Ferrite powder, resin composition, and molded article

Patent metadata

Field	Value
Publication number	US-2019040226-A1
Application number	US-201716083533-A
Country	US
Kind code	A1
Filing date	Mar 27, 2017
Priority date	Mar 31, 2016
Publication date	Feb 7, 2019
Grant date	—

Abstract

Ferrite powder of the present invention is ferrite powder detectable with a metal detector, comprising: hard ferrite particles containing Sr of 7.8 mass % or more and 9.0 mass % or less and Fe of 61.0 mass % or more and 65.0 mass % or less, wherein an amount of Na to be measured by ion chromatography is 1 ppm or more and 200 ppm 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 residual magnetization by a VSM measurement when magnetic field of 10 K·1000/4πA/m is applied is 25 A·m2/kg or more and 40 A·m2/kg or less.

First claim

1 . Ferrite powder detectable with a metal detector, comprising:
hard ferrite particles containing Sr of 7.8 mass % or more and 9.0 mass % or less and Fe of 61.0 mass % or more and 65.0 mass % or less, wherein an amount of Na to be measured by ion chromatography is 1 ppm or more and 200 ppm or less.

2 . The ferrite powder as claimed in 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 as claimed in claim 1 , wherein residual magnetization by a VSM measurement when a magnetic field of 10 K·1000/4πA/m is applied is 25 A·m 2 /kg or more and 40 A·m 2 /kg or less.

4 . The ferrite powder as claimed in claim 1 , wherein coercive force by a VSM measurement when a magnetic field of 10 K·1000/4πA/m is applied is 39.7 kA/m or more and 320 kA/m or less.

5 . The ferrite powder as claimed in claim 1 , wherein an amount of Cl to be measured by the ion chromatography is 1 ppm or more and 100 ppm or less.

6 . The ferrite powder as claimed in claim 1 , wherein an amount of S to be measured by the ion chromatography is 1 ppm or more and 1000 ppm or less.

7 . A resin composition, comprising:
the ferrite powder as claimed in claim 1 ; and a resin material.

8 . The resin composition as claimed in claim 7 , wherein the ferrite powder is dispersedly present in the resin material.

9 . The resin composition as claimed in claim 7 , wherein a content rate of the ferrite powder in the resin composition is 5.0 mass % or more and 90 mass % or less.

10 . The resin composition as claimed in claim 7 , 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.

11 . A molded body having a portion formed by using the resin composition as claimed in claim 7 .

12 . The molded body as claimed in claim 11 , wherein a content rate of the ferrite powder is 2.0 mass % or more and 20 mass % or less.

13 . The molded body as claimed in claim 11 , wherein the molded body is used in a field for manufacturing, processing and packaging of a food.

14 . The molded body as claimed in claim 13 , wherein the molded body is used for a part or all of a cooking utensil, a food preparation tool or a food packaging member.

15 . The molded body as claimed in claim 11 , 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

• B65D65/38

  Packaging materials of special type or form · CPC title

• C01G49/0036

  containing one alkaline earth metal, magnesium or lead · CPC title

• C01P2004/32

  Spheres · CPC title

• C01P2006/42

  Magnetic properties · CPC title

• C08L101/00

  Compositions of unspecified macromolecular compounds · CPC title