公开(公告)号：US20240128001A1

公开(公告)日：2024-04-18

申请号：US18275785

申请日：2022-02-09

Applicant: POWDERTECH CO., LTD.

Inventor： Kazutaka ISHII ,  Koji AGA

IPC: H01F1/34

CPC classification number: H01F1/344

Abstract: A magnetic composite includes a resin base material and a ferrite layer provided on a surface of the resin base material, the resin base material has a thickness of 10 μm or more, and the ferrite layer has a thickness of 2.0 μm or more, contains spinel-type ferrite as a principal component, and has a ratio of 0.00 or more and 0.03 or less, wherein the ratio is of an integrated intensity of a 222 plane to an integrated intensity of a 311 plane in X-ray diffraction analysis.

公开(公告)号：US20240079172A1

公开(公告)日：2024-03-07

申请号：US18261237

申请日：2022-01-13

Applicant: POWDERTECH CO., LTD.

Inventor： Kazutaka ISHII ,  Koji AGA

IPC: H01F10/20

CPC classification number: H01F10/20

Abstract: A magnetic composite includes a metal base material and a ferrite layer provided on a surface of the metal base material, the metal base material has a thickness of 0.001 μm or more, and the ferrite layer has a thickness of 2.0 μm or more, contains spinel-type ferrite as a principal component, and has a ratio of 0.00 or more and 0.03 or less, the ratio being of an integrated intensity of a (222) plane to an integrated intensity of a (311) plane in X-ray diffraction analysis.

公开(公告)号：US20190341177A1

公开(公告)日：2019-11-07

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

IPC: H01F1/375 ,  G03G9/107 ,  C22C38/08 ,  C22C38/16

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.

公开(公告)号：US20190300379A1

公开(公告)日：2019-10-03

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

IPC: C01G49/00 ,  C08K3/22 ,  C08K7/18 ,  C30B29/22 ,  C30B29/60 ,  H01F1/34 ,  H05K9/00

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.

公开(公告)号：US20190161362A1

公开(公告)日：2019-05-30

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: C01G49/00 ,  C08K3/22 ,  C08K7/18 ,  H01F1/375

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.

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

IPC: C01G49/00 ,  C08L29/04 ,  H05K9/00

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.

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

IPC: H01F1/34 ,  C01G49/00 ,  C30B29/22

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.

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

IPC: G03G9/107 ,  G03G9/113 ,  G03G9/08 ,  C01G49/00

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.

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

IPC: G03G9/093 ,  G03G9/107 ,  G03G9/113

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.