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Flame Retardant Powder for Magnetic Member, and Polymer Composition
US2022119713A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2022119713-A1 |
| Application number | US-201917424225-A |
| Country | US |
| Kind code | A1 |
| Filing date | Dec 17, 2019 |
| Priority date | Jan 21, 2019 |
| Publication date | Apr 21, 2022 |
| Grant date | — |
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Abstract
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Provided is a powder which has a high saturation magnetic flux density and excellent flame retardancy. This powder is a flame retardant powder for a magnetic member, and includes a plurality of flaky particles. These particles are composed of an Fe—Si-based alloy containing 7% by mass or more and 12% by mass or less of Si. The content of Si in terms of percentage by mass, P(Si), in this alloy and the flame retardancy parameter P NF satisfy the following mathematical formulae (I) and (II): (−0.97×P(Si)+13.0)<P NF ≤10 (I), P NF =D50×TD/ρ (II), wherein, D50 represents the median diameter of the powder, TD represents the tap density of the powder, and ρ represents the true density of the powder.
First claim
Opening claim text (preview).
1 . A flame retardant powder for magnetic members, comprising a plurality of flaky particles, wherein the flaky particle is composed of an Fe—Si based alloy comprising 7% by mass or more and 12% by mass or less of Si, and a content of Si in terms of percentage by mass, P(Si), in the alloy and a flame retardancy parameter, P NF , satisfy following mathematical formulae (I) and (II): (−0.97×P(Si)+13.0)<P NF ≤10 (I) P NF =D50×TD/ρ (II) wherein D50 represents a median diameter of the powder, TD represents a tap density of the powder, and ρ represents a true density of the powder, and wherein the flame retardant powder has a saturation magnetic flux density of 1.3 T or more. 2 . (canceled) 3 . A polymer composition for magnetic members, comprising a base polymer and a flame retardant powder dispersed in the base polymer, wherein the flame retardant powder comprises a plurality of flaky particles, the flaky particle is composed of an Fe—Si based alloy comprising 7% by mass or more and 12% by mass or less of Si, and a content of Si in terms of percentage by mass, P(Si), in the alloy and a flame retardancy parameter, P NF , in the powder satisfy following mathematical formulae (I) and (II): (−0.97×P(Si)+13.0)<P NF ≤10 (I) P NF =D50×TD/ρ (II) wherein D50 represents a median diameter of the powder, TD represents a tap density of the powder, and ρ represents a true density of the powder, and wherein the flame retardant powder has a saturation magnetic flux density of 1.3 T or more.
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Classifications
Flame-proofing or flame-retarding additives · CPC title
Compounds containing metals of Groups 4 to 10 or of Groups 14 to 16 of the Periodic Table · CPC title
containing silicon · CPC title
- C09K21/02Primary
Inorganic materials · CPC title
by macromolecular organic substances · CPC title
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- What does patent US2022119713A1 cover?
- Provided is a powder which has a high saturation magnetic flux density and excellent flame retardancy. This powder is a flame retardant powder for a magnetic member, and includes a plurality of flaky particles. These particles are composed of an Fe—Si-based alloy containing 7% by mass or more and 12% by mass or less of Si. The content of Si in terms of percentage by mass, P(Si), in this alloy a…
- Who is the assignee on this patent?
- Sanyo Special Steel Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification C09K21/02. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Thu Apr 21 2022 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).