Magnetic recording medium

摘要

Provided is a magnetic recording medium having excellent dispersibility, smoothness and electromagnetic characteristics. The magnetic recording medium comprises at least one magnetic layer comprising a ferromagnetic powder and a binder on a nonmagnetic support. Said ferromagnetic powder is a ferromagnetic metal powder having an average major axis length of 10 to 80 nm and a crystallite size of 8 to 18 nm, or a ferromagnetic hexagonal ferrite powder having an average plate diameter of 5 to 40 nm, and said binder comprises 0.2 to 0.7 meq/g of at least one polar group selected from -SO₃M, -OSO₃M, -PO(OM)₂, -OPO(OM)₂ and -COOM (where M denotes a hydrogen atom, alkali metal or ammonium salt), and/or 0.5 to 5 meq/g of at least one polar group selected from -CONR₁R₂, -NR₁R₂ and -NR₁R₂R₃⁺ (where R₁, R₂ and R₃ independently denote hydrogen atoms or alkyl groups).