Porous ferrite core material for electrophotographic developer, resin-coated ferrite carrier and electrophotographic developer using the ferrite carrier
US-9201329-B2 · Dec 1, 2015 · US
Carrier core particle for electrophotographic developer, method for manufacturing the same, carrier for electrophotographic developer and electrophotographic developer
US9329514B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9329514-B2 |
| Application number | US-201414496263-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 25, 2014 |
| Priority date | Mar 29, 2010 |
| Publication date | May 3, 2016 |
| Grant date | May 3, 2016 |
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- Title
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Abstract
Official abstract text for this publication.
A carrier core particle for an electrophotographic developer includes a composition expressed by a general formula: Mn x Fe 3−x O 4+y (0<x≦1, 0<y), a full width at half maximum z of the most intense peak ( 311 ) plane in a powder X-ray diffraction pattern satisfying 0.16 (degree)≦z, and a magnetization of 50 emu/g or higher in an external magnetic field of 1000 Oe.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method for manufacturing a carrier core particle for an electrophotographic developer, the carrier core particle containing manganese, iron and oxygen as core composition, the method comprising the steps of: granulating a mixture of a raw material containing manganese and a raw material containing iron; raising temperature of the powdery material granulated in the granulation step to a predetermined firing temperature; performing reaction sintering on the powdery material, after the temperature-rising step, by maintaining the powdery material at a predetermined sintering temperature for a predetermined period of time; and cooling the powdery material, after the reaction sintering step, under an atmosphere with an oxygen concentration from 0.6% to 3.0%. 2. The method for manufacturing the carrier core particle for the electrophotographic developer according to claim 1 , wherein the reaction sintering step is performed under the same atmosphere as in the cooling step. 3. The method for manufacturing the carrier core particle for the electrophotographic developer according to claim 1 , further comprising a step of: oxidizing the sintered powdery material after the reaction sintering step.
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Classifications
Magnetic properties · CPC title
- G03G9/1075Primary
Structural characteristics of the carrier particles, e.g. shape or crystallographic structure · CPC title
Electric properties · CPC title
having coatings applied thereto · CPC title
containing manganese · CPC title
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- What does patent US9329514B2 cover?
- A carrier core particle for an electrophotographic developer includes a composition expressed by a general formula: Mn x Fe 3−x O 4+y (0<x≦1, 0<y), a full width at half maximum z of the most intense peak ( 311 ) plane in a powder X-ray diffraction pattern satisfying 0.16 (degree)≦z, and a magnetization of 50 emu/g or higher in an external magnetic field of 1000 Oe.
- 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 G03G9/1075. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue May 03 2016 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).