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    • 5. 发明授权
    • Magnetic recording medium
    • 磁记录介质
    • US5965248A
    • 1999-10-12
    • US996882
    • 1997-12-23
    • Akira SaitohYutaka TakahashiSatoru Tsuchida
    • Akira SaitohYutaka TakahashiSatoru Tsuchida
    • G11B5/706
    • G11B5/70621Y10S428/90Y10T428/256
    • A magnetic recording medium having excellent electromagnetic characteristics in the medium and high frequency regions has a magnetic layer formed on a non-magnetic support or a non-magnetic under layer, said magnetic layer comprising a magnetic metal powder containing iron (Fe) as a main component, 18 to 40% by weight of Co based on iron, Al and Y or a rare earth element, and having a specific surface area (x) by the BET method not exceeding 60 m.sup.2 /g, in which said magnetic metal powder has a saturation magnetization (.sigma.s) (y) and a specific surface area (x) by the BET method within the range bounded by the following four equations:y=0.05x.sup.2 -6x+330 (1)y=0.05x.sup.2 -6x+310 (2)y=x+126 (3)y=x+104 (4)
    • 在中高频区域具有优异电磁特性的磁记录介质具有形成在非磁性载体或非磁性底层上的磁性层,所述磁性层包括以铁(Fe)为主体的磁性金属粉末 18〜40重量%的基于铁,Al和Y的Co或稀土元素,并且通过BET法的比表面积(x)不超过60m 2 / g,其中所述磁性金属粉末具有 在由以下四个等式限定的范围内通过BET法得到的饱和磁化强度(sigma s)(y)和比表面积(x):y = 0.05x2-6x + 330(1)y = 0.05x2-6x + 310(2)y = x + 126(3)y = x + 104(4)
    • 10. 发明授权
    • Magnetic recording medium and a process for producing the same
    • 磁记录介质及其制造方法
    • US6127039A
    • 2000-10-03
    • US235382
    • 1999-01-22
    • Akira SaitohAkihiko SekiTakayoshi KuwajimaSatoru Tsuchida
    • Akira SaitohAkihiko SekiTakayoshi KuwajimaSatoru Tsuchida
    • G11B5/702G11B5/73G11B5/735G11B5/738G11B5/84G11B5/842
    • G11B5/735G11B5/8404Y10S428/90Y10T428/31609Y10T428/31935
    • A magnetic recording medium comprising a non-magnetic base having on at least one side a non-magnetic layer (undercoat) containing electron beam-curable resins which in turn is over-laid with a magnetic layer (topcoat) containing an iron (Fe) based magnetic powder, said magnetic layer having a glass transition temperature (Tg) of at least 65.degree. C. and said non-magnetic layer being an electron beam cured coating that is formed by coating the non-magnetic base with a non-magnetic coating mix containing electron beam curable resins, the yet to be cured coating having a glass transition temperature (Tg) of 30-53.degree. C. and said electron beam curable resins comprising an electron beam curable vinyl chloride based resin having a sulfur-containing polar group and an electron beam curable urethane resin having a phosphorus-containing polar group. Also disclosed is a process for producing the magnetic recording medium, which has good electromagnetic conversion characteristics in a high-frequency range and which can be manufactured at high production rate.
    • 一种磁记录介质,包括在至少一个侧面上具有含有电子束固化树脂的非磁性层(底涂层)的非磁性基底,该非磁性层又包含含有铁(Fe)的磁性层(面漆) 所述磁性层的玻璃化转变温度(Tg)至少为65℃,所述非磁性层是通过用非磁性涂层涂覆非磁性基底形成的电子束固化涂层 含有电子束固化树脂的混合物,尚待固化的涂层的玻璃化转变温度(Tg)为30-53℃,所述电子束固化树脂包含具有含硫极性基团的电子束固化氯乙烯基树脂 和具有含磷极性基团的电子束固化性聚氨酯树脂。 还公开了一种制造磁记录介质的方法,其在高频范围内具有良好的电磁转换特性,并且可以以高生产率制造。