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1.发明授权
公开(公告)号：US5384175A
公开(公告)日：1995-01-24
申请号：US959795
申请日：1992-10-13
CPC分类号： G11B5/70605 , G11B5/738 , Y10S428/90 , Y10T428/25 , Y10T428/265 , Y10T428/30
摘要： A novel magnetic recording disc is provided comprising, a nonmagnetic support having thereon a nonmagnetic layer comprising nonmagnetic particles and a binder resin, and a magnetic layer comprising ferromagnetic particles and a binder resin, in this order. The nonmagnetic particles in the nonmagnetic layer are partially or entirely electrically conductive particles, the thickness of the magnetic layer is in the range of 0.5 .mu.m or less, and the orientation ratio of the ferromagnetic particles in the magnetic layer is 0.85 or more.A novel process for preparing the magnetic recording disc is provided. Further, a novel process for recording and reproduction of a signal having a shortest recordable wavelength of 1.5 .mu.m or less is provided, which utilizes the magnetic recording disc in conjunction with a magnetic head having a gap length (.delta.) of 0.50 .mu.m or less.
摘要翻译： 提供了一种新颖的磁记录盘，其包括：非磁性载体，其上具有包含非磁性颗粒和粘合剂树脂的非磁性层，以及包含铁磁颗粒和粘合剂树脂的磁性层。 非磁性层中的非磁性颗粒是部分或全部是导电颗粒，磁性层的厚度在0.5μm或更小的范围内，并且磁性层中铁磁性颗粒的取向比为0.85以上。 提供了一种制备磁记录盘的新颖方法。 另外，提供了一种用于记录和再现具有最小可记录波长为1.5μm或更小的信号的新颖方法，其利用磁记录盘与间隙长度（delta）为0.50μm的磁头或 减。
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2.发明授权Magnetic recording disc comprising magnetic powder and a binder in a container which includes a nonwoven fabric liner comprising polypropylene and rayon fibers 失效磁性记录盘包括磁性粉末和粘合剂在容器中，该容器包括包含聚丙烯和人造纤维的非织造织物衬里
公开(公告)号：US5370917A
公开(公告)日：1994-12-06
申请号：US74668
申请日：1993-06-10
IPC分类号： G11B5/82 , G11B23/033 , G11B23/50 , G11B5/00
CPC分类号： G11B23/0332 , G11B23/505 , G11B5/825 , Y10S428/90
摘要： A magnetic recording disc is disclosed which comprises a disc container with a liner comprising nonwoven fabric in which a flexible magnetic disc comprising a flexible non-magnetic support having on at least one side thereof a magnetic layer mainly comprising a ferromagnetic powder and a binder resin is rotably set, wherein said liner comprises (1) a nonwoven fabric layer mainly comprising rayon fiber on at least the side in contact with the magnetic layer, and (2) a nonwoven fabric layer mainly comprising polypropylene fiber, and said liner comprises from 70 to 80% by weight based on the liner of rayon fiber and from 20 to 30% by weight based on the liner of polypropylene fiber.
摘要翻译： 公开了一种磁记录盘，其包括具有包括无纺织物的衬垫的盘容器，其中包括柔性非磁性支撑件的柔性磁盘在其至少一侧上具有主要包含铁磁粉末和粘合剂树脂的磁性层， 其特征在于，所述衬垫包括：（1）至少在与所述磁性层接触的一侧的主要包含人造丝纤维的非织造织物层，以及（2）主要包含聚丙烯纤维的非织造织物层，所述衬垫包括70〜 基于人造丝纤维的衬里为80重量％，基于聚丙烯纤维的衬里为20〜30重量％。
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公开(公告)号：US5300314A
公开(公告)日：1994-04-05
申请号：US993616
申请日：1992-12-21
CPC分类号： G11B5/848
摘要： The present invention relates to a magnetic recording medium comprising, in the following order:(a) a nonmagnetic support;(b) a nonmagnetic layer comprising nonmagnetic particles and a binder resin; and(c) a magnetic layer comprising ferromagnetic particles and a binder resin;wherein said magnetic layer has a thickness of 0.8 .mu.m or less and said nonmagnetic layer and said magnetic layer are formed by a process which comprises the steps of coating a nonmagnetic layer coating solution on said nonmagnetic support, and then subsequently coating a magnetic layer coating solution on said nonmagnetic layer coating solution wile said nonmagnetic layer is wet and, further, wherein the solvent used in said nonmagnetic layer coating solution has a higher boiling point than the solvent used in said magnetic layer coating solution.Further, the present invention relates to a process for preparing a magnetic recording medium, which comprises the steps of:(a) coating a nonmagnetic layer coating solution comprising nonmagnetic particles dispersed in a binder resin solution on a nonmagnetic support to form a nonmagnetic coating layer,(b) coating a magnetic layer coating solution comprising ferromagnetic particles dispersed in a binder resin solution on said nonmagnetic coating layer while said nonmagnetic coating layer is wet, and(c) drying to form a nonmagnetic layer and a magnetic layer on said nonmagnetic support;wherein the boiling point of the solvent used for said nonmagnetic layer coating solution is higher than the boiling point of the solvent used in said magnetic layer coating solution.
摘要翻译： 磁记录介质技术领域本发明涉及一种磁记录介质，其特征在于，包括以下顺序：（a）非磁性载体; （b）包含非磁性颗粒和粘合剂树脂的非磁性层; 和（c）包含铁磁颗粒和粘合剂树脂的磁性层; 其中所述磁性层的厚度为0.8（my）m以下，所述非磁性层和所述磁性层通过以下步骤形成，所述方法包括以下步骤：在所述非磁性载体上涂覆非磁性层涂布溶液，然后涂覆磁性层 在所述非磁性层涂布溶液上的所述非磁性层涂布溶液的层状涂层溶液是湿的，此外，其中所述非磁性层涂布溶液中使用的溶剂的沸点高于所述磁性层涂布溶液中使用的溶剂。 此外，本发明涉及一种制备磁记录介质的方法，其包括以下步骤：（a）将包含分散在粘合剂树脂溶液中的非磁性颗粒的非磁性层涂布溶液涂布在非磁性载体上以形成非磁性涂层 ，（b）在所述非磁性涂层为湿的同时，将包含分散在所述非磁性涂层上的粘结剂树脂溶液中的铁磁性粒子的磁性层涂布溶液涂布在所述非磁性载体上，并且（c）在所述非磁性载体上形成非磁性层和磁性层 ; 其中用于所述非磁性层涂布溶液的溶剂的沸点高于所述磁性层涂布溶液中使用的溶剂的沸点。
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公开(公告)号：US5455093A
公开(公告)日：1995-10-03
申请号：US45252
申请日：1993-04-13
IPC分类号： G11B5/842 , C09D5/23 , C09D127/04 , C09D127/06 , C09D175/00 , C09D175/04 , G11B5/70 , G11B5/73 , G11B5/738 , B32B3/02 , B32B5/16 , G11B5/66
CPC分类号： G11B5/738 , G11B5/70 , Y10T428/25 , Y10T428/256 , Y10T428/26 , Y10T428/265
摘要： A flexible magnetic disk is disclosed, which comprises a non-magnetic support having thereon a non-magnetic layer comprising mainly a non-magnetic powder and a binder resin, and a magnetic layer comprising mainly a ferromagnetic layer and a binder resin, in this order, wherein at least a part of the non-magnetic powder in the non-magnetic layer is an electrically conductive powder, and therein the product Et.sup.3 of Young's modulus (E) of the flexible magnetic disk and the cube of the thickness (t) thereof is 50 to 210 g.multidot.mm. The magnetic layer preferably has a thickness of not more than 0.5 .mu.m and the ferromagnetic powder preferably is ferromagnetic metallic powder or ferromagnetic hexagonal ferrite powder.
摘要翻译： 公开了一种柔性磁盘，其包括非磁性载体，其上具有主要包含非磁性粉末和粘合剂树脂的非磁性层，以及主要包含铁磁性层和粘合剂树脂的磁性层，按此顺序 其中非磁性层中的至少一部分非磁性粉末是导电粉末，其中柔性磁盘的杨氏模量（E）和其厚度（t）的立方体的乘积Et3 是50到210 gxmm。 磁性层优选具有不大于0.5μm的厚度，铁磁性粉末优选为强磁性金属粉末或铁磁六角铁氧体粉末。
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公开(公告)号：US5958565A
公开(公告)日：1999-09-28
申请号：US848596
申请日：1997-04-28
CPC分类号： G11B5/7305 , G11B5/70 , G11B5/733 , G11B5/735 , Y10S428/90 , Y10T428/24975 , Y10T428/25 , Y10T428/258 , Y10T428/265
摘要： A magnetic recording tape favorably employable for computer data storage has a flexible polymer web, a magnetic recording layer arranged on one surface side of the web, and a backing layer arranged on another surface side of the web, characterized in that the recording tape has a thickness of 2 to 8 .mu.m and shows a Young's modulus of not less than 1,200 kg/mm.sup.2 in its longitudinal direction; and the backing layer has a thickness of 0.2 to 1 .mu.m and is composed of a binder, a carbon black, a non-magnetic powder I having Mohs' scale of hardness of 3 to 4.5 and another non-magnetic powder II having Mohs' scale of hardness of 5 to 9. Between the magnetic layer and the flexible polymer web, a non-magnetic undercoating layer composed of a binder and a non-magnetic powder can be provided.
摘要翻译： 有利地用于计算机数据存储的磁记录带具有柔性聚合物网，布置在网的一个表面侧的磁记录层和布置在网的另一表面侧上的背衬层，其特征在于记录带具有 厚度为2〜8μm，纵向杨氏模量为1200kg / mm2以上。 背衬层的厚度为0.2〜1μm，由粘合剂，炭黑，莫氏硬度为3〜4.5的非磁性粉末I和具有Mohs' 在硬磁性层和柔性聚合物网之间，可以提供由粘合剂和非磁性粉末组成的非磁性底涂层。
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公开(公告)号：US5549955A
公开(公告)日：1996-08-27
申请号：US419757
申请日：1995-04-10
申请人： Toshio Kawamata , Satoru Hayakawa , Yasushi Endo
发明人： Toshio Kawamata , Satoru Hayakawa , Yasushi Endo
IPC分类号： G11B5/70 , C09D5/23 , C09D127/04 , C09D127/06 , C09D175/06 , G11B5/68 , G11B5/738 , G11B5/84 , G11B5/66
CPC分类号： G11B5/68 , G11B5/738 , G11B5/84 , Y10S428/90 , Y10T428/265
摘要： A magnetic recording disk having a good overwriting characteristic and an excellent electromagnetic characteristic, as well as superior running durability. The magnetic recording disk comprises a non-magnetic support having coated thereon, in the order, a non-magnetic layer comprising mainly a non-magnetic powder and a binder resin and a magnetic layer comprising mainly a ferromagnetic powder and a binder resin, wherein the magnetic layer is formed by applying a magnetic layer coating solution onto the coated non-magnetic layer while the non-magnetic layer remains in a wet condition, the average thickness of the magnetic layer is 0.5 .mu.m or less, and the maximum thickness and the minimum thickness thereof fall within the range of .+-.15% of the average thickness of the magnetic layer.
摘要翻译： 具有良好的重写特性和优异的电磁特性的磁记录盘，以及优异的运行耐久性。 磁记录盘包括其上涂覆有非磁性层的非磁性载体，主要包括非磁性粉末和粘合剂树脂，以及主要包含铁磁性粉末和粘合剂树脂的磁性层，其中， 通过在非磁性层保持湿润状态下将磁性层涂布液施加到涂布的非磁性层上而形成磁性层，磁性层的平均厚度为0.5μm以下，最大厚度为 其最小厚度落在磁性层的平均厚度的+/- 15％的范围内。
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7.发明授权Magnetic recording medium comprising an underlayer of non magnetic powder and binder resin and a magnetic layer with a specified Young's modulus 失效磁记录介质包括非磁性粉末和粘合剂树脂的底层和具有特定杨氏模量的磁性层
公开(公告)号：US5358777A
公开(公告)日：1994-10-25
申请号：US19257
申请日：1993-02-18
申请人： Masaya Kojima , Satoru Hayakawa , Toshio Kawamata
发明人： Masaya Kojima , Satoru Hayakawa , Toshio Kawamata
IPC分类号： G11B5/82 , C09D5/23 , C09D7/12 , G11B5/70 , G11B5/73 , G11B5/733 , G11B5/738 , G11B5/842 , G11B5/00
CPC分类号： G11B5/738 , Y10S428/90 , Y10T428/24942 , Y10T428/265
摘要： A magnetic recording medium comprising (A) a non-magnetic support; (B) a non-magnetic layer comprising mainly a non-magnetic powder and a binder resin; and (C) a magnetic layer comprising mainly a ferromagnetic powder and a binder resin, wherein said non-magnetic layer is coated on said non-magnetic support; and said magnetic layer is coated over the previously formed non-magnetic layer while the previously formed non-magnetic layer is still wet; the thickness of the magnetic layer is 0.6 .mu.m or less; the Young's Modulus of the magnetic layer is from 50% to 95% of the Young's Modulus of the non-magnetic layer, and the glass transition temperature of the magnetic layer is lower than that of the non-magnetic layer. The magnetic recording medium has good electromagnetic characteristics and excellent running stability and running durability. It is suitable as a disc medium for high-density recording at a shortest recording wavelength of 1.5 .mu.m or less, displaying excellent overwriting characteristic in high-density recording. The running reliability of the magnetic recording medium is good.
摘要翻译： 一种磁记录介质，包括（A）非磁性载体; （B）主要包含非磁性粉末和粘合剂树脂的非磁性层; 和（C）主要包含铁磁性粉末和粘合剂树脂的磁性层，其中所述非磁性层涂覆在所述非磁性载体上; 并且所述磁性层涂覆在先前形成的非磁性层上，同时先前形成的非磁性层仍然是湿的; 磁性层的厚度为0.6μm以下; 磁性层的杨氏模量是非磁性层的杨氏模量的50％至95％，并且磁性层的玻璃化转变温度低于非磁性层的玻璃化转变温度。 磁记录介质具有良好的电磁特性和良好的运行稳定性和运行耐久性。 适合于在1.5μm以下的最短记录波长下进行高密度记录的盘式介质，在高密度记录中显示优异的重写特性。 磁记录介质的运行可靠性好。
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公开(公告)号：US5389418A
公开(公告)日：1995-02-14
申请号：US108455
申请日：1993-08-19
申请人： Masataka Ota , Yasushi Endo , Satoru Hayakawa , Toshio Kawamata
发明人： Masataka Ota , Yasushi Endo , Satoru Hayakawa , Toshio Kawamata
CPC分类号： G11B5/738 , G11B5/70 , Y10S428/90 , Y10T428/24942 , Y10T428/2495 , Y10T428/25 , Y10T428/265
摘要： There is disclosed a flexible magnetic recording disk which is suitable as a high capacity magnetic disk for data recording and has an excellent durability. The flexible magnetic recording disk comprises a non-magnetic support having thereon a non-magnetic layer comprising a non-magnetic powder and a binder resin, and a magnetic layer comprising a ferromagnetic powder and a binder resin, in this order, wherein the magnetic layer has a thickness of 1 .mu.m or less, which is 1/2 or less of the thickness of the non-magnetic layer; and the magnetic layer further contains the abrasive particles which comprise a first abrasive particles having a Mohs' hardness of 6 or more and an average particle size of 0.8 to 1.4 times as large as the average particle size of the magnetic powder and a second abrasive particles having a Mohs' hardness of 6 or more and an average particle size of 2 to 4 times as large as the average particle size of the ferromagnetic powder.
摘要翻译： 公开了一种适合作为用于数据记录的高容量磁盘的柔性磁记录盘，并且具有优异的耐久性。 柔性磁记录盘包括非磁性载体，其上具有包含非磁性粉末和粘结剂树脂的非磁性层，以及包含铁磁性粉末和粘合剂树脂的磁性层，其中磁性层 的厚度为1μm以下，为非磁性层的厚度的1/2以下。 并且所述磁性层还包含所述磨料颗粒，所述磨料颗粒包含莫氏硬度为6或更高的第一磨料颗粒和平均粒径为磁粉的平均粒度的0.8至1.4倍的第二磨料颗粒 莫氏硬度为6以上，平均粒径为铁磁性粉末的平均粒径的2〜4倍。
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公开(公告)号：US5112679A
公开(公告)日：1992-05-12
申请号：US419361
申请日：1989-10-10
申请人： Jun Nakagawa , Toshio Kawamata , Kunihiko Sano
发明人： Jun Nakagawa , Toshio Kawamata , Kunihiko Sano
IPC分类号： G11B5/66 , C09D5/23 , C09D101/18 , C09D127/04 , C09D127/06 , C09D175/00 , C09D175/04 , G11B5/706 , G11B5/708 , G11B5/71 , G11B5/72 , G11B5/738 , G11B5/82 , G11B5/84
CPC分类号： G11B5/708 , G11B5/72 , G11B5/8408 , Y10S428/90 , Y10T428/25
摘要： A magnetic disk comprising a non-magnetic support having provided thereon a magnetic layer comprising ferromagnetic particles, and a binder resin, wherein said magnetic layer is such that when sputtering is conducted on said magnetic layer from the surface of the magnetic layer in the direction of the depth of the magnetic layer by the Auger electron spectroscopic method, and the concentration of carbon atoms resulting from the sputtering is measured, a sputtering time (T.sub.1) required for the carbon atom concentration to be (C.sub.0 +C.sub.2)/2 is in the range of from 8 to 98 minutes, wherein C.sub.0 is a carbon atom concentration value obtained at the initiation of the sputtering and C.sub.2 is a carbon atom concentration value after the carbon atom concentration becomes constant.
摘要翻译： 一种磁盘，其包括非磁性载体，其上设置有包含铁磁颗粒的磁性层和粘合剂树脂，其中所述磁性层使得当从所述磁性层的表面在所述磁性层上沿着 通过俄歇电子光谱法测定磁性层的深度，测定由溅射得到的碳原子浓度，碳原子浓度为（C0 + C2）/ 2所需的溅射时间（T1）为 范围为8〜98分钟，其中，C 0为在溅射开始时得到的碳原子浓度值，C2为碳原子浓度恒定后的碳原子浓度值。
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公开(公告)号：US5024885A
公开(公告)日：1991-06-18
申请号：US252076
申请日：1988-09-30
申请人： Yasushi Endo , Mikihiko Kato , Toshio Kawamata , Kouichi Masaki
发明人： Yasushi Endo , Mikihiko Kato , Toshio Kawamata , Kouichi Masaki
CPC分类号： G11B5/70678 , Y10S428/90 , Y10T428/257 , Y10T428/31569
摘要： A magnetic recording medium is described, comprising a nonmagnetic support having thereon a magnetic layer containing ferromagnetic particles which are a hexagonal system tabular particle, and which have an axis of easy magnetization in a direction of perpendicular to the major axis of the plate and are dispersed in a binder, wherein said ferromagnetic particles have a saturation magnetization of 60 emu/g or higher, a specific surface area (BET method) of from 25 to 70 m.sup.2 /g, an average particle diameter of from 0.01 to 0.2 .mu.m, and a coercive force of from 400 to 2000 oersteds, and said biner contains a resin having at least one kind of polar group in an amount of 1.times.10.sup.-5 eq/g or more of the polar group.
摘要翻译： 描述了一种磁记录介质，其包括非磁性载体，其上具有包含六方晶系平板状颗粒的铁磁颗粒的磁性层，并且在垂直于该板的长轴的方向上具有容易磁化的轴并且分散 在粘合剂中，其中所述铁磁性颗粒的饱和磁化强度为60emu / g以上，比表面积（BET法）为25〜70m 2 / g，平均粒径为0.01〜0.2μm， 矫顽力为400〜2000奥斯特，所述膳食酒含有极性基团为1×10 -5 eq / g以上的至少1种极性基团的树脂。
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