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    • 6. 发明授权
    • Laminated film and magnetic recording medium made therewith
    • 层压膜和由其制成的磁记录介质
    • US4568599A
    • 1986-02-04
    • US473448
    • 1983-03-09
    • Masaaki OnoYasuki MiuraMasahiko MotegiKazuo Okabe
    • Masaaki OnoYasuki MiuraMasahiko MotegiKazuo Okabe
    • G11B5/64G11B5/72
    • G11B5/64Y10S428/90Y10T428/24355Y10T428/24388Y10T428/24405Y10T428/24421Y10T428/24446Y10T428/24851Y10T428/31663Y10T428/31786Y10T428/31797Y10T428/31801
    • A laminated film for a super-high density magnetic recording medium, which comprises (A) a layer composed of a thermoplastic resin and (B) a layer of a thermoplastic resin containing fine particles therein. In this laminated film, the outer surface of the layer (A) has a surface roughness of less than 0.005.mu. as expressed as the Ra value, and the outer surface of the layer (B) has a surface roughness of 0.005 to 0.040.mu. as expressed as the Ra value. The outer surface of the layer (B) has either (i) a plurality of depressions and a plurality of protrusions, which are formed thereon in a configuration such that at least one protrusion exists within each depression or at least one protrusion exists in the area where two or more depressions are contiguous to each other, or (ii) protrusions on a flat plane and a covering layer (C) composed of a lubricant, which is formed on the surface of the layer (B). This covering layer (C) may be formed on the surface having the above-mentioned depressions and protrusions. The covering layer (C) is a continuous film layer or a discontinuous film layer formed of worm-like nodules. When a ferromagnetic metal thin film is formed on the surface of the layer (A) by vacuum evaporation and a protective film layer is formed on this thin film, there is obtained a vacuum-deposited video tape excellent in running properties and electromagnetic transformation performance. In this vacuum-deposited video tape, the transfer of the surface configuration due to the coarseness of the running surface can be prevented.
    • 一种用于超高密度磁记录介质的叠层膜,其包含(A)由热塑性树脂构成的层和(B)含有微粒的热塑性树脂层。 在该层压膜中,层(A)的外表面的表面粗糙度表示为Ra值小于0.005μm,层(B)的外表面的表面粗糙度为0.005〜0.040μm, 表示为Ra值。 层(B)的外表面具有(i)多个凹部和多个突起,其形成在其上,使得在每个凹部内存在至少一个突起,或者在该区域中存在至少一个突起 其中两个或更多个凹陷彼此邻接,或(ii)平坦平面上的突起和由形成在层(B)的表面上的润滑剂构成的覆盖层(C)。 该覆盖层(C)可以形成在具有上述凹陷和突起的表面上。 覆盖层(C)是由蠕虫状结节形成的连续膜层或不连续膜层。 当通过真空蒸发在层(A)的表面上形成铁磁性金属薄膜并在该薄膜上形成保护膜层时,获得了运行性能和电磁转换性能优异的真空沉积磁带。 在这种真空沉积的录像带中,可以防止由于行驶表面的粗糙度导致的表面形状的传递。