| 摘要 |
Iron oxide particles comprising: 100 parts by weight of material iron oxide particles having a specific surface area represented by the formula (1): <MATH> wherein rho represents the specific gravity, d3 represents the area-average particle diameter (0.1 mu m </= d3 </= 1.0 mu m) and PHI s represents the area shape factor (1.0 </= PHI s </= 2.0) of said material iron oxide particles; and 0.25 to 10 parts by weight (calculated as an oxide) of fine particles of an oxygen compound, of a hydrate or a mixture thereof of one element selected from Al, Si, Zr and Ti, which fine particles are adhered to the surface of said iron oxide particles; the increment of said specific surface area of said iron oxide particles being 1 to 6 m<2>/g, and the increment of said specific surface area with respect to the amount of aid fine particles being not less than 0.35. |
| 申请人 |
MISAWA, HIROMITSU;FUJIOKA, KAZUO;AOKI, KOSO;KURITA, EIICHI;OKANO, YOJI;KOZAWA, MINORU |
发明人 |
MISAWA, HIROMITSU;FUJIOKA, KAZUO;AOKI, KOSO;KURITA, EIICHI;OKANO, YOJI;KOZAWA, MINORU |
