Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

2006-06-13

2006-06-13

Kiliman, Leszek (Department: 1773)

Stock material or miscellaneous articles

Structurally defined web or sheet

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

C428S212000, C428S336000, C428S690000, C428S690000, C428S690000, C428S690000, C428S425900

Reexamination Certificate

active

07060340

ABSTRACT:
A magnetic recording medium having a non-magnetic support, at least one primer layer on one surface of the support, a magnetic layer on the primer layer and a back coat layer on the other surface of the non-magnetic support, in which the support has a thickness of 2 to 5 μm, the surface roughness (Ra) of the support on its surface carrying the primer layer and the magnetic layer is from 2.5 nm to 20 nm, the thickness of the primer layer is 1.5 μm or less, and the primer layer contains 2 to 30% by weight, based on the weight of all inorganic powder in the primer layer, of alumina powder having a particle size of 0.01 μm to 0.1 μm.

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Standard ECMA (Standardizing Information and Communication Systems)—288, Jun. 1999, pp. 29 and 30.

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