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：US20160044838A1

公开(公告)日：2016-02-11

申请号：US14780715

申请日：2014-03-18

Applicant: POWDERTECH CO., LTD.

Inventor： Koji AGA ,  Tetsuya IGARASHI

IPC: H05K9/00 ,  H01F1/20 ,  H01F1/147 ,  B22F1/00

CPC classification number: H05K9/0075 ,  B22F1/0003 ,  B22F1/02 ,  C22C2202/02 ,  H01F1/14766 ,  H01F1/20 ,  H01F1/26

Abstract: The object is to provide a composite magnetic powder for noise suppression to give a noise suppressor having ability to suppress the noise in a wide range from a low frequency through a high frequency while suppressing heat generation by reducing a dielectric constant loss on the high frequency side, and in order to attain the object, there is employed a composite magnetic powder for noise suppression in which the surface of a metallic powder is coated with a fine particle having a high dielectric constant and a binder resin or the like. By using this composite magnetic powder for noise suppression, there can be provided a noise suppressor excellent in ability to suppress the noise in a wide frequency region.

Abstract translation: 本发明的目的是提供一种用于噪声抑制的复合磁粉，以提供具有从低频到高频抑制宽范围内的噪声的噪声抑制器，同时通过降低高频侧的介电常数损失来抑制发热 为了达到上述目的，采用了用金属粉末的表面涂布高介电常数的微粒和粘结剂树脂等的噪声抑制用复合磁粉。 通过使用该复合磁粉进行噪声抑制，可以提供在宽频率区域抑制噪声的能力优异的噪声抑制器。