Magnetic recording medium and magnetic tape cassette mounted wit

Details Magnetic recording medium and magnetic tape cassette mounted wit Magnetic recording medium and magnetic tape cassette mounted wit

1993-03-26

1995-07-25

Kiliman, L.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

428323, 428328, 428329, 428331, 428694B, 428694BR, 428694BN, 428694BS, 428694BM, 428694SG, 360 88, 360 90, 360 93, 360134, B32B 310, G11B 566, G11B 1500

Patent

active

054360552

ABSTRACT:
A magnetic recording medium and a magnetic tape cassette are disclosed, comprising a non-magnetic support having formed on one surface only thereof at least two layers including a lower layer and an upper magnetic layer formed thereon, wherein the surface electric resistance (Rs) of the surface of the magnetic layer of said magnetic recording medium is 10.sup.9 .OMEGA./sq or less, the non-magnetic support contains at least three different kinds of particles which vary from each other in at least one property of mean particle diameter and Mohs' hardness, and the opposite surface of the magnetic recording medium comprises the rear surface of the nonmagnetic support having at least 1,000 projections having a height of from 200 nm to 400 nm per 0.1 mm.sup.2, but with the provisos that not more than 1,000 projections are present having a height of from 400 nm to 700 nm per 0.1 mm.sup.2 and not more than 50 projections are present having a height of 700 nm or more per 0.1 mm.sup.2.

REFERENCES:
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patent: 4720412 (1988-01-01), Katoh et al.
patent: 4732799 (1988-03-01), Sakamoto et al.
patent: 4772522 (1988-09-01), Kubota
patent: 4818581 (1989-04-01), Katoh et al.
patent: 4910068 (1990-03-01), Takagi et al.
patent: 5085915 (1992-02-01), Taga et al.
patent: 5324582 (1994-06-01), Goto

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