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    • 33. 发明授权
    • Aromatic polyamide film, method of manufacturing the same and magnetic
recording medium using the same film
    • 芳香聚酰胺薄膜,其制造方法和使用相同薄膜的磁记录介质
    • US5993938A
    • 1999-11-30
    • US981339
    • 1998-01-20
    • Akimitsu TsukudaMitsuhiro HoriuchiToshihiro Tsuzuki
    • Akimitsu TsukudaMitsuhiro HoriuchiToshihiro Tsuzuki
    • B29D7/01C08J5/18G11B5/73G11B5/733G11B5/704
    • G11B5/733B29D7/01C08J5/18B29K2077/10B29K2105/16C08J2377/10Y10S428/90Y10T428/24355Y10T428/25Y10T428/31725Y10T428/31728
    • The present invention relates to aromatic polyamide film which is characterized in that on at least one face thereof the number of projections of height at least 20 nm but less than 50 nm is from 10.sup.3 to 10.sup.8 per mm.sup.2, and the number of projections of height at least 50 nm but less than 100 nm is from 0 to 3.times.10.sup.4 per mm.sup.2.Further, the present invention also offers a method of producing an aromatic polyamide film which is characterized in that, in a method of producing aromatic polyamide film from a solution obtained by adding to an aromatic polyamide solution a particle-containing slurry formed by dispersing particles of particle diameter 10 to 300 nm in a liquid medium of 10 poise or less, such that the amount of said particles added in terms of the aromatic polyamide is 0.005 to 4.5 wt %, the relative standard deviation in the diameters of said particles is no more than 0.8 and, furthermore, there is used a particle-containing slurry where the initial filterability index Q1 of said particle-containing slurry and the filterability index Q2 after the passage of 500 ml of liquid satisfy the following relation.Q2/Q1.gtoreq.0.3While the film of the present invention is also ideal for use as flexible printed substrates, capacitors and printer ribbons, etc, since it is possible to realise extremely high levels of both output characteristics and durability, it is especially suitable for magnetic recording media, in particular for computer external memory and digital video tape where high density and high precision are demanded.
    • PCT No.PCT / JP97 / 01336 Sec。 371日期1998年1月20日 102(e)1998年1月20日PCT PCT 1997年4月17日PCT公布。 公开号WO97 / 39876 日期:1997年10月30日本发明涉及芳族聚酰胺薄膜,其特征在于,在至少一个面上,高度至少为20nm但小于50nm的突起数为103〜108个/ mm 2, 高度至少为50nm但小于100nm的突起为0至3×10 4 / mm 2。 此外,本发明还提供了一种芳族聚酰胺薄膜的制造方法,其特征在于,在通过向芳香族聚酰胺溶液中添加由通过将芳香族聚酰胺薄膜分散 在10泊或更低的液体介质中的粒径为10至300nm,使得以芳族聚酰胺计的所述颗粒的量为0.005至4.5重量%,所述颗粒的直径的相对标准偏差不再 0.8以上,此外,使用含有颗粒的浆料的初始过滤性指数Q1和500ml液体通过后的过滤性指数Q2满足以下关系的含有颗粒的浆料。 Q2 / Q1> / = 0.3本发明的薄膜也是理想的用作柔性印刷基板,电容器和打印机色带等,因为可以实现极高的输出特性和耐久性,所以特别是 适用于磁记录介质,特别适用于需要高密度和高精度的计算机外部存储器和数字录像带。