Patent ID: 6720123
Filing Date: 2004-04-13
Classification: G03G

Abstract:
A process for producing a toner for developing electrostatic image comprising an agglomerate step wherein a dispersion liquid containing at least primary polymer particles and colorant particles is stirred in a stirring tank to agglomerate the particles to thereby obtain agglomerate of the particles and an aging step wherein the resultant agglomerate of the particles is kept at a temperature higher than the glass transition temperature of the primary polymer particles by 10Â° C. or more for a predetermined period of time to thereby fuse the particles, wherein the concentration of solid content C1 in the agglomerate step is 10 to 40% by weight, and the concentration of the solid content C2 in the aging step is in the range of 0.3C1&lE;C2&lE;0.8C1, wherein the primary polymer particles are those obtained by emulsion polymerization, and wherein the primary polymer particles obtained by emulsion polymerization contains 1000 to 3000 ppm, based on the polymer component therein, of residual monomers, and a pyrolytic free radical initiator is added to the dispersion liquid containing agglomerate of the particles in the aging step.