Non-magnetic particles for non-magnetic undercoating layer of ma

Details Non-magnetic particles for non-magnetic undercoating layer of ma Non-magnetic particles for non-magnetic undercoating layer of ma

1993-08-04

1996-12-24

Kiliman, Leszek

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

428328, 428329, 428331, 428694B, 428694BS, 428694BN, 428900, 428336, G11B 566, B32B 516

Patent

active

055872328

ABSTRACT:
Disclosed herein are non-magnetic particles for a non-magnetic undercoat layer of a magnetic recording medium, comprising acicular or spindle-shaped .alpha.-Fe.sub.2 O.sub.3 particles coated with at least one selected from the group consisting of an A1 compound, a silane coupling agent, a titanate coupling agent, an aluminate coupling agent and a zirconate coupling agent; a non-magnetic undercoating layer containing such non-magnetic particles; and magnetic recording medium having such an undercoating layer.

REFERENCES:
patent: 4076890 (1978-02-01), Yamada
patent: 4789581 (1988-12-01), Nakamura
patent: 4863793 (1989-09-01), Ogawa et al.
patent: 5035948 (1991-07-01), Saito
patent: 5089317 (1992-02-01), Noguchi
patent: 5219652 (1993-06-01), Shimasoho

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