Magnetic recording medium containing a biaxially oriented multil

Details Magnetic recording medium containing a biaxially oriented multil Magnetic recording medium containing a biaxially oriented multil

1993-08-17

1995-05-16

Thibodeau, Paul J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

428402, 428694B, 428694BN, 428694BM, 428694ST, 428694SL, 428694SG, 428910, B32B 3300, G11B 566, G11B 570

Patent

active

054159334

ABSTRACT:
A magnetic recording medium is disclosed, which is formed by providing on a non-magnetic support, a lower layer comprising at least one of a ferromagnetic powder and a non-magnetic powder dispersed in a binder, and providing on the lower layer while the lower layer is in a wet condition, an upper magnetic layer comprising a ferromagnetic powder dispersed in a binder, wherein the upper magnetic layer has a dry thickness of 1.0 .mu.m or less, and the non-magnetic support is a multi-layer structural support comprising at least an uppermost support layer and a lowermost support layer, wherein the uppermost support layer is coated with the lower non-magnetic or magnetic layer, each of the uppermost layer and the lowermost layer comprises a biaxially oriented film comprising a thermoplastic resin containing filler particles, and the uppermost support layer has a center line average surface roughness Ra in the range defined by the following formula:

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