| 发明名称 |
Magnetic iron oxide particles and method of producing the same. |
| 摘要 |
Magnetic iron oxide particles, suitable for use in magnetic recording media, comprise: - spindle-shaped magnetite (FeOx.Fe2O3, 0 < x </= 1) particles having a major axis diameter of from 0.1 to 0.3 mu m, an axial ratio (major axis diameter: minor axis diameter) of notl ess than 7:1 and a print-through characteristic of not less than 45 dB; or - spindle-shaped maghemite particles having a major axis diameter of from 0.1 to 0.3 mu m, an axial ratio (major axis diameter: minor axis diameter) of not less than 7:1 and a print-through characteristic of not less than 53 dB. The particles may contain zinc and may have their surfaces modified by Co. |
| 申请公布号 |
EP0377933(B1) |
申请公布日期 |
1995.07.19 |
| 申请号 |
EP19890304015 |
申请日期 |
1989.04.21 |
| 申请人 |
TODA KOGYO CORP. |
发明人 |
TAKEDOI, ATSUSHI;TANIHARA, MAMORU;HARADA, TOSIHARU;ISOAI, MASARU;FUJITA, KAZUHIRO |
| 分类号 |
G11B5/706;(IPC1-7):G11B5/706;G11B5/714;H01F1/11 |
主分类号 |
G11B5/706 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
|
| 地址 |
|
