| 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. |
| 申请人 |
TODA KOGYO CORP., HIROSHIMA, JP |
发明人 |
TAKEDOI, ATSUSHI, HIROSHIMA-SHI HIROSHIMA-KEN, JP;TANIHARA, MAMORU, HIROSHIMA-SHI HIROSHIMA-KEN, JP;HARADA, TOSIHARU, HIROSHIMA-SHI HIROSHIMA-KEN, JP;ISOAI, MASARU, HIROSHIMA-SHI HIROSHIMA-KEN, JP;FUJITA, KAZUHIRO, HIROSHIMA-SHI HIROSHIMA-KEN, JP |
