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    • 9. 发明授权
    • Magnetic recording medium and method for producing the same
    • 磁记录介质及其制造方法
    • US5554440A
    • 1996-09-10
    • US118326
    • 1993-09-09
    • Tatsuaki IshidaRyuji SugitaKiyokazu TohmaYasuaki Ban
    • Tatsuaki IshidaRyuji SugitaKiyokazu TohmaYasuaki Ban
    • G11B5/64G11B5/65G11B5/66G11B5/73G11B5/738G11B5/85H01F1/11G11B5/70
    • G11B5/656G11B5/66G11B5/85Y10S428/90Y10T428/265
    • A magnetic tape having a polymer substrate and a magnetic layer which is formed directly on a surface of the substrate or on a primer layer formed on the substrate and contains cobalt, oxygen and optionally nickel, in which a coercive force is at least 120 kA/m and a squareness ratio is at least 0.9 in a hysteresis loop which is obtained when a magnetic field is applied in a plane of the magnetic layer in a longitudinal direction of the magnetic tape, and on the hysteresis loop, an intensity of the applied magnetic field, at which a magnetization when the applied magnetic field is increased is 99% of the magnetization when the applied magnetic field is decreased, is not larger than 400 kA/m, and preferably, a ratio of a value of magnetization at an intersection between a tangential line drawn at a point which gives a residual magnetization at the applied magnetic field of 0 (zero) and a tangential line drawn at a point which gives a coercive force with a magnetization of 0 in a second quadrant to said residual magnetization is at least 0.9, which magnetic tape has improved high density recording/reproducing properties.
    • 一种具有聚合物基材和磁性层的磁带,其直接形成在基材的表面上或形成在基材上的底漆层上,并且含有钴,氧和任选的镍,矫顽力为至少120kA / m,当在磁带的纵向方向上的磁性层的平面中施加磁场时,在磁滞回线中,矩形比至少为0.9,在磁滞回线上,所施加的磁体的强度 当所施加的磁场增加时的磁化强度是施加的磁场减小时的磁化强度的99%,不大于400kA / m,优选地,在相交处的磁化强度的比值 在施加的磁场为0(零)的点处绘制的切线,以及在第二次给出磁化强度为0的矫顽力的点处画出的切线 所述残余磁化强度的象限至少为0.9,该磁带具有改善的高密度记录/再现特性。