Toner, method for producing the same, and process cartridge

A process cartridge comprising:

• a latent electrostatic image bearing member;
• and
• a developing unit,
• wherein the latent electrostatic image bearing member and the developing unit are integrally supported, and the process cartridge is detachably mounted to a main body of an image forming apparatus,
• wherein the developing unit contains a toner, which is supplied to a latent electrostatic image on the latent electrostatic image bearing member so as to form a toner image,
• wherein the toner contains:
• a binder;
• a colorant;
• and
• a wax having a molecular chain consisting of C—H bond and C—C bond,
• wherein the mass reduction of the wax at 165° C. is 10% by mass or less, and the total amount of the wax in the toner measured by a DSC method is 1% by mass to 8% by mass,
• wherein a ratio, Sbet/SF, of a BET specific surface area (Sbet) of the toner to an average circularity (SF) of the toner is 1.0 m2/g or more to less than 3.6 m2/g,
• wherein the toner is obtained through a process which comprises at least emulsifying or dispersing a toner material liquid in an aqueous medium containing a surfactant, and
• wherein the toner material liquid is a liquid containing toner-forming materials which comprise at least the binder, the colorant and the wax.

A method for producing a toner, comprising:

• emulsifying and dispersing a toner material liquid in an aqueous medium containing a surfactant so as to form a toner dispersion liquid;
• and
• heating the toner dispersion liquid at a temperature (T1) of 45° C. to 90° C. so as to treat a surface of a toner particle,
• wherein the toner comprises:
• a binder;
• a colorant;
• and
• a wax having a molecular chain consisting of C—H bond and C—C bond,
• wherein the mass reduction of the wax at 165° C. is 10% by mass or less, and the total amount of the wax in the toner measured by a DSC method is 1% by mass to 8% by mass,
• wherein a ratio, Sbet/SF, of a BET specific surface area (Sbet) of the toner to an average circularity (SF) of the toner is 1.0 m2/g or more to less than 3.6 m2/g, and
• wherein the toner material liquid is a liquid containing toner-forming materials which comprise at least the binder, the colorant and the wax.