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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：US12134567B2
公开(公告)日：2024-11-05
申请号：US17794394
申请日：2021-01-22
Applicant: POWDERTECH CO., LTD.
Inventor： Takashi Kojima , Koji Aga
Abstract: Provided are a ferrite powder that suppresses decreases in saturation magnetization and decreases in filler filling ratio and also suppresses inhibition of resin curing, and a method for producing the same. A ferrite powder composed of spherical ferrite particles, wherein the ferrite powder contains iron (Fe) 54.0-70.0 mass % and manganese (Mn) 3.5-18.5 mass %, has an average volume particle size of 2.0-20.0 μm, and has a carbon content of 0.100 mass % or lower.
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公开(公告)号：US12119151B2
公开(公告)日：2024-10-15
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
CPC classification number: H01F1/344 , C01G49/0072 , C01P2002/50 , C01P2004/32 , C01P2004/61 , C01P2006/40 , C01P2006/42 , C01P2006/80
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.
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公开(公告)号：US10919779B2
公开(公告)日：2021-02-16
申请号：US16466799
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 the present invention is characterized by having an average particle size of 40 μm or more and a saturation magnetization of 20 emu/g or less. The iron oxide powder preferably has a pore volume of 10-180 mm3/g. The iron oxide powder also preferably has a BET specific surface area of 0.05-1.20 m2/g.
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5.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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Patent Agency Ranking
公开(公告)号：US11572926B2
公开(公告)日：2023-02-07
申请号：US17666140
申请日：2022-02-07
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：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：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：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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