| 摘要 |
An electrophotographic developing agent including toner particles containing a binder resin, a colorant, a charge control agent and a release agent, and an external additive to be added to the surface of the toner particles, wherein the charge control agent is a light metal complex compound, the release agent is a solid fatty acid ester based material, and the amount of the release agent is 1.5 to 4.0% by weight based on total weight of the toner particles. An electrophotographic image forming apparatus applying the electrophotographic developing agent is also provided. The developing agent can distribute stable charges over long term by using a light metal complex as a charge control agent and 1.5 to 4.0% by weight of a solid fatty acid ester-based material as a release agent in preparing a toner. Further, according to the developing agent, excellent toner fusing property and developing property can be maintained. Therefore, toner durability can be enhanced due to control of contamination and scattering, and enhancement of developing efficiency, and thus high quality of images can be obtained.
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