Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1995-04-04

1996-08-20

Kiliman, Leszek

Stock material or miscellaneous articles

Composite

Of inorganic material

428141, 428323, 428329, 428336, 428694BR, 428694BA, 428694BM, 428900, G11B 566, B32B 310, B32B 516

Patent

active

055477720

ABSTRACT:
The present invention is directed to a magnetic recording medium comprising a non-magnetic support having provided thereon a plurality of magnetic layers composed of a lower magnetic layer comprising a ferromagnetic powder and a binder, and an upper magnetic layer comprising a ferromagnetic powder being provided on the lower magnetic layer, wherein the ferromagnetic powder contained in the upper magnetic layer has a length of major axis not longer than 0.30 .mu.m and a crystallite size not larger than 400 .ANG., the upper magnetic layer has a dry thickness of not more than 1.20 .mu.m, and the surface of the upper magnetic layer has a center-line average surface roughness (Ra) not more than 0.015 .mu.m.

REFERENCES:
patent: 4410590 (1983-10-01), Kawahara et al.
patent: 4439795 (1984-03-01), Kitamoto et al.
patent: 4784895 (1988-11-01), Mizuno et al.
patent: 4851289 (1989-07-01), Ogawa et al.
patent: 4946374 (1990-08-01), Yamaguchi et al.
patent: 4980230 (1990-12-01), Saito et al.
patent: 5051291 (1991-09-01), Kawahara
patent: 5051303 (1991-09-01), Noguchi et al.
patent: 5084343 (1992-01-01), Ogawa et al.
patent: 5089317 (1992-02-01), Noguchi et al.

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