Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1989-02-13

1991-09-24

Thibodeau, Paul J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428329, 428336, 428408, 428694, 428900, G11B 2300

Patent

active

050513206

ABSTRACT:
A magnetic recording medium comprises a non-magnetic support having provided thereon a lower magnetic layer having a thickness of 2.5 .mu.m or higher and an upper magnetic layer having a thickness of 2 .mu.m or lower in this order, wherein both the upper and lower magnetic layers contain ferromagnetic particles, and the lower magnetic layer contains carbon black having an average primary particle diameter of less than 20 .mu.m in the amount of from 1.0 to 20 parts by weight per 100 parts by weight of the ferromagnetic particles contained in the lower magnetic layer, and the upper magnetic layer contains carbon black having an average primary particle diameter of at least 40 .mu.m but less than 80 .mu.m in an amount of from 0.1 to 10.0 parts by weight per 100 parts by weight of the ferromagnetic particles contained in the upper magnetic layer, but less than the amount of carbon black used in the lower magnetic layer.

REFERENCES:
patent: 4259392 (1981-03-01), Suzuki
patent: 4511617 (1985-04-01), Hideyama et al.
patent: 4546038 (1985-10-01), Yamaguchi 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: 4851289 (1989-07-01), Ogawa et al.
patent: 4865924 (1989-09-01), Saito et al.
patent: 4946740 (1990-08-01), Ono et al.

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