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    • 1. 发明授权
    • Method for manufacturing magnetic paint, and magnetic recording medium
    • 磁性涂料的制造方法和磁记录介质
    • US07160481B2
    • 2007-01-09
    • US10765139
    • 2004-01-28
    • Katsuhiko YamazakiTsutomu IdeHiroyuki Tanaka
    • Katsuhiko YamazakiTsutomu IdeHiroyuki Tanaka
    • G11B5/842
    • G11B5/714G11B5/842H01F1/0027H01F1/44H01F41/16
    • A method for manufacturing magnetic paint is provided, wherein a dispersion condition is appropriately controlled to excellently disperse a magnetic powder composed of fine particles adaptable for a higher recording density, so that magnetic paint having excellent dispersibility can be prepared, and a magnetic recording medium having excellent surface roughness is provided. The magnetic paint is prepared by the step of subjecting a mixed solution containing at least a binder, a solvent, and a magnetic powder to a dispersion treatment with a dispersion device by the use of dispersion media through at least dispersion step, wherein the dispersion in the main dispersion step is carried out by the use of dispersion media having an average particle diameter y (mm) satisfying the relationship, which is represented by formula y≦0.01x, with the average maximum diameter x (nm) of the magnetic powder.
    • 提供一种制造磁性涂料的方法,其中适当地控制分散条件,以使由适合于较高记录密度的微粒组成的磁性粉末非常好地分散,从而可以制备具有优异分散性的磁性涂料,以及具有 提供优异的表面粗糙度。 该磁性涂料是通过至少分散步骤,通过使用分散介质使至少含有粘合剂,溶剂和磁性粉末的混合溶液用分散装置进行分散处理的步骤来制备的,其中分散体 主分散步骤通过使用平均粒径y(mm)的分散介质进行,该分散介质满足由公式y <= 0.01x表示的关系,其中磁粉的平均最大直径x(nm) 。
    • 3. 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>。