Magnetic recording medium and process for the preparation thereo

Details Magnetic recording medium and process for the preparation thereo Magnetic recording medium and process for the preparation thereo

1992-02-04

1992-10-27

Thibodeau, Paul J.

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Structurally defined web or sheet

Including components having same physical characteristic in...

427127, 427128, 427130, 427131, 428213, 428216, 428323, 428336, 428694, 428900, G11B 2300

Patent

active

051588226

ABSTRACT:
A novel magnetic recording medium is disclosed which comprises a non-magnetic support having thereon at least three magnetic layers each layer of which containing a ferromagnetic powder dispersed in a binder, wherein the outermost magnetic layer arranged farthest from the support has a dry thickness of 1 .mu.m or less, and the at least three magnetic layers each exhibit coercive force Hc (Oe) satisfying the following relationships: ##EQU1## wherein H.sub.1 represents Hc of the outermost magnetic layer; Hn represents Hc of the magnetic layer which is the n-th layer from the outermost magnetic layer and arranged between the outermost layer and the non-magnetic support; and Dn represents the distance (.mu.m) from the top surface of the outermost magnetic layer to the top surface of the n-th layer. A novel process for the preparation of the magnetic recording medium is also disclosed.

REFERENCES:
patent: 2643130 (1949-11-01), Kornei
patent: 4091158 (1978-05-01), Kasuga et al.
patent: 4409281 (1983-10-01), Kitamoto et al.
patent: 4741953 (1988-05-01), Katsuta et al.
patent: 4851289 (1989-07-01), Ogawa et al.
Patent Abstracts of Japan, vol. 9, No. 24 (P-331) (1747) 31 Jan. 1985, & JP-A-59 167845 (Hitachi Maxell K.K.) 21 Sep. 1984.

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