Patent ID: 6696211
Filing Date: 2004-02-24
Classification: G03G

Abstract:
A developer for developing an electrostatic latent image, including:toner particles each comprising a binder resin and a colorant, inorganic fine powder having a number-average particle size of 4-80 nm based on primary particles; and electroconductive fine powder; wherein the developer (i) has a number-basis particle size distribution in the range of 0.60-159.21 &mgr;m including 15-60% by number of particles in the range of 1.00-2.00 &mgr;m, and 15-70% by number of particles in the range of 3.00-8.96 &mgr;m, each particle size range including its lower limit and excluding its upper limit and the electroconductive fine powder (i) is non-magnetic, (ii) has a resistivity of at most 109 ohm.cm, (iii) is present in amounts from 1 to 10 wt. % of the developer and (iv) contain 5-300 particles having a particle size in the range from 0.6-3 &mgr;m per 100 toner particles.