Magnetic recording medium

A magnetic recording medium comprising a non-magnetic substrate and a wear resistant magnetic layer formed thereon, said magnetic layer comprising a finely divided ferromagnetic powder dispersed in a resinous binder, said magnetic layer having been produced by the step sequence of:

• (A) forming a liquid magnetic paint composition comprising:
• a ferromagnetic powder selected from the group consisting of .gamma.-Fe.sub.2 O.sub.3, a mixed crystal of .gamma.-Fe.sub.2 O.sub.3 and Fe.sub.3 O.sub.4 doped with cobalt, Fe.sub.3 O.sub.4 doped with cobalt, chromium dioxide, barium ferrite, ferromagnetic alloy powders, and iron nitride,
• a butadiene-containing resin having an average molecular weight of 1,000 to 10,000 and being selected from the group consisting of butadiene homopolymers and copolymers of butadiene with acrylonitrile and/or styrene which contain at least 60 percent by weight of butadiene, said butadiene-containing resin having on the average more than 1.5 end functional groups reactive with isocyanate groups per molecule, and
• a solvent for said resin;
• (B) admixing with said magnetic paint composition, a polyisocyanate compound having on the average not less than 2 isocyanate groups per molecule in an amount ranging from about 5 to 50 parts by weight based upon each 100 parts by weight of said resin;
• (C) coating with the resulting composition of step (B) onto said non-magnetic substrate and
• (D) drying the so-coated composition.