Dust core and electronic device

Patent metadata

Field	Value
Publication number	US-12548701-B2
Application number	US-202217831665-A
Country	US
Kind code	B2
Filing date	Jun 3, 2022
Priority date	Jun 10, 2021
Publication date	Feb 10, 2026
Grant date	Feb 10, 2026

Abstract

A dust core includes a binder and magnetic particles. The binder includes an epoxy resin. The magnetic particles are dispersed in the binder. The epoxy resin has at least two or more mesogenic skeletons between two epoxy bonds adjacent along a molecular chain.

First claim

What is claimed is:

1 . A dust core comprising:
a binder including an epoxy resin; and magnetic particles dispersed in the binder, wherein the epoxy resin has at least two or more mesogenic skeletons between two epoxy bonds adjacent along a molecular chain.

2 . The dust core according to claim 1 , wherein
the magnetic particles comprise metal magnetic particles, and an amount of the binder with respect to 100 parts by mass of the metal magnetic particles is 1.0 part by mass or more and 4.0 parts by mass or less.

3 . The dust core according to claim 1 , wherein the mesogenic skeletons have a structure represented by the following formula (I),

where Y of the formula (I) is selected from —H, an alkyl group with 4 or less carbon atoms, an acetyl group, and a halogen,
Y(s) in the mesogenic skeletons may be all the same or different from each other, and
* represents a binding site with an adjacent atom.

4 . The dust core according to claim 1 , wherein the mesogenic skeletons have a structure represented by the following formula (J),

where Y of the formula (J) is selected from a hydrogen, an alkyl group with 4 or less carbon atoms, an acetyl group, and a halogen,
Y(s) in the mesogenic skeletons may be all the same or different from each other,
* represents a binding site with an adjacent atom, and
X is at least one linking group selected from a group consisting of:

5 . An inductor comprising the dust core according to claim 1 .

6 . The inductor according to claim 5 , wherein R A /R B >0.001 is satisfied, where R A is a volume resistance after keeping the inductor at 175° C. for 100 hours, and R B is a volume resistance before keeping the inductor at 175° C. for 100 hours.

Assignees

• Tdk Corp

Inventors

• Taniguchi Yusuke
• Seki Junichi
• Shimamura Junichi

Classifications

• H01F27/255 Primary

  made from particles (H01F27/26 takes precedence) · CPC title

• H01F27/24

  Magnetic cores · CPC title

• H01F3/00

  Cores, Yokes, or armatures (magnetic materials H01F1/00; permanent magnets H01F7/02) · CPC title

• C08G59/245 Primary

  aromatic · CPC title

• C08G59/308

  containing halogen atoms · CPC title