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    • 1. 发明授权
    • Magnetic recording medium
    • 磁记录介质
    • US5175048A
    • 1992-12-29
    • US765740
    • 1991-09-26
    • Hiroo InabaMasatoshi TakahashiKazuaki Taga
    • Hiroo InabaMasatoshi TakahashiKazuaki Taga
    • C09D5/23C09D127/04C09D127/06C09D175/06G11B5/702G11B5/716G11B5/842
    • G11B5/702G11B5/716Y10S428/90Y10T428/2495Y10T428/25Y10T428/257Y10T428/265
    • A magnetic recording medium comprising a non-magnetic support having at least two magnetic layers formed thereon, the at least two magnetic layers being formed by providing, in sequence, a first magnetic layer containing first ferromagnetic powder and a first binder on a surface of the non-magnetic support and then providing a second magnetic layer containing a second binder and second ferromagnetic powder while the first layer is in a wet state, the first magnetic layer containing the first binder in an amount of 10 to 27 parts by weight based on 100 parts by weight of the first ferromagnetic powder, the second magnetic layer containing the second binder in an amount of 14 to 30 parts by weight based on 100 parts by weight of the second ferromagnetic powder, the amount of the first binder contained in the first magnetic layer being smaller than that of the second binder contained in the second magnetic layer with a difference therebetween being from 0.5 to 10 parts by weight, and a ratio (A/B) of a dry thickness (A) of the first magnetic layer to a dry thickness (B) of the second magnetic layer being from 0.5 to 3.2. The magnetic recording medium is excellent in electromagnetic conversion characteristics and running stability.
    • 一种磁记录介质,包括其上形成有至少两个磁性层的非磁性载体,所述至少两个磁性层通过依次提供含有第一铁磁性粉末和第一粘结剂的第一磁性层而形成 然后提供包含第二粘合剂和第二铁磁粉末的第二磁性层,同时第一层处于湿润状态,第一磁性层含有基于100的10至27重量份的第一粘合剂 所述第一铁磁粉末的重量份,含有所述第二粘合剂的所述第二磁性层的量为基于100重量份所述第二铁磁粉末为14〜30重量份,所述第一磁性体中含有的所述第一粘合剂的量 层比第二磁性层中包含的第二粘合剂的层小,其间的差值为0.5〜10重量份,并且ra 第一磁性层的干厚度(A)至第二磁性层的干厚度(B)的tio(A / B)为0.5至3.2。 磁记录介质具有优异的电磁转换特性和运行稳定性。
    • 2. 发明授权
    • Method of producing a magnetic recording medium
    • 制造磁记录介质的方法
    • US5073406A
    • 1991-12-17
    • US682767
    • 1991-04-09
    • Masatoshi TakahashiHiroo InabaKazuaki Taga
    • Masatoshi TakahashiHiroo InabaKazuaki Taga
    • G11B5/716G11B5/842
    • G11B5/716G11B5/842
    • A method of producing a magnetic recording medium comprises the steps of kneading and dispersing ferromagnetic powder, binder and non-ferromagnetic powder to obtain magnetic coating solutions, and applying a plurality of the magnetic coating solutions on a non-ferromagnetic substrate to form a plurality of magnetic layers on the substrate. In the kneading and dispersing step, a magnetic coating composition containing a ferromagnetic powder and a solvent of 15 to 30 wt % of the ferromagnetic powder is kneaded by a two-shaft continuous kneading and mixing machine and then dispersed by a pin type sand grinder to obtain a first magnetic solution. Another magnetic coating composition containing a ferromagnetic powder and a solvent of 30 to 50 wt % of the ferromagnetic powder is kneaded by a double-arm open kneader and then dispersed by a pin type sand grinder, and finally dispersed by a disk type sand grinder to obtain a second magnetic coating solution. In the magnetic solution applying step, the first magnetic coating solution is at first applied on said substrate and then the second magnetic coating solution is applied thereon.
    • 一种制造磁记录介质的方法包括以下步骤:将铁磁性粉末,粘合剂和非铁磁性粉末混合和分散以获得磁性涂层溶液,并将多个磁性涂覆溶液施加在非铁磁性基底上以形成多个 基底上的磁性层。 在捏合分散工序中,将含有铁磁性粉末和15〜30重量%的铁磁粉末的溶剂的磁性涂料组合物通过双轴连续捏合混合机进行混炼,然后用针式砂磨机分散 获得第一磁性溶液。 含有铁磁性粉末和铁磁性粉末的含量为30〜50重量%的溶剂的磁性涂料组合物用双臂开口捏合机捏合,然后用针式砂磨机分散,最后用盘式砂磨机分散 获得第二磁性涂层溶液。 在磁性溶液涂布步骤中,首先将第一磁性涂布溶液涂布在所述基材上,然后将第二磁性涂布液涂布在其上。
    • 3. 发明授权
    • Magnetic recording medium
    • 磁记录介质
    • US5370932A
    • 1994-12-06
    • US15293
    • 1993-02-08
    • Hiroo InabaMasatoshi TakahashiKazuaki TagaKeiji Mori
    • Hiroo InabaMasatoshi TakahashiKazuaki TagaKeiji Mori
    • G11B5/716C09D5/23C09D127/04C09D127/06C09D175/06G11B5/73B32B5/16G11B5/66
    • G11B5/716Y10T428/12931Y10T428/25Y10T428/257Y10T428/265
    • A magnetic recording medium excellent in electromagnetic properties is disclosed, which comprises a non-magnetic support and at least two magnetic layers formed thereon, each of which is mainly composed of a magnetic substance and a binder, in which a first magnetic layer (a lower layer) has a coercive force of 450 to 660 Oe, a residual magnetic flux density (Br) of 1,950 gausses or more and a thickness of 1.5 to 5 .mu.m, a second magnetic layer (an upper layer) has a coercive force of 700 to 900 Oe, a residual magnetic flux density of 1,500 gausses or more and a thickness of 1.5 to 3 .mu.m, the difference in coercive force between the first magnetic layer and the second magnetic layer is 150 to less than 300 Oe, the difference in residual magnetic flux density between the first magnetic layer and the second magnetic layer is within 600 gausses, and the total thickness of magnetic layers on the non-magnetic support is 3 to 7 .mu.m.
    • 公开了一种电磁特性优异的磁记录介质,其包括非磁性载体和形成在其上的至少两个磁性层,它们各自主要由磁性物质和粘合剂组成,其中第一磁性层 层)的矫顽力为450〜660Oe,剩余磁通密度(Br)为1,950高斯或以上,厚度为1.5〜5μm,第2磁性层(上层)的矫顽力为700 至900Oe,剩余磁通密度为1500高斯或更大,厚度为1.5至3μm,第一磁性层和第二磁性层之间的矫顽力差为150至小于300Oe, 第一磁性层和第二磁性层之间的剩余磁通密度在600高斯内,非磁性载体上的磁性层的总厚度为3〜7μm。