Magnetteilchen für magnetische Toner und ihrer Herstellungsverfahren

摘要

Magnetic particles suitable for use in a magnetic toner, which particles comprise Fe<2+>-containing iron oxide particles which: (a) have an average particle size of from 0.05 to 0.30 mu m; (b) contain from 0.9 atm% to less than 1.7 atm% of silicon, calculated as Si, based on Fe; (c) have a substantially cubic shape, each ridge of which has a curved surface; and (d) have a ratio ( phi ) of the average maximum length of said Fe<2+>-containing particles to the average minimum length of said Fe<2+>-containing particles of from more than 1.0:1 to less than 1.4:1.