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1. 发明公开

EP1073041A1 Magnetic recording medium 审中-公开
标题翻译：磁记录介质
公开(公告)号：EP1073041A1
公开(公告)日：2001-01-31
申请号：EP00306445.8
申请日：2000-07-28
申请人： TDK Corporation
发明人： Sasaki, Hideki , Uchida, Masatoshi
IPC分类号： G11B5/708 , G11B5/718
CPC分类号： G11B5/7085 , G11B5/718
摘要： A magnetic recording medium, a magnetic layer being formed on a non-magnetic support after coating and drying thereon a binder-containing non-magnetic layer and the film thickness of the magnetic layer being no greater than 0.5 µm, wherein the Mohs hardness of the abrasive in the magnetic layer is 5 or greater, the relative polishing speed is at least 200, and at the same time the value (A) obtained by relational expression (1) between the abrasive mean particle size (D) and the magnetic layer thickness (T) is between 0.55 and 1.20. A = D/T (1). According to the invention it is possible to achieve a flexible disk-shaped magnetic recording medium with a rotation rate of at least 700 rpm for recording and playback of the medium, the magnetic recording medium also exhibiting excellent running durability and running performance, as well as high electromagnetic induction characteristics.
摘要翻译：一种磁记录介质，在其上涂覆和干燥含粘合剂的非磁性层之后，在非磁性支撑体上形成磁性层，并且该磁性层的膜厚度不大于0.5μm，其中该磁性层的莫氏硬度研磨平均粒径（D）与磁性层厚度（D）之间的关系式（1）得到的值（A）为5以上，相对研磨速度为200以上，（T）在0.55和1.20之间。 A = D / T（1）。根据本发明，可以实现具有至少700rpm的旋转速率的用于记录和重放介质的柔性盘形磁记录介质，该磁记录介质也具有优异的运行耐久性和运行性能，以及高电磁感应特性。

2. 发明公开

EP0982714A1 Magnetic Disk 审中-公开
标题翻译： Magnetplatte
公开(公告)号：EP0982714A1
公开(公告)日：2000-03-01
申请号：EP99116701.6
申请日：1999-08-25
申请人： TDK Corporation
发明人： Sasaki, Hideki , Nagashima, Naoyuki , Uchida, Masatoshi
IPC分类号： G11B5/71 , G11B5/738
CPC分类号： G11B5/738 , G11B5/71
摘要： A magnetic disk (1) of the present invention has a magnetic layer (31) via a non-magnetic underlayer (21) on a flexible non-magnetic support (10), wherein the magnetic layer and the non-magnetic underlayer do not include any fatty acid as a lubricant; the non-magnetic underlayer includes carbon black as a non-magnetic powder and a fatty ester A represented by a specific structural formula in which an alcohol component is an iso-compound and a fatty ester B represented by a specific structural formula comprising a lower alcohol with 5 or less carbon atoms as the lubricants; the contents of the fatty ester A and the fatty ester B, and a BET method and the content of carbon black are set in predetermined ranges, respectively, whereby the clogging of a head can be prevented, sticking does not occur, and durability can be remarkably improved.
摘要翻译：本发明的磁盘（1）在柔性非磁性支撑（10）上经由非磁性底层（21）具有磁性层（31），其中磁性层和非磁性底层不包括任何脂肪酸作为润滑剂; 非磁性底层包括作为非磁性粉末的炭黑和由特定结构式表示的脂肪酯A，其中醇组分是异构化合物，和脂肪酯B由特定结构式表示，其包含低级醇具有5个或更少的碳原子作为润滑剂; 脂肪酯A和脂肪酯B的含量以及BET法和炭黑的含量分别设定在预定范围内，从而可以防止头部的堵塞，不会发生粘附，耐久性可以显着改善。

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