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    • 25. 发明授权
    • Magnetic recording medium and process for producing same
    • 磁记录介质及其制造方法
    • US5456977A
    • 1995-10-10
    • US53347
    • 1993-04-28
    • Kiyomi EjiriMasashi AonumaYoichi Hayata
    • Kiyomi EjiriMasashi AonumaYoichi Hayata
    • G11B5/708C09D5/23C09D7/12G11B5/70G11B5/71G11B5/716B32B5/16
    • G11B5/70G11B5/7085G11B5/716Y10T428/256Y10T428/257Y10T428/27
    • A magnetic recording medium is disclosed, comprising a nonmagnetic support having thereon a magnetic layer containing a ferromagnetic powder and a binder, wherein the magnetic layer contains at least one of .alpha.-Al.sub.2 O.sub.3 and Cr.sub.2 O.sub.3 in an amount of 5 to 15% by weight based on the weight of the ferromagnetic powder, the density of at least one of .alpha.-Al.sub.2 O.sub.3 and Cr.sub.2 O.sub.3 in the surface of the magnetic layer is less than 0.25/.mu.m.sup.2, the intensity ratio of Al spectrum to Fe spectrum as determined by ESCA is in the range of 0.05 to 0.20, or the intensity ratio of Cr spectrum to Fe spectrum as determined by ESCA is in the range of 0.02 to 0.08, and the magnetic layer contains a fatty acid or a fatty acid ester, and the fatty acid or fatty acid ester is orientated in the surface of the magnetic layer. And further a process for producing the above magnetic recording medium is disclosed.
    • 公开了一种磁记录介质,其包括其上具有含有铁磁性粉末和粘合剂的磁性层的非磁性载体,其中所述磁性层含有以重量计5至15%的量的α-Al 2 O 3和Cr 2 O 3中的至少一种 铁磁粉末的重量,磁性层表面中的α-Al2O3和Cr2O3中的至少一种的密度小于0.25 /μm2,通过ESCA测定的Al光谱与Fe光谱的强度比在 或者通过ESCA测定的Cr光谱与Fe光谱的强度比在0.02〜0.08的范围内,磁性层含有脂肪酸或脂肪酸酯,脂肪酸或脂肪酸 酯定向在磁性层的表面。 并且还公开了制造上述磁记录介质的方法。
    • 29. 发明授权
    • Magnetic recording medium
    • 磁记录介质
    • US4959263A
    • 1990-09-25
    • US195224
    • 1988-05-18
    • Masashi AonumaTsutomu OkitaHiroshi HashimotoHiroaki ArakiKiyotaka FukinoKiyomi Ejiri
    • Masashi AonumaTsutomu OkitaHiroshi HashimotoHiroaki ArakiKiyotaka FukinoKiyomi Ejiri
    • G11B5/702G11B5/712G11B5/714
    • G11B5/7026G11B5/712G11B5/714Y10S428/90Y10T428/257
    • A magnetic recording medium is described, comprising a nonmagnetic support having thereon a magnetic layer containing a binder which is cross-linkable or polymerizable by radiation irradiation and ferromagnetic particles, the ferromagnetic particles being metal or metal alloy particles mainly comprising iron having a crystal size of 300 .ANG. or less, having an atomic ratio of oxygen atoms to iron atoms of from 1.6 to 3.0 on the surface of the particles, and the magnetic layer having been irradiated with radiation, and comprising a nonmagnetic support having thereon a magnetic layer containing a binder comprising thermoplastic resins, thermosetting resins, reactive type resins and mixtures thereof and ferromagnetic particles, said ferromagnetic particles being metal or metal alloy particles mainly comprising iron having a crystal size of 250 .ANG. or less, and having an atomic ratio of oxygen atoms to iron atoms of from 1.6 to 3.0 on the surface of said particles.
    • 描述了一种磁记录介质,其包括其上具有含有可通过辐射照射和铁磁性颗粒可交联或可聚合的粘合剂的磁性层的非磁性载体,所述铁磁颗粒是主要包含具有晶体尺寸的铁的金属或金属合金颗粒 300或更小,在颗粒表面上的氧原子与铁原子的原子比为1.6至3.0,并且已经辐照辐照的磁性层,并且包含其上具有含有粘合剂的磁性层的非磁性载体 包括热塑性树脂,热固性树脂,反应型树脂及其混合物和铁磁颗粒,所述铁磁性颗粒是主要包含结晶尺寸为250或更小的铁并且具有氧原子与铁原子的原子比的金属或金属合金颗粒 在所述颗粒的表面上为1.6至3.0。