Magnetic recording medium having a non-magnetic underlayer containing electrically conductive tin oxide coated pigment
AssigneeKonica Corporation
InventorNoboru Koyama
Life of this patent
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Abstract
Disclosed is a magnetic recording medium cassette which comprises a cassette case of storing a magnetic recording medium which comprises; (a) a support; and provided thereon, in sequence (b) at least one non-magnetic colored layer; and (c) at least one magnetic layer wherein the specific surface resistance of the magnetic layer is not more than 1.0.times.10.sup.10 .OMEGA./square. A magnetic recording medium according to this invention is improved the drop-out level and the running durability and a magnetic recording medium cassette can be discriminated whether it is a pirated edition or not.
Claims9
A magnetic recording medium which comprises;
- (a) a support;
- and provided thereon, in sequence
- (b) a non-magnetic layer having a thickness of 0.5 to 6 .mu.m and containing an electrically conductive coated pigment, said pigment being coated with a compound selected from the group consisting of tin oxide and an antimony solid solution type tin oxide,
- (c) a magnetic layer, wherein the specific surface resistance of the magnetic layer is not more than 1.0.times.10.sup.10 .OMEGA./square, and
- (d) said magnetic layer and said non-magnetic layer are formed by a wet-on-wet method.
Dependencies are inferred from the claim text.