Patent ID: 9588450
Date: 2017-03-07
CPC Classifications: G03G

Claim:
1. A magnetic toner, comprising: a magnetic toner particle comprising a binder resin and a magnetic material; a first external additive; and a second external additive, wherein: the first external additive i) comprises an organic-inorganic composite fine particle, a plurality of convexes derived from an inorganic fine particle being present on a surface of the organic-inorganic composite fine particle, and ii) has a number-average particle diameter of 50 nm or more and 500 nm or less; the second external additive i) comprises a silica fine particle, and ii) has a number-average particle diameter of 5 nm or more and 30 nm or less; a shear load calculated from a rotation torque is 0.50 kPa or more and 2.00 kPa or less when a disc-shaped disc is pressed against a surface of a magnetic toner powder layer, the magnetic toner powder layer being produced by applying a vertical load of 9.0 kPa to the magnetic toner, under a vertical load of 5.0 kPa in a measurement container, and the disc which is being pressed is rotated by π/36 rad at (π/10 rad)/min; and an absolute value |ζ(T)−ζ(A1)| of a difference between a zeta potential ζ(T) of the magnetic toner particle dispersed in water and a zeta potential ζ(A1) of the first external additive dispersed in water is 50 mV or less.