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    Magnetic recording medium
    91.
    发明授权
    Magnetic recording medium 失效
    磁记录介质

    公开(公告)号：US4756962A

    公开(公告)日：1988-07-12

    申请号：US41177

    申请日：1987-04-22

    Applicant: Shigeru Takamatsu ,  Hideo Dobashi ,  Hitoshi Azegami

    Inventor： Shigeru Takamatsu ,  Hideo Dobashi ,  Hitoshi Azegami

    IPC: C09D5/23 ,  C09D7/12 ,  G11B5/708

    CPC classification number: G11B5/708 ,  Y10S428/90 ,  Y10T428/256 ,  Y10T428/257

    Abstract: A magnetic recording medium, comprising a plastic base coated with a magnetic layer of a ferromagnetic powder dispersed in a resin binder, contains in the magnetic layer .alpha.-Al.sub.2 O.sub.3 particles with an average particle size of 0.1 to 0.3 .mu.m as determined by electron microscopy in an amount of more than 0.5% but less than 15% by weight on the basis of the ferromagnetic powder weight. The .alpha.-Al.sub.2 O.sub.3 particles have an .alpha.-transformation rate of at least 50%. The powder is produced by an organic alumina process.

    Abstract translation: 包含涂布有分散在树脂粘合剂中的铁磁性粉末的磁性层的塑料基体的磁记录介质在通过电子显微镜测定的平均粒径为0.1至0.3μm的磁性层中含有α-Al 2 O 3颗粒， 其量以铁磁粉末重量为基准，大于0.5重量％但小于15重量％。 α-Al2O3颗粒的α-转化率至少为50％。 该粉末由有机氧化铝工艺生产。

    Magnetic recording medium
    93.
    发明授权
    Magnetic recording medium 失效
    磁记录介质

    公开(公告)号：US4731278A

    公开(公告)日：1988-03-15

    申请号：US862724

    申请日：1986-05-13

    Applicant: Katsumi Ryoke ,  Masatoshi Takahashi ,  Eiichi Tadokoro

    Inventor： Katsumi Ryoke ,  Masatoshi Takahashi ,  Eiichi Tadokoro

    IPC: C01G49/00 ,  C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  C09D175/00 ,  C09D175/04 ,  G11B5/70 ,  G11B5/702 ,  G11B5/706 ,  G11B5/708 ,  G11B5/714 ,  G11B5/73 ,  G11B5/735 ,  H01F1/11

    CPC classification number: G11B5/7085 ,  G11B5/7023 ,  G11B5/714 ,  Y10S428/90 ,  Y10T428/24355 ,  Y10T428/25 ,  Y10T428/257

    Abstract: A magnetic recording medium is described, comprising a magnetic layer containing ferromagnetic fine particles and a binder coated on one side of a non-magnetic support and a backing layer coated on the opposite side of the non-magnetic support, wherein said ferromagnetic fine particles have a cobalt content of from 2 to 10 wt % with respect to the iron oxide content thereof, the content of divalent iron (Fe.sup.2+) of from 1 to 10 wt % with respect to the trivalent iron (Fe.sup.3+) content thereof, and the specific surface area of from 30 to 50 m.sup.2 /g, said binder comprises a copolymer of vinyl chloride-vinyl acetate-maleic acid contained in an amount of 40 wt % or more with respect to the total binder content of the magnetic layer, an abrasive agent having a Mohs hardness of 6 or more is contained in said magnetic layer, and the resulting magnetic tape has a coercive force of from 750 to 900 Oe at 25.degree. C.

    Abstract translation: 描述了一种磁记录介质，其包括含有铁磁细颗粒的磁性层和涂覆在非磁性载体的一侧上的粘合剂和涂覆在非磁性载体的相对侧上的背衬层，其中所述铁磁细颗粒具有 相对于其氧化铁含量为2〜10重量％的钴含量，相对于三价铁（Fe3 +）含量，二价铁（Fe 2+）的含量为1〜10重量％，比表面积 面积为30〜50m2 / g，所述粘合剂包含相对于磁性层的总粘合剂含量为40重量％以上的氯乙烯 - 乙酸乙烯酯 - 马来酸的共聚物，具有 所述磁性层中含有6以上的莫氏硬度，所得磁带在25℃下的矫顽力为750〜900Oe。

    Magnetic recording medium
    94.
    发明授权
    Magnetic recording medium 失效
    磁记录介质

    公开(公告)号：US4689265A

    公开(公告)日：1987-08-25

    申请号：US792896

    申请日：1985-10-30

    Applicant: Takahito Miyoshi ,  Masaaki Fujiyama

    Inventor： Takahito Miyoshi ,  Masaaki Fujiyama

    IPC: C09D5/23 ,  C09D7/12 ,  G11B5/708 ,  G11B5/714

    CPC classification number: G11B5/708 ,  G11B5/714 ,  Y10S428/90 ,  Y10T428/25 ,  Y10T428/256 ,  Y10T428/257

    Abstract: A magnetic recording medium comprising a nonmagnetic support and a magnetic recording layer provided on said support, said magnetic recording layer comprising a ferromagnetic powder dispersed in a binder, characterized in that said magnetic recording layer contains an inorganic plate powder having the maximum diameter of not larger than 1.0 .mu.m and a thickness of not larger than 0.1 .mu.m.

    Abstract translation: 一种包含非磁性载体和设置在所述载体上的磁记录层的磁记录介质，所述磁记录层包含分散在粘合剂中的铁磁性粉末，其特征在于，所述磁记录层含有最大直径不大的无机板粉末 大于1.0μm，厚度不大于0.1μm。

    Magnetic recording medium
    95.
    发明授权
    Magnetic recording medium 失效
    磁记录介质

    公开(公告)号：US4686139A

    公开(公告)日：1987-08-11

    申请号：US778468

    申请日：1985-09-20

    Applicant: Katsumi Ryoke ,  Nobutaka Yamaguchi ,  Masatoshi Takahashi ,  Kazuko Hanai ,  Hideaki Kosha ,  Eiichi Tadokoro

    Inventor： Katsumi Ryoke ,  Nobutaka Yamaguchi ,  Masatoshi Takahashi ,  Kazuko Hanai ,  Hideaki Kosha ,  Eiichi Tadokoro

    IPC: C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  C09D163/00 ,  G11B5/73 ,  G11B5/735 ,  G11B5/68 ,  G11B5/708

    CPC classification number: G11B5/735 ,  Y10S428/90 ,  Y10T428/25 ,  Y10T428/265 ,  Y10T428/30

    Abstract: A magnetic recording medium is described, comprising a non-magnetic support having a magnetic layer and a backing layer which is provided on the surface of the support opposite to the magnetic layer, the backing layer containing (a) non-magnetic particles comprising carbon black having an average particle diameter of 0.1 to 1.0 .mu.m, (b) a binder comprising (i) a resin having 150 kg/cm.sup.2 or less of 100% modulus in an amount of at least 50 wt % based on the total amount of binder, and (ii) a diphenyl methane diisocyanate type hardening agent, with the amount of non-magnetic particles to total contained in the backing layer being 40 to 300 parts by weight of non-magnetic particles per 100 parts by weight of binder.

    Abstract translation: 描述了一种磁记录介质，其包括具有磁性层的非磁性载体和设置在与磁性层相对的支撑体的表面上的背衬层，背衬层包含（a）包含炭黑的非磁性颗粒 平均粒径为0.1〜1.0μm，（b）粘合剂，其包含（i）相对于粘合剂的总量为150kg / cm 2以下的100质量％以上的模量为50重量％以上的树脂 ，和（ii）二苯基甲烷二异氰酸酯型硬化剂，相对于每100重量份粘合剂，背衬层中总含有的非磁性颗粒的量为40〜300重量份的非磁性颗粒。

    Magnetic recording medium
    97.
    发明授权
    Magnetic recording medium 失效
    磁记录介质

    公开(公告)号：US4656088A

    公开(公告)日：1987-04-07

    申请号：US768608

    申请日：1985-08-23

    Applicant: Fumihiro Tokunaga ,  Takamitsu Asai ,  Masaaki Fujiyama

    Inventor： Fumihiro Tokunaga ,  Takamitsu Asai ,  Masaaki Fujiyama

    IPC: G11B5/706 ,  C09D5/23 ,  C09D7/12 ,  G11B5/708

    CPC classification number: G11B5/708 ,  Y10S428/90 ,  Y10T428/25 ,  Y10T428/256 ,  Y10T428/257 ,  Y10T428/258

    Abstract: A magnetic recording medium is disclosed. The medium comprises a non-magnetic support having provided thereon a magnetic layer comprising a binder, a magnetic powder and a powder of an oxide represented by the formula:M-1.multidot.M-2.multidot.O.sub.2+xwherein M-1 is at least one of barium, strontium, lead and calcium; M-2 is at least one member of titanium, zirconium and tin; and x represents a number of from 0 to 0.9. The medium has a high S/N ratio and improved wear resistance and causes only moderate wear of a magnetic head.

    Abstract translation: 公开了一种磁记录介质。 介质包括非磁性载体，其上设置有包含粘合剂，磁性粉末和由下式表示的氧化物粉末的磁性层：M-1×2M-2xO2 + x，其中M-1是钡， 锶，铅和钙; M-2是钛，锆和锡中的至少一种; x表示0〜0.9的数。 该介质具有高的S / N比和改进的耐磨性，并且仅导致磁头的适度的磨损。

    Magnetic recording medium comprising a surface-treated abrasive
    98.
    发明授权
    Magnetic recording medium comprising a surface-treated abrasive 失效
    包含表面处理磨料的磁记录介质

    公开(公告)号：US4634627A

    公开(公告)日：1987-01-06

    申请号：US796521

    申请日：1985-11-08

    Applicant: Kuniharu Fujiki ,  Hiroshi Togashi

    Inventor： Kuniharu Fujiki ,  Hiroshi Togashi

    IPC: C09D5/23 ,  C09D7/12 ,  G11B5/708 ,  G11B3/70

    CPC classification number: G11B5/7085 ,  Y10S428/90 ,  Y10T428/25 ,  Y10T428/256 ,  Y10T428/257 ,  Y10T428/2998 ,  Y10T428/31609

    Abstract: A magnetic recording medium comprising a nonmagnetic support, and a magnetic recording layer formed on said support. The magnetic recording layer comprises a magnetic powder and an abrasive powder dispersed in a resin binder. The abrasive powder has a coating of an isocyanate compound having at least two isocyanate groups in one molecule thereof and is used in an amount of from 0.5 to 20 parts by weight per 100 parts by weight of the magnetic powder.

    Abstract translation: 包括非磁性载体的磁记录介质和形成在所述载体上的磁记录层。 磁记录层包括分散在树脂粘合剂中的磁性粉末和磨料粉末。 磨料粉末在其一分子中具有至少两个异氰酸酯基团的异氰酸酯化合物的涂层，其用量为每100重量份磁性粉末0.5至20重量份。

    Abrasive, production thereof and use thereof in magnetic recording medium
    99.
    发明授权
    Abrasive, production thereof and use thereof in magnetic recording medium 失效
    研磨，制造及其在磁记录介质中的应用

    公开(公告)号：US4584243A

    公开(公告)日：1986-04-22

    申请号：US545279

    申请日：1983-10-25

    Applicant: Hidekimi Kadokura ,  Hiroshi Umezaki ,  Hideaki Murakami

    Inventor： Hidekimi Kadokura ,  Hiroshi Umezaki ,  Hideaki Murakami

    IPC: C09K3/14 ,  G11B5/708 ,  G11B5/70

    CPC classification number: G11B5/7085 ,  C09K3/14 ,  Y10S428/90 ,  Y10T428/2991 ,  Y10T428/2993 ,  Y10T428/2995 ,  Y10T428/2996 ,  Y10T428/2998

    Abstract: When an abrasive having an oleophilic surface used in a magnetic recording medium obtained by subjecting an inorganic powder having a Mohs hardness of 5 or above and an average particle size of 2 .mu.m across or below to a dry contact treatment with a dispersing agent having an oleophilic group under grinding conditions giving an impact value of 1 G or greater is used in combination with a magnetic powder as a magnetic recording layer of magnetic recording medium, the wear at a magnetic head can be prevented and still characteristics can be improved.

    Abstract translation: 当具有用于磁记录介质中的具有亲油性表面的磨料通过使具有莫氏硬度为5或更高的平均粒度为2μm的平均粒度为2μm或以下的无机粉末进行干接触处理而获得时，该分散剂具有 与研磨条件下的亲油基团相比，与磁性粉末作为磁记录介质的磁记录层组合使用的冲击值为1G以上，能够防止磁头的磨损，从而能够提高静电特性。

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