Patent ID: 8298738
Filing Date: 2012-10-30
Classification: G03G

Abstract:
1. A positively-chargeable toner for developing electrostatic images comprising colored resin particles containing a colorant and a binder resin, and an external additive, wherein the external additive contains talc having negatively charging ability, the talc having a number average primary particle diameter in the range from 1 to 7 μm, wherein the talc is contained at an amount of 0.23 to 1 parts by weight with respect to 100 parts by weight of the colored resin particles; and wherein an average circularity of the colored resin particles is in the range from 0.960 to 0.995, and a particle size distribution (Dv/Dn), which is the ratio of a volume average particle diameter “Dv” and a number average particle size “Dn” of the colored resin particles, is in the range from 1.0 to 1.3.