公开(公告)号：US20200185135A1

公开(公告)日：2020-06-11

申请号：US16702629

申请日：2019-12-04

Applicant: DOWA ELECTRONICS MATERIALS CO., LTD. ,  FUJIFILM Corporation

Inventor： Hirohisa OMOTO ,  Shuji KANEDA ,  Hiroyuki SUZUKI ,  Toshio TADA

IPC: H01F1/34 ,  G11B5/73

Abstract: Provided is a hexagonal ferrite magnetic powder for a magnetic recording medium, containing hexagonal ferrite magnetic particles having aluminum hydroxide adhered on the surface thereof, the hexagonal ferrite magnetic powder having an Al/Fe molar ratio of 0.030 to 0.200, a Co/Fe molar ratio of 0.002 to 0.030, and a Nb/Fe molar ratio of 0.005 to 0.050, and having an Fe site valence AFe of 3.015 to 3.040 as calculated by AFe=(3+2×[Co/Fe]+5×[Nb/Fe])/(1+[Co/Fe]+[Nb/Fe]) wherein [Co/Fe] represents the Co/Fe molar ratio and [Nb/Fe] represents the Nb/Fe molar ratio, and preferably having an activation volume Vact of 1400 to 1800 nm3. This magnetic powder simultaneously achieves an increase in magnetic characteristics including SNR of a magnetic recording medium and a further increase in durability thereof.

公开(公告)号：US20180077798A1

公开(公告)日：2018-03-15

申请号：US15552282

申请日：2015-12-16

Applicant: DOWA ELECTRONICS MATERIALS CO., LTD.

Inventor： Hidefumi FUJITA ,  Shuji KANEDA ,  Daisuke ITOH

IPC: H05K1/09 ,  H05K1/03 ,  H01B1/22 ,  H05K3/12 ,  H01B3/44 ,  B05D3/06 ,  B05D3/12

CPC classification number: H05K1/097 ,  B05D3/06 ,  B05D3/12 ,  H01B1/22 ,  H01B3/448 ,  H01B5/00 ,  H01B5/14 ,  H01B13/00 ,  H05K1/0386 ,  H05K3/12 ,  H05K3/1291 ,  H05K2203/0278

Abstract: To provide a copper electroconductive film formed on a paper substrate, the copper electroconductive film being considerably improved in weather resistance and electroconductivity. The problem can be achieved by an electroconductive film formed by pressing a sintered electroconductive film formed by sintering copper particles in a coating film containing copper powder on a paper substrate along with the substrate, the electroconductive film having an area ratio of copper occupying on a cross section of the electroconductive film in parallel to a thickness direction thereof of 82.0% or more. The electroconductive film can be produced by pressing, for example, by roll press to from 90 to 190° C., after light sintering.

公开(公告)号：US20200161035A1

公开(公告)日：2020-05-21

申请号：US16683301

申请日：2019-11-14

Applicant: DOWA ELECTRONICS MATERIALS CO., LTD. ,  FUJIFILM Corporation

Inventor： Hirohisa OMOTO ,  Shuji KANEDA ,  Satoshi SHIKI ,  Hiroyuki SUZUKI ,  Toshio TADA

IPC: H01F1/34 ,  C09C1/24

Abstract: Provided is an Al-containing hexagonal ferrite magnetic powder which produces an excellent durability-improving effect on a magnetic recording medium, wherein uniform pulverization of the magnetic powder can be easily achieved by dispersion treatment in preparation of a magnetic coating material even in cases where the magnetic powder has a small primary particle size or has a composition which is likely to produce hard secondary particles. The magnetic powder for a magnetic recording medium is an Al-containing hexagonal ferrite magnetic powder having an Al/Fe molar ratio of 0.030 to 0.200, and has a particle size distribution in which the volume ratio of particles having a particle size of 30 μm or more as measured by a laser diffraction particle size distribution analyzer with a dispersion pressure of 100 kPa is 5.0% or less, and an activation volume Vact of 1800 nm3 or less.

公开(公告)号：US20150243400A1

公开(公告)日：2015-08-27

申请号：US14678665

申请日：2015-04-03

Applicant: DOWA Electronics Materials Co., Ltd.

Inventor： Shuji KANEDA ,  Kimikazu MOTOMURA ,  Tatsuya KARIYASU ,  Yutaka HISAEDA ,  Kosuke IHA

IPC: H01B1/02 ,  B22F1/00 ,  H01B1/16 ,  C22C5/08

CPC classification number: H01B1/02 ,  B22F1/0014 ,  B22F1/0018 ,  B22F1/0022 ,  B22F1/0062 ,  B22F1/0074 ,  B22F9/24 ,  B82Y30/00 ,  C01P2004/04 ,  C01P2004/64 ,  C01P2006/11 ,  C01P2006/12 ,  C09C1/62 ,  C09D5/24 ,  C09D17/006 ,  C22C5/06 ,  C22C5/08 ,  H01B1/16 ,  H01B1/22 ,  H01M4/38

Abstract: A method suitable for mass production of nanoparticles with a uniform particle diameter is provided. It is an object to provide a powder of the nanoparticle obtained by this method, a dispersion containing the nanoparticles, and a paste containing the nanoparticles. There is provided a method for manufacturing silver particles including the step of reducing silver in a silver solution containing a protective agent composed of an organic material and a copper component in an amount of 1 to 1,000 ppm relative to the amount of silver to obtain particles having an average particle diameter (DTEM) of 5 to 100 nm as measured using a transmission electron microscope.

Abstract translation: 提供了适合大规模生产具有均匀粒径的纳米颗粒的方法。 本发明的目的是提供通过该方法获得的纳米颗粒的粉末，含有纳米颗粒的分散体和含有纳米颗粒的糊剂。 提供了一种制造银粒子的方法，其包括相对于银量将含有由有机材料和铜成分组成的保护剂的银溶液中的银还原为银的步骤，以获得具有 使用透射电子显微镜测定的平均粒径（DTEM）为5〜100nm。