Magnetic recording medium
AssigneeKonica Corporation
InventorsTakafumi Yanagita, Tsutomu Kenpo
Life of this patent
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Abstract
A magnetic recording medium comprising at least two magnetic layers provided on a non-magnetic support, and a backing layer on the support on the side opposite to said magnetic layers, wherein said backing layer has, on the surface thereof, the protrusions each having a height of the peaks thereof within the range of 0.05 .mu.m to 0.6 .mu.m wherein the amount of the protrusions is within the range of 10,000 to 100,000 cm.sub.2 and an interval of the peaks of not less than 10 .mu.m.
Claims14
A magnetic recording medium comprising at least two magnetic layers provided on a first side of a non-magnetic support, and a backing layer on a second side of said support, wherein at least one of said magnetic layers comprises a resin containing a hydrophilic polar group selected from the group consisting of --SO.sub.3 M, --COOM, and --PO(OM).sub.2, in which M represents hydrogen or an alkali metal;
- the uppermost layer of said magnetic layers having a thickness of not more than 0.6 .mu.m;
- said backing layer having, on the surface thereof, 10,000 to 100,000 protrusions per cm.sup.2, each having a height of 0.05 to 0.6 .mu.m, and an interval between protrusions being not less than 10 .mu.m.
Dependencies are inferred from the claim text.