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    Magnetic recording medium and the method for preparing the same
    4.
    发明授权
    Magnetic recording medium and the method for preparing the same 失效
    磁记录介质及其制备方法

    公开(公告)号：US4965125A

    公开(公告)日：1990-10-23

    申请号：US182672

    申请日：1988-04-18

    申请人： Kouichi Masaki ,  Hideaki Kosha ,  Toshihiko Miura ,  Yasuo Tamai

    发明人： Kouichi Masaki ,  Hideaki Kosha ,  Toshihiko Miura ,  Yasuo Tamai

    IPC分类号： C09D5/23 ,  G11B5/70 ,  G11B5/708 ,  G11B5/71 ,  G11B5/84

    CPC分类号： G11B5/708 ,  G11B5/71 ,  Y10S428/90 ,  Y10T428/257 ,  Y10T428/30

    摘要： A magnetic recording medium is described, comprising a non-magnetic support having thereon a magnetic layer containing ferromagnetic particles dispersed in a binder, the ferromagnetic layer containing abrasive agent particles alone or in combination with lubricating agent particles, wherein the weight ratio of (a) the abrasive agent particles which are present, or each of the abrasive agent particles and lubricating agent particles which are present, within 1 .mu.m in a thickness direction from the surface of the magnetic layer to (b) the abrasive agent particles or each of the abrasive agent particles and lubricating agent particles which are present, within the whole magnetic layer is at least 100/(thickness of the magnetic layer -1) % in which the "thickness of the magnetic layer" represents the thickness in ".mu.m" and is 2 .mu.m or more.A method for preparing a magnetic recording medium comprising: coating on a non-magnetic support a first coating composition having ferromagnetic particles dispersed in a binder, and simultaneously or successively coating thereon a second coating composition having a binder in which there is despersed abrasive agent particles alone or in combination with lubricating agent particles.

    摘要翻译： 描述了一种磁记录介质，其包括其上具有包含分散在粘合剂中的铁磁性颗粒的磁性层的非磁性载体，所述铁磁层单独地包含研磨剂颗粒或与润滑剂颗粒组合，其中（a） 存在的研磨剂颗粒或存在的研磨剂颗粒和润滑剂颗粒在从磁性层的表面到厚度方向上的1μm以内，（b）研磨剂颗粒或每个 存在于整个磁性层内的研磨剂颗粒和润滑剂颗粒至少为“μm”中的“磁性层的厚度”表示厚度的至少100 /（磁性层的厚度）％）， 是2亩以上。 一种制备磁记录介质的方法，包括：在非磁性载体上涂覆分散在粘合剂中的铁磁颗粒的第一涂料组合物，同时或依次在其上涂覆具有粘合剂的第二涂料组合物，其中存在分散的研磨剂颗粒 单独或与润滑剂颗粒组合。

    Magnetic recording medium
    5.
    发明授权
    Magnetic recording medium 失效
    磁记录介质

    公开(公告)号：US4690857A

    公开(公告)日：1987-09-01

    申请号：US765485

    申请日：1985-08-14

    申请人： Ryuji Shirahata ,  Yasuo Tamai

    发明人： Ryuji Shirahata ,  Yasuo Tamai

    IPC分类号： G11B5/72

    CPC分类号： G11B5/72 ,  Y10S428/90 ,  Y10T428/24975 ,  Y10T428/265 ,  Y10T428/31504

    摘要： A magnetic recording medium comprising a non-magnetic support having provided thereon, in sequence a thin ferromagnetic metal film, and at least one monomolecular layer comprising a saturated fatty acid salt of at least one metal selected from the group consisting of Cd, Co, Mn and Pb, or a polymer of a fatty acid or a derivative thereof.

    摘要翻译： 一种磁记录介质，包括非磁性载体，其中依次具有薄的铁磁金属膜，和至少一个单分子层，其包含选自Cd，Co，Mn中的至少一种金属的饱和脂肪酸盐 和Pb，或脂肪酸或其衍生物的聚合物。

    Magnetic tape having a leader tape
    6.
    发明授权
    Magnetic tape having a leader tape 失效
    带磁带的磁带

    公开(公告)号：US4680225A

    公开(公告)日：1987-07-14

    申请号：US750358

    申请日：1985-07-01

    申请人： Hiroshi Ogawa ,  Chiaki Mizuno ,  Yasuo Tamai ,  Koozi Kamiyama

    发明人： Hiroshi Ogawa ,  Chiaki Mizuno ,  Yasuo Tamai ,  Koozi Kamiyama

    IPC分类号： G11B5/627

    CPC分类号： G11B5/627 ,  Y10S428/90 ,  Y10T428/265 ,  Y10T428/31786 ,  Y10T428/31855

    摘要： A magnetic tape having a leader tape excellent in cleaning effect as well as antistatic effect and free from head clogging is provided comprising a coating layer provided on one or both sides of a support, at at least one end of the magnetic tape, in which the coating layer contains, as predominant components, an electrically conductive powder and a binder and the leader tape has a percent photo-transmission of at least 20%.

    摘要翻译： 提供一种具有清洁效果优异以及抗静电效果且没有头部堵塞的引带的磁带，其包括在磁带的至少一端设置在支撑体的一侧或两侧上的涂层，其中 作为主要组分的涂层包含导电粉末和粘合剂，并且引带带具有至少20％的光透射百分比。

    Copolymer binder for a magnetic recording medium
    7.
    发明授权
    Copolymer binder for a magnetic recording medium 失效
    用于磁记录介质的共聚物粘合剂

    公开(公告)号：US4568613A

    公开(公告)日：1986-02-04

    申请号：US486178

    申请日：1983-04-18

    申请人： Shinji Saito ,  Hiroshi Ogawa ,  Yasuo Tamai

    发明人： Shinji Saito ,  Hiroshi Ogawa ,  Yasuo Tamai

    IPC分类号： C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  G11B5/702 ,  G11B5/70

    CPC分类号： G11B5/7023 ,  Y10S428/90 ,  Y10T428/31609 ,  Y10T428/31935

    摘要： A magnetic recording medium is disclosed which is comprised of a support base having positioned thereon a magnetic layer having a ferromagnetic powder dispersed in a binder composition. The binder composition is comprised of a vinyl chloride-vinyl alcohol copolymer in an amount of 40 wt % to about 95 wt %. The copolymer contains 1 wt % to less than 8 wt % of vinyl alcohol component and 0 to 2 wt % of vinyl acetate component. By using the binder composition which includes the copolymer the resulting magnetic recording medium have excellent surface smoothness, good dispersion of ferromagnetic powder, excellent electromagnetic properties, as well as excellent running property and durability.

    摘要翻译： 公开了一种磁记录介质，其包括其上定位有分散在粘合剂组合物中的铁磁粉末的磁性层的支撑基底。 粘合剂组合物由40重量％至约95重量％的氯乙烯 - 乙烯醇共聚物组成。 共聚物含有1重量％至小于8重量％的乙烯醇组分和0至2重量％的乙酸乙烯酯组分。 通过使用包含共聚物的粘合剂组合物，所得到的磁记录介质具有优异的表面光滑度，铁磁粉末的良好分散性，优异的电磁特性，以及优异的运行性能和耐久性。