公开(公告)号：US20180074426A1

公开(公告)日：2018-03-15

申请号：US15696698

申请日：2017-09-06

Applicant: POWDERTECH CO., LTD.

Inventor： Hiroki SAWAMOTO ,  Hajime AKIBA ,  Tetsuya UEMURA

IPC: G03G9/113 ,  G03G9/107

CPC classification number: G03G9/1133 ,  G03G9/10 ,  G03G9/107 ,  G03G9/1075 ,  G03G9/1131 ,  G03G9/1132 ,  G03G9/1136

Abstract: An object of the present invention is to provide a carrier low in specific gravity and less in both environmental fluctuation and change of the charge amount after aging, an electrophotographic developer using the carrier, and a method of manufacturing the carrier. To achieve the object, the carrier is manufactured by coating a core material composed of a magnetic component and a non-magnetic component with a resin, and the carrier is characterized in that water content is 200 ppm or less and cyclic siloxane content is 100 ppb or less. Further, an electrophotographic developer containing the carrier is provided.

公开(公告)号：US20180009677A1

公开(公告)日：2018-01-11

申请号：US15544626

申请日：2016-01-21

Applicant: POWDERTECH CO., LTD.

Inventor： Koji AGA ,  Tetsuya IGARASHI

IPC: C01G49/00 ,  H01F1/113 ,  H05K9/00

CPC classification number: C01G49/0036 ,  C01G49/00 ,  C01P2004/22 ,  C01P2004/54 ,  C01P2004/61 ,  C01P2006/42 ,  H01F1/113 ,  H01F1/348 ,  H01F1/37 ,  H05K9/00 ,  H05K9/0081

Abstract: Objects are to provide a ferrite powder having a residual magnetization and a coercive force larger than those of spherical hard ferrite particle, and magnetic permeability μ″ is maximum in a specific frequency range, a manufacturing method thereof, a resin compound containing the ferrite powder, and a molded product made from the resin compound. To achieve the objects, a hexagonal plate shaped ferrite powder containing 7.8 to 9 wt % of Sr, 61 to 65 wt % of Fe, and 0.1 to 0.65 wt % of Mg, a manufacturing method thereof, a resin compound containing the hexagonal plate shaped ferrite powder, and a molded product made from the resin compound are employed.

公开(公告)号：US20180008966A1

公开(公告)日：2018-01-11

申请号：US15544665

申请日：2016-01-26

Applicant: POWDERTECH CO., LTD.

Inventor： Koji AGA ,  Takao SUGIURA

IPC: B01J23/889 ,  B01J23/89 ,  B01J35/00 ,  B01J35/02

CPC classification number: B01J23/8892 ,  B01J23/002 ,  B01J23/005 ,  B01J23/745 ,  B01J23/889 ,  B01J23/89 ,  B01J23/8906 ,  B01J23/8913 ,  B01J23/892 ,  B01J23/8926 ,  B01J23/8986 ,  B01J32/00 ,  B01J35/0006 ,  B01J35/0013 ,  B01J35/002 ,  B01J35/0026 ,  B01J35/0033 ,  B01J35/004 ,  B01J35/008 ,  B01J35/023 ,  B01J35/08 ,  B01J35/1009 ,  B01J37/0018 ,  B01J37/0036 ,  B01J37/0063 ,  B01J37/0211 ,  B01J37/088 ,  B01J37/16 ,  B01J2523/00 ,  C01G23/047 ,  C01G49/0072 ,  C01P2002/50 ,  C01P2002/52 ,  C01P2004/03 ,  C01P2004/84 ,  C01P2006/12 ,  C01P2006/14 ,  C01P2006/16 ,  G03G9/107 ,  G03G9/113 ,  G03G9/1139 ,  B01J2523/22 ,  B01J2523/24 ,  B01J2523/47 ,  B01J2523/72 ,  B01J2523/842 ,  B01J2523/19 ,  B01J2523/18 ,  B01J2523/17 ,  B01J2523/828 ,  B01J2523/822 ,  B01J2523/821 ,  B01J2523/824 ,  B01J2523/847 ,  B01J2523/845

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.

公开(公告)号：US20170301443A1

公开(公告)日：2017-10-19

申请号：US15511727

申请日：2015-09-02

Applicant: POWDERTECH CO., LTD.

Inventor： Koji AGA ,  Tetsuya IGARASHI

IPC: H01F1/34 ,  C09D157/06 ,  C01G49/00 ,  C09D7/12 ,  C08K3/00 ,  C08K9/02 ,  C08K9/06

Abstract: An object is to provide the ferrite particles used as a magnetic filler or a raw material for a molded product excellent in dispersibility as a powder and excellent in uniformity after molding and result the surface with small unevenness; and a method of manufacturing the particles. To achieve the object, Mn—Mg ferrite particles having an average particle size of 1 to 2000 nm and having a spherical shape are employed. It is preferable that the ferrite particles are produced by a method including subjecting of a ferrite raw material obtained through preparation of a ferrite composition to flame-spraying in air for ferritization followed by rapid cooling for solidifying of the ferrite.

公开(公告)号：US20040229151A1

公开(公告)日：2004-11-18

申请号：US10773559

申请日：2004-02-06

Applicant: POWDERTECH CO., LTD.

Inventor： Hiromichi Kobayashi ,  Issei Shinmura ,  Tsuyoshi Itagoshi ,  Yuji Sato

IPC: G03G009/107

CPC classification number: G03G9/107 ,  G03G9/10 ,  G03G9/1136 ,  Y10T428/25

Abstract: A carrier core material containing at least one metal oxide (MLO) having a melting point of not higher than 1000null C. and at least one metal oxide (MHO) having a melting point of not lower than 1800null C., wherein the metal (MH) for constituting the metal oxide (MHO) has an electrical resistivity of not less than 10null5 nullnullcm. Also disclosed is a two-component developing agent comprising a coated carrier, which comprises the carrier core material coated with a resin, and toner particles. Further disclosed is an image forming method comprising developing an electrostatic latent image formed on a photosensitive member with the two-component developing agent using an alternating electric field. The carrier core material and the coated carrier have high magnetization and are free from occurrence of leakage of electric charge over a wide range of electric field from low electric field to high electric field. According to the two-component developing agent of the invention, an excellent image can be formed.

Abstract translation: 一种载体芯材，其含有熔点不高于1000℃的至少一种金属氧化物（M L）和至少一种熔点不低于的金属氧化物（MH）） 1800℃，其中用于构成金属氧化物（M H）的金属（M H））的电阻率不小于10 -5Ω·cm -1。 还公开了一种双组分显影剂，其包括涂覆载体，其包含涂覆有树脂的载体芯材料和调色剂颗粒。 进一步公开的是一种图像形成方法，其包括使用交变电场用双组分显影剂显影形成在感光构件上的静电潜像。 载体芯材和涂层载体具有高磁化强度，并且在从低电场到高电场的宽电场范围内不会发生电荷泄漏。 根据本发明的双组分显影剂，可以形成优异的图像。

公开(公告)号：US12253825B2

公开(公告)日：2025-03-18

申请号：US17433593

申请日：2020-02-20

Applicant: POWDERTECH CO., LTD.

Inventor： Makoto Ishikawa ,  Tetsuya Uemura

IPC: G03G9/107 ,  C01G49/00 ,  C01G49/06 ,  G03G9/113 ,  H01F1/34 ,  H01F1/36

Abstract: The present invention relates to a ferrite particle, containing a crystal phase component containing a perovskite crystal represented by the compositional formula:
RZrO3 (provided that R represents an alkaline earth metal element), and having an apparent density in a range represented by the following formula: 1.90≤Y≤2.45 provided that Y in the formula is the apparent density (g/cm3) of the ferrite particle.

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：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

IPC: H01F1/34 ,  H01F1/33 ,  H01F1/37 ,  H01F27/255 ,  C01G49/00 ,  C30B29/22

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.

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

IPC: F16D69/02 ,  C01G49/06

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.

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

IPC: H01F1/11 ,  B29C41/08 ,  G11B5/706 ,  G11B5/714 ,  H01F1/113

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.