Patent ID: 6468628
Filing Date: 2002-10-22
Classification: G11B,Y10T

Abstract:
A magnetic recording medium having a magnetic layer directly formed on at least one surface of a base film that comprises, as the essential ingredient, an aromatic polyamide, in which the number of protrusions having a height of at least 10 nm on the surface of the magnetic layer, Na(10) (/mm2), the number of protrusions having a height of at least 50 nm thereon, Na(50) (/mm2), and the number of protrusions having a height of at least 10 nm on the surface of the base film coated with the magnetic layer, Na(10)â€² (/mm2), all satisfy the following formulae:2Ã—104&lE;Na(10)&lE;2Ã—107, 0&lE;Na(50)&lE;5Ã—104, âˆ’0.9&lE;(Na(10)âˆ’Na(10)â€²)/Na(10)â€²&lE;0.