公开(公告)号：US06686024B2

公开(公告)日：2004-02-03

申请号：US10131179

申请日：2002-04-25

申请人： Mikio Ohno ,  Naoto Murao ,  Toshichika Aoki ,  Hiroaki Araki

发明人： Mikio Ohno ,  Naoto Murao ,  Toshichika Aoki ,  Hiroaki Araki

IPC分类号： G11B5708

CPC分类号： G11B5/70615 ,  G11B5/7085 ,  G11B5/71 ,  G11B5/84 ,  Y10T428/25

摘要： A magnetic recording medium is formed from a non-magnetic support, and a magnetic layer formed on the support and including mainly a binder resin and a ferromagnetic metal powder including mainly Fe. The magnetic layer includes an abrasive and a lubricant. The abrasive present on the surface of the magnetic layer satisfies the relationship 0.01≦H15/H10≦0.3 where H10 denotes the number of particles per unit area having a height less than 10 nm (particles/&mgr;m2) and H5 denotes the number of particles per unit area having a height equal to or greater than 15 nm (particles/&mgr;m2). The magnetic recording medium has a surface lubricant index of 3 to 11. The height of the abrasive particles can be controlled by, for example, a blade treatment using an abrasive tape (LTBL system) or a diamond powder-studded rotating roll (DWBL system).

摘要翻译： 磁记录介质由非磁性载体和形成在载体上的磁性层形成，主要包括粘合剂树脂和主要包含Fe的强磁性金属粉末。 磁性层包括研磨剂和润滑剂。 存在于磁性层表面上的研磨剂满足0.01 <= H15 / H10 <= 0.3的关系，其中H10表示高度小于10nm的单位面积的颗粒数（颗粒/母体2），H5表示 高度等于或大于15nm的单位面积的颗粒数（颗粒/母体2）。 磁记录介质具有3至11的表面润滑指数。可以通过例如使用研磨带（LTBL系统）或金刚石粉末旋转辊（DWBL系统）的刀片处理来控制磨料颗粒的高度 ）。

公开(公告)号：US06548160B2

公开(公告)日：2003-04-15

申请号：US09728308

申请日：2000-12-01

申请人： Koji Naoe ,  Kiyomi Ejiri

发明人： Koji Naoe ,  Kiyomi Ejiri

IPC分类号： G11B5708

CPC分类号： G11B5/708 ,  Y10T428/256 ,  Y10T428/265

摘要： The present invention aims to provide a magnetic recording medium capable of high-density recording with excellent running durability and preservability as well as a magnetic recording medium capable of high-density recording with low noise even at high output and excellent running durability. Disclosed are a magnetic recording medium comprises a magnetic layer containing a ferromagnetic powder and a binder provided on a nonmagnetic flexible substrate and a magnetic recording medium comprising a nonmagnetic layer containing a nonmagnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder provided in this order on a nonmagnetic flexible substrate. Provided that said magnetic layer contains a zirconia powder having an average primary particle diameter of 0.005-0.2 &mgr;m, or said magnetic layer has an average thickness in the range of 0.04-0.3 &mgr;m, said ferromagnetic powder is a metal alloy powder having a as of 130 A.m2/kg or more, and said magnetic layer contains a granulated powder having an average primary particle diameter of 0.005-0.2 &mgr;m and a specific gravity of 5 or more.

摘要翻译： 本发明的目的是提供一种具有优异的运行耐久性和保存性的高密度记录的磁记录介质以及即使在高输出下也能够以低噪声进行高密度记录的磁记录介质和优异的运行耐久性。 磁记录介质包括含有铁磁性粉末和设置在非磁性柔性基板上的粘合剂的磁性层和包含非磁性粉末和粘合剂的非磁性层的磁记录介质和含有铁磁粉末和粘结剂的磁性层 订购非磁性柔性基板。 假设所述磁性层含有平均一次粒径为0.005-0.2μm的氧化锆粉末，或者所述磁性层的平均厚度在0.04-0.3μm的范围内，所述铁磁性粉末是具有 130Am 2 / kg以上，所述磁性层含有平均一次粒径为0.005〜0.2μm，比重为5以上的造粒粉末。

公开(公告)号：US06506470B2

公开(公告)日：2003-01-14

申请号：US09855574

申请日：2001-05-16

申请人： Takeshi Harasawa ,  Hiroshi Hashimoto ,  Hitoshi Noguchi ,  Shinji Saito

发明人： Takeshi Harasawa ,  Hiroshi Hashimoto ,  Hitoshi Noguchi ,  Shinji Saito

IPC分类号： G11B5708

CPC分类号： G11B5/71 ,  G11B5/708 ,  Y10S428/90 ,  Y10T428/25 ,  Y10T428/265

摘要： The present invention provides a magnetic recording medium having high electromagnetic transfer characteristics in a high-density recording medium. The invention provides a magnetic recording medium, which comprises a nonmagnetic primer layer placed on a nonmagnetic support member and at least one layer of magnetic layers with ferromagnetic powder dispersed in a binder, said magnetic layer being placed on said primer layer, whereby diamond particles with average particle size of 0.05 to 1 &mgr;m are added to the magnetic layer, and at least one type of compound selected from the following genera formulae (1) and (2) is contained: where R1 represents an alkyl group having 1 to 2 carbon atoms; and R2, R3 and R4 each represents a hydrocarbon group having 4 to 21 carbon atoms.

摘要翻译： 本发明提供一种在高密度记录介质中具有高电磁传递特性的磁记录介质。 本发明提供了一种磁记录介质，其包括放置在非磁性支撑构件上的非磁性底漆层和分散在粘合剂中的铁磁粉末的至少一层磁性层，所述磁性层置于所述底漆层上，由此金刚石颗粒与 将平均粒径为0.05〜1μm的粒子添加到磁性层中，并且含有至少一种选自下列通式（1）和（2）的化合物：其中R 1表示具有1至2个碳原子的烷基 ; 并且R 2，R 3和R 4各自表示碳原子数为4〜21的烃基。

公开(公告)号：US06458453B1

公开(公告)日：2002-10-01

申请号：US09557881

申请日：2000-04-25

申请人： Kazuyuki Hayashi ,  Hiroko Morii ,  Mamoru Kamigaki ,  Seiji Ishitani

发明人： Kazuyuki Hayashi ,  Hiroko Morii ,  Mamoru Kamigaki ,  Seiji Ishitani

IPC分类号： G11B5708

CPC分类号： B82Y30/00 ,  C01P2004/03 ,  C01P2004/10 ,  C01P2004/20 ,  C01P2004/32 ,  C01P2004/41 ,  C01P2004/50 ,  C01P2004/51 ,  C01P2004/52 ,  C01P2004/54 ,  C01P2004/62 ,  C01P2004/64 ,  C01P2004/82 ,  C01P2004/86 ,  C01P2006/12 ,  C01P2006/40 ,  C01P2006/42 ,  C01P2006/60 ,  C01P2006/62 ,  C01P2006/80 ,  C09C1/24 ,  C09C3/006 ,  C09C3/12 ,  G11B5/708 ,  Y10T428/25 ,  Y10T428/2982 ,  Y10T428/2991 ,  Y10T428/2995

摘要： A magnetic recording medium composed of a non-magnetic base film and a magnetic recording layer containing a binder resin, magnetic particles, and as a filler black composite hematite particles having an average diameter of 0.08 to 1.0 &mgr;m. The composite particles have cores of hematite particles which are surface coated with an organosilicon compound. A carbon black coating is formed on the organosilicon coating layer. In addition, the hematite core particles may have an oxide or hydroxide coating layer formed on the surface of the hematite core particle, between the organosilicon coating layer and the surface of the core particles. The magnetic recording medium has not only an excellent durability and a good electromagnetic performance, but also a low light transmittance, a small surface resistivity and an excellent surface smoothness.

摘要翻译： 由非磁性基膜和含有粘合剂树脂，磁性颗粒和作为平均直径为0.08至1.0μm的填料黑色复合赤铁矿颗粒的磁记录层组成的磁记录介质。 复合颗粒具有表面涂覆有机硅化合物的赤铁矿颗粒核。 在有机硅涂层上形成炭黑涂层。 此外，赤铁矿芯颗粒可以在赤铁矿核心颗粒的表面，有机硅涂层和芯颗粒的表面之间形成氧化物或氢氧化物涂层。 磁记录介质不仅具有优异的耐久性和良好的电磁性能，而且具有低透光率，小的表面电阻率和优异的表面平滑度。

公开(公告)号：US06821602B2

公开(公告)日：2004-11-23

申请号：US10050857

申请日：2002-01-18

申请人： Shigeo Kurose ,  Akihiko Seki ,  Katsuhiko Yamazaki

发明人： Shigeo Kurose ,  Akihiko Seki ,  Katsuhiko Yamazaki

IPC分类号： G11B5708

CPC分类号： G11B5/842 ,  Y10T428/24975 ,  Y10T428/25 ,  Y10T428/265

摘要： The present invention provides a magnetic recording medium having a thinned magnetic layer, excellent electromagnetic conversion characteristics and an excellent durability, and a process for producing the same. A magnetic recording medium comprising a lower non-magnetic layer containing at least a carbon black and a radiation curing type binder resin on a non-magnetic support and an upper magnetic layer having a thickness of 0.30 &mgr;m or less on the lower non-magnetic layer, wherein the upper magnetic layer contains at least a ferromagnetic powder, a binder resin and an abrasive having a Mohs hardness of 6 or higher and a smaller average particle size than the thickness of the upper magnetic layer. The thickness of the upper magnetic layer is, for example, 0.05 to 0.30 &mgr;m. The average particle size of the abrasive is, for example, 0.01 to 0.2 &mgr;m.

摘要翻译： 本发明提供一种磁记录介质，其具有变薄的磁性层，优异的电磁转换特性和优异的耐久性及其制造方法.1。一种磁记录介质，包括至少含有炭黑和 在非磁性载体上的辐射固化型粘合剂树脂和在下部非磁性层上具有0.30μm或更小的厚度的上部磁性层，其中上部磁性层至少含有铁磁性粉末，粘合剂树脂和研磨剂 莫氏硬度为6以上，平均粒径小于上层磁性层的厚度。 上磁性层的厚度例如为0.05〜0.30μm。 研磨剂的平均粒径例如为0.01〜0.2μm。

公开(公告)号：US06811855B2

公开(公告)日：2004-11-02

申请号：US10430270

申请日：2003-05-07

申请人： Mikio Ohno

发明人： Mikio Ohno

IPC分类号： G11B5708

CPC分类号： G11B5/84 ,  G11B5/7022 ,  G11B5/7085 ,  G11B5/71 ,  Y10T428/25

摘要： A magnetic recording medium is provided which includes a non-magnetic support and a magnetic layer formed on or above the support. The magnetic layer includes a ferromagnetic powder, a binder resin, an abrasive, and a fatty acid ester. The fatty acid ester is a fatty acid alkyl ester compound having an acid hydrolysis rate of 0.030 (1/hr) or less. The abrasive present on the surface of the magnetic layer satisfies the relational expression 0.01≦H15/H10≦0.20 where H10 denotes the number of particles per unit area having a height less than 10 nm (particles/&mgr;m2) and H15 denotes the number of particles per unit area having a height equal to or greater than 15 nm (particles/&mgr;m2).

摘要翻译： 提供了一种磁记录介质，其包括形成在载体上或上的非磁性载体和磁性层。 磁性层包括铁磁性粉末，粘合剂树脂，研磨剂和脂肪酸酯。 脂肪酸酯是酸水解率为0.030（1 / hr）以下的脂肪酸烷基酯化合物。 存在于磁性层表面上的磨料满足关系式，其中H10表示高度小于10nm（颗粒/母体2）的每单位面积的颗粒数，H15表示每单位面积的颗粒数 高度等于或大于15nm（颗粒/ mum 2）。

公开(公告)号：US06686022B2

公开(公告)日：2004-02-03

申请号：US09990610

申请日：2001-11-21

申请人： Hiroaki Takano ,  Masaki Suzuki ,  Masanosuke Kunikata

发明人： Hiroaki Takano ,  Masaki Suzuki ,  Masanosuke Kunikata

IPC分类号： G11B5708

CPC分类号： G11B5/70678 ,  G11B5/7085 ,  Y10T428/24975 ,  Y10T428/25 ,  Y10T428/256 ,  Y10T428/257 ,  Y10T428/265

摘要： Provided is a particulate magnetic recording medium with good output at high frequency, yielding a low coefficient of friction, and having good running properties, in particular, a magnetic recording medium affording good electromagnetic characteristics and good repeat durability in recording and reproducing at a high-density. The magnetic recording medium comprises a lower layer comprising a nonmagnetic powder and a binder and an upper magnetic layer comprising a ferromagnetic powder, a binder and at least one abrasives provided on a nonmagnetic support in this order. The number of abrasive particles present on said magnetic layer surface satisfied the relation 0.2≦X≦1.2 (particles/&mgr;m2). When the number of pairs of abrasive particles satisfying the relation L≦2K (where K denotes the mean particle diameter of the abrasive and L denotes the distance from the center of gravity of one of the abrasive particles to the center of gravity of the other abrasive particle) is denoted as Y (particles/&mgr;m2), Y/X is equal to or less than 2.

摘要翻译： 本发明提供一种具有良好的高频输出的微粒磁记录介质，产生低摩擦系数，并且具有良好的运行特性，特别是在高速记录和再现时具有良好的电磁特性和良好的重复耐久性的磁记录介质， 密度。 磁记录介质包括下层，其包含非磁性粉末和粘合剂，以及上层磁性层，其包含铁磁性粉末，粘合剂和至少一种按照这种顺序设置在非磁性载体上的研磨剂。 存在于所述磁性层表面上的磨料颗粒的数量满足关系0.2 <= X <= 1.2（颗粒/母体2）。 当满足关系L <= 2K（其中K表示研磨剂的平均粒径）和L表示从研磨颗粒之一的重心到另一个的重心的距离的磨粒的数目 磨料颗粒）表示为Y（颗粒/ mum 2），Y / X等于或小于2。

公开(公告)号：US06703107B2

公开(公告)日：2004-03-09

申请号：US10156807

申请日：2002-05-30

申请人： Masatoshi Takahashi ,  Hiroaki Doushita

发明人： Masatoshi Takahashi ,  Hiroaki Doushita

IPC分类号： G11B5708

CPC分类号： G11B5/78 ,  G11B5/00813 ,  G11B5/70 ,  G11B5/7085 ,  Y10T428/24942 ,  Y10T428/25 ,  Y10T428/265 ,  Y10T428/31786

摘要： A magnetic tape is disclosed, comprising a non-magnetic support having provided on one face thereof a substantially non-magnetic layer containing a non-magnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder, in this order, and having provided on the other face thereof a back coat layer containing carbon black, wherein 16 projections/mm2 or less of projections having an area of 30 &mgr;m2 or more and a height of 40 nm or more exist on a surface of the magnetic layer.

摘要翻译： 公开了一种磁带，其包括非磁性支撑件，该非磁性支撑件在其一个表面上依次设置有包含非磁性粉末和粘合剂的基本非磁性层和含有铁磁粉末和粘合剂的磁性层，以及 在其另一面上设置有含有炭黑的背涂层，其中在表面上存在16个/ mm 2以下的面积为30m 2以上且高度为40nm以上的突起/ mm 2以下的突起 的磁性层。

公开(公告)号：US06582815B2

公开(公告)日：2003-06-24

申请号：US10081093

申请日：2002-02-21

申请人： Koji Naoe ,  Kiyomi Ejiri

发明人： Koji Naoe ,  Kiyomi Ejiri

IPC分类号： G11B5708

CPC分类号： G11B5/708 ,  G11B5/714 ,  G11B5/842 ,  Y10T428/1164 ,  Y10T428/256 ,  Y10T428/265

摘要： Provided is a magnetic recording medium suitable for high density digital recording, in detail, a magnetic recording medium suitable for reproduction with an MR head. A magnetic recording medium comprising a nonmagnetic layer comprising a nonmagnetic powder and a binder and a magnetic layer comprising a ferromagnetic metal powder, a binder and a nonmagnetic powder provided in this order on a flexible nonmagnetic support. Said magnetic layer has an average thickness ranging from 0.01 to 0.2 &mgr;m, said ferromagnetic metal powder has a mean major axis length of less than 100 nm and a mean minor axis length of less than 20 nm, said nonmagnetic powder comprised in the magnetic layer is a granular or acicular nonmagnetic powder, the ratio of the mean particle size or minor axis length of said nonmagnetic powder to said mean minor axis length is higher than 0.2 and equal to or less than 2.5, and the maximum surface area of magnetic pinholes is equal to or less than 50% of a bit surface area.

公开(公告)号：US06576322B2

公开(公告)日：2003-06-10

申请号：US09997871

申请日：2001-11-29

申请人： Shinji Saito ,  Takeshi Kakuta

发明人： Shinji Saito ,  Takeshi Kakuta

IPC分类号： G11B5708

CPC分类号： B82Y15/00 ,  G11B5/70 ,  Y10T428/24355 ,  Y10T428/24975 ,  Y10T428/25

摘要： A magnetic disk comprises a support, a substantially non-magnetic lower layer, and a magnetic layer containing at least one of a ferromagnetic metal powder and a hexagonal ferrite powder and a binder, wherein the magnetic layer has a thickness of 0.02 &mgr;m to 0.5 &mgr;m, a surface having a ten-point mean height Rz measured by a non-contact surface roughness profiler of 20 nm to 50 nm, and a number of projections having a height of at least 20 nm measured by AFM of 1×105/mm2 to 2×106/mm2.