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    Magnetic recording medium having a specified thickness relationship between a nonmagnetic underlayer and overcoated magnetic layers
    1.
    发明授权
    Magnetic recording medium having a specified thickness relationship between a nonmagnetic underlayer and overcoated magnetic layers 失效
    在非磁性底层和外涂磁性层之间具有特定厚度关系的磁记录介质

    公开(公告)号：US5447782A

    公开(公告)日：1995-09-05

    申请号：US143063

    申请日：1993-10-29

    申请人： Hiroo Inaba ,  Kiyomi Ejiri ,  Koji Naoe

    发明人： Hiroo Inaba ,  Kiyomi Ejiri ,  Koji Naoe

    IPC分类号： C09D5/23 ,  G11B5/70 ,  G11B5/716 ,  G11B5/73 ,  G11B5/738 ,  G11B5/00

    CPC分类号： G11B5/70 ,  G11B5/716 ,  G11B5/738 ,  Y10S428/90 ,  Y10T428/24942 ,  Y10T428/2495 ,  Y10T428/24967 ,  Y10T428/256 ,  Y10T428/257

    摘要： Disclosed is a magnetic recording medium, comprising (a) a nonmagnetic flexible support, (b) a lower nonmagnetic layer provided on the support and comprising a nonmagnetic particle and a binder, and (c) a magnetic layer provided on the nonmagnetic layer and comprising a ferromagnetic particle and a binder, wherein (i) the magnetic layer comprises at least two layers comprising a lower magnetic layer provided on the lower nonmagnetic layer and an upper magnetic layer provided on the lower magnetic layer, (ii) a ratio of the lower nonmagnetic layer thickness to the total magnetic layer thickness of the lower magnetic layer and the upper magnetic layer is from 1 to 50, (iii) the upper magnetic layer and the lower magnetic layer have a difference in coercive force of at least 80 Oe, and (iv) the lower nonmagnetic layer and at least the lower magnetic layer are formed by a wet-on-wet coating method.

    摘要翻译： 公开了一种磁记录介质，包括（a）非磁性柔性支撑体，（b）设置在载体上的下部非磁性层，并且包括非磁性颗粒和粘合剂，和（c）设置在非磁性层上的磁性层， 铁磁颗粒和粘合剂，其中（i）磁性层包括至少两层，包括设置在下部非磁性层上的下部磁性层和设置在下部磁性层上的上部磁性层，（ii）下部磁性层的比例 非磁性层厚度与下部磁性层和上部磁性层的总磁性层厚度的比值为1〜50，（iii）上部磁性层和下部磁性层的矫顽力差异至少为80 Oe， （iv）下部非磁性层和至少下部磁性层通过湿式湿式涂覆法形成。

    Magnetic recording medium
    2.
    发明授权
    Magnetic recording medium 失效
    磁记录介质

    公开(公告)号：US6074724A

    公开(公告)日：2000-06-13

    申请号：US918864

    申请日：1997-08-26

    申请人： Hiroo Inaba ,  Kiyomi Ejiri ,  Masaki Suzuki ,  Koji Naoe ,  Yuichiro Murayama ,  Hiroaki Takano

    发明人： Hiroo Inaba ,  Kiyomi Ejiri ,  Masaki Suzuki ,  Koji Naoe ,  Yuichiro Murayama ,  Hiroaki Takano

    IPC分类号： G11B5/702 ,  G11B5/706

    CPC分类号： B82Y15/00 ,  G11B5/7021 ,  G11B5/7022 ,  G11B5/70621 ,  Y10S428/90 ,  Y10T428/24355 ,  Y10T428/25 ,  Y10T428/257 ,  Y10T428/265

    摘要： A magnetic recording medium is disclosed, which comprises a support having thereon a magnetic layer comprising a binder and a ferromagnetic powder dispersed therein, wherein said binder comprises a polyurethane resin having at least one cyclic hydrocarbon group and at least one ether linkage, and said ferromagnetic powder is a ferromagnetic metallic powder which comprises Fe and has a mean major-axis length of from 0.05 to 0.19 .mu.m and a crystallite size of from 100 to 230 .ANG.; and further a magnetic recording medium is disclosed, comprising a support having thereon in succession an undercoat layer comprising a binder U and an inorganic powder dispersed therein and a magnetic layer comprising a binder M and a ferromagnetic powder dispersed therein, wherein at least either of the binder U or M comprises a polyurethane resin having at least one cyclic hydrocarbon group and at least one ether linkage and said ferromagnetic powder is a ferromagnetic metallic powder which comprises Fe and has a mean major-axis length of from 0.05 to 0.19 .mu.m and a crystallite size of from 100 to 230 .ANG..

    摘要翻译： 公开了一种磁记录介质，其包括其上具有包含粘合剂和分散在其中的铁磁粉末的磁性层的载体，其中所述粘合剂包含具有至少一个环状烃基和至少一个醚键的聚氨酯树脂，并且所述铁磁性 粉末是含铁的铁磁性金属粉末，其平均长轴长度为0.05至0.19μm，微晶尺寸为100至230安培; 并且还公开了一种磁记录介质，包括其上连续地具有包含粘合剂U和分散在其中的无机粉末的底涂层的支撑体和包含粘合剂M和分散在其中的铁磁性粉末的磁性层，其中， 粘合剂U或M包含具有至少一个环状烃基和至少一个醚键的聚氨酯树脂，并且所述铁磁性粉末是包含Fe并且具有0.05至0.19μm的平均长轴长度的铁磁性金属粉末，以及 微晶尺寸为100至230安培。

    Magnetic recording medium
    6.
    发明授权
    Magnetic recording medium 失效
    磁记录介质

    公开(公告)号：US5455112A

    公开(公告)日：1995-10-03

    申请号：US10846

    申请日：1993-01-29

    申请人： Hiroo Inaba ,  Kiyomi Ejiri

    发明人： Hiroo Inaba ,  Kiyomi Ejiri

    IPC分类号： C09C1/48 ,  C09D5/23 ,  C09D7/12 ,  G11B5/73 ,  G11B5/733 ,  G11B5/738 ,  B32B5/16 ,  G11B5/66

    CPC分类号： G11B5/738 ,  G11B5/733 ,  Y10S428/90 ,  Y10S428/928 ,  Y10T428/25 ,  Y10T428/256 ,  Y10T428/257 ,  Y10T428/259 ,  Y10T428/26 ,  Y10T428/265

    摘要： A magnetic recording medium produced by providing a lower non-magnetic layer comprising a non-magnetic powder dispersed in a binder on a non-magnetic support followed by providing, while the lower non-magnetic layer is still wet, an upper magnetic layer comprising a ferromagnetic powder dispersed in a binder on the lower non-magnetic layer, wherein a mean thickness of the upper magnetic layer is 1.0 .mu.m or less and the non-magnetic powder in the lower non-magnetic layer comprises (A) a granular inorganic powder having a mean particle size of from 0.01 to 0.08 .mu.m, (B) a carbon black powder having a mean particle size of from 0.01 to 0.04 .mu.m and (C) a powder component having a larger mean particle size than the mean particle size of each of powders (A) and (B). The magnetic recording medium has good electromagnetic characteristics and has excellent running durability with little edge damage after repeated running.

    摘要翻译： 提供一种磁记录介质，其通过在非磁性载体上提供分散在粘合剂中的非磁性粉末的下部非磁性层，然后在下部非磁性层仍然是湿的同时提供包括 分散在下层非磁性层上的粘合剂中的铁磁性粉末，其中上磁性层的平均厚度为1.0μm以下，下部非磁性层中的非磁性粉末包含（A）粒状无机粉末 平均粒径为0.01〜0.08μm，（B）平均粒径为0.01〜0.04μm的炭黑粉末，（C）平均粒径大于平均粒径的粉末成分 的粉末（A）和（B）。 磁记录介质具有良好的电磁特性，具有优异的运行耐久性，反复运行后边缘损伤小。