发明公开
EP1191518A1 Magnetic recording medium, non-magnetic acicular composite particels and process for producing the particles
审中-公开
一种磁记录介质，非磁性针状它们的制备复合颗粒和过程
- 专利标题： Magnetic recording medium, non-magnetic acicular composite particels and process for producing the particles
- 专利标题（中）： 一种磁记录介质，非磁性针状它们的制备复合颗粒和过程
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申请号： EP01308146.8申请日： 2001-09-25
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公开(公告)号： EP1191518A1公开(公告)日： 2002-03-27
- 发明人: Hayashi, Kazuyuki , Iwasaki, Keisuke , 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： JP2000293172 20000926; JP2001167381 20010601
- 主分类号： G11B5/73
- IPC分类号： G11B5/73
摘要：
A magnetic recording medium comprises:
(i) a non-magnetic base film;
(ii) a non-magnetic undercoat layer on the non-magnetic base film, comprising a binder resin and non-magnetic acicular composite particles having an average major axis diameter of 0.01 to 0.3 µm and comprising:
acicular hematite particles or acicular iron oxide hydroxide particles as non-magnetic core particles,
a coating 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 phthalocyanine-based pigment coat which is provided on said coating layer and which is present in an amount of from 1 to 100 parts by weight based on 100 parts by weight of said acicular hematite particles or acicular iron oxide hydroxide particles; and
(iii) a magnetic recording layer on the non-magnetic undercoat layer, comprising magnetic particles and a binder resin.
(i) a non-magnetic base film;
(ii) a non-magnetic undercoat layer on the non-magnetic base film, comprising a binder resin and non-magnetic acicular composite particles having an average major axis diameter of 0.01 to 0.3 µm and comprising:
acicular hematite particles or acicular iron oxide hydroxide particles as non-magnetic core particles,
a coating 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 phthalocyanine-based pigment coat which is provided on said coating layer and which is present in an amount of from 1 to 100 parts by weight based on 100 parts by weight of said acicular hematite particles or acicular iron oxide hydroxide particles; and
(iii) a magnetic recording layer on the non-magnetic undercoat layer, comprising magnetic particles and a binder resin.
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