Composition, magnetic particles containing hardened material, magnetic particles introduced into substrate, electronic materials

Abstract

To provide a composition that can form a cured product with high magnetic permeability and low magnetic loss, has excellent hole-filling suitability, and also exhibits excellent storage stability. [Solution] A composition comprising magnetic particles and an organic solvent, wherein the magnetic particles include magnetic particles X having a sphericity of 100 to 120, the magnetic particles X include ferrite particles, the content of magnetic particles with an equivalent circle diameter of less than 11 μm is 15 to 70% by mass of the total mass of magnetic particles X, and the volume average particle diameter of magnetic particles X is 5 to 50 μm.

Claims

1. A composition comprising magnetic particles and an organic solvent, The magnetic particles include magnetic particles X having a sphericity of 100 to 120. The magnetic particle X includes ferrite particles, Of the magnetic particles X, the content of magnetic particles with an equivalent circular diameter of less than 11 μm is 15 to 70% by mass of the total mass of the magnetic particles X. The volume-average particle diameter of the magnetic particle X is 5 to 50 μm. The ferrite particles are spinel ferrites, The composition wherein the content of the ferrite particles is 50% by mass or less relative to the total mass of the magnetic particles X.

2. The composition according to claim 1, wherein the magnetic particles X further comprise alloy particles.

3. The composition according to claim 2, wherein the magnetic particles having an equivalent circular diameter of less than 11 μm are alloy particles, and the magnetic particles having an equivalent circular diameter of 11 μm or more are ferrite particles.

4. The composition according to claim 2 or 3, wherein the Fe atom content in the alloy particles is 50% by mass or more relative to the metal atom content.

5. The composition according to any one of claims 1 to 4, wherein the ferrite particles contain Ni atoms.

6. The BET specific surface area of ​​the ferrite particle is 0.25 m². ２ The composition according to any one of claims 1 to 5, wherein the amount is less than or equal to / g.

7. Furthermore, the composition according to any one of claims 1 to 6, comprising one or more binder components selected from the group consisting of resins and resin precursors.

8. The composition according to claim 7, wherein the binder component comprises at least one epoxy compound and an oxetane compound.

9. The composition according to any one of claims 1 to 8, wherein at least a portion of the magnetic particles X has a surface layer on its surface.

10. The composition according to claim 9, wherein the surface layer is an organic layer.

11. The composition according to any one of claims 1 to 10, wherein the content of the organic solvent is 1 to 15% by mass with respect to the total mass of the composition.

12. The composition according to any one of claims 1 to 11, wherein the magnetic particles X include alloy particles containing Fe atoms with a volume average particle diameter of 3 to 5 μm.

13. A cured product containing magnetic particles, formed using the composition described in any one of claims 1 to 12.

14. A magnetic particle introduction substrate comprising a substrate having holes formed therein, and a magnetic particle-containing cured material according to claim 13 disposed within the holes.

15. An electronic material comprising a magnetic particle introduction substrate as described in claim 14.

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