Patent ID: 8043781

Claim:
A two-component developer comprising a carrier and a toner comprising a small-particle diameter external additive having a number average particle diameter of 7 to 20 nm, a large-particle diameter external additive having a number average particle diameter of 40 to 80 nm and a toner particle having a volume average particle diameter of 4 to 7 μm, wherein the large-particle diameter external additive is stuck to the surface of the toner particles in a semi-embedded state and has a rate of liberation of 0.1% by weight or less from the surface of the toner particle, wherein the small-particle diameter external additive has the rate of liberation of 0.5-3.0% by weight from the surface of the toner particle, the large-particle diameter external additive is contained in a range from 0.5-2 wt % based on the toner particle, and the small-particle diameter external additive is contained in a range from 0.4-3 wt % based on the toner particle.