Toner production process.

摘要

The present invention provides a process for producing toner comprising a step of melting and kneading a mixture containing at least a binder resin and a colorant, a step of cooling the kneaded mixture, a step of pulverizing a cooled mixture using a pulverizing means and producing a pulverized mixture, a repeated step of classifying the pulverized mixture into coarse powder and fine powder using a pneumatic classifying means, and further pulverizing classified coarse powder using a pneumatic impact pulverizing means and producing fine powder material, and a step of using the classified fine powder to produce toner for developing electrostatic images, wherein the pneumatic pulverizing means has an accelerating tube, back end of which opposite a pulverizing chamber is provided with a pulverization powder feed port and a high pressure gas ejection nozzle which are concentrically arranged. <IMAGE>