Electromagnetic field absorbing composition
US-2016254600-A1 · Sep 1, 2016 · US
Ferrite particle powder for electromagnetic wave absorption, method for manufacturing same, and resin composition using said ferrite particle powder for electromagnetic wave absorption
US2025118471A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2025118471-A1 |
| Application number | US-202318836537-A |
| Country | US |
| Kind code | A1 |
| Filing date | Feb 7, 2023 |
| Priority date | Feb 10, 2022 |
| Publication date | Apr 10, 2025 |
| Grant date | — |
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Abstract
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Provided is a ferrite particle powder for electromagnetic wave absorption that can maintain flexibility and uniformity of physical properties of a sheet even when the sheet is highly filled with the ferrite particle powder and is excellent in electromagnetic wave absorbing performance in a GHz band. The ferrite particle powder is a ferrite particle powder for electromagnetic wave absorption, the ferrite particle powder containing magnetoplumbite-type ferrite represented by a chemical formula of A x Fe (12-y) (Ti z Mn (1-z) ) y O 19 , where A is at least one selected from Ba, Sr, Ca, and Pb, x is 0.9 to 1.1, y is 5.0 or less, and z is 0.35 to 0.65, and the ferrite particle powder having: a compressed density of 3.00 g/cm 3 or more; and an average particle diameter of 0.50 to 3.0 μm determined by an air permeability method (Blaine method).
First claim
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1 . A ferrite particle powder for electromagnetic wave absorption, the ferrite particle powder comprising magnetoplumbite-type ferrite represented by a chemical formula of A x Fe (12-y) (Ti z Mn (1-z) ) y O 19 , where A is at least one selected from Ba, Sr, Ca, and Pb, x is 0.9 to 1.1, y is 5.0 or less, and z is 0.35 to 0.65, and the ferrite particle powder having: a compressed density of 3.00 g/cm 3 or more; and an average particle diameter of 0.50 to 3.0 μm determined by an air permeability method (Blaine method). 2 . The ferrite particle powder for electromagnetic wave absorption according to claim 1 , the ferrite particle powder having a specific surface area of 0.50 to 4.0 m 2 /g. 3 . A method for manufacturing the ferrite particle powder for electromagnetic wave absorption according to claim 1 , the method comprising: mixing, molding, and firing an iron raw material, a titanium raw material, a manganese raw material, and a compound raw material of an element A to produce magnetoplumbite-type ferrite; pulverizing the magnetoplumbite-type ferrite; and annealing the pulverized magnetoplumbite-type ferrite. 4 . A resin composition comprising the ferrite particle powder for electromagnetic wave absorption according to claim 1 and a resin. 5 . A resin composition comprising the ferrite particle powder for electromagnetic wave absorption according to claim 2 and a resin.
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Calcium oxide or oxide-forming salts thereof, e.g. lime · CPC title
Strontium oxides or oxide-forming salts thereof · CPC title
Other ferrites containing alkaline earth metals or lead · CPC title
Density · CPC title
expressed by specific surface values · CPC title
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- What does patent US2025118471A1 cover?
- Provided is a ferrite particle powder for electromagnetic wave absorption that can maintain flexibility and uniformity of physical properties of a sheet even when the sheet is highly filled with the ferrite particle powder and is excellent in electromagnetic wave absorbing performance in a GHz band. The ferrite particle powder is a ferrite particle powder for electromagnetic wave absorption, th…
- Who is the assignee on this patent?
- Toda Kogyo Corp
- What technology area does this patent fall under?
- Primary CPC classification H05K9/0083. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Thu Apr 10 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).