Magnetic recording medium comprising an underlayer containing .a

Details Magnetic recording medium comprising an underlayer containing .a Magnetic recording medium comprising an underlayer containing .a

1994-07-26

1996-03-05

Resan, Stevan A.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428328, 428329, 428336, 428403, 428694BS, 428694BM, 428900, G11B 500

Patent

active

054966221

ABSTRACT:
Disclosed is a magnetic recording medium which comprises a non-magnetic support and a layer containing .alpha.-iron oxide powder as a lower layer and a layer containing ferromagnetic powder as an upper layer which are provided on the non-magnetic support in this order from a side of the non-magnetic support, wherein weight ratios of elements in the whole composition of the .alpha.-iron oxide powder are 0.05 to 5 parts by weight of aluminum (Al) atom and 0.05 to 5 parts by weight of silicon (Si) atom based on 100 parts by weight of iron (Fe) atom, and average existence ratios of elements in terms of the number of atoms forming the surface of the .alpha.-iron oxide powder are 40 or less of Al atom and 1 to 60 of Si atom based on the number of Fe atom as 100.

REFERENCES:
patent: 4404254 (1983-09-01), Frauz et al.
patent: 4956220 (1990-09-01), Sueyoshi et al.
patent: 5110658 (1992-05-01), Nakano et al.
patent: 5258223 (1993-11-01), Inaba et al.
patent: 5268206 (1993-12-01), Komatsu et al.
patent: 5358777 (1994-10-01), Kojima et al.

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