Magnetic recording tapes with two-layered magnetic coating

Details Magnetic recording tapes with two-layered magnetic coating Magnetic recording tapes with two-layered magnetic coating

1976-10-21

1978-02-21

Kendall, Ralph S.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

106290, 106304, 346135, 360131, 423633, 423634, 427127, 427131, 428329, 428900, B32B 516, B32B 702, B32B 1502

Patent

active

040753840

ABSTRACT:
A magnetic recording tape of improved properties comprising a non-magnetic support and a two-layered magnetic coating composed of a ferromagnetic powder and a binder and formed on one surface of the support, wherein the lower magnetic layer has a coercive force of about 250 to about 300 Oe, a residual magnetic flux density of at least about 1,500 Gauss and a dry thickness of at least about 2.5 .mu.m, and the upper magnetic layer has a coercive force of about 350 to about 400 Oe, a residual magnetic flux density of not more than about 1,500 Gauss and a dry thickness of about 2.0 to 3.0 .mu.m, the ferromagnetic powder in the upper magnetic layer having an APP value of not more than 1.0.

REFERENCES:
patent: 2643130 (1953-06-01), Kornei
patent: 3149996 (1964-09-01), Wagner et al.
patent: 3328195 (1967-06-01), May
patent: 3734772 (1973-05-01), Schnell et al.
patent: 3761311 (1973-09-01), Perrington et al.
Chikazumi, Physics of Ferromagnetic Substances, in Selected Works or Physics, No. 4, 4th Ed., 8/1/65, Shokabo, Japan.

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