ELECTROSTATIC CHARGE IMAGE DEVELOPING TONER, ITS PRODUCTION, ELECTROSTATIC CHARGE DEVELOPER AND IMAGE FORMING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a toner having excellent electrification characteristics, environmental dependence, cleaning property, transfer property, and small in grain size having a sharp grain size distribution. SOLUTION: This toner has <=1.26 average vol. particle distribution, 1.0 to 20 mgKOH/g acid value, <=3 wt.% content of a surfactant in the toner particle, and inorg. metal salt such as zinc chloride having two or more valences by >=10 ppm and <=1 wt.%. This toner is prepared by mixing a resin fine particle dispersion liquid and a coloring agent dispersion liquid, preparing an aggregate dispersion liquid by using an inorg. metal salt, and heating the liquid to higher than the glass transition temp. of the resin to melt and integrate the aggregates.