Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Patent
1993-11-30
1995-10-03
Resan, Stevan A.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
428323, 428328, 428329, 428694BM, 428694BS, 428694BN, 428900, G11B 500
Patent
active
054551048
ABSTRACT:
The present invention provides a magnetic recording medium comprising a support, lower magnetic layer comprising ferromagnetic powder and nonmagnetic powder dispersed in a binder and an upper magnetic layer which contains ferromagnetic powder dispersed in a binder. The lower layer has a coercive force of not less than 200 Oe, a saturation magnetic flux density in the range of 5-1000 gauss and non magnetic particles with a specific gravity of not less than 2.5. The ferromagnetic powder of the upper layer is a ferromagnetic metal powder containing Fe and Al, and the ratio of non magnetic powder to magnetic powder in the lower magnetic layer is from 50/50 to 99/1.
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Goto Narito
Isobe Ryosuke
Sekiguchi Nobuyuki
Takahashi Hideki
Takeda Katsuyuki
Bierman Jordan B.
Konica Corporation
Resan Stevan A.
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