Process for producing polymerization toner

The process for producing a polymerization toner according to claim 11 wherein a cross-linking agent is incorporated in said polymerizable-monomer composition in an amount of from 0.01 part by weight to 5 parts by weight based on 100 parts by weight of the polymerizable monomer.

A process for producing a polymerization toner, which comprises preparing a polymerizable-monomer composition which contains at least a polymerizable monomer and a colorant and does not contain any polymerization initiator, introducing the polymerizable-monomer composition into an aqueous medium to effect granulation, adding a polymerization initiator to the aqueous medium after the granulation has been completed, and then polymerizing the polymerizable-monomer composition having been granulated, to produce toner particles;

• said polymerization initiator being added to the aqueous medium over a period of from 5 seconds to 300 seconds, and the time T (second) taken to add the polymerization initiator and the number N of pass times per unit time (times/second) of a stirring blade used in the reaction satisfying the relationship of:
• 5≦T×N≦2,500.

A process for producing a polymerization toner, which comprises preparing a polymerizable-monomer composition which contains at least a polymerizable monomer and a colorant and does not contain any polymerization initiator, adding a polymerization initiatotor to an aqueous medium, introducing the polymerizable-monomer composition into the aqueous medium to effect granulation, and then polymerizing the polymerizable-monomer composition having been granulated, to produce toner particles;

• said polymerizable-monomer composition being introduced into the aqueous medium within 10 minutes after the polymerization initiator has been added, and the time T (second) taken to add the polymerization initiator being:
• 5.0×10−5≦T/t½≦1.0×10−2
• where t½ is the half-life period of the polymerization initiator at granulation temperature.