发明公开
EP1102246A1 Black magnetic acicular composite particles for magnetic recording medium and magnetic recording medium using the same
审中-公开
Schwarzenadelförmigemagnetische Kompositteilchen und diese enthaltendes magnetisches Aufzeichnungsmedium
- 专利标题： Black magnetic acicular composite particles for magnetic recording medium and magnetic recording medium using the same
- 专利标题（中）： Schwarzenadelförmigemagnetische Kompositteilchen und diese enthaltendes magnetisches Aufzeichnungsmedium
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申请号： EP00310101.1申请日： 2000-11-14
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公开(公告)号： EP1102246A1公开(公告)日： 2001-05-23
- 发明人: Hayashi, Kazuyuki , Morii, Hiroko , Kamigaki, Mamoru , Tanaka, Yasuyuki , Iwasaki, Keisuke
- 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： JP32415099 19991115; JP32619199 19991116
- 主分类号： G11B5/712
- IPC分类号： G11B5/712
摘要：
A magnetic recording medium comprises a non-magnetic base film; and a magnetic recording layer comprising a binder resin and black magnetic acicular composite particles having an average particle diameter of 0.051 to 0.35 µm and comprising:
magnetic acicular cobalt-coated iron oxide particles or magnetic acicular metal particles containing iron as a main component,
a coating on the surface of the magnetic acicular particles, comprising at least one organosilicon compound selected from:
(1) organosilane compounds obtainable from alkoxysilane compounds, and
(2) polysiloxanes or modified polysiloxanes, and
a carbon black coat which is provided on the said coating in an amount of from more than 10 to 40 parts by weight per 100 parts by weight of said magnetic acicular particles.
magnetic acicular cobalt-coated iron oxide particles or magnetic acicular metal particles containing iron as a main component,
a coating on the surface of the magnetic acicular particles, comprising at least one organosilicon compound selected from:
(1) organosilane compounds obtainable from alkoxysilane compounds, and
(2) polysiloxanes or modified polysiloxanes, and
a carbon black coat which is provided on the said coating in an amount of from more than 10 to 40 parts by weight per 100 parts by weight of said magnetic acicular particles.
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