发明公开
EP1074980A1 Magnetic recording medium, non-magnetic acicular black iron-based composite particles and process for producing the particles
审中-公开
一种磁记录介质，基于铁的非磁性黑色复合微粒，及其制造方法，颗粒
- 专利标题： Magnetic recording medium, non-magnetic acicular black iron-based composite particles and process for producing the particles
- 专利标题（中）： 一种磁记录介质，基于铁的非磁性黑色复合微粒，及其制造方法，颗粒
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申请号： EP00306559.6申请日： 2000-08-02
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公开(公告)号： EP1074980A1公开(公告)日： 2001-02-07
- 发明人: Hayashi, Kazayuki , Iwasaki, Keisuke , Tanaka, Yasuyuke , Morii, Hiroko
- 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： JP22018199 19990803; JP2000131866 20000428
- 主分类号： G11B5/738
- IPC分类号： G11B5/738 ; C09C1/00 ; C09C1/24 ; C09C3/12
摘要：
A magnetic recording medium of comprises:
(i) a non-magnetic base film;
(ii) a non-magnetic undercoat layer on said non-magnetic base film, comprising a binder resin and non-magnetic acicular black iron-based composite particles comprising:
acicular hematite particles or acicular iron oxide hydroxide particles having an average major axis diameter of 0.01 to 0.3 µm,
a coating layer on said acicular hematite particles or acicular iron oxide hydroxide 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 at least a part of said coating layer and which is present in an amount of 21 to 50 parts by weight per 100 parts by weight of said acicular hematite particles or acicular iron oxide hydroxide particles; and
(iii)a magnetic coating film on said non-magnetic undercoat layer, comprising a binder resin and magnetic particles.
(i) a non-magnetic base film;
(ii) a non-magnetic undercoat layer on said non-magnetic base film, comprising a binder resin and non-magnetic acicular black iron-based composite particles comprising:
acicular hematite particles or acicular iron oxide hydroxide particles having an average major axis diameter of 0.01 to 0.3 µm,
a coating layer on said acicular hematite particles or acicular iron oxide hydroxide 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 at least a part of said coating layer and which is present in an amount of 21 to 50 parts by weight per 100 parts by weight of said acicular hematite particles or acicular iron oxide hydroxide particles; and
(iii)a magnetic coating film on said non-magnetic undercoat layer, comprising a binder resin and magnetic particles.
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