Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

2006-05-09

2006-05-09

Resan, Stevan A. (Department: 1773)

Stock material or miscellaneous articles

Magnetic recording component or stock

Binder media

C428S844000

Reexamination Certificate

active

07041396

ABSTRACT:
Provided is a magnetic recording medium affording good head contact and high output in addition to excellent head abrasion characteristics acceptable to high data transmission rates. The magnetic recording medium comprises a nonmagnetic layer comprising a nonmagnetic powder and a binder and a magnetic layer comprising a ferromagnetic powder and a binder in this order on a support. Said magnetic layer comprises an abrasive in a quantity of 2 to 5 weight percent with respect to the ferromagnetic powder, the number of protrusions having a height of 3 to 7 nm per 23,000 μm2of a surface of the magnetic layer, measured by a non-contact three-dimensional structure analyzing microscope, ranges from 50 to 200, and said magnetic layer has a microindentation hardness ranging from 40 to 80 kg/mm2at a load of 6 mgf.

REFERENCES:
patent: 6652953 (2003-11-01), Komatsu et al.
patent: 6805942 (2004-10-01), Doushita et al.
patent: 6821602 (2004-11-01), Kurose et al.

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