High recording density magnetic recording medium having an undercoat layer of iron oxide and carbon black

High recording density magnetic recording medium having an undercoat layer of iron oxide and carbon black

PCT No. PCT/US94/01331 Sec. 371 Date Aug. 8, 1995 Sec. 102(e) Date Aug. 8, 1995 PCT Filed Feb. 7, 1994 PCT Pub. No. WO94/18672 PCT Pub. Date Aug. 18, 1994A high recording density magnetic recording medium including a non-magnetic base film, a magnetic layer, and an undercoat layer provided therebetw...

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Bibliographische Detailangaben
Hauptverfasser: OIRI, SHIGETO, TSUKAMOTO, YOJI, OHTA, TOSHIO
Format: Patent
Sprache:eng
Schlagworte:
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
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Zusammenfassung:PCT No. PCT/US94/01331 Sec. 371 Date Aug. 8, 1995 Sec. 102(e) Date Aug. 8, 1995 PCT Filed Feb. 7, 1994 PCT Pub. No. WO94/18672 PCT Pub. Date Aug. 18, 1994A high recording density magnetic recording medium including a non-magnetic base film, a magnetic layer, and an undercoat layer provided therebetween. The undercoat layer includes non-magnetic particles, a binder resin, and a lubricant. The non-magnetic particles comprise (1) a non-magnetic iron oxide with an acicular ratio ranging from 5 to 10 and a long axis length ranging from 0.05 to 0.3 mu m, and (2) a carbon black having a structure constitution, and the weight ratio between said non-magnetic iron oxide and said carbon black is within the range between 85/15 and 99/1.