| 发明名称 | Carrier core particle for electrophotographic developer, method for manufacturing the same, carrier for electrophotographic developer and electrophotographic developer | ||
| 摘要 | A carrier core particle for an electrophotographic developer includes a composition expressed by a general formula: MnxFe3−xO4+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. | ||
| 申请公布号 | US9329514(B2) | 申请公布日期 | 2016.05.03 |
| 申请号 | US201414496263 | 申请日期 | 2014.09.25 |
| 申请人 | DOWA ELECTRONICS MATERIALS CO., LTD.;DOWA IP CREATION CO., LTD. | 发明人 | Kawauchi Takeshi;Ogawa Sho |
| 分类号 | G03G9/10;G03G9/107;G03G9/113;C01G49/00 | 主分类号 | G03G9/10 |
| 代理机构 | Clark & Brody | 代理人 | Clark & Brody |
| 主权项 | 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%. | ||
| 地址 | Tokyo JP | ||