The iron oxide grain for the toner of electrostatic copy and the iron oxide grain for the carrier of electrostatic latent image development, the iron oxide powder for the toner of electrostatic copy and the iron oxide powder for the carrier of electrostatic latent image development, the toner for electrostatic copy, production mannered null mean diameter of the carrier, and the iron oxide grain

摘要

PROBLEM TO BE SOLVED: To obtain an iron oxide particle having a high blackness degree, excellent in dispersibility and comprising a carbonaceous component more firmly and uniformly treated on the particle surface, to provide a method for producing the iron oxide particle and further to obtain an iron oxide powder comprising the iron oxide particle, a toner comprising the iron oxide powder, a carrier and a black pigment powder comprising the iron oxide powder. SOLUTION: This iron oxide particle is characterized in that a carbonaceous component having 0.05-1 μm average particle diameter in an amount of 0.1-30 wt.% based on the total amount of the iron oxide particle expressed in terms of carbon atom sticks to the particle surface and the elimination rate of the carbonaceous component is =15% when water is used as a dispersion medium.