Ferrite powder, resin composition, and molded article

Patent metadata

Field	Value
Publication number	US-11072537-B2
Application number	US-201716095710-A
Country	US
Kind code	B2
Filing date	Apr 11, 2017
Priority date	May 6, 2016
Publication date	Jul 27, 2021
Grant date	Jul 27, 2021

Abstract

Ferrite powder of the present invention is ferrite powder detectable with a metal detector, comprising: soft ferrite particles containing Mn of 3.5 mass % or more and 20.0 mass % or less and Fe of 50.0 mass % or more and 70.0 mass % or less. It is preferable that a volume average particle diameter of the particles constituting the ferrite powder is 0.1 μm or more and 100 μm or less. It is preferable that magnetization by a VSM measurement when magnetic field of 5 K·1000/4πA/m is applied is 85 A·m 2 /kg or more and 98 A·m 2 /kg or less.

First claim

What is claimed is:

1. Ferrite powder detectable with a metal detector, comprising:
soft ferrite particles containing Mn of 3.5 mass % or more and 20.0 mass % or less and Fe of 50.0 mass % or more and 70.0 mass % or less,
wherein coercive force of the soft ferrite particles by a VSM measurement when a magnetic field of 5 k·1000/4π A/m is applied is 550 A/m or more and 6500 A/m or less.

2. The ferrite powder according to claim 1 , wherein a volume average particle diameter of the particles constituting the ferrite powder is 0.1 μm or more and 100 μm or less.

3. The ferrite powder according to claim 1 , wherein magnetization by the VSM measurement when the magnetic field of 5 k·1000/4π A/m is applied is 85 A·m 2 /kg or more and 98 A·m 2 /kg or less.

4. A resin composition, comprising:
the ferrite powder according to claim 1 ; and
a resin material.

5. The resin composition according to claim 4 , wherein the ferrite powder is dispersedly present in the resin material.

6. The resin composition according to claim 4 , wherein a content rate of the ferrite powder in the resin composition is 5.0 mass % or more and 90 mass % or less.

7. The resin composition according to claim 4 , wherein the resin material includes one kind or more kinds selected from the group consisting of polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol (PVA), a fluorine based resin, silicone rubber, butadiene rubber, a thermoplastic elastomer, an epoxy resin and a silicone resin.

8. A molded body having a portion formed by using the resin composition according to claim 4 .

9. The molded body according to claim 8 , wherein a content rate of the ferrite powder is 2.0 mass % or more and 20 mass % or less.

10. The molded body according to claim 8 , wherein the molded body is used in a field for manufacturing, processing and packaging of a food.

11. The molded body according to claim 10 , wherein the molded body is used for a part or all of a cooking utensil, a food preparation tool or a food packaging member.

12. The molded body according to claim 8 , wherein the molded body contains the ferrite powder in a region within 1.0 mm in a thickness direction from a surface thereof.

Assignees

• Powdertech Co Ltd

Inventors

• Aga Koji
• Igarashi Tetsuya

Classifications

• C01G49/0072 Primary

  containing manganese · CPC title

• H01F1/37

  in a bonding agent · CPC title

• H05B6/74

  Mode transformers or mode stirrers · CPC title

• C04B35/2658

  Other ferrites containing manganese or zinc, e.g. Mn-Zn ferrites · CPC title

• C08L101/00

  Compositions of unspecified macromolecular compounds · CPC title