RESIN-COATED CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPING AGENT, PROCESS FOR PRODUCING THE SAME AND ELECTROPHOTOGRAPHIC DEVELOPING AGENT UTILIZING THE RESIN-COATED CARRIER

摘要

A resin-coated ferrite carrier for electrophotographic developing agent having a small particle diameter and exhibiting high sphericity and surface uniformity, in which a carrier core material of small standard deviation is employed; a process for producing the same; and an electrophotographic developing agent utilizing the resin-coated ferrite carrier, which realizes high image quality and excels in durability. There is provided a resin-coated carrier for electrophotographic developing agent, characterized in that it is comprised of spherical ferrite particles of 20 to 50 mum average diameter, >=90% surface uniformity, 1 to 1.3 average sphericity and <=0.15 sphericity standard deviation. Further, there is provided a process for producing the same, and provided an electrophotographic developing agent utilizing the resin-coated carrier.