Patent ID: 8603652

Claim:
A magnetic recording medium comprising on one surface of a nonmagnetic support a nonmagnetic layer containing a nonmagnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder in this order, as well as comprising a backcoat layer on the other surface of the nonmagnetic support, wherein the nonmagnetic layer is a radiation-cured layer formed by curing with radiation a radiation-curable composition, the radiation-curable composition comprises a radiation-curable vinyl chloride copolymer containing a structural unit denoted by formula (1) and a radiation-curable polyurethane resin obtained from starting materials containing a sulfonic acid group containing- or sulfonate group-containing polyol compound denoted by formula (2): wherein, in formula (1), R 1 denotes a hydrogen atom or a methyl group, and L 1 denotes a divalent linking group denoted by formula (2a), formula (3), or formula (4): wherein, in formula (4), R 41 denotes a hydrogen atom or a methyl group; wherein, in formula (2), X denotes a divalent linking group; each of R 101 and R 102 independently denotes an alkyl group containing at least one hydroxyl group and equal to or more than two carbon atoms or an aralkyl group containing at least one hydroxyl group and equal to or more than eight carbon atoms; and M 1 denotes a hydrogen atom or a cation; and the backcoat layer comprises filler particles with an average primary particle diameter, D50, ranging from 0.05 to 1.0 μm, the filler particles being selected from the group consisting of organic polymer particles and inorganic colloidal particles.