CARRIER CORE MATERIAL FOR ELECTROPHOTOGRAPH DEVELOPMENT, CARRIER FOR ELECTROPHOTOGRAPH DEVELOPMENT AND PROCESS FOR PRODUCING THE SAME, AND ELECTROPHOTOGRAPH DEVELOPING AGENT

The present invention provides a carrier core material for use in the production of an electrophotographic developer which, even when applied, for example, to MFPs (multifunction printers), can realize stable, high-quality and high-speed development, and has a prolonged replacing life of magnetic carriers, and a method of manufacturing the same, a magnetic carrier including the carrier core material, and an electrophotographic developer manufactured from the magnetic carrier. An electrophotographic development carrier is prepared by adding resin particles, a binder, a dispersant, a wetting agent, and water to a raw material powder, wet pulverizing the mixture, drying the pulverized product to give granulated powder, calcinatng the granulated powder, and then sintering the granulated powder to prepare a carrier core material having an internally hollow structure, and coating the carrier core material with a resin. An electrophotographic developer is manufactured by mixing the electrophotographic development carrier with a toner.