Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including a second component containing structurally defined...
Patent
1990-08-31
1991-07-30
Thibodeau, Paul J.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including a second component containing structurally defined...
427131, 428336, 428694, 428900, G11B 2300
Patent
active
050359487
ABSTRACT:
A magnetic recording medium is disclosed, comprising a nonmagnetic support having thereon an under magnetic layer and an upper magnetic layer in that order, wherein the thickness of the upper magnetic layer is less than 0.5 .mu.m and abrasive agents, which have a Mohs' hardness of 6 or more and have an average particle diameter of 0.5 .mu.m or less, are contained in the upper magnetic layer. And a method for preparing a magnetic recording medium which comprises coating a coating composition for an under magnetic layer on a running non-magnetic support, and successively coating thereon a coating composition for an upper magnetic layer containing abrasive agents, which have a Mohs' hardness of 6 or more and an average particle diameter of 0.5 .mu.m or less, in a dry thickness of less than 0.5 .mu.m while the under magnetic layer is wet.
REFERENCES:
patent: 4643941 (1987-02-01), Hiyoshi et al.
patent: 4743500 (1988-05-01), Miyashi et al.
patent: 4844946 (1989-07-01), Komatsu et al.
Ogawa Hiroshi
Saito Shinji
Fuji Photo Film Co. , Ltd.
Thibodeau Paul J.
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