Magnetic recording substance
First Claim
1. A magnetic recording substance comprising a non-magnetic support film having a magnetic recording layer on one side and a back coating comprising a thin layer of a resinous binder having dispersed therein a mixture of inorganic powders comprising as a major component an inorganic powder having grain size of 0.02-5 microns and as a minor component an inorganic powder having a grain size of 2-40 microns, said minor component forming with said major component and binder on said film a coating having spike grains extending outwardly from the non-magnetic surface to a height of 0.8-5 microns at a pitch of at least 200 microns to yield a tape having a coefficient of friction of at least 0 on 25.
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Accused Products
Abstract
In a magnetic recording substance comprising a magnetic recording layer on one side of a non-magnetic support and a back layer on the other side thereof, the back layer is provided by coating a powdered solid with a binder and coating solvent and having spike grains with a height of 0.8 to 5 microns and an interval or pitch of at least 200 microns on the surface thereof and a friction coefficient of at least 0.25.
53 Citations
12 Claims
- 1. A magnetic recording substance comprising a non-magnetic support film having a magnetic recording layer on one side and a back coating comprising a thin layer of a resinous binder having dispersed therein a mixture of inorganic powders comprising as a major component an inorganic powder having grain size of 0.02-5 microns and as a minor component an inorganic powder having a grain size of 2-40 microns, said minor component forming with said major component and binder on said film a coating having spike grains extending outwardly from the non-magnetic surface to a height of 0.8-5 microns at a pitch of at least 200 microns to yield a tape having a coefficient of friction of at least 0 on 25.
Specification