Patent ID: 7323283

Claim:
A method of producing an electrostatic charge image developing toner, which comprises at least a binder resin and a colorant, by pulverization in a closed circuit, wherein a pulverized starting material is supplied quantitatively to a first mechanical pulverizer and then pulverized moderately therein, the resulting moderately pulverized material is supplied to a second mechanical pulverizer and pulverized finely therein, and the resulting finely pulverized material is introduced into a coarse-powder classifier to classify coarse powder not smaller than a predetermined particle diameter, the finely pulverized material from which coarse powder was removed by classification is further classified to remove fine powder not larger than a predetermined particle size and a classified product is obtained, while the separated classified coarse powder is introduced into a returning-powder feeder, the classified coarse powder introduced into the returning-powder feeder is quantitatively supplied again to the second mechanical pulverizer, upon which when it is detected that the weight of the coarse powder stored in the returning-powder feeder is deviated from a predetermined range, the amount of the returning coarse powder supplied to the second mechanical pulverizer is changed and regulated such that the quantitative supply of the coarse powder is conducted in such a changed amount, and the volume-average particle diameter D 1 (μm) of the moderately pulverized material obtained by the first mechanical pulverizer and the volume-average particle diameter D 2 (μm) of the finely pulverized material obtained by the second mechanical pulverizer satisfy the equation: 3 μm≦D 1 −D 2 ≦6 μm.