CARRIER CORE MATERIAL FOR ELECTROPHOTOGRAPHIC DEVELOPMENT, CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPMENT AND METHOD FOR MANUFACTURING THE SAME, AND ELECTROPHOTOGRAPHIC DEVELOPER

PROBLEM TO BE SOLVED: To provide a carrier core material for manufacturing an electrophotographic developer which enables high-speed development with stable high image quality and ensures the long life of a magnetic carrier for replacement even when applied to an MFP (multifunction printer), etc., a method for manufacturing the carrier core material, a magnetic carrier containing the carrier core material, and an electrophotographic developer manufactured from the magnetic carrier. SOLUTION: Resin particles, a binder, a dispersant, a wetting agent and water are added to raw material powder, wet-ground and dried to obtain granules, and the granules are calcined and fired to manufacture the carrier core material having an internal hollow structure. The carrier core material is coated with a resin to obtain the carrier for electrophotographic development. This carrier for electrophotographic development and a toner are mixed to manufacture the electrophotographic developer. COPYRIGHT: (C)2007,JPO&INPIT