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    Acicular hematite particles and magnetic recording medium
    1.
    发明授权
    Acicular hematite particles and magnetic recording medium 失效
    针状赤铁矿颗粒和磁记录介质

    公开(公告)号：US6153296A

    公开(公告)日：2000-11-28

    申请号：US266018

    申请日：1999-03-11

    申请人： Kazuyuki Hayashi ,  Keisuke Iwasaki ,  Tosiharu Harada ,  Hiroko Morii

    发明人： Kazuyuki Hayashi ,  Keisuke Iwasaki ,  Tosiharu Harada ,  Hiroko Morii

    IPC分类号： C01G49/00 ,  C01G49/06 ,  G11B5/733

    CPC分类号： C01G49/06 ,  B82Y30/00 ,  C01G49/0018 ,  G11B5/738 ,  C01P2002/54 ,  C01P2004/10 ,  C01P2004/54 ,  C01P2004/62 ,  C01P2004/64 ,  C01P2006/12 ,  C01P2006/22 ,  C01P2006/42 ,  Y10S428/90 ,  Y10T428/256 ,  Y10T428/257 ,  Y10T428/2982 ,  Y10T428/2991

    摘要： Acicular hematite particles of the present invention contain zirconium of 0.05 to 30% by weight (calculated as Zr) based on the total weight of the particles, which is present within the particle, which have an average major axis diameter of not more than 0.3 .mu.m and a pH value of not less than 8, and contain not more than 300 ppm of soluble sodium salt, calculated as Na and not more than 150 ppm of soluble sulfate, calculated as SO.sub.4.Such acicular hematite particles are suitable as non-magnetic particles for a non-magnetic undercoat layer of a magnetic recording medium which exhibits a low light transmittance, an excellent smooth surface, a high strength and an excellent durability, and can be prevented from being deteriorated in magnetic properties due to the corrosion of magnetic acicular metal particles containing iron as a main component which are dispersed in a magnetic recording layer thereof.

    摘要翻译： 本发明的针状赤铁矿颗粒含有基于颗粒内存在的平均长径不大于0.3μm的颗粒总重量为0.05〜30重量％（以Zr计算）的锆 m，pH值不小于8，并且含有不大于300ppm的可溶性钠盐，以Na计，不超过150ppm的可溶性硫酸盐，以SO 4计算。 这种针状赤铁矿颗粒适用于磁记录介质的非磁性底涂层的非磁性颗粒，其表现出低的透光率，优异的光滑表面，高强度和优异的耐久性，并且可以防止劣化 由于以分散在其磁记录层中的以铁为主要成分的磁性针状金属颗粒的腐蚀而导致的磁特性。

    Black magnetic acicular composite particles for magnetic recording medium and magnetic recording medium using the same
    2.
    发明授权
    Black magnetic acicular composite particles for magnetic recording medium and magnetic recording medium using the same 失效
    用于磁记录介质的黑色磁性针状复合颗粒和使用其的磁记录介质

    公开(公告)号：US06863966B1

    公开(公告)日：2005-03-08

    申请号：US09710834

    申请日：2000-11-14

    申请人： Kazuyuki Hayashi ,  Hiroko Morii ,  Mamoru Kamigaki ,  Yasuyuki Tanaka ,  Keisuke Iwasaki

    发明人： Kazuyuki Hayashi ,  Hiroko Morii ,  Mamoru Kamigaki ,  Yasuyuki Tanaka ,  Keisuke Iwasaki

    IPC分类号： G11B5/712 ,  G11B5/66 ,  B32B3/00 ,  B32B3/02 ,  B32B5/16 ,  B32B9/00

    CPC分类号： G11B5/712 ,  Y10S428/90 ,  Y10S428/926 ,  Y10T428/257 ,  Y10T428/26 ,  Y10T428/2995

    摘要： A magnetic recording medium comprises: a non-magnetic base film; and a magnetic recording layer comprising a binder resin and black magnetic acicular composite particles having an average particle diameter of 0.051 to 0.35 μm, comprising magnetic acicular cobalt-coated iron oxide particles or magnetic acicular metal particles containing iron as a main component, a coating formed on surface of the magnetic acicular particles, comprising at least one organosilicon compound selected from the group consisting of: (1) organosilane compounds obtainable from alkoxysilane compounds, and (2) polysiloxanes or modified polysiloxanes, and a carbon black coat formed on the coating layer comprising said organosilicon compound, in an amount of from more than 10 to 40 parts by weight based on 100 parts by weight of said magnetic acicular particles. Such a magnetic recording medium exhibits not only a smooth surface, a smaller light transmittance and a lower surface electrical resistivity value, but also a small friction coefficient and an excellent running durability.

    摘要翻译： 磁记录介质包括：非磁性基膜; 以及包含粘结剂树脂和平均粒径为0.051-0.35μm的黑色磁性针状复合颗粒的磁性记录层，包括磁性针状钴包覆氧化铁颗粒或以铁为主要成分的磁性针状金属颗粒，在表面上形成的涂层 包含至少一种选自以下的有机硅化合物：（1）由烷氧基硅烷化合物得到的有机硅烷化合物和（2）聚硅氧烷或改性聚硅氧烷，以及在包含所述有机硅的涂层上形成的炭黑涂层 化合物，相对于100重量份的所述磁针状颗粒，其含量为10-40重量份以上。这样的磁记录介质不仅表现出光滑的表面，较小的透光率和较低的表面电阻率值 ，而且摩擦系数小，运行耐久性好。

    Magnetic recording medium and magnetic composite particles or magnetic recording medium
    3.
    发明授权
    Magnetic recording medium and magnetic composite particles or magnetic recording medium 失效
    磁记录介质和磁性复合颗粒或磁记录介质

    公开(公告)号：US06569530B2

    公开(公告)日：2003-05-27

    申请号：US10061357

    申请日：2002-02-04

    申请人： Kazuyuki Hayashi ,  Keisuke Iwasaki ,  Mamoru Kamigaki ,  Hiroko Morii

    发明人： Kazuyuki Hayashi ,  Keisuke Iwasaki ,  Mamoru Kamigaki ,  Hiroko Morii

    IPC分类号： G11B5706

    CPC分类号： G11B5/712 ,  Y10T428/256 ,  Y10T428/257 ,  Y10T428/2991 ,  Y10T428/2993 ,  Y10T428/2995 ,  Y10T428/2998

    摘要： A magnetic recording medium comprises: a non-magnetic base film; and a magnetic recording layer comprising a binder resin and magnetic composite particles having an average particle diameter of 0.02 to 0.70 &mgr;m, comprising magnetic particles as core particles, a coating formed on surface of said magnetic particle, comprising at least one organosilicon compound selected from the group consisting of: (1) organosilane compounds obtainable from alkoxysilane compounds, and (2) polysiloxanes or modified polysiloxanes, and a phthalocyanine-based pigments coat formed on said coating layer comprising said organosilicon compound, in an amount of 1 to 100 parts by weight based on 100 parts by weight of said magnetic particles.

    摘要翻译： 磁记录介质包括：非磁性基膜; 以及包含粘合剂树脂的磁记录层和平均粒径为0.02-0.70μm的磁性复合颗粒，其包含作为核心颗粒的磁性颗粒，在所述磁性颗粒的表面上形成的涂层，包含至少一种选自以下的有机硅化合物： ：（1）由烷氧基硅烷化合物得到的有机硅烷化合物和（2）聚硅氧烷或改性聚硅氧烷，以及包含所述有机硅化合物的所述涂层上形成的酞菁类颜料涂层，其量为100至100重量份，基于100 所述磁性颗粒重量份。

    Non-magnetic undercoating layer for magnetic recording medium, magnetic recording medium and non-magnetic particles
    7.
    发明授权
    Non-magnetic undercoating layer for magnetic recording medium, magnetic recording medium and non-magnetic particles 失效
    用于磁记录介质的非磁性底涂层，磁记录介质和非磁性颗粒

    公开(公告)号：US5830557A

    公开(公告)日：1998-11-03

    申请号：US392199

    申请日：1995-02-22

    申请人： Kazuyuki Hayashi ,  Keisuke Iwasaki ,  Yasuyuki Tanaka ,  Minoru Ohsugi ,  Hiroko Morii ,  Mineko Sakoda ,  Norio Sugita ,  Masaaki Maekawa

    发明人： Kazuyuki Hayashi ,  Keisuke Iwasaki ,  Yasuyuki Tanaka ,  Minoru Ohsugi ,  Hiroko Morii ,  Mineko Sakoda ,  Norio Sugita ,  Masaaki Maekawa

    IPC分类号： G11B5/733 ,  G11B5/738 ,  G11B5/66 ,  G11B5/70

    CPC分类号： G11B5/738 ,  G11B5/733 ,  Y10S428/90 ,  Y10T428/24372 ,  Y10T428/2438 ,  Y10T428/24388 ,  Y10T428/265 ,  Y10T428/2991 ,  Y10T428/2993 ,  Y10T428/2995

    摘要： The disclosure describes a non-magnetic undercoating layer for a magnetic recording medium, coated on the surface of a non-magnetic substrate comprising: non-magnetic particles selected from the group consisting of particles (1) and (2): (1) coated acicular or spindle-shaped .alpha.-Fe.sub.2 O.sub.3 particles which are produced by adhering not less than 0.01 to 20 wt % (calculated as Al, SiO.sub.2 or Al and SiO.sub.2, and based on acicular or spindle-shaped .alpha.-Fe.sub.2 O.sub.3 particles as a core material) of an oxide or a hydroxide containing Al, Si or both Al and Si to the surfaces of acicular or spindle-shaped .alpha.-Fe.sub.2 O.sub.3 particles as a core material, and have a molecular weight-dependent parameter .alpha. represented by the following formula of not less than 0.5: As=K.sub.1 .multidot.M.sup..alpha. wherein M represents the number-average molecular weight of a binder resin, As represents the saturation adsorption of said binder resin, and K.sub.1 represents a constant used for measuring As and dependent on the binder resin and a solvent, (2) BaO.multidot.4.5Fe.sub.2 O.sub.3 particles having an average particle diameter of not more than 0.1 .mu.m; and a binder resin.

    摘要翻译： 本发明描述了一种涂覆在非磁性基材表面上的用于磁记录介质的非磁性底涂层，包括：选自颗粒（1）和（2）的非磁性颗粒：（1）涂覆 通过粘附不小于0.01至20重量％（以Al，SiO 2或Al和SiO 2计算，并以针状或纺锤形α-Fe2O3颗粒为核心材料）制备的针状或纺锤状α-Fe2O3颗粒， 含有Al，Si或Al和Si的氧化物或氢氧化物作为核心材料的针状或纺锤形α-Fe2O3颗粒的表面，并且具有不低于下列公式的分子量依赖参数α 比0.5：As =K1xMα其中M表示粘合剂树脂的数均分子量，As表示所述粘合剂树脂的饱和吸附，K1表示用于测量As的常数，并且取决于粘合剂树脂和溶剂， （ 2）平均粒径不大于0.1μm的BaO x 4.5 Fe 2 O 3粒子; 和粘合剂树脂。