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    • 8. 发明授权
    • Magnetic recording medium
    • 磁记录介质
    • US4663209A
    • 1987-05-05
    • US724231
    • 1985-04-17
    • Masashi AonumaMasaaki SuzukiSatoshi SakakibaraNoburo HibinoKoh Kamada
    • Masashi AonumaMasaaki SuzukiSatoshi SakakibaraNoburo HibinoKoh Kamada
    • G11B5/70C09D5/23C09D127/04C09D127/06C09D175/06G11B5/714G11B5/73G11B5/704
    • G11B5/7305G11B5/714Y10S428/90Y10T428/24355Y10T428/31786
    • Magnetic recording medium is disclosed which comprises a non-magnetic support having coated thereon a magnetic layer mainly containing ferromagnetic metal particles and a binder:(1) wherein the non-magnetic support is a polyester film having a thickness of 4 to 12 .mu.m, (b) an F5 value in a machine direction of 16 kg/mm.sup.2 or more, (c) a breaking strength in a machine direction of 25 kg/mm.sup.2 or more, (d) a breaking elongation in a machine direction of 90% or less, (e) a surface roughness (Ra) of 0.01 to 0.03 .mu.m, and (f) a fish eye (FE), which is shown in terms of height (H), of 6H or more having 0 per 100 cm.sup.2, a fish eye of 5H having 2 or less per 100 cm.sup.2 and a fish eye of 4H having 5 or less per 100 cm.sup.2 ;(2) wherein the ferromagnetic metal particles have (a) a saturation magnetization (.sigma.s) of 110 to 160 emu/g, and (b) a specific surface area measured by the BET method of 25 to 65 m.sup.2 /g; and(3) wherein the magnetic layer has (a) a coercive force (Hc) of 700 Oe or more, (b) a surface roughness (Ra) of 0.015 .mu.m or less and (c) a thickness of 1.5 to 4.5 .mu.m.
    • 公开了一种磁记录介质,其包括其上涂覆有主要包含铁磁性金属颗粒和粘合剂的磁性层的非磁性载体:(1)其中非磁性载体为厚度为4至12μm的聚酯膜, (b)机器方向的F5值为16kg / mm 2以上,(c)机器方向的断裂强度为25kg / mm 2以上,(d)机器方向的断裂伸长率为90%, (e)表面粗糙度(Ra)为0.01〜0.03μm,(f)以高度(H)表示的每100cm 2为0以上的6H以上的鱼眼(FE) 5H的鱼眼每100cm 2具有2个或更少的鱼眼,4H的鱼眼具有每100cm 2具有5个或更少的鱼眼; (2)其中铁磁金属颗粒具有(a)110至160emu / g的饱和磁化强度(σ),和(b)通过BET法测量的比表面积为25至65m 2 / g; 和(3)其中磁性层具有(a)700Oe以上的矫顽力(Hc),(b)0.015μm以下的表面粗糙度(Ra)和(c)1.5〜4.5μm的厚度 m。
    • 10. 发明授权
    • Magnetic recording medium
    • 磁记录介质
    • US5340636A
    • 1994-08-23
    • US974696
    • 1992-11-12
    • Koh Kamada
    • Koh Kamada
    • G11B5/714C08J5/18C09D5/23C09D7/12G11B5/716G11B5/73B32B3/10B32B5/16G11B5/66
    • G11B5/714G11B5/7305Y10S428/90Y10T428/24355Y10T428/257Y10T428/31786
    • A magnetic recording medium comprising a non-magnetic support having on at least one side thereof at least one magnetic layer, in which the magnetic layer comprises a binder having dispersed therein a ferromagnetic powder and the non-magnetic support has a coarse projection density of not more than 400 per 500 mm.sup.2, a surface roughness (Ra) of from 0.02 to 0.07 .mu.m (cut-off value: 0.25 mm), and a thermal shrinkage of not more than 1.0% when preserved at 100.degree. C. for 4 hours. The magnetic recording medium has satisfactory sensitivity and frequency characteristics, freedom from output variation in the high-frequency region, and excellent running properties at ordinarily temperature and ordinary humidity with a reduced rate of running stop.
    • 一种磁记录介质,包括在其至少一个侧面上具有至少一个磁性层的非磁性载体,其中所述磁性层包括其中分散有铁磁性粉末的粘合剂,并且所述非磁性载体具有不粗糙的突出密度 400个/ 500mm 2,表面粗糙度(Ra)为0.02〜0.07μm(截止值:0.25mm),当在100℃下保存4小时时的热收缩率不大于1.0% 。 磁记录介质具有令人满意的灵敏度和频率特性,无频率区域的输出变化,并且在通常的温度和普通湿度下具有降低的停止运行速度的优异的运行特性。