| 发明名称 |
Spherical magnetic particles for magnetic toner and process for producing the same |
| 摘要 |
<p>Spherical magnetic particles suitable for use in a magnetic toner, which particles comprise Fe<2+>-containing iron oxide particles which: (a) have an average particle diameter of from 0.05 to 0.30 mu m; (b) contain from 1.7 to 4 5 atm% of silicon, calculated as Si, based on Fe; (c) contain not more than 0.35 wt% of sulfur based on the total weight of said Fe<2+>-containing iron oxide particles; (d) have a sphericity ( phi ) represented by the following formula of from 0.8 to 1.0: <MATH> wherein l represents the average minor axial diameter of said Fe<2+>-containing particles and w represents the average major axial diameter of said Fe<2+>-containing particles; and (e) have a coercive force (Hc) at 10 kOe and the average particle diameter (d mu m) which satisfy the following relationship: <MATH></p> |
| 申请公布号 |
EP0750233(A1) |
申请公布日期 |
1996.12.27 |
| 申请号 |
EP19960304466 |
申请日期 |
1996.06.14 |
| 申请人 |
TODA KOGYO CORP. |
发明人 |
UCHIDA, NAOKI;FUJIOKA, KAZUO;AOKI, KOSO;MISAWA, HIROMITSU;KOZAWA, MINORU |
| 分类号 |
G03G9/083;(IPC1-7):G03G9/083;H01F1/11 |
主分类号 |
G03G9/083 |
| 代理机构 |
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