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    • 6. 发明授权
    • Magnetic recording medium containing specific non-magnetic composite particles of coated hematite particles
    • 磁记录介质含有特定的非磁性复合颗粒的涂覆赤铁矿颗粒
    • US06511733B2
    • 2003-01-28
    • US09805374
    • 2001-03-14
    • Kazuyuki HayashiMamoru KamigakiHiroko Morii
    • Kazuyuki HayashiMamoru KamigakiHiroko Morii
    • B32B516
    • G11B5/735Y10T428/24421Y10T428/254Y10T428/257Y10T428/265Y10T428/2991Y10T428/2995Y10T428/2998
    • A magnetic recording medium comprises: a non-magnetic base film; a magnetic recording layer formed on one surface of the non-magnetic base film, comprising a binder resin and magnetic particles; and a back coat layer formed on a surface opposite of the non-magnetic base film to the surface on which the magnetic recording layer is formed, comprising a binder resin and plate-shaped non-magnetic composite particles having an average plate surface diameter of 0.1 to 5.0 &mgr;m, an average thickness of 0.001 to 0.1 &mgr;m and a plate ratio (average plate surface diameter/average thickness) of 5:1 to 100:1, wherein the plate-shaped non-magnetic composite particles comprise: plate-shaped hematite particles as core particles; a coating layer formed on surface of said plate-shaped hematite particle, comprising at least one organosilicon compound selected from the group consisting of: (1) organosilane compounds obtained from an alkoxysilane compounds, and (2) polysiloxanes or modified polysiloxanes; and a carbon black coat formed on said coating layer comprising at least one organosilicon compound, in an amount of from more than 1 to 30 parts by weight based on 100 parts by weight of said plate-shaped hematite particles.
    • 磁记录介质包括:非磁性基膜;在非磁性基膜的一个表面上形成的磁记录层,包括粘合剂树脂和磁性颗粒; 和在与非磁性基膜相对的表面上形成的背涂层与形成有磁记录层的表面形成,包括粘合剂树脂和板状非磁性复合材料颗粒,其平均板表面直径为0.1至 5.0μm,平均厚度为0.001〜0.1μm,板比(平均板面直径/平均厚度)为5:1〜100:1,其中板状非磁性复合颗粒包括:板状赤铁矿颗粒 作为核心颗粒; 所述板状赤铁矿颗粒的表面上形成的涂层包含至少一种选自以下的有机硅化合物:(1)由烷氧基硅烷化合物得到的有机硅烷化合物,和(2)聚硅氧烷或改性聚硅氧烷; 和基于100重量份的所述板状赤铁矿颗粒,在包含至少一种有机硅化合物的所述涂层上形成的炭黑涂层的量为大于1至30重量份。