发明公开
- 专利标题： Spindle-shaped goethite particles, spindle-shaped hematite particles, spindle-shaped magnetic metal particles containing iron as main component and processes for producing the same
- 专利标题（中）： 纺锤状针铁矿颗粒，纺锤状赤铁矿微粒和纺锤状磁性铁粒子和它们的制备方法
-
申请号： EP01305101.6申请日： 2001-06-12
-
公开(公告)号： EP1164581A3公开(公告)日： 2002-03-20
- 发明人: Okinaka, Kenji , Uegami, Masayuki
- 申请人： Toda Kogyo Corporation
- 申请人地址： 1-2, Funairiminami 4-chome, Naka-ku Hiroshima-shi, Hiroshima-ken JP
- 专利权人： Toda Kogyo Corporation
- 当前专利权人： Toda Kogyo Corporation
- 当前专利权人地址： 1-2, Funairiminami 4-chome, Naka-ku Hiroshima-shi, Hiroshima-ken JP
- 代理机构： Woods, Geoffrey Corlett
- 优先权： JP2000177377 20000613
- 主分类号： G11B5/706
- IPC分类号： G11B5/706 ; C01G49/06
摘要：
The present invention relates to spindle-shaped goethite particles which have an average major axial diameter of from 0.05 to 0.18 µm, an aspect ratio of more than 6:1 and less than 10:1 and a size distribution (standard deviation/average major axial diameter) of not more than 0.20; which contain not less than 0.5 and less than 6 atm% of Co based on the total amount of Fe, and more than 10 and less than 20 atm% of Al based on the total amount of Fe; and which have an atomic ratio of Al to Co of more than 2:1 and not more than 4:1. The particles of the invention may be used in a magnetic recording layer of a magnetic recording medium.
公开/授权文献
信息查询
IPC分类:
