TWO-COMPONENT DEVELOPER

摘要

A two-component developer is at least consisted of a toner and a carrier. The toner is produced by mixing a dispersion of colorant-containing resin particles and a dispersion of wax-containing resin particles and coagulating to give colored particles, adding to the colored particles 0.2 to 2.0 percent by weight of a hydrophobic silica and 0.01 to 1.0 percent by weight of a hydrotalcite-like compound as external additives and then blending uniformly, and has a shape coefficient of 0.93 to 0.99. The carrier is consisted of magnetic particles which have a volume-average particle diameter of 20 to 100 micrometers and are coated with a silicone resin. The two-component developer can maintain a high friction electrification property and produce a bright sharp image for a long time.