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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：US20210047200A1
公开(公告)日：2021-02-18
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
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：US10754271B2
公开(公告)日：2020-08-25
申请号：US16474508
申请日：2017-12-25
Applicant: POWDERTECH CO., LTD.
Inventor： Hiroki Sawamoto , Tetsuya Uemura
Abstract: A magnetic core material for electrophotographic developer, satisfying a value of Expression (1): a+b×10+c+d+e+f, being from 300 to 1,300, when an amount of fluorine ion is denoted by a (ppm), an amount of chlorine ion is denoted by b (ppm), an amount of bromide ion is denoted by c (ppm), an amount of nitrite ion is denoted by d (ppm), an amount of nitrate ion is denoted by e (ppm), and an amount of sulfate ion is denoted by f (ppm), which are measured by combustion ion chromatography, and having a BET specific surface area being from 0.06 to 0.25 m2/g.
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84.发明申请公开(公告)号：US20200251263A1
公开(公告)日：2020-08-06
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
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：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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Patent Agency Ranking
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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87.发明申请公开(公告)号：US20190339628A1
公开(公告)日：2019-11-07
申请号：US16474497
申请日：2017-12-25
Applicant: POWDERTECH CO., LTD.
Inventor： Hiroki SAWAMOTO , Tetsuya UEMURA
Abstract: Provided are a magnetic core material for electrophotographic developer and a carrier for electrophotographic developer, which are excellent in charge characteristics and strength and with which a satisfactory image free from defects can be obtained, and a developer containing the carrier.A magnetic core material for electrophotographic developer, having a sulfur component content of from 50 to 700 ppm in terms of a sulfate ion and a BET specific surface area of from 0.06 to 0.25 m2/g.
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公开(公告)号：US20190086829A1
公开(公告)日：2019-03-21
申请号：US16084420
申请日：2017-03-29
Applicant: POWDERTECH CO., LTD.
Inventor： Takao SUGIURA , Kazutaka ISHII , Koji AGA
CPC classification number: G03G9/1075 , C01G49/0036 , C01G49/0072 , C01P2002/52 , C01P2004/61 , C01P2004/84 , C01P2006/42 , G03G9/0819 , G03G9/107 , G03G9/1131 , G03G9/1136
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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公开(公告)号：US20190079422A1
公开(公告)日：2019-03-14
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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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
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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