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公开(公告)号：US10593454B2
公开(公告)日：2020-03-17
申请号：US15511727
申请日：2015-09-02
Applicant: POWDERTECH CO., LTD.
Inventor： Koji Aga , Tetsuya Igarashi
IPC: H01F1/34 , B82Y40/00 , G03G9/107 , B82Y25/00 , C09C1/22 , C09D7/61 , C09D7/40 , C09D7/62 , C01G49/00 , C09D157/06 , C08K3/013 , C08K3/10 , C08K9/02 , C08K9/06
Abstract: 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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公开(公告)号：US11952286B2
公开(公告)日：2024-04-09
申请号：US16967197
申请日：2019-02-06
Applicant: POWDERTECH CO., LTD.
Inventor： Koji Aga , Takashi Kojima , Kazutaka Ishii , Tetsuya Igarashi , Sho Kuwahara
CPC classification number: C01G49/0072 , C08L29/04 , H01F1/344 , H01F1/37 , H05K9/0081 , C01P2004/32 , C01P2004/51 , C01P2004/61 , C01P2006/11 , C01P2006/12 , C08K3/22 , C08K2201/005 , C08K2201/006 , C08K2201/01
Abstract: Provided are: an Mn ferrite powder characterized by including a plurality of ferrite particles, having a volume-average particle diameter of 1-10 μm, and having a 2.106 μm volume-based cumulative distribution (sieved) of 0.1-50.0 vol %; and a resin composition characterized by including said powder and a resin material.
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公开(公告)号：US11072537B2
公开(公告)日：2021-07-27
申请号：US16095710
申请日：2017-04-11
Applicant: Powdertech Co., Ltd.
Inventor： Koji Aga , Tetsuya Igarashi
IPC: C01G49/00 , H01F1/20 , C01G49/02 , A47J36/02 , C08K3/22 , C08L101/00 , H01F1/37 , H05B6/74 , C08K7/16
Abstract: Ferrite powder of the present invention is ferrite powder detectable with a metal detector, comprising: soft ferrite particles containing Mn of 3.5 mass % or more and 20.0 mass % or less and Fe of 50.0 mass % or more and 70.0 mass % 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 magnetization by a VSM measurement when magnetic field of 5 K·1000/4πA/m is applied is 85 A·m2/kg or more and 98 A·m2/kg or less.
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Patent Agency Ranking
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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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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7.发明授权公开(公告)号：US11651881B2
公开(公告)日：2023-05-16
申请号：US16650647
申请日：2018-09-27
Applicant: POWDERTECH CO., LTD.
Inventor： Takashi Kojima , Kazutaka Ishii , Takao Sugiura , Tetsuya Igarashi , Koji Aga
CPC classification number: H01F1/344 , C01G49/009 , C01G49/0072 , C30B29/22 , H01F1/33 , H01F1/37 , C01P2004/04 , C01P2004/32 , C01P2004/61 , C01P2004/62 , C01P2004/64 , C01P2006/42 , H01F27/255 , Y10T428/32
Abstract: Mn—Zn ferrite particles according to the present invention contain 44-60% by mass of Fe, 10-16% by mass of Mn and 1-11% by mass of Zn. The ferrite particles are single crystal bodies having an average particle diameter of 1-2,000 nm, and have polyhedral particle shapes, while having an average sphericity of 0.85 or more but less than 0.95.
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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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