Magnetic composite particles for black magnetic toner and black magnetic toner using the same

摘要

Magnetic composite particles suitable for a black magnetic toner have an average particle diameter of 0.06 to 1.0 mu m and a coercive force value of less than 39.790 kA/m, and comprise: (a) magnetic core particles, (b) a coating on the surface of said magnetic core particles, comprising at least one organosilicon compound selected from: (1) organosilane compounds obtainable from alkoxysilane compounds, and (2) polysiloxanes or modified polysiloxanes, and (c) an organic blue-based pigment coat which is provided on said coating (b) in an amount of from 1 to 50 parts by weight based on 100 parts by weight of said magnetic core particles.