| 摘要 |
The invention provides a magnetic recording medium having a structure in which a magnetic layer containing magnetic particles and a binder is formed on a nonmagnetic layer containing nonmagnetic particles and a binder, wherein the binder contained in the nonmagnetic layer contains a polyurethane resin which has a metal sulfonate group and unsaturated hydrocarbon groups in its molecule and is obtained by reacting a polyester polyol (A) containing an aliphatic dicarboxylic acid as an acid component, an aromatic polyisocyanate compound (B), a compound (C) having unsaturated hydrocarbon groups and a functional group which reacts with an isocyanate group and a molecular weight of 500 or less with a branched compound (D) represented by the following formula (1), and the nonmagnetic layer has good dispersibility even by using fine nonmagnetic particles and can ensure satisfactory coating film strength even at a radiation dose of 3 Mrad or less.
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