MAGNETIC RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To uniformly disperse ferromagnetic powder in a magnetic layer by incorporating a diketone compd. into the magnetic layer formed by coating with a magnetic coating material contg. ferromagnetic powder and a binder as essential components. SOLUTION: A magnetic layer is formed on a nonmagnetic substrate by coating with a magnetic coating material contg. ferromagnetic powder and a binder as essential components and a diketone compd. represented by formula I is incorporated as a dispersant into the magnetic layer. The hydrophilic groups of the diketone compd. are attracted on each metallic atom of the ferromagnetic powder by coordination. The diketone compd. having ability to form a complex with the metallic atom functions as a dispersant in the magnetic layer and improves the dispersibility of the ferromagnetic powder. The ferromagnetic powder is uniformly dispersed, well exhibits its characteristics and improves electromagnetic transducing characteristics.