Magnetic recording medium having an underlayer containing three

Details Magnetic recording medium having an underlayer containing three Magnetic recording medium having an underlayer containing three

1995-01-25

1997-09-30

Resan, Stevan A.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

428328, 428329, 428331, 428332, 428336, 428694BS, 428900, 427130, 427131, G11B 568

Patent

active

056724233

ABSTRACT:
A magnetic recording medium containing a support having thereon in order, a non-magnetic layer unit and a magnetic layer unit, said magnetic recording medium having been produced by providing a non-magnetic layer unit containing at least one non-magnetic layer and comprising a non-magnetic powder dispersed in a binder on a non-magnetic support followed by providing, while the non-magnetic layer is still wet, a magnetic layer unit containing at least one magnetic layer and comprising a ferromagnetic powder dispersed in a binder on the non-magnetic layer, wherein the mean thickness of the magnetic layer is 1.0 .mu.m or less and the non-magnetic powder in the non-magnetic layer comprises (A) a tabular non-magnetic powder having a tabular size of from 0.01 to 0.3 .mu.m and an aspect ratio of from 3 to 20, or an acicular non-magnetic powder having a long axis of from 0.05 to 0.25 .mu.m and an aspect ratio of from 3 to 15, (B) a carbon black powder having a mean particle size of from 0.01 to 0.04 .mu.m and (C) a powder component having a larger mean particle size than the mean particle size of either powders (A) or (B).

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patent: 5415933 (1995-05-01), Ishiguro et al.
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