发明名称 |
Acicular ferromagnetic iron oxide particles and process for producing the same |
摘要 |
There are provided acicular berthollide particles comprising crystalline particles expressed by the formula FeOx (1.33</=x<1.5) and modified with a specific amount of zinc ions and a process producing the same which comprises the steps of oxidizing acicular magnetic iron oxide particles expressed by the formula FeOx (1.0<x<1.33) and modified with a specific amount of zinc ions which are produced by (a) heating and dehydrating acicular hydrous iron oxide particles containing a specific amount of a zinc component, reducing, and heating the particles under specific conditions, or (b) reducing acicular iron oxide particles containing a specific amount of a zinc component and heating the particles under specific conditions, or (c) heating acicular magnetic iron oxide particles expressed by the formula FeOx (1.0<x<1.33) containing a specific amount of zinc ions under specific conditions.
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申请公布号 |
US5512194(A) |
申请公布日期 |
1996.04.30 |
申请号 |
US19940255956 |
申请日期 |
1994.06.07 |
申请人 |
ISHIHARA SANGYO KAISHA, LTD. |
发明人 |
OGASAWARA, MAKOTO;YADA, MASAKAZU;SAKURAI, KAORU;HAGA, KAZUYA;MIYASHITA, MASAHIDE;HIRAI, YASUMASA |
分类号 |
G11B5/706;(IPC1-7):C01G49/02 |
主分类号 |
G11B5/706 |
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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