H - Electricity – 01 – F
Patent
H - Electricity
01
F
31/134, 117/24.4
H01F 10/10 (2006.01)
Patent
CA 1041289
Abstract of the Disclosure Magnetic recording elements comprising a magnetic layer containing dispersed particles which improve the wear resistance of the layer are disclosed. Such elements comprise a non-magnetic support and a magnetic recording layer that contains dispersed in a binder, ferromagnetic particles for recording and non-ferromagnetic particles of different average particle size. These non-ferromagnetic particles of different particle size have a Moh Hardness above that of the ferromagnetic particles. These non- ferromagnetic particles consist essentially of (a) particles having an average particle size of about 0.3 to about 2 mi- crons, present at a concentration of about 0.005 to about 0.025 parts, by weight, based on the weight of the ferro- magnetic particles, and (b) smaller particles having an average particle size up to about 0.1 micron, present at a concentration of about 0.02 to about 0.06 parts, by weight, based on the weight of the ferromagnetic particles. Suitable ferromagnetic particles include acicular iron oxides, chromium dioxide and the like. The magnetic recording elements disclosed herein, particularly the magnetic tapes, exhibit high resistance to wear and tear and low abrasiveness.
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