Magnetic recording medium having a magnetic layer and a coating thereunder
    1.
    发明授权
    Magnetic recording medium having a magnetic layer and a coating thereunder 失效
    具有磁性层和其下的涂层的磁记录介质

    公开(公告)号:US06274227B1

    公开(公告)日:2001-08-14

    申请号:US09404756

    申请日:1999-09-24

    IPC分类号: G11B571

    摘要: A magnetic recording medium comprising a nonmagnetic substrate, a liquid lubricant-containing coating layer having a porosity (U) formed on the substrate, and a magnetic layer having a porosity (M) formed directly on the coating layer. The ratio of porosity (U/M) between the coating and magnetic layers is between 0.75 and 1.25. The volume percentage of the lubricant contained in the pores of the coating layer based on the whole pore volume in the coating layer is from 35 to 85%. This improves the durability of the magnetic layer.

    摘要翻译: 包括非磁性基底,在基底上形成有孔隙率(U)的含液体润滑剂的涂层的磁记录介质以及直接形成在涂层上的具有孔隙率(M)的磁性层。 涂层和磁性层之间的孔隙率(U / M)之比为0.75〜1.25。 基于涂层的全部孔体积,涂层的孔中含有的润滑剂的体积百分比为35〜85%。 这提高了磁性层的耐久性。

    High recording density magnetic recording medium having an undercoat
layer of iron oxide and carbon black
    3.
    发明授权
    High recording density magnetic recording medium having an undercoat layer of iron oxide and carbon black 失效
    具有氧化铁和炭黑底涂层的高记录密度磁记录介质

    公开(公告)号:US5612122A

    公开(公告)日:1997-03-18

    申请号:US501106

    申请日:1995-08-08

    IPC分类号: G11B5/738 G11B5/70

    摘要: A high recording density magnetic recording medium including a non-magnetic base film, a magnetic layer, and an undercoat layer provided therebetween. The undercoat layer includes non-magnetic particles, a binder resin, and a lubricant. The non-magnetic particles comprise (1) a non-magnetic iron oxide with an acicular ratio ranging from 5 to 10 and a long axis length ranging from 0.05 to 0.3 .mu.m, and (2) a carbon black having a structure constitution, and the weight ratio between said non-magnetic iron oxide and said carbon black is within the range between 85/15 and 99/1.

    摘要翻译: PCT No.PCT / US94 / 01331 Sec。 371日期:1995年8月8日 102(e)日期1995年8月8日PCT 1994年2月7日PCT PCT。 公开号WO94 / 18672 日期1994年8月18日一种包括非磁性基膜,磁性层和底涂层的高记录密度磁记录介质。 底涂层包括非磁性颗粒,粘合剂树脂和润滑剂。 非磁性粒子包括(1)针状比范围为5〜10,长轴长度为0.05〜0.3μm的非磁性氧化铁,(2)具有结构构成的炭黑,以及 所述非磁性氧化铁和所述炭黑的重量比在85/15至99/1之间。