Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1989-10-13

1992-02-18

Thibodeau, Paul J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

428329, 428408, 428694, 428900, G11B 2300

Patent

active

050893319

ABSTRACT:
A magnetic recording medium composed of a non-magnetic support having thereon at least one magnetic layer containing a ferromagnetic fine powder dispersed in a binder, wherein (a) the magnetic layer further contains at least one of (i) carbon black having a sodium content of at most 100 ppm, (ii) carbon black having a chlorine content of less than 400 ppm, and (iii) an abrasive having a Mohn' hardness of at least 8 and a mean particle size of 0.05 to 0.5 .mu.m and a sodium content of at most 100 ppm; (b) the ferromagnetic fine powder is a magnetic metal powder having a sodium content of at most 200 ppm; and/or (c) the magnetic recording medium further has a back layer provided on the side of the non-magnetic support opposite to the magnetic layer, containing carbon black having a chlorine content of at most 300 ppm dispersed in a binder. The magnetic recording medium has superior storage stability, with remarkably limited dropout increase, head clogging, C S/N decrease and RF output decrease.

REFERENCES:
patent: 4582757 (1986-04-01), Miyoshi et al.
patent: 4654258 (1987-03-01), Kawamata et al.
patent: 4734325 (1988-03-01), Ryoke et al.
patent: 4801505 (1989-01-01), Ejiri et al.
patent: 4803121 (1989-02-01), Ryoke et al.
patent: 4820581 (1989-04-01), Saito et al.

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