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公开(公告)号：US10585369B2
公开(公告)日：2020-03-10
申请号：US15544729
申请日：2016-01-25
Applicant: POWDERTECH CO., LTD.
Inventor： Koji Aga , Takao Sugiura
Abstract: An object of the present invention is to provide a ferrite particle having a low apparent density, filling a specified volume with a low weight with various properties maintained in a controllable state, a ferrite carrier core material composed of the ferrite particle, and a ferrite carrier using the ferrite core material and an electrophotographic developer. To achieve the object, the ferrite particle having the outer shell structure containing the Ti oxide for the ferrite carrier core material, and the ferrite carrier using the ferrite particle as the ferrite carrier core material and the electrophotographic developer are employed.
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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：US10775711B2
公开(公告)日：2020-09-15
申请号：US16084420
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 Si localized in the surface thereof is used.
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4.发明授权Resin-filled ferrite carrier for electrophotographic developer and electrophotographic developer using the ferrite carrier 有权用于电子照相显影剂的树脂填充铁氧体载体和使用铁素体载体的电子照相显影剂公开(公告)号：US09588453B2
公开(公告)日：2017-03-07
申请号：US14673557
申请日：2015-03-30
Applicant: POWDERTECH CO., LTD.
Inventor： Hiroki Sawamoto , Takao Sugiura
CPC classification number: G03G9/10 , G03G9/1075 , G03G9/113 , G03G9/1131 , G03G9/1136 , G03G9/1138
Abstract: There is provided a resin-filled ferrite carrier for an electrophotographic developer, in which a void of a porous ferrite particle used as a ferrite carrier core material is filled with silicone resin, wherein a true specific gravity (Y) of the porous ferrite particle filled with the silicone resin and a Si/Fe value (X) measured by fluorescent X-ray elemental analysis satisfy the following inequality (1): −350X≦Y−4.83≦−100X (1).
Abstract translation: 提供一种用于电子照相显影剂的树脂填充铁氧体载体，其中用作铁氧体载体芯材料的多孔铁氧体颗粒的空隙填充有硅树脂，其中填充的多孔铁氧体颗粒的真比重（Y） 与硅树脂和通过荧光X射线元素分析测得的Si / Fe值（X）满足以下不等式（1）： - 350 ¢X‰¤Y - 4.83‰¤ - 100 ¢X
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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：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：US11150569B2
公开(公告)日：2021-10-19
申请号：US16200338
申请日：2018-11-26
Applicant: POWDERTECH CO., LTD.
Inventor： Yuzuru Yamasaki , Takao Sugiura , Takeshi Naito , Tetsuya Uemura
Abstract: Provided are a ferrite carrier core material for an electrophotographic developer having a full length L1 of grain boundary and a circumference length L2 of the core material in a cross-section of the core material, and satisfying a relationship of 2≤L1/L2≤9; a carrier for an electrophotographic developer including the ferrite carrier core material and a coating layer containing a resin provided on a surface of the ferrite carrier core material; and an electrophotographic developer including the carrier and a toner.
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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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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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