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    • 104. 发明授权
    • Magnetic recording medium
    • 磁记录介质
    • US5292597A
    • 1994-03-08
    • US777147
    • 1991-10-16
    • Hitoshi NoguchiShinji SaitoHiroshi Ogawa
    • Hitoshi NoguchiShinji SaitoHiroshi Ogawa
    • G11B5/706C09D5/23C09D7/12G11B5/716B32B5/16G11B5/66
    • G11B5/716Y10S428/90Y10T428/257
    • A magnetic recording medium having excellent electromagnetic characteristics and well adapted for video use, which comprises a non-magnetic support having provided thereon at least two magnetic layers each comprising a ferromagnetic powder and a binder resin, wherein the uppermost magnetic layer arranged farthest from the support contains a cobalt-containing iron oxide powder having an Fe.sup.2+ /Fe.sup.3+ mole ratio of 20/100 to 50/100 and a coercive force of 650 to 1,500 Oe, and at least one of said magnetic layers is a lower magnetic layer in contact with the uppermost magnetic layer and contains a cobalt-containing iron oxide powder having an Fe.sup.2+ /Fe.sup.3+ mole ratio of less than 20/100 and a coercive force of 0.6 to 1.0 times that of the cobalt-containing iron oxide powder contained in the uppermost magnetic layer.
    • 一种具有优异的电磁特性并且非常适合于视频使用的磁记录介质,其包括非磁性载体,其上设置有至少两个磁性层,每个磁性层包含铁磁性粉末和粘合剂树脂,其中最上层的磁性层布置在与载体 含有Fe 2+ / Fe 3+摩尔比为20/100〜50/100,矫顽力为650〜1500Oe的钴的氧化铁粉末,并且所述磁性层中的至少一个是与 并且含有Fe 2+ / Fe 3+摩尔比小于20/100的钴的氧化铁粉末和矫顽力为包含在最上层磁性层中的含钴氧化铁粉末的矫顽力的0.6〜1.0倍。
    • 105. 发明授权
    • Magnetic recording medium
    • 磁记录介质
    • US5178935A
    • 1993-01-12
    • US419238
    • 1989-10-10
    • Shinji SaitoHiroshi OgawaNaoyoshi ChinoHiroo InabaKazuaki Taga
    • Shinji SaitoHiroshi OgawaNaoyoshi ChinoHiroo InabaKazuaki Taga
    • G11B5/716
    • G11B5/716Y10S428/90Y10T428/24942Y10T428/265Y10T428/31609
    • A magnetic recording comprising a non-magnetic support having thereon first and second magnetic layers containing a binder and a ferromagnetic powder. In a first embodiment, the content of the binder in each magnetic layer containing a vinyl chloride resin or a cellulose resin is characterized in relation to the quantity of the ferromagnetic powder contained therein. In a second embodiment, each of the magnetic layers is characterized in terms of a difference in glass transition point of a polyurethane resin contained therein. In a third embodiment, each of the magnetic layers is characterized in terms of thickness and polyisocyanate content, wherein the content of the polyisocyanate in the first magnetic layer is at least one part by weight larger than the amount of the polyisocyanate in the second magnetic layer.
    • 磁记录包括其上具有包含粘合剂和铁磁性粉末的第一和第二磁性层的非磁性载体。 在第一实施方案中,含有氯乙烯树脂或纤维素树脂的每个磁性层中的粘合剂的含量的特征在于其中所含的铁磁性粉末的量。 在第二实施方案中,每个磁性层的特征在于其中含有的聚氨酯树脂的玻璃化转变点的差异。 在第三实施方案中,每个磁性层的特征在于厚度和多异氰酸酯含量,其中第一磁性层中多异氰酸酯的含量比第二磁性层中的多异氰酸酯的量大至少一个重量份 。
    • 106. 发明授权
    • Magnetic recording medium for a video tape recorder and a method for
preparing the same
    • 用于视频带记录仪的磁记录介质及其制备方法
    • US5082729A
    • 1992-01-21
    • US259668
    • 1988-10-19
    • Tetsuji NishidaShinji SaitoNaoyoshi Chino
    • Tetsuji NishidaShinji SaitoNaoyoshi Chino
    • C09D5/23G11B5/714G11B5/716
    • G11B5/716G11B5/714Y10S428/90Y10T428/257Y10T428/265
    • A magnetic recording medium for a video tape recorder is disclosed, comprising a nonmagnetic support having thereon in the following order an under magnetic layer containing ferromagnetic particles of metal oxide and an upper magnetic layer containing ferromagnetic particles of metal oxide, wherein said under magnetic layer contains the ferromagnetic particles having a specific surface area by a BET method of from 26 to 50 m.sup.2 /g and a coercive force (Hc.sub.1) of from 500 to 1,000 Oe; said upper magnetic layer contains the ferromagnetic particles having a specific surface area by a BET method of from 30 to 60 m.sup.2 /g and a coercive force (Hc.sub.2) of from 600 to 1,200 Oe; the dry thickness of the upper magnetic layer is from 0.1 to 1.0 .mu.m; and the coercive force (Hc.sub.2) of the ferromagnetic particles for the upper magnetic layer is higher than the coercive force (Hc.sub.1) of the ferromagnetic particles for the under magnetic layer.
    • 公开了一种用于磁带录像机的磁记录介质,包括一非磁性载体,其上依次具有包含金属氧化物的铁磁颗粒的磁性层和含有金属氧化物的铁磁性颗粒的上磁层,其中所述下磁层包含 所述铁磁性粒子的BET比表面积为26〜50m 2 / g,矫顽力(Hc1)为500〜1000Oe; 所述上磁性层含有BET法为30〜60m 2 / g,矫顽力(Hc2)为600〜1200Oe的比表面积的铁磁性粒子, 上磁层的干厚度为0.1〜1.0μm; 并且用于上磁性层的铁磁颗粒的矫顽力(Hc2)高于用于下磁性层的铁磁颗粒的矫顽力(Hc1)。