Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

2007-09-04

2007-09-04

Rickman, Holly (Department: 1773)

Stock material or miscellaneous articles

Magnetic recording component or stock

Binder media

C428S840600, C427S131000

Reexamination Certificate

active

10835184

ABSTRACT:
The invention provides a magnetic recording medium comprising a support having provided thereon a nonmagnetic layer containing a nonmagnetic powder, and a magnetic layer containing a ferromagnetic powder formed on the nonmagnetic layer after coating and drying thereof, wherein the ferromagnetic layer is a hexagonal ferrite powder having an average tabular diameter of 15 to 40 nm or a ferromagnetic metal powder having an average major axis length of 25 to 100 nm, the thickness of the magnetic layer is from 0.01 to 0.3 μm, the thickness of the nonmagnetic layer is from 0.5 to 5 μm, and the specific surface area and the total pore volume of the magnetic recording medium itself measured by a nitrogen absorption measured method are from 0.1 to 50 m2/g and from 0.001 to 1 ml/g, respectively, thereby being to provide the magnetic recording medium for high density recording remarkably improved in electromagnetic characteristics, particularly in high density recording characteristics.

REFERENCES:
patent: 5766763 (1998-06-01), Kurisu et al.
patent: 6713149 (2004-03-01), Harasawa et al.
patent: 2002/0064686 (2002-05-01), Araki et al.
patent: 2003-30813 (2003-01-01), None

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