| 摘要 |
PROBLEM TO BE SOLVED: To improve dispersibility of a metal magnetic powder in a magnetic layer and to improve electromagnetic conversion characteristics by incorporating a phenylhydroxyl amine compd. or aromatic diazo compd. as a dispersant of a magnetic layer comprising a metal magnetic powder and a binder into the magnetic layer. SOLUTION: Relating to a magnetic layer produced by applying a magnetic coating material essentially comprising a metal magnetic powder having >=35 m<2> /g specific surface area and a binder, a phenylhydroxyl amine compd. or aromatic diazo compd. (hereinafter called as ligand) is subjected to coordination adsorption to the magnetic powder. These ligands are mixed with the metal magnetic powder and the binder during the magnetic coating material is prepared, and the mixed material is kneaded and dispersed with a solvent to carry out coordination adsorption to the metal magnetic powder. The ligands coordinated and adsorbed to the surface of the metal magnetic powder inhibit aggregation of metal magnetic powder particles, and therefore, the ligands act as a dispersant to improve the dispersibility of the metal magnetic powder in the binder. |
