| abstract |
A ferrite carrier core material for an electrophotographic developer, a ferrite carrier, a ferrite carrier, a method for producing the same, and a method for producing the ferrite carrier, in which a desired stable charge amount is obtained and the electrical characteristics including the charge amount are small in environmental fluctuations. The electrophotographic developer used is provided. A ferrite carrier core comprising ferrite particles having an apparent density of 2.30 to 2.80 g / cm 3 , a BET specific surface area of 0.09 to 0.70 m 2 / g, and an average circularity of 0.90 or more. Ferrite carrier core material for an electrophotographic developer having a Cl concentration of 0.1 to 100 ppm measured by an elution method, and an electrophotographic developer obtained by coating a resin on the surface of the ferrite core material A ferrite carrier, a production method thereof, and an electrophotographic developer using the ferrite carrier are employed. [Selection figure] None |