Patent ID: 8288069

Claim:
A method for producing a toner which comprises toner particles each containing at least a binder resin and a wax, and an external additive, comprising: melt kneading a binder resin, a wax, and a polymer having a structure obtained by reacting a vinyl-based resin component and a hydrocarbon compound; cooling the molten kneaded product; pulverizing the cooled product coarsely and pulverizing the coarsely pulverized product with a mechanical type pulverizer; treating the surface of the resultant fine pulverized product with hot air, and then cooling the surface-treated product with cold air to provide toner particles, wherein a temperature of the hot air is 100Â° C. or higher and 450Â° C. or lower, a temperature of the cold air is âˆ’50Â° C. or higher and 10Â° C. or lower, and the cold air has an absolute moisture content of 5 g/m 3 or less; and adding the external additive to the toner particles, wherein the surface of the toner particles have an average surface roughness (Ra) measured with a scanning probe microscope of 2.0 nm or more and 25.0 nm or less; wherein the toner has a surface tension index I for a 45-vol % aqueous solution of methanol measured by a capillary suction time method and calculated from the following equation (1) of 5.0Ã—10-3 N/m or more and 1.0Ã—10-1 N/m or less: I=P Î±/( AÃ—BÃ— 106)â€ƒâ€ƒEq. (1) where I represents the surface tension index (N/m) of the toner, Pa represents a capillary pressure (N/m2) of the toner for the 45-vol % aqueous solution of methanol, A represents a specific surface area (m2/g) of the toner, and B represents a true density (g/cm3) of the toner.