Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including a second component containing structurally defined...
Patent
1992-01-21
1993-11-02
Thibodeau, Paul J.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including a second component containing structurally defined...
428336, 4284231, 428694TL, 428900, 428694B, 428694BS, B32B 516, B32B 2700, G11B 566
Patent
active
052582230
ABSTRACT:
A magnetic recording medium is disclosed, comprising a non-magnetic support having provided thereon at least a lower non-magnetic layer comprising a binder having dispersed therein a non-magnetic powder and an upper magnetic layer comprising a binder having dispersed therein a ferromagnetic powder which has been formed on the lower non-magnetic layer while the lower non-magnetic layer is wet, wherein the upper magnetic layer has a dry thickness of not more than 1.0 .mu.m, the ferromagnetic powder in the upper magnetic layer has an average major axis of not more than 0.3 .mu.m and an average crystallite size of not more than 300 .ANG., the non-magnetic powder in the lower non-magnetic layer contains (i) a non-magnetic metal oxide powder and (ii) carbon black having an average primary particle diameter of less than 20 nm at a weight ratio of from 95/5 to 60/40, and the lower non-magnetic layer contains a polyurethane having at least three hydroxyl groups in the molecule thereof and a polyisocyanate compound. The magnetic recording medium exhibits excellent electromagnetic characteristics, running properties, and durability.
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Ejiri Kiyomi
Inaba Hiroo
Fuji Photo Film Co. , Ltd.
Kiliman Leszek
Thibodeau Paul J.
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