Patent ID: 7935468

Claim:
A toner, comprising at least: binder resin; colorant; and an organic boron compound acting as a charge control agent, the toner of which surface CCA (charge control agent) concentration per specific surface area of toner falls in a range from 2.1×10 −6 g/cm 2 to 5.5×10 −6 g/cm 2 and of which surface CCA concentration is 1.8×10 −3 g/g or more, wherein the following formula D 10v and D 90v satisfy the following formula (1) where D 10v represents a particle diameter at 10% of cumulative volume counted from a large-diameter side in a cumulative volume distribution, and D 90v represents a particle diameter at 90% of cumulative volume counted from the large-diameter side in the cumulative volume distribution: 0.415≦( D 10v −D 90v )/ D 10v ≦0.475 (1), wherein D 50v falls in a range of 5 μm to 8 μm where D 50v represents a particle diameter at 50% of cumulative volume counted from the large-diameter side in the cumulative volume distribution, and wherein a content of toner particles each having a diameter of 5 μm or less is 15% by number to 35% by number.