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AssigneeBASF SE
InventorsFritz Hammon, Manfred Ohlinger, Horst Grosselfinger, Heinz Stritzinger, Job-Werner Hartmann, Eduard Schoenafinger, Walter Schneider
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Flexible multi-layer magnetic recording media comprising a non-magnetic flexible base and, applied thereto, two superposed magnetizable layers which contain a homogeneous mixture of acicular magnetic chromium dioxide in an organic binder. According to the invention, the magnetizable layer adjacent to the base contains a chromium dioxide having a specific surface area, measured by the BET method, of from 15 to 25 m.sup.2 /g, while the outer magnetic layer contains a chromium dioxide having a specific surface area, measured by the BET method, of from 26 to 35 m.sup.2 /g. Such magnetic recording media are distinguished by uniformly high sensitivity over the entire audible frequency range even if close manufacturing tolerances are not maintained.
A magnetic recording medium comprising a non-magnetic flexible base and, applied thereto, two superposed magnetizable layers, each from 0.3 to 15.sub./ .mu.m thick, of a homogeneous mixture of acicular chromium dioxide in an organic synthetic binder with further additives, wherein the magnetizable layer adjacent to the base contains a chromium dioxide with a specific surface area, measured by the BET method, of from 15 to 25 m.sup.2 /g and the outer magnetic layer contains a chromium dioxide with a specific surface area, measured by the BET method, of from 26 to 35 m.sup.2 /g.
Dependencies are inferred from the claim text.