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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：US20210168974A1
公开(公告)日：2021-06-03
申请号：US16636279
申请日：2018-08-02
Applicant: POWDERTECH CO., LTD.
Inventor： Koji AGA
Abstract: The present invention provides: composite particles each comprising a base particle composed of ferrite, and a coating layer composed of a material containing at least one element selected from the group consisting of Au, Ag, Pt, Ni and Pd; a powder characterised by containing a plurality of the composite particles; a resin composition characterised by containing the powder and a resin material; and a moulded body characterised by being produced using a material containing the powder and the resin material.
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公开(公告)号：US10996576B2
公开(公告)日：2021-05-04
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.-
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：US20200003268A1
公开(公告)日：2020-01-02
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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Patent Agency Ranking
公开(公告)号：US20190343027A1
公开(公告)日：2019-11-07
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：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
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：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
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：US20190204761A1
公开(公告)日：2019-07-04
申请号：US15779501
申请日：2018-03-06
Applicant: POWDERTECH CO., LTD.
Inventor： Hiroki SAWAMOTO , Tetsuya UEMURA
CPC classification number: G03G9/1075 , G03G9/0819 , G03G9/107 , G03G9/1131 , G03G9/1139
Abstract: To provide a magnetic core material for electrophotographic developer and carrier for electrophotographic developer which are excellent in a rising-up of charge amount, can suppress a carrier scattering, and can stably provide good images; a developer containing the carrier; a method for producing the magnetic core material for electrophotographic developer; a method for producing the carrier for electrophotographic developer; and a method for producing the developer.The magnetic core material for electrophotographic developer, containing a sulfur component in a content of from 1 to 45 ppm in terms of a sulfate ion.
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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
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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