Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

Filed on

1987-12-03

Date issued

1989-07-11

Examiner

Thibodeau, Paul J.

Patent Class

Stock material or miscellaneous articles

SubClass

Web or sheet containing structurally defined element or...

SubSubClass

Including a second component containing structurally defined...

Other Related Categories

428336, 428694, 428900, G11B 570

Type

Patent

Status

active

Patent number

048471470

Description

ABSTRACT:
A magnetic recording medium is disclosed which comprises a non-magnetic support having coated thereon two magnetic layers, wherein an under layer of the magnetic layers contains ferromagnetic metal particles having a coercive force of 550 to 700 Oe, and wherein an upper layer of the magnetic layers contains a ferromagnetic particles having a specific surface area determined by the BET method of 25 to 35 m.sup.2 /g, a coercive force of 700 to 800 Oe and a thickness of 0.5 to 2.5 .mu.m, wherein the entire magnetic layer including the upper layer and the under layer have a coervice force of 580 to 750 Oe, a residual magnetic flux density of 2200 to 3200 gauss and a thickness of 3.0 to 5.0 .mu.m.

REFERENCES:
patent: 4109046 (1978-08-01), Hammon et al.
patent: 4500599 (1985-02-01), Ogawa et al.
patent: 4506000 (1985-03-01), Kubota
patent: 4506000 (1985-03-01), Kubota et al.
patent: 4547425 (1985-10-01), Narnse

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