TONER MANUFACTURING METHOD

摘要

A toner manufacturing method includes a first mixing process of mixing toner base particles, each of which contains a colorant, a crystalline resin, an amorphous resin, and wax with inorganic fine particles to obtain a mixture and a second mixing process of further mixing the mixture, in which, in both the mixing processes, a stirring unit for imparting mechanical impact force is used and the processing is performed at a specific processing temperature (° C.) with a specific stirring power (W/kg).

主权项

1. A toner manufacturing method, comprising:
a first mixing step of mixing toner base particles, each of which contains a colorant, a crystalline resin, an amorphous resin, and wax with inorganic fine particles to obtain a mixture; and a second mixing step of further mixing the mixture, wherein the first mixing step and the second mixing step are steps for performing the mixing using a mixing device having a stirring unit for imparting mechanical impact force in a container, and when a processing temperature in the first mixing step is indicated as T1 (° C.), a stirring power of the mixing device imparted to a unit mass of a coated material in the first mixing step is indicated as W1 (W/kg), a processing temperature in the second mixing step is indicated as T2 (° C.), and a stirring power of the mixing device imparted to the unit mass of a coated material in the second mixing step is indicated as W2 (W/kg), the following expressions (1), (2), (3), and (4) are satisfied,
TgA≦T1≦Tp  (1),TgA≦T2≦Tp  (2),3≦W2  (3)W2≦½W1  (4) wherein, in the expressions, Tp (° C.) shows an onset temperature of a maximum endothermic peak derived from the crystalline resin measured when the temperature is raised from 20° C. to 180° C. at a temperature rise rate of 10° C./min in differential scanning calorimeter (DSC) measurement in which the toner base particles are measurement specimens, and TgA (° C.) shows a glass transition temperature in a second temperature rise measured when the temperature is raised from 20° C. to 180° C. at a temperature rise rate of 10° C./min, the temperature is reduced to 20° C. at a temperature decrease rate of 50° C./min, and immediately after the cooling, the temperature is raised from 20° C. to 180° C. at a temperature rise rate of 10° C./min in the DSC measurement in which the toner base particles are measurement specimens.