Patent ID: 6030737
Filing Date: 2000-02-29
Classification: G03G

Abstract:
A non-magnetic toner for developing an electrostatic image, comprising non-magnetic toner particles produced by polymerizing in an aqueous medium a polymerizable monomer composition containing at least a polymerizable monomer, a carbon black and an azo iron compound, wherein;said carbon black has a DPB oil absorption of from 110 ml/100 g to 200 ml/100 g, a specific surface area of 100 m.sup.2 /g or below as measured by nitrogen adsorption, a volatile component of 2% or less and an average primary particle diameter of from 25 m.mu. to 45 m.mu.; andsaid azo iron compound comprises a compound represented by the following Formula (1): ##STR13## wherein R.sub.1 and R.sub.3 each represent a member selected from the group consisting of a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, an alkenyl group having 2 to 18 carbon atoms, a sulfonamide group, a mesyl group, a sulfonic acid group, a carboxylate group, a hydroxyl group, an alkoxyl group having 1 to 18 carbon atoms, an acetylamino group, a benzoylamino group and a halogen atom, and R.sub.1 and R.sub.3 are the same or different; n and n' each represent an integer of 1 to 3; R.sub.2 and R.sub.4 are each represent a member selected from the group consisting of a hydrogen atom and a nitro group, and R.sub.2 and R.sub.4 are the same or different; R.sub.5 and R.sub.6 each represent a member selected from the group consisting of a hydrogen atom, a halogen atom, a nitro group, a carboxyl group, an anilide group, an alkyl group having 1 to 18 carbon atoms, an alkenyl group, an aralkyl group, an alkoxyl group, a aryl group, a carboxylate group and a ##STR14## group, where X represents a member selected from the group consisting of a hydrogen atom, a lower alkyl group, a lower alkoxyl group, a nitro group and a halogen atom and m represents an integer of 1 to 3, and R.sub.5 and R.sub.6 are the same or different; and A.sup.+ represents a member selected from the group consisting of a hydrogen ion, a sodium ion, a potassium ion, an ammonium ion and a mixture of any of these.