUGIURA ,  Sho KUWAHARA ,  Satomi KONNO ,  Tadashi TSUDUKI

    IPC: H01F1/34 ,  C01G49/00

    Abstract: Provided are a ferrite powder capable of maintaining a high withstand voltage even when used in a resin composition having high magnetic properties and electrical resistivity and a high filling ratio, and a method for producing the same. A ferrite powder composed of spherical ferrite particles, wherein the ferrite powder contains iron (Fe): 55.0-70.0 mass % and manganese (Mn): 3.5-18.5 mass %, the ferrite powder containing more than 0.0 mass % to 7.5 mass % α-Fe2O3, and the ferrite powder has a volume average particle size (D50) of 15.0 μm or less.

    IRON OXIDE POWDER FOR BRAKE FRICTION MATERIAL
    25.
    发明申请
    IRON OXIDE POWDER FOR BRAKE FRICTION MATERIAL 有权

    公开(公告)号：US20220163082A1

    公开(公告)日：2022-05-26

    申请号：US17666140

    申请日：2022-02-07

    Applicant: POWDERTECH CO., LTD.

    Inventor： Koji AGA ,  Takashi KOJIMA

    IPC: F16D69/02 ,  C01G49/06

    Abstract: Provided is an iron oxide powder for a brake friction material which can be suitably used in a brake friction material that is less likely to cause problems regarding brake squealing and that provides superior braking performance. The iron oxide powder for a brake friction material according to a first embodiment of the present invention is characterized by having a sulfur content of 150 ppm or less as measured by combustion ion chromatography, and a saturation magnetization of 20 emu/g or less. The iron oxide powder for a brake friction material according to a second embodiment of the present invention is characterized by having an average particle size of 1.0 μm or more, a chlorine content of 150 ppm or less as measured by combustion ion chromatography, and a saturation magnetization of 20 emu/g or less.

    FERRITE POWDER, RESIN COMPOSITION, AND MOLDED ARTICLE
    30.
    发明申请
    FERRITE POWDER, RESIN COMPOSITION, AND MOLDED ARTICLE 审中-公开

    公开(公告)号：US20190040226A1

    公开(公告)日：2019-02-07

    申请号：US16083533

    申请日：2017-03-27

    Applicant: Powdertech Co., Ltd.

    Inventor： Koji AGA ,  Tetsuya IGARASHI

    IPC: C08K3/22 ,  C01G49/00 ,  A47J36/02 ,  B65D65/38

    Abstract: Ferrite powder of the present invention is ferrite powder detectable with a metal detector, comprising: hard ferrite particles containing Sr of 7.8 mass % or more and 9.0 mass % or less and Fe of 61.0 mass % or more and 65.0 mass % or less, wherein an amount of Na to be measured by ion chromatography is 1 ppm or more and 200 ppm or less. It is preferable that a volume average particle diameter of the particles constituting the ferrite powder is 0.1 μm or more and 100 μm or less. It is preferable that residual magnetization by a VSM measurement when magnetic field of 10 K·1000/4πA/m is applied is 25 A·m2/kg or more and 40 A·m2/kg or less.

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