Patent ID: 7479360

Claim:
A charge control agent comprising: aggregate particles including an azo-type iron complex salt represented by the following chemical formula [I] wherein the chemical formula [I], R 1 —, R 2 —, R 3 — and R 4 — are same or different to each other, and each one thereof is selected from the group consisting of a hydrogen atom, an alkyl group having a straight or branch chain of 1 to 18 carbon atoms, an alkenyl group having a straight or branch chain of 2 to 18 carbon atoms, a sulfonamide group, a mesyl group, a hydroxyl group, an alkoxyl group having 1 to 18 carbon atoms, an acetylamino group, a benzoylamino group, a halogen atom, a nitro group and an aryl group having no substitutional groups or one or more substitutional groups selected from the group consisting of hydroxyl group, alkyl group, aryl group, and halogen atom R 5 — is a hydrogen atom, an alkyl group having a straight or branch chain of 1 to 18 carbon atoms, a hydroxyl group or an alkoxyl group having 1 to 18 carbon atoms; R 6 — is a hydrogen atom, an alkyl group having a straight or branch chain of 1 to 18 carbon atoms, a hydroxyl group, a carboxyl group, a halogen atom or an alkoxyl group having 1 to 18 carbon atoms; x is mole ratio and 0.6 to 0.9; or the following chemical formula [II] wherein the chemical formula [II ], R 1 —, R 2 —, R 3 —, R 4 —, R 5 — and R 6 — are the same as in chemical formula [I ]; y is mole ratio and 0<y≦0.2; said aggregate particles have 0.5 to 5.0 microns of an average particle size.