Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1998-09-10

2000-08-15

Resan, Stevan A.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

428216, 428323, 428328, 428694BM, 428694BR, 428900, G11B 570

Patent

active

061033405

ABSTRACT:
A magnetic recording medium comprising a nonmagnetic substrate having provided thereon an intermediate layer consisting essentially of magnetic powder having a Mohs hardness of not less than 3 and an average particle size of not greater than 0.5 .mu.m and/or nonmagnetic powder having a Mohs hardness of not less than 3, carbon black, and a binder and, as a top layer, a magnetic layer consisting essentially of ferromagnetic metal powder and a binder, in which said magnetic layer has an average center-line surface roughness (Ra) of not greater than 7 nm, and said magnetic layer has an average center-line surface roughness (Ra) of 10 to 30 nm after being immersed in a hydrochloric acid aqueous solution for 24 hours.

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