| 发明名称 |
Acicular hematite particles and magnetic recording medium |
| 摘要 |
<p>Acicular hematite particles having an average major axis diameter of from 0.004 to 0.295 mu m, a geometrical standard deviation of the minor axis diameter of not more than 1.35 and a pH of not less than 8, which particles contain not more than 300 ppm of soluble sodium salt, calculated as Na and not more than 150 ppm of soluble sulfate, calculated as SO4.</p> |
| 申请公布号 |
EP0928775(B1) |
申请公布日期 |
2003.06.18 |
| 申请号 |
EP19980310711 |
申请日期 |
1998.12.24 |
| 申请人 |
TODA KOGYO CORPORATION |
发明人 |
HAYASHI, KAZUYUKI;TANAKA, YASUYUKI;IWASAKI, KEISUKE;MORII, HIROKO |
| 分类号 |
C01G49/06;C09C1/24;G11B5/733;G11B5/738;(IPC1-7):C01G49/06;G11B5/73 |
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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