| 发明名称 | Carrier core particles for electrophotographic developer, carrier for electrophotographic developer, and electrophotographic developer | ||
| 摘要 | A method for manufacturing carrier core particles for electrophotographic developer including a slurrying step (A) of making an iron-containing raw material and a strontium-containing raw material into slurry, a granulation step (B) of granulating the slurry mixture obtained in the slurrying step, and a firing step (C) of firing a powdery material, which is obtained by granulating the slurry mixture in the granulation step, at a predetermined temperature to form a magnetic phase. The slurrying step makes the iron-containing raw material into the slurry containing the iron-containing raw material having a volume diameter D50 of 1.0 to 4.0 μm and a volume diameter D90 of 2.5 to 7.0 μm, and makes the strontium-containing raw material into the slurry so that the carrier core particles for electrophotographic developer contain 0<y≦5000 ppm, where y denotes the content of the strontium in the carrier core particles. | ||
| 申请公布号 | US9195157(B2) | 申请公布日期 | 2015.11.24 |
| 申请号 | US201213819823 | 申请日期 | 2012.03.02 |
| 申请人 | DOWA ELECTRONICS MATERIALS CO., LTD.;DOWA IP CREATION CO., LTD. | 发明人 | Kawauchi Takeshi;Iida Tomohide |
| 分类号 | G03G9/10;G03G9/107;G03G9/113 | 主分类号 | G03G9/10 |
| 代理机构 | Clark & Brody | 代理人 | Clark & Brody |
| 主权项 | 1. Carrier core particles for electrophotographic developer, the carrier core particles having a core composition consisting of iron, manganese, and strontium, comprising: 0<y≦5000 ppm, where y denotes the content of the strontium in the carrier con particles; a mean particle diameter ranging from 20 μm to 30 μm; a BET specific surface area ranging from 0.15 m2/g to 0.25 m2/g; and a pore volume obtained by mercury porosimetry ranging from 0.003 ml/g to 0.023 ml/g. | ||
| 地址 | Tokyo JP | ||