JP2007140368A5 - - Google Patents

Claims (5)

In an electrostatic charge image developing toner comprising at least a binder resin, silica and wax as toner particle components, the melting point of the wax is 70 to 130 ° C., and the powder obtained by pulverization is heated in a floating state in a hot air flow By processing, when the cross section of the toner particles is observed with a transmission electron microscope having an elemental analysis function, the equivalent circle average diameter of the silica aggregate having an equivalent circle diameter of 0.05 μm or more is 0.1 to 0.7 μm. A toner for developing an electrostatic charge image. The electrostatic image developing toner according to claim 1, wherein at least silica and wax are melt-kneaded in a binder resin and pulverized after cooling . The silica has a BET specific surface area of 90 to 400 m ² / g, a silica content of 0.25 to 8% by weight, a wax content of 0.5 to 8% by weight, and the weight of the wax / silica. The electrostatic image developing toner according to claim 1, wherein the toner has a ratio of 0.5 to 2.0.   4. The electrostatic image developing toner according to claim 1, wherein the toner particles are spheroidized to have an average circularity of 0.930 to 0.980 by heat treatment in a floating state. In a manufacturing method of an electrostatic charge image developing toner in which at least a binder resin, a colorant and a wax are melt-kneaded, cooled, and then pulverized, and the powder obtained by pulverization is heated in a floating state in a hot air stream And 0.5% to 8% by weight of a wax having a melting point of 70 to 130 ° C., 0.25 to 8% by weight of silica having a BET specific surface area of 90 to 400 m ² / g, and the weight ratio of wax / silica is 0 A method for producing a toner for developing an electrostatic charge image, characterized by having a viscosity of 0.5 to 2.0.