Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1996-08-09

1998-08-04

Rodee, Christopher D.

Stock material or miscellaneous articles

Structurally defined web or sheet

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

428323, 428328, 428336, 428694BA, 428394TR, G11B 5706

Patent

active

057890633

ABSTRACT:
A magnetic recording medium comprising a support and a magnetic layer comprising a ferromagnetic metal powder and a binder formed on said support, wherein the magnetic layer has a surface roughness of 10 nm or smaller, a coercive force of 1,580 Oe or greater and a decreasing ratio .DELTA.Bs of a saturation flux density (a change rate of saturation flux density Bs' of the magnetic layer realized after the magnetic recording medium has been allowed to stand in an environment, the temperature of which is 60.degree. C. and the relative humidity of which is 90% for 30 days, as compared with saturation flux density Bs of the magnetic layer before the magnetic recording medium is allowed to stand, the change rate being a value expressed by an equation .DELTA.Bs=(1-Bs'/Bs).times.100) of 10% or lower.

REFERENCES:
patent: 4275114 (1981-06-01), Schoenafinger et al.
patent: 4379809 (1983-04-01), Matsufuji et al.
patent: 4444850 (1984-04-01), Matsufuji et al.
patent: 4970124 (1990-11-01), Oltean et al.
patent: 5260132 (1993-11-01), Nakazumi et al.
patent: 5449565 (1995-09-01), Aoki et al.

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