Toner

摘要

Problem to be solved: to reduce the wear and the contamination of the image forming apparatus to the key parts, and to use the toner for the long term durability.A toner having a toner particle and an external additive;External additiveContains composite particles coated with organosilicon polymer particles on the surface of alumina particlesThe coverage of the surface of the alumina particles by the organic silicon polymer particles is1% or more and 50% or lessThe average particle size of primary particles of the organic silicon polymer particle is a (nm).When the average particle size of the primary particles of the alumina particles is set to B (nm),The toner characterized by the following expressions (I) and (II).A.leq. 90 (I)100. Leq. B.leq. 1000 (II)No selection