Magnetic recording medium for a video tape recorder and a method

Details Magnetic recording medium for a video tape recorder and a method Magnetic recording medium for a video tape recorder and a method

1988-10-19

1992-01-21

Thibodeau, Paul J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

428336, 428694, 428900, 427131, G11B 2300

Patent

active

050827294

ABSTRACT:
A magnetic recording medium for a video tape recorder is disclosed, comprising a nonmagnetic support having thereon in the following order an under magnetic layer containing ferromagnetic particles of metal oxide and an upper magnetic layer containing ferromagnetic particles of metal oxide, wherein said under magnetic layer contains the ferromagnetic particles having a specific surface area by a BET method of from 26 to 50 m.sup.2 /g and a coercive force (Hc.sub.1) of from 500 to 1,000 Oe; said upper magnetic layer contains the ferromagnetic particles having a specific surface area by a BET method of from 30 to 60 m.sup.2 /g and a coercive force (Hc.sub.2) of from 600 to 1,200 Oe; the dry thickness of the upper magnetic layer is from 0.1 to 1.0 .mu.m; and the coercive force (Hc.sub.2) of the ferromagnetic particles for the upper magnetic layer is higher than the coercive force (Hc.sub.1) of the ferromagnetic particles for the under magnetic layer.

REFERENCES:
patent: 3473960 (1969-10-01), Jacobson et al.
patent: 4624883 (1986-11-01), Yamaguchi et al.
patent: 4643941 (1987-02-01), Miyoshi et al.
patent: 4689263 (1987-08-01), Kambe et al.
patent: 4784495 (1988-11-01), Mizuno et al.
patent: 4865924 (1989-09-01), Saito et al.

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