ELECTROPHOTOGRAPHIC TONER

摘要

PROBLEM TO BE SOLVED: To obtain a toner which hardly causes changes in the functions such as electrification characteristics and hardly causes filming even when it is repeatedly used, by controlling the ratio of the average dispersion particle size of the wax in toner particles to the average particle size of at least one kind of fine particles externally added to a specified range. SOLUTION: The toner contains toner particles with dispersed wax as a release agent in a fixing resin and fine particles externally added to the toner particles. The average dispersion particle size Rw of the wax in the toner particles and the average particle size Rs of at least one kind of fine particles externally added are controlled to satisfy 0.5<=Rw/Rs<=4. By this constitution, the aggregate of the wax exposing on the surface of the toner particles has an almost same size as that of the fine particles externally added. The fine particles are embedded in the aggregate of the surface wax in almost 1:1 proportion and the fine particles keep the state that the particles are partly exposed to the outside from the wax and that the particles do not easily drop off even when the toner is repeatedly used by recycling.