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

摘要

PROBLEM TO BE SOLVED: To provide a carrier core material for an electrophotographic developer that improves the volume resistivity value, without causing decrease in the magnetic characteristics nor decrease in powder characteristics, and to provide a method of manufacturing the same. Ž

SOLUTION: The carrier core material for the electrophotographic developer contains a magnetite or soft ferrite, and has an oxide layer of 0.1 m2/g to 0.2 m2/g in specific surface area formed on its surface, by carrying out a heat treatment under an inert atmosphere of 300 to 400°C after mechanical agitation for 30 to 180 minutes at a rotating speed of 2,000 to 4,000 rpm, the volume resistivity value being not less than 1.0E+07(Ω cm), when a voltage of 100V is applied. Ž

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