Magnetic recording medium comprising a mixed magnetic region hav

Details Magnetic recording medium comprising a mixed magnetic region hav Magnetic recording medium comprising a mixed magnetic region hav

1998-08-06

2000-05-16

Le, Hoa T.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

428329, 428336, 428693, 428694BA, 428694BM, 428694BN, 428699, 428701, 428702, B32B 516

Patent

active

060634898

ABSTRACT:
A magnetic recording medium having a lower magnetic layer 3 and an upper magnetic layer 4 is disclosed, wherein the lower magnetic layer 3 contains tabular magnetic particles and acicular nonmagnetic inorganic particles and has a thickness of 0.5 to 2.5 .mu.m, the tabular magnetic particles being oriented with their plane having the longest diameter tilted at an angle of 70 to 90.degree. in average with the plane of the magnetic recording medium, the upper magnetic layer 4 contains acicular magnetic particles and has a thickness of not greater than 0.3 .mu.m, and a mixed magnetic region 6 which comprises tabular magnetic particles and acicular magnetic particles, mixed together, and formed between the upper and lower magnetic layers, a thickness m of the mixed magnetic region 6 being 1 to 20% of the total thickness T of all the magnetic layers.

REFERENCES:
patent: 4784895 (1988-11-01), Mizuno et al.
patent: 5384182 (1995-01-01), Ito et al.
patent: 5494732 (1996-02-01), Ito et al.
patent: 5547772 (1996-08-01), Saito et al.
patent: 5827600 (1998-10-01), Ejiri et al.

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