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    • 6. 发明申请
    • MAGNETIC RECORDING MEDIUM AND PROCESS FOR PRODUCING THE SAME
    • 磁记录介质及其制造方法
    • US20080241600A1
    • 2008-10-02
    • US12056568
    • 2008-03-27
    • Hiroyuki TanakaTsutomu IdeOsamu Inoue
    • Hiroyuki TanakaTsutomu IdeOsamu Inoue
    • G11B5/66B05D5/12
    • G11B5/73G11B5/7026
    • The present invention provides a magnetic recording medium wherein a fine non-magnetic inorganic powder, the dispersibility of which is improved, is used to improve the surface smoothness of a lower non-magnetic layer, thereby giving an excellent surface smoothness of an upper magnetic layer and electromagnetic conversion property; and a production process thereof. A magnetic recording medium comprising at least a non-magnetic support, a lower non-magnetic layer on one surface of the non-magnetic support, and an upper magnetic layer on the lower non-magnetic layer, wherein the upper magnetic layer contains at least a ferromagnetic powder, and a binder resin material, and the lower non-magnetic layer contains at least carbon black, iron oxide, and a binder resin material, and the iron oxide has an average major axis length of 30 to 100 nm, and a specific surface area based on the BET method of 80 to 120 m2/g, and the iron oxide contains moisture in an amount per unit specific surface area of 0.13 to 0.25 mg/m2.
    • 本发明提供了一种磁记录介质,其中改善了其分散性的细非磁性无机粉末用于改善下部非磁性层的表面平滑度,从而赋予上层磁性层优异的表面平滑度 和电磁转换特性; 及其制造方法。 至少包括非磁性载体,非磁性载体的一个表面上的下部非磁性层和下部非磁性层上的上磁性层的磁记录介质,其中上部磁性层至少含有 铁磁粉末和粘结剂树脂材料,下部非磁性层至少含有炭黑,氧化铁和粘合剂树脂材料,氧化铁的平均长轴长度为30〜100nm, 基于BET法的比表面积为80〜120m 2 / g,氧化铁含有每单位比表面积为0.13〜0.25mg / m 2的水分, / SUP>。