Patent ID: 7879520

Claim:
A toner for developing an electrostatic image comprising a binding resin and a charge control agent including an azo-type iron complex salt represented by the following chemical formula (1) wherein R 1 and R 3 are the same or different from each other and are an alkyl group having a straight chain or a branch chain of 3 to 8 carbons; R 2a , R 2b , R 4a and R 4b are the same or different from each other and are selected from the group consisting of a hydrogen atom, an alkyl group, an alkoxyl group, a halogen atom, a nitro group and a carboxyl group; A + indicates m(H + )+n(K + ), wherein m and n satisfy numerical equations of m+n=1, 0.7≦m<1, and 0<n≦0.3, wherein an average particle size of the charge control agent is 1 to 4 microns, and a specific volume resistivity thereof is ranging from 0.2×10 15 to 7×10 15 Ω·cm.