发明名称 |
Hematitteilchen und magnetischer Aufzeichnungsträger welcher die Hematitteilchen als nicht-magnitische Teilchen in einer nicht-magnetischen Unterschicht verwendet |
摘要 |
Acicular hematite particles for use as non-magnetic particles for a non-magnetic undercoat layer of a magnetic recording medium contain 0.05 to 50 % by weight of aluminum, calculated as Al; have an average major axial diameter of not more than 0.3 mu m and a pH value of not less than 8; and 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. |
申请公布号 |
DE69800332(D1) |
申请公布日期 |
2000.11.09 |
申请号 |
DE1998600332 |
申请日期 |
1998.01.08 |
申请人 |
TODA KOGYO CORP., HIROSHIMA |
发明人 |
HAYASHI, KAZUYUKI;IWASAKI, KEISUKE;MORII, HIROKO;TANAKA, YASUYUKI |
分类号 |
C01G49/06;G11B5/738;(IPC1-7):C01G49/06;G11B5/733 |
主分类号 |
C01G49/06 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|