Magnetic recording medium having an improved back coat layer.

摘要

A magnetic recording medium which comprises, on a nonmagnetic support, a magnetic layer formed on one side of the support and a back coat layer formed on the other side of the support is described. The back coat layer has a center line average roughness, Ra, of not larger than 20 nm and protuberances on the surface of the back coat layer, which have a height from the center line of not less than 60 nm, at a rate of from 3 x 10<9> to 9 x 10<9> per square meter, by which good electromagnetic conversion characteristics and good runnability and endurance are obtained.