发明名称 |
COBALT-CONTAINED MAGNETIC OXIDIZED IRON AND PREPARING METHOD THEREFOR |
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 </= Fe<2><+>/total Fe </= 0.30 (3> where SSA is a BET specific surface area (m<2>/g), and V is a magnetic switching unit (cm<3>), can be produced by producing iron oxide particles having a concentration of Fe<2><+> of 0.10 to 0.36 as expressed by Fe<2><+>/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. |
申请公布号 |
KR100249538(B1) |
申请公布日期 |
2000.03.15 |
申请号 |
KR19930030356 |
申请日期 |
1993.12.28 |
申请人 |
ISHIHARA SANGYO KAISHA LTD. |
发明人 |
ASHANO, KIYOSI;KOYAMA, ARATA;TAKUMI, NOBUSKE;TAKATORI, SIGERU;DAMURA, KOICHI;SYTA, TOKUO |
分类号 |
C01G49/06;G11B5/706;(IPC1-7):C01G49/00 |
主分类号 |
C01G49/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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