| 发明名称 |
Cobalt-containing magnetic iron oxide and process for producing the same |
| 摘要 |
Cobalt-containing magnetic iron oxide particles extremely suitable for magnetic recording mediums, especially for image recording mediums and a process for producing the same from the precursor, gamma -FeOOH which is advantageous in industry are disclosed. Cobalt-containing magnetic iron oxide particles satisfying the following equations (1), (2) and (3):20</=SSA</=50(1)-16.70</=log [V]</=-3.05 log [SSA]-11.35(2)0.10</=Fe2+/total Fe</=0.30(3)where SSA is a BET specific surface area (m2/g), and V is a magnetic switching unit (cm3), can be produced by producing iron oxide particles having a concentration of Fe2+ of 0.10 to 0.36 as expressed by Fe2+/total Fe from the precursor, gamma -FeOOH, and coating a cobalt compound or a combination of a cobalt compound and other metal compounds on the surfaces of the iron oxide particles.
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| 申请公布号 |
US5609789(A) |
申请公布日期 |
1997.03.11 |
| 申请号 |
US19960635540 |
申请日期 |
1996.04.22 |
| 申请人 |
ISHIHARA SANGYO KAISHA, LTD. |
发明人 |
ASANO, KIYOSHI;KOYAMA, ARATA;TAKUMI, NOBUSUKE;TAKATORI, SHIGERU;TAMURA, KOUICHI;SUITA, TOKUO |
| 分类号 |
C01G49/06;G11B5/706;(IPC1-7):C04B35/26 |
主分类号 |
C01G49/06 |
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