Method of producing toner for developing electrostatic images

A method of producing a toner for developing electrostatic images, the toner comprising a toner matrix particle having a core-shell structure, wherein

• the toner matrix particle comprising a core particle comprising an amorphous resin A and a crystalline material, and a shell comprising an amorphous resin B,
• the shell comprising a phase of the amorphous resin B that is not fused with the core particle at the interface, and
• the amorphous resin A differing from the amorphous resin B, the method comprising the steps of:
• Step I) dispersing at least the amorphous resin A and the crystalline material in an aqueous medium to prepare a dispersion, and adjusting a temperature of the dispersion to be equal to or higher than (a glass transition temperature (Tg-a) of the amorphous resin A+10)° C. and equal to or lower than (a melting point (Tm-c) of the crystalline material+10)° C., to prepare a core particle dispersion through coagulation and coalescence of at least the amorphous resin A and the crystalline material;
• Step II) cooling the core particle dispersion prepared in Step I to a temperature equal to or lower than the glass transition temperature (Tg-a) of the amorphous resin A;
• and
• Step III) adjusting a temperature of the core particle dispersion to be equal to or higher than (the glass transition temperature (Tg-a) of the amorphous resin A+5)° C. and equal to or lower than (a glass transition temperature (Tg-b) of the amorphous resin B+3)° C. after Step II, and then adding a dispersion of the amorphous resin B to the core particle dispersion.