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    • 2. 发明授权
    • Magnetic recording medium
    • 磁记录介质
    • US4613545A
    • 1986-09-23
    • US598325
    • 1984-03-01
    • Ryoji ChubachiNobuyuki Nihei
    • Ryoji ChubachiNobuyuki Nihei
    • C09D5/23C09D127/04C09D127/06C09D167/00C09D175/00C09D175/04G11B5/702G11B5/706G11B5/70
    • G11B5/702Y10S428/90Y10T428/256Y10T428/257Y10T428/31609Y10T428/31786Y10T428/31935
    • A magnetic recording medium has on a nonmagnetic support, a magnetic layer consisting mainly of an acicular magnetic powder and a binder. The medium has excellent magnetic characteristics required for short-wave recording and has an excellent durability. For this purpose, the medium contains a ferromagnetic metal powder which has a coercive force of not less than 1,000 Oe and a specific surface area as determined by the BET method, of not less that 45 m.sup.2 /g. The medium contains in the binder not less than 50% by weight of a resin which has a high dispersibility owing to the introduction of at least one polar group selected from the group consisting of polar groups having the general formulas of: ##STR1## (wherein M is hydrogen, lithium, sodium or potassium; and M.sub.1 and M.sub.2 are hydrogen, lithium, sodium, potassium or alky groups).
    • PCT No.PCT / JP83 / 00211 Sec。 371日期1984年3月1日 102(e)日期1984年3月1日PCT提交1983年7月1日PCT公布。 公开号WO84 / 00241 日期1984年1月19日。磁记录介质在非磁性载体上,主要由针状磁性粉末和粘合剂组成的磁性层。 该介质具有优异的短波记录所需的磁特性,并且具有优异的耐久性。 为此目的,该介质含有不小于45m 2 / g的矫顽力不小于1000Oe的铁磁性金属粉末和通过BET法测定的比表面积。 介质中含有不少于50重量%的树脂,其由于引入至少一种极性基团而具有高分散性,所述极性基团选自具有以下通式的极性基团:其中 M是氢,锂,钠或钾; M1和M2是氢,锂,钠,钾或烷基)。