Magnetic recording medium

Abstract

Disclosed are magnetic recording media having excellent running durability and electromagnetic characteristics and comprising a lower layer comprising a magnetic powder or nonmagnetic powder and a binder and one or more upper magnetic layers comprising a ferromagnetic powder and a binder in this order on a nonmagnetic support. In one mode, at least said lower layer comprises a binder comprising polyurethane resin having a glass transition temperature ranging from 100 to 200° C., and a magnetic layer positioned as the topmost layer among said upper magnetic layers comprises 5 to 1,000 surface protrusions of 10 to 20 nm in height per 100 μm2 on the surface thereof. In another mode, at least a magnetic layer positioned as the topmost layer among said upper magnetic layers comprises a binder comprising polyurethane resin having a glass transition temperature ranging from 100 to 200° C., and said magnetic layer positioned as the topmost layer among the upper magnetic layers comprises 5 to 1,000 surface protrusions of 10 to 20 nm in height per 100 μm2 on the surface thereof.

Dependencies are inferred from the claim text.