Ferrite particles, carrier for electrophotographic developer, electrophotographic developer, and ferrite particle production method
US-2024254004-A1 · Aug 1, 2024 · US
Ferrite particles, carrier for electrophotographic development using same, and developer for electrophotography
US9740129B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9740129-B2 |
| Application number | US-201415031944-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 29, 2014 |
| Priority date | Nov 25, 2013 |
| Publication date | Aug 22, 2017 |
| Grant date | Aug 22, 2017 |
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Abstract
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Ferrite particles have, as a main component, a material represented by a composition formula M x Fe 3−x O 4 (where M is at least one type of metal selected from a group made of Mg, Mn, Ca, Ti, Cu, Zn, Sr and Ni, 0<x<1), where the maximum height Rz of the particles falls within a range of 1.40 μm to 1.90 μm, and the degree of distortion Rsk of the particles falls within a range of −0.25 to −0.07. In this way, when the ferrite particles are used as the carrier of an electrophotographic image forming apparatus, even if an image formation speed is increased, the occurrence of a failure is reduced for a long period of time.
First claim
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The invention claimed is: 1. Ferrite particles comprising grains that include, as a main component, a material represented by a composition formula M x Fe 3−x O 4 where M is at least one type of metal selected from the group consisting of Mg, Mn, Ca, Ti, Cu, Zn, Sr and Ni, and 0<x<1, wherein a maximum height Rz of a concave-convex-shaped surface of the grains is within a range of 1.40 μm to 1.90 μm, and a degree of distortion Rsk of the particles is within a range of −0.25 to −0.07. 2. An electrophotographic development carrier, comprising the ferrite particles according to claim 1 coated with a resin. 3. An electrophotographic developer, comprising the electrophotographic development carrier according to claim 2 and a toner. 4. The ferrite particles according to claim 1 , wherein the material represented by the composition formula M x Fe 3−x O 4 is present throughout the grains. 5. The ferrite particles according to claim 1 , wherein M includes Sr. 6. The ferrite particles according to claim 1 , wherein an apparent density of the particles is within a range of 2.17 to 2.32 g/cm 3 .
Assignees
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Classifications
Macromolecular components of coatings · CPC title
- C01G49/0072Primary
containing manganese · CPC title
obtained by SEM · CPC title
containing silicon atoms · CPC title
Micrometer sized, i.e. from 1-100 micrometer · CPC title
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- What does patent US9740129B2 cover?
- Ferrite particles have, as a main component, a material represented by a composition formula M x Fe 3−x O 4 (where M is at least one type of metal selected from a group made of Mg, Mn, Ca, Ti, Cu, Zn, Sr and Ni, 0<x<1), where the maximum height Rz of the particles falls within a range of 1.40 μm to 1.90 μm, and the degree of distortion Rsk of the particles falls within a range of −0.25 to −0.0…
- Who is the assignee on this patent?
- Dowa Electronics Materials Co Ltd, Dowa Ip Creation Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification C01G49/0072. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Aug 22 2017 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). 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).