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1. 发明授权

US5085915A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US5085915A
公开(公告)日：1992-02-04
申请号：US640512
申请日：1991-01-11
申请人： Kazuaki Taga , Takeshi Tsuda , Hiroo Inaba , Hiroshi Ogawa
发明人： Kazuaki Taga , Takeshi Tsuda , Hiroo Inaba , Hiroshi Ogawa
IPC分类号： C09D5/23 , C09D127/04 , C09D127/06 , C09D175/06 , G11B5/716 , G11B5/73 , G11B5/733
CPC分类号： G11B5/716 , G11B5/733 , Y10S428/90 , Y10T428/24355 , Y10T428/25 , Y10T428/257 , Y10T428/259 , Y10T428/31786
摘要： A magnetic recording medium which comprises plurality of magnetic layers comprising at least first and second magnetic layers which are successively formed on a surface of a polyethylene terephthalate support, wherein said support contains inert inorganic particles having an average particle size of from 0.5 to 0.7 microns, a standard deviation of 0.1 microns or less and the surface of said support has a center line average roughness (Ra) of 16 nm or less and a density of protrusions (Ds) of 6000/mm.sup.2 or more in the case of protrusions of 0.7 microns of more.
摘要翻译：一种磁记录介质，其包括至少包含第一和第二磁性层的多个磁性层，所述磁性层依次形成在聚对苯二甲酸乙二醇酯载体的表面上，其中所述载体包含平均粒径为0.5至0.7微米的惰性无机颗粒， 0.1微米或更小的标准偏差，并且在0.7微米的突起的情况下，所述支撑体的表面的中心线平均粗糙度（Ra）为16nm以下，突起的密度（Ds）为6000 / mm2以上的更多。

2. 发明授权

US5178935A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US5178935A
公开(公告)日：1993-01-12
申请号：US419238
申请日：1989-10-10
申请人： Shinji Saito , Hiroshi Ogawa , Naoyoshi Chino , Hiroo Inaba , Kazuaki Taga
发明人： Shinji Saito , Hiroshi Ogawa , Naoyoshi Chino , Hiroo Inaba , Kazuaki Taga
IPC分类号： G11B5/716
CPC分类号： G11B5/716 , Y10S428/90 , Y10T428/24942 , Y10T428/265 , Y10T428/31609
摘要： A magnetic recording comprising a non-magnetic support having thereon first and second magnetic layers containing a binder and a ferromagnetic powder. In a first embodiment, the content of the binder in each magnetic layer containing a vinyl chloride resin or a cellulose resin is characterized in relation to the quantity of the ferromagnetic powder contained therein. In a second embodiment, each of the magnetic layers is characterized in terms of a difference in glass transition point of a polyurethane resin contained therein. In a third embodiment, each of the magnetic layers is characterized in terms of thickness and polyisocyanate content, wherein the content of the polyisocyanate in the first magnetic layer is at least one part by weight larger than the amount of the polyisocyanate in the second magnetic layer.
摘要翻译：磁记录包括其上具有包含粘合剂和铁磁性粉末的第一和第二磁性层的非磁性载体。在第一实施方案中，含有氯乙烯树脂或纤维素树脂的每个磁性层中的粘合剂的含量的特征在于其中所含的铁磁性粉末的量。在第二实施方案中，每个磁性层的特征在于其中含有的聚氨酯树脂的玻璃化转变点的差异。在第三实施方案中，每个磁性层的特征在于厚度和多异氰酸酯含量，其中第一磁性层中多异氰酸酯的含量比第二磁性层中的多异氰酸酯的量大至少一个重量份。

3. 发明授权

US5316845A Magnetic recording medium comprising two magnetic layers each layer comprising ferromagnetic powder, binder, a branched and unbranched silicone, with carbon black in the upper layer 失效
标题翻译：磁记录介质包括两层磁性层，每层包含铁磁性粉末，粘合剂，支链和非支化硅氧烷，上层为炭黑
公开(公告)号：US5316845A
公开(公告)日：1994-05-31
申请号：US69681
申请日：1993-06-01
申请人： Masatoshi Takahashi , Hiroo Inaba , Kazuaki Taga
发明人： Masatoshi Takahashi , Hiroo Inaba , Kazuaki Taga
IPC分类号： G11B5/708 , B32B27/18 , B32B33/00 , C09C1/48 , C09D5/23 , C09D7/12 , C10M103/02 , C10M105/24 , C10M105/34 , C10M107/50 , C10N40/18 , C10N70/00 , G11B5/71 , G11B5/716 , G11B5/00
CPC分类号： G11B5/71 , G11B5/716 , Y10S428/90 , Y10T428/25 , Y10T428/265 , Y10T428/31663
摘要： A magnetic recording medium comprising a nonmagnetic support and at least two magnetic layers on the support, each magnetic layer containing a ferromagnetic powder and a binder, wherein the lower magnetic layer comprises at least one layer containing a branched fatty acid-modified silicone, but not carbon black, and the upper magnetic layer comprises at least one layer containing a branched fatty acid-modified silicone and carbon black having a DBP absorption oil amount of 100 to 250 ml/100 g. The magnetic recording medium has improved lubricating characteristics.
摘要翻译：一种包含非磁性载体和载体上的至少两个磁性层的磁记录介质，每个磁性层含有铁磁性粉末和粘合剂，其中下部磁性层包含至少一层含有支链脂肪酸改性硅氧烷但不含碳黑，上磁性层包含含有支链脂肪酸改性硅氧烷和DBP吸收油量为100〜250ml / 100g的炭黑的至少一层。磁记录介质具有改善的润滑特性。

4. 发明授权

US5370932A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US5370932A
公开(公告)日：1994-12-06
申请号：US15293
申请日：1993-02-08
申请人： Hiroo Inaba , Masatoshi Takahashi , Kazuaki Taga , Keiji Mori
发明人： Hiroo Inaba , Masatoshi Takahashi , Kazuaki Taga , Keiji Mori
IPC分类号： G11B5/716 , C09D5/23 , C09D127/04 , C09D127/06 , C09D175/06 , G11B5/73 , B32B5/16 , G11B5/66
CPC分类号： G11B5/716 , Y10T428/12931 , Y10T428/25 , Y10T428/257 , Y10T428/265
摘要： 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.
摘要翻译：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。

5. 发明授权

US5175048A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US5175048A
公开(公告)日：1992-12-29
申请号：US765740
申请日：1991-09-26
申请人： Hiroo Inaba , Masatoshi Takahashi , Kazuaki Taga
发明人： Hiroo Inaba , Masatoshi Takahashi , Kazuaki Taga
IPC分类号： C09D5/23 , C09D127/04 , C09D127/06 , C09D175/06 , G11B5/702 , G11B5/716 , G11B5/842
CPC分类号： G11B5/702 , G11B5/716 , Y10S428/90 , Y10T428/2495 , Y10T428/25 , Y10T428/257 , Y10T428/265
摘要： 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.
摘要翻译：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。

6. 发明授权

US5139865A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US5139865A
公开(公告)日：1992-08-18
申请号：US557840
申请日：1990-07-26
申请人： Hiroo Inaba , Kazuaki Taga , Toshihiko Miura
发明人： Hiroo Inaba , Kazuaki Taga , Toshihiko Miura
IPC分类号： C09D5/23 , C09D127/04 , C09D127/06 , C09D175/06 , G11B5/716 , G11B5/73
CPC分类号： G11B5/70 , G11B5/70621 , G11B5/716 , G11B5/738 , Y10T428/25 , Y10T428/257
摘要： A magnetic recording medium comprising a non-magnetic support having thereon a plurality of magnetic layers each comprising a ferromagnetic powder dispersed in a binder, wherein the layer located within a thickness of 0.5 .mu.m from an uppermost surface of said plurality of magnetic layers and a layer located within a thickness of 0.5 .mu.m above the adjacent non-magnetic support have a higher packing density of ferromagnetic powder than an interlayer interposed therebetween. In a preferred embodiment, the interlayer consists of two layers and there are provided on the non-magnetic support a 1st magnetic layer, a 2nd magnetic layer, a 3rd magnetic layer and a 4th magnetic layer in this order from the non-magnetic support; the sum of the thickness of said 3rd magnetic layer and said 4th magnetic layer being not more than 3.5 .mu.m.
摘要翻译：一种磁记录介质，包括其上具有多个磁性层的非磁性载体，每个磁性层各自包含分散在粘合剂中的铁磁性粉末，其中位于距所述多个磁性层的最上表面0.5μm的厚度的层和位于相邻非磁性支撑体上方0.5μm厚度的层具有比夹在其间的夹层更高的铁磁性粉末的堆积密度。在优选实施例中，中间层由两层组成，非磁性载体上依次设有第一磁性层，第二磁性层，第三磁性层和第四磁性层; 所述第三磁性层和所述第四磁性层的厚度之和不大于3.5μm。

7. 发明授权

US5073406A Method of producing a magnetic recording medium 失效
标题翻译：制造磁记录介质的方法
公开(公告)号：US5073406A
公开(公告)日：1991-12-17
申请号：US682767
申请日：1991-04-09
申请人： Masatoshi Takahashi , Hiroo Inaba , Kazuaki Taga
发明人： Masatoshi Takahashi , Hiroo Inaba , Kazuaki Taga
IPC分类号： G11B5/716 , G11B5/842
CPC分类号： G11B5/716 , G11B5/842
摘要： 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.
摘要翻译：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。

8. 发明授权

US5075167A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US5075167A
公开(公告)日：1991-12-24
申请号：US406664
申请日：1989-09-13
申请人： Koichi Yamauchi , Hiroo Inaba , Hiroshi Ogawa
发明人： Koichi Yamauchi , Hiroo Inaba , Hiroshi Ogawa
IPC分类号： G11B5/702 , C09D5/23 , C09D127/04 , C09D127/06 , C09D175/00 , C09D175/04 , G11B5/71 , G11B5/716
CPC分类号： G11B5/71 , G11B5/716 , Y10S428/90 , Y10T428/265
摘要： A magnetic recording medium exhibiting good still durability and good running properties is disclosed, which comprises a non-magnetic support having thereon a first magnetic layer and a second magnetic layer in sequence, the first and second magnetic layers containing ferromagnetic powder and a binder, wherein a fatty acid ester (A) having the following structure is contained in the first magnetic layer and a fatty acid ester (B) having the following structure is contained in the second magnetic layer: ##STR1##
摘要翻译：公开了一种表现出良好的耐久性和良好的运行性能的磁记录介质，其包括其上依次具有第一磁性层和第二磁性层的非磁性载体，所述第一和第二磁性层含有铁磁粉末和粘合剂，其中具有以下结构的脂肪酸酯（A）包含在第一磁性层中，并且具有以下结构的脂肪酸酯（B）包含在第二磁性层中：脂肪酸酯（A）脂肪酸酯（B）（B）

9. 再颁专利

USRE36271E Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：USRE36271E
公开(公告)日：1999-08-17
申请号：US903353
申请日：1992-06-24
申请人： Hiroo Inaba , Shinji Saito , Hiroshi Ogawa
发明人： Hiroo Inaba , Shinji Saito , Hiroshi Ogawa
IPC分类号： G11B5/702 , C09D5/23 , G11B5/708 , G11B5/716 , G11B23/00
CPC分类号： G11B5/708 , G11B5/716 , Y10S428/90 , Y10T428/24967 , Y10T428/257 , Y10T428/265 , Y10T428/30
摘要： A magnetic recording medium comprises a non-magnetic support having provided thereon a lower magnetic layer having a thickness of 2.5 .mu.m or higher and an upper magnetic layer having a thickness of 2 .mu.m or lower in this order, wherein both the upper and lower magnetic layers contain ferromagnetic particles, and the lower magnetic layer contains carbon black having an average primary particle diameter of less than 20 .mu.m in the amount of from 1.0 to 20 parts by weight per 100 parts by weight of the ferromagnetic particles contained in the lower magnetic layer, and the upper magnetic layer contains carbon black having an average primary particle diameter of at least 40 .mu.m but less than 80 .mu.m in an amount of from 0.1 to 10.0 parts by weight per 100 parts by weight of the ferromagnetic particles contained in the upper magnetic layer, but less than the amount of carbon black used in the lower magnetic layer.
摘要翻译：磁记录介质包括具有厚度为2.5μm或更高的下磁性层和厚度为2μm或更小的上磁层的非磁性载体，其中上和下两个磁性层含有铁磁性粒子，下部磁性层含有平均一次粒径小于20μm的碳黑，相对于100重量份以下的铁磁性粒子为100重量份，1.0〜20重量份磁性层，上部磁性层含有平均一次粒径为40μm以上且小于80μm的碳黑，相对于100重量份含有的铁磁性粒子，为0.1〜10.0重量份在上磁性层中，但低于下磁性层中使用的炭黑的量。

10. 发明授权

US5098773A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US5098773A
公开(公告)日：1992-03-24
申请号：US492164
申请日：1990-03-13
申请人： Shinji Saito , Hiroo Inaba , Hiroshi Ogawa , Hitoshi Noguchi
发明人： Shinji Saito , Hiroo Inaba , Hiroshi Ogawa , Hitoshi Noguchi
IPC分类号： C09D5/23 , C09D127/04 , C09D127/06 , C09D175/00 , C09D175/04 , G11B5/714 , G11B5/716
CPC分类号： G11B5/716 , G11B5/714 , Y10S428/90 , Y10T428/24942 , Y10T428/257 , Y10T428/265
摘要： A magnetic recording medium having at least two magnetic layers is disclosed, comprising first and second mangetic layers which are successively formed in order on a nonmagnetic support, wherein a coercive force (Hc) of said second magnetic layer is 5.times.10.sup.4 to 1.5.times.10.sup.5 A/m, a ratio (Br/Hc) of a residual magnetic flux density (Br) of said second magnetic layer to the coercive force (Hc) is 2.0.times.10.sup.-6 H/m or more, SFD of said second magnetic layer is 0.6 or less, an average length in the long axis of magnetic particles in said second magnetic layer is 0.25 microns or less, a center line average surface roughness (Ra) of said second magnetic layer is 1/10 or less of the average length in the long axis of the magnetic particles, and a coercive force (Hc') of said first magnetic layer is 2.times.10.sup.4 to 1.times.10.sup.5 A/m.
摘要翻译：公开了具有至少两个磁性层的磁记录介质，包括在非磁性载体上依次形成的第一和第二凹凸层，其中所述第二磁性层的矫顽力（Hc）为5×10 4至1.5×10 5 A / m 所述第二磁性层的剩余磁通密度（Br）与所述矫顽力（Hc）的比（Br / Hc）为2.0×10 -6 H / m以上，所述第二磁性层的SFD为0.6以下所述第二磁性层中的磁性粒子长轴的平均长度为0.25微米以下，所述第二磁性层的中心线平均表面粗糙度（Ra）为长轴的平均长度的1/10以下的磁性颗粒，并且所述第一磁性层的矫顽力（Hc'）为2x104至1×105A / m。

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