Patent ID: 7964330
Filing Date: 2011-06-21
Classification: G03G

Abstract:
1. An electrophotographic resin-coated ferrite carrier having a carrier core coated with a resin, wherein a product of an apparent density ρ (g/cm 3 ), average particle size d (μm) and BET specific surface area S (m 2 /g) of the carrier core satisfies the following condition and wherein the ferrite carrier is produced according to a method comprising grinding, mixing and pelletizing ferrite raw materials; preliminarily baking the pellets at 900 to 1200° C.; grinding the preliminarily fired pellets; producing a slurry from the resulting particles; granulating the obtained slurry; baking the granules at 1100 to 1450° C. for 1 to 24 hours under an oxygen concentration of 0 to 21 vol. % to obtain a carrier core having an average particle size of 20 to 45 μm; and coating the obtained carrier core with a resin, wherein slurry particle sizes, D