Magnetic recording medium of continuous form

In a magnetic recording medium in a continuous form comprising a nonmagnetic support, a magnetic recording layer provided on one surface of the support, and a back layer provided on the other surface of the support comprising a binder and nonmagnetic particles dispersed therein, the improvement wherein said binder contains as principal ingredients:

• a polyurethane resin containing a repeating unit having at least one polar group selected from the group consisting of --so.sub.3 M, --OSO.sub.3 M, --COOM and --PO(OM').sub.2, wherein M is hydrogen or an alkali metal atom, and M' is hydrogen, an alkali metal atom or a lower hydrocarbon group, in an amount of 0.001-50 mol %;
• and
• a vinyl chloride copolymer containing a repeating unit having at least one polar group selected from the group consisting of --SO.sub.3 M, --OSO.sub.3 M, [--COOM] and --PO(OM').sub.2, wherein M and M' have the same meanings as defined above, in an amount of 0.001-5.0 mol %;
• and
• the ratio between the vinyl chloride copolymer and the polyurethane resin being in the range of from 35:65 to 80:20, by weight.