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    Magnetic recording medium
    1.
    发明授权
    Magnetic recording medium 失效
    磁记录介质

    公开(公告)号：US3943012A

    公开(公告)日：1976-03-09

    申请号：US498337

    申请日：1974-08-19

    申请人： Yasuo Tamai ,  Masashi Aonuma ,  Matsuaki Nakamura ,  Hiroshi Agawa ,  Goro Akashi

    发明人： Yasuo Tamai ,  Masashi Aonuma ,  Matsuaki Nakamura ,  Hiroshi Agawa ,  Goro Akashi

    IPC分类号： C09D5/23 ,  C09D7/12 ,  G11B5/706 ,  H01F1/047 ,  H01F1/02

    CPC分类号： G11B5/70615 ,  G11B5/70621

    摘要： A magnetic recording medium for high density recording comprising a support having thereon a magnetic recording layer comprising a ferromagnetic metal powder of the Fe-Co-Cr-B system and having a coercive force of about 700 to 500 oersteds in the oriented direction of the magnetic substance and a residual magnetic flux density of about 1500 gausses or more, the residual magnetic flux density of which after storage for 160 hours under the conditions of a temperature of 60.degree.C and 90%RH is 85% or more of the initial value thereof before storage under these conditions in a binder. The magnetic recording medium is especially suitable for high density recording, having sufficient sensitivity and excellent resistance.

    摘要翻译： 一种用于高密度记录的磁记录介质，包括其上具有包含Fe-Co-Cr-B系统的铁磁金属粉末的磁记录层的支撑体，并且在磁性方向上具有约700至500奥斯特的矫顽力 物质和约1500高斯或更高的剩余磁通密度，其在60℃和90％RH的温度条件下储存160小时后的剩余磁通密度为其初始值的85％或更多 在这些条件下在粘合剂中储存之前。 磁记录介质特别适用于高密度记录，具有足够的灵敏度和优异的电阻。

    Magnetic recording medium
    2.
    发明授权
    Magnetic recording medium 失效
    磁记录介质

    公开(公告)号：US4009111A

    公开(公告)日：1977-02-22

    申请号：US624017

    申请日：1975-10-20

    申请人： Yasuo Tamai ,  Masashi Aonuma ,  Matsuaki Nakamura ,  Hiroshi Agawa ,  Goro Akashi

    发明人： Yasuo Tamai ,  Masashi Aonuma ,  Matsuaki Nakamura ,  Hiroshi Agawa ,  Goro Akashi

    IPC分类号： B22F9/24 ,  C22C33/02 ,  G11B5/706 ,  B22F3/00 ,  C22C1/04 ,  H01F1/02

    CPC分类号： G11B5/70621 ,  B22F9/24 ,  C22C33/0285 ,  G11B5/70615

    摘要： A magnetic recording medium for high density recording comprising a support having thereon a magnetic recording layer comprising a ferromagnetic metal powder of the Fe-Co-Cr-B system and having a coercive force of about 700 to 1500 orsteds in the oriented direction of the magnetic substance and a residual magnetic flux density of about 1500 gauses or more, the residual magnetic flux density of which after storage for 160 hours under the conditions of a temperature of 60.degree. C and 90%RH is 85% or more of the initial value thereof before storage under these conditions in a binder. The magnetic recording medium is especially suitable for high density recording, having sufficient sensitivity and excellent resistance.

    摘要翻译： 一种用于高密度记录的磁记录介质，包括其上具有磁记录层的载体，所述磁记录层包含Fe-Co-Cr-B系统的铁磁性金属粉末，并且在磁性方向上具有约700至1500埃的矫顽力 物质和剩余磁通密度约为1500高斯或以上，在60℃，90％RH的温度条件下保存160小时后的剩余磁通密度为初始值的85％以上 在这些条件下在粘合剂中储存之前。 磁记录介质特别适用于高密度记录，具有足够的灵敏度和优异的电阻。

    Ferromagnetic powder for magnetic recording medium and method for preparation thereof
    3.
    发明授权
    Ferromagnetic powder for magnetic recording medium and method for preparation thereof 失效
    磁记录介质用铁磁粉及其制备方法

    公开(公告)号：US3966510A

    公开(公告)日：1976-06-29

    申请号：US497794

    申请日：1974-08-15

    申请人： Masashi Aonuma ,  Yasuo Tamai ,  Goro Akashi

    发明人： Masashi Aonuma ,  Yasuo Tamai ,  Goro Akashi

    IPC分类号： G11B5/712 ,  C09D5/23 ,  C09D7/12 ,  H01F1/06 ,  H01F1/02

    CPC分类号： H01F1/061

    摘要： A ferromagnetic powder which contains at least Fe--B or Fe--Co--B with the surface of the powder having thereon a layer of Cr or a layer mainly consisting of Cr and a method of preparing the ferromagnetic powder comprising reducing a metal salt capable of forming a ferromagnetic powder containing at least Fe or Fe-Co in an aqueous solution thereof with one or more borohydride compounds or derivatives thereof and after the reduction is initiated adding an aqueous solution containing Cr ion or an anion containing Cr.

    摘要翻译： 一种至少含有Fe-B或Fe-Co-B的铁磁粉末，其中粉末的表面上有一层Cr或主要由Cr组成的层，以及制备铁磁性粉末的方法，包括还原金属盐 在一种或多种硼氢化合物或其衍生物的水溶液中形成至少含有Fe或Fe-Co的铁磁粉末，并且在还原开始后，加入含有Cr离子或含Cr的阴离子的水溶液。

    Magnetic recording medium
    4.
    发明授权
    Magnetic recording medium 失效
    磁记录介质

    公开(公告)号：US4847147A

    公开(公告)日：1989-07-11

    申请号：US129922

    申请日：1987-12-03

    申请人： Masashi Aonuma ,  Masaaki Suzuki ,  Yasuo Tamai

    发明人： Masashi Aonuma ,  Masaaki Suzuki ,  Yasuo Tamai

    IPC分类号： C09D5/23 ,  C09D7/12 ,  G11B5/716

    CPC分类号： G11B5/716 ,  Y10S428/90 ,  Y10T428/257 ,  Y10T428/265

    摘要： A magnetic recording medium is disclosed which comprises a non-magnetic support having coated thereon two magnetic layers, wherein an under layer of the magnetic layers contains ferromagnetic metal particles having a coercive force of 550 to 700 Oe, and wherein an upper layer of the magnetic layers contains a ferromagnetic particles having a specific surface area determined by the BET method of 25 to 35 m.sup.2 /g, a coercive force of 700 to 800 Oe and a thickness of 0.5 to 2.5 .mu.m, wherein the entire magnetic layer including the upper layer and the under layer have a coervice force of 580 to 750 Oe, a residual magnetic flux density of 2200 to 3200 gauss and a thickness of 3.0 to 5.0 .mu.m.

    摘要翻译： 公开了一种磁记录介质，其包括其上涂覆有两个磁性层的非磁性载体，其中磁性层的下层包含矫顽力为550-700Oe的强磁性金属颗粒，并且其中磁性层的上层 层包含通过BET法测定的比表面积为25〜35m 2 / g，矫顽力为700〜800Oe，厚度为0.5〜2.5μm的铁磁性粒子，其中，包含上层的整个磁性层 下层具有580〜750Oe的强度，剩余磁通密度为2200〜3200高斯，厚度为3.0〜5.0μm。

    Process for producing ferromagnetic metal powder
    5.
    发明授权
    Process for producing ferromagnetic metal powder 失效
    铁磁性金属粉末生产工艺

    公开(公告)号：US4101311A

    公开(公告)日：1978-07-18

    申请号：US820951

    申请日：1977-08-01

    申请人： Masashi Aonuma ,  Yasuo Tamai ,  Fumio Kodama

    发明人： Masashi Aonuma ,  Yasuo Tamai ,  Fumio Kodama

    IPC分类号： B22F9/24 ,  G11B5/706 ,  H01F1/06

    CPC分类号： H01F1/065 ,  B22F9/24 ,  G11B5/70615 ,  G11B5/70621 ,  Y10T428/31507 ,  Y10T428/31681

    摘要： A ferromagnetic metal powder having a narrow distribution of coercive force produced by reducing a salt of a metal capable of forming a ferromagnetic material as an aqueous solution thereof, where the reducing reaction is carried out while maintaining the temperature of the aqueous solution during and/or after the reduction reaction at about 20.degree. C higher than the temperature or less of the aqueous solution at the immediate beginning of the reduction reaction.

    摘要翻译： 一种铁磁性金属粉末，其具有通过将能形成铁磁材料的金属的盐作为其水溶液进行还原而产生的矫顽力分布，其中进行还原反应同时保持水溶液的温度和/或 在还原反应后，在还原反应开始后约20℃的还原反应高于水溶液的温度或更低。