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公开(公告)号：US11521768B2
公开(公告)日：2022-12-06
申请号：US16496357
申请日：2018-03-30
Applicant: POWDERTECH CO., LTD.
Inventor： Kazutaka Ishii , Koji Aga , Takao Sugiura , Takashi Kojima
Abstract: The ferrite powder of the present invention is a ferrite powder containing a plurality of ferrite particles, wherein the ferrite particles each are a single crystal body having an average particle diameter of 1-2,000 nm, and have a polyhedron shape, and wherein the ferrite particles each contain 2.0-10.0 mass % of Sr, and 55.0-70.0 mass % of Fe.
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公开(公告)号：US10825593B2
公开(公告)日：2020-11-03
申请号：US16336644
申请日：2017-06-07
Applicant: POWDERTECH CO., LTD.
Inventor： Takashi Kojima , Kazutaka Ishii , Takao Sugiura , Tetsuya Igarashi , Koji Aga
Abstract: An object of the present invention is to provide ferrite particles having high saturation magnetisation and electrical resistivity, excellent in dispersibility in a resin, a solvent, or a resin composition; a rein composition containing the ferrite particles; and a resin molding composed of the resin composition. A Ni-Zn-Cu ferrite particle is in a single crystalline body having an average particle diameter of 1 to 2000 nm, has a polyhedral particle shape, and comprises 5 to 10 wt % of Ni, 15 to 30 wt % of Zn, 1 to 5 wt % of Cu, and 25 to 50 wt % of Fe.
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公开(公告)号：US10258970B2
公开(公告)日：2019-04-16
申请号：US15544665
申请日：2016-01-26
Applicant: POWDERTECH CO., LTD.
Inventor： Koji Aga , Takao Sugiura
IPC: B01J23/00 , B01J23/745 , B01J23/889 , B01J23/89 , B01J32/00 , B01J35/00 , C01G23/047 , C01G49/00 , G03G9/107 , G03G9/113 , B01J35/02 , B01J37/08 , B01J37/16 , B01J37/00 , B01J37/02
Abstract: An object of the present invention is to provide ferrite particles for supporting a catalyst having a small apparent density, various properties are maintained in a controllable state and a specified volume is filled with a small weight, and a catalyst using the ferrite particles for supporting a catalyst. To achieve the object, ferrite particles for supporting a catalyst provided with an outer shell structure containing Ti oxide, a catalyst using the ferrite particles for supporting a catalyst are employed.
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14.发明授权Ferrite particle having outer shell structure, ferrite carrier core material for electrophotographic developer, and electrophotographic developer 有权具有外壳结构的铁氧体颗粒，用于电子照相显影剂的铁氧体载体芯材和电子照相显影剂公开(公告)号：US09372426B2
公开(公告)日：2016-06-21
申请号：US14785676
申请日：2015-01-16
Applicant: POWDERTECH CO., LTD.
Inventor： Koji Aga
CPC classification number: G03G9/1075 , C01G49/0036 , C01P2004/03 , C01P2004/51 , C01P2004/61 , C01P2004/62 , C01P2006/12 , C01P2006/14 , C01P2006/42 , G03G9/0819 , G03G9/107 , G03G9/1131
Abstract: It is an object of the present invention to provide a ferrite particle having a low apparent density, and being capable of maintaining various properties thereof in controllable states and filling a fixed volume in a small weight thereof, a ferrite carrier core material and a ferrite carrier for an electrophotographic developer using the ferrite particle, and the like. In order to achieve the object, there are employed the ferrite particle having a porous structure in the interior thereof and an outer shell structure on the outer periphery thereof, the ferrite carrier core material and the ferrite carrier for an electrophotographic developer using the ferrite particle, and an electrophotographic developer using the ferrite carrier.
Abstract translation: 本发明的目的是提供一种表观密度低的铁氧体颗粒，并且能够将其各种性能保持在可控状态并以小重量填充固定体积，铁氧体载体芯材和铁氧体载体 对于使用铁氧体颗粒的电子照相显影剂等。 为了实现该目的，在其内部使用具有多孔结构的铁氧体颗粒和其外周上的外壳结构，铁氧体载体芯材和使用铁氧体颗粒的电子照相显影剂的铁氧体载体， 和使用该铁氧体载体的电子照相显影剂。
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公开(公告)号：US11542174B2
公开(公告)日：2023-01-03
申请号：US16307794
申请日：2017-05-31
Applicant: POWDERTECH CO., LTD.
Inventor： Takashi Kojima , Kazutaka Ishii , Takao Sugiura , Tetsuya Igarashi , Koji Aga
Abstract: An object of the present invention is to provide ferrite particles having a high magnetic permeability in a frequency band of 1 MHz to 1 GHz. Another object is to provide a resin composition containing the ferrite particles and an electromagnetic wave shielding material composed of the resin composition. The ferrite particles are composed of a single crystalline body having an average particle size of 1 to 2000 nm and has a spherical particle shape, wherein the ferrite particles contain substantially no Zn, 3 to 25 wt % of Mn, and 43 to 65 wt % of Fe, and a real part μ′ of a complex magnetic permeability measured using a molding composed of the ferrite particles and a binder resin has a maximal value in a frequency band of 100 MHz to 1 GHz.
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Patent Agency Ranking
公开(公告)号：US11359689B2
公开(公告)日：2022-06-14
申请号：US16466427
申请日：2017-12-12
Applicant: POWDERTECH CO., LTD.
Inventor： Koji Aga , Takashi Kojima
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.
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公开(公告)号：US11032955B2
公开(公告)日：2021-06-08
申请号：US16094081
申请日：2017-04-05
Applicant: POWDERTECH CO., LTD.
Inventor： Koji Aga , Tetsuya Igarashi
Abstract: The present invention provides a powdered ferrite having high dispersibility in a resin and high electromagnetic shielding characteristics. The powdered ferrite comprises platy ferrite particles having a spinel crystal structure. The powdered ferrite comprises at least 50 number % platy ferrite particles each having at least one protrusion on a surface of the particle, and the protrusion has a shape selected from the group consisting of a rectangular pyramid, a truncated rectangular pyramid, an elongated rectangular pyramid, and combinations thereof.
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公开(公告)号：US11014826B2
公开(公告)日：2021-05-25
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: H01F1/36 , H01F1/37 , H01F1/375 , C01G49/00 , C08K3/22 , C08L101/00 , C30B29/22 , C08K7/18 , H05K1/02 , H05K1/03
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.
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公开(公告)号：US10603614B2
公开(公告)日：2020-03-31
申请号：US15545521
申请日：2016-01-25
Applicant: POWDERTECH CO., LTD.
Inventor： Koji Aga , Takao Sugiura
IPC: B01J20/02 , B01D39/06 , B01J20/06 , C01G49/00 , H01F1/11 , C04B35/628 , B01J20/28 , B01J20/30 , B01J20/32
Abstract: An object of the present invention is to provide ferrite particles for a filtering medium excellent in filtration ability having a small apparent density, capable of various properties maintained in the controllable state and filling a specified volume with a small amount, and a filtering medium made from the ferrite particles. In order to achieve the object, ferrite particles provided an outer shell structure containing Ti oxide for a filtering medium, and a filtering medium made from the ferrite particles are employed.
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公开(公告)号：US10564561B2
公开(公告)日：2020-02-18
申请号：US16084466
申请日：2017-03-29
Applicant: POWDERTECH CO., LTD.
Inventor： Takao Sugiura , Kazutaka Ishii , Koji Aga
Abstract: An object of the present invention is to provide a ferrite carrier core material for an electrophotographic developer having desired resistance properties and charging properties with small environmental variation of resistivity and charge amount while maintaining the advantages of ferrite carriers, a ferrite carrier for an electrophotographic developer, an electrophotographic developer using the ferrite carrier, and a method for manufacturing the ferrite carrier core material for an electrophotographic developer. In order to solve the problem, a ferrite carrier core material comprising ferrite particles containing 15 mass % or more and 25 mass % or less of Mn, 0.5 mass % or more and 5.0 mass % or less of Mg, 0.05 mass % or more and 4.0 mass % of Sr, and 45 mass % or more and 55 mass % or less of Fe, with Zr localized in the surface thereof is used.
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