FERRITE PARTICLE, CARRIER FOR ELECTROPHOTOGRAPHIC IMAGE DEVELOPMENT AND DEVELOPER FOR ELECTROPHOTOGRAPHIC IMAGE DEVELOPMENT USING THE FERRITE PARTICLE AND METHOD OF PRODUCING THE FERRITE PARTICLE

摘要

PROBLEM TO BE SOLVED: To provide a ferrite particle which can suppress deterioration of charging characteristics due to residue of a coating resin on the surface of the particle during prolonged use.SOLUTION: A ferrite particle contains Mn ferrite as the main phase and Sr ferrite and has an irregularity of the particle surface of 2.5-4.5 μm and a standard deviation of the size of grains appearing in the particle surface of 1.5-3.5 μm.