Magnetic recording media

Claim 1

A magnetic recording medium comprising a non-magnetic base and, firmly bonded thereto, a magnetic layer consisting of finely divided ferromagnetic metal powder, one or more non-magnetic abrasion-resistant metal oxide powders, an organic binder and conventional assistants, wherein the layer contains, in addition to the ferromagnetic metal powder, the organic binder, conventional assistants and a dispersant, (1) from 5 to 20% by weight of one or more non-magnetic metal oxide powders selected from the group consisting of Al 2 O 3 , ZrO 2 , alpha-Fe 2 O 3 and Cr 2 O 3 , (2) from 0.02 to 1.0% by weight of a fluorinated alkyl ester which is based on polyether chains, which may or may not possess side chains, and has a molecular weight of from 700 to 800, (3) from 0.05 to 1.0% by weight of a silicone rubber based on long-chain substituted oligomeric siloxanes having a molecular weight greater than 1,500, and (4) from 0.5 to 5.0% by weight of a homopolymer or copolymer of N-vinylpyrrolidone, having a molecular weight of less than 60,000, the percentages being based on the amount of ferromagnetic metal powder.