Magnetic recording medium

Claim 1

A magnetic recording medium comprising a non-magnetizable plastic film support having a magnetic recording layer on one side thereof and, on the other side thereof, a layer containing (1) at least one powder selected from the group consisting of carbon black and graphite, and (2) at least one powder composed of a light colored pigment, and (3) a binder, powders (1) and (2) forming coplanarly divided continuous dark color areas and discontinuous light color areas in the layer containing same, said layer being a back surface layer and having a dry thickness ranging from about .1 to about 10 microns and being obtained from an organic solvent dispersion by agitating said organic solvent dispersion for 10 to 200 hours at 100 rotations per minute before coating onto said plastic film support: the dark color areas being so colored due to the presence of the at least one powder selected from the group consisting of carbon black and graphite and the light color areas being so colored due to the presence of the light colored pigment; the dark color area/light color area ratio being from 80/20 to 20/80%, by square ratio; each divided color area covering a 3 to 500 sq. micron area; and the back surface layer having a surface electrical resistance below 1 × 10 10 ohm/cm 2 where said back surface layer has been formed by coating on said support a single coating solution which is a dispersion of said powders in a solution of said binder in an organic solution and drying.