Magnetic recording medium

摘要

A magnetic recording medium is disclosed, comprising a non-magnetic support having provided thereon at least a lower non-magnetic layer comprising a binder having dispersed therein a non-magnetic powder and an upper magnetic layer comprising a binder having dispersed therein a ferromagnetic powder which has been formed on the lower non-magnetic layer while the lower non-magnetic layer is wet, wherein the upper magnetic layer has a dry thickness of not more than 1.0 mu m, the ferromagnetic powder in the upper magnetic layer has an average major axis of not more than 0.3 mu m and an average crystallite size of not more than 300 ANGSTROM , the non-magnetic powder in the lower non-magnetic layer contains (i) a non-magnetic metal oxide powder and (ii) carbon black having an average primary particle diameter of less than 20 nm at a weight ratio of from 95/5 to 60/40, and the lower non-magnetic layer contains a polyurethane having at least three hydroxyl groups in the molecule thereof and a polyisocyanate compound. The magnetic recording medium exhibits excellent electromagnetic characteristics, running properties, and durability.