Patent ID: 6344257
Filing Date: 2002-02-05
Classification: G11B,Y10S,Y10T

Abstract:
An aromatic polyamide film for a high-density magnetic recording medium, which comprises:(A) a biaxially oriented aromatic polyamide base film of an aromatic polyamide containing substantially no inert fine particles and having a total of Young's moduli in two directions crossing at right angles each other on the film plane, of at least 2,000 kg/mm2; and (B) a coating layer comprising inert fine particles having an average particle diameter of 5 to 100 nm and a binder resin and formed on at least one side of the base film, the average particle diameter (dB: nm) of the inert fine particles and the thickness (tB: nm) of the coating layer satisfying the following expression (1): 0.05&lE;tB/dB&lE;0.8â€ƒâ€ƒ(1) and the coating layer having protrusions on its surface at a density of 1Ã—106 to 1Ã—108/ mm2.