Patent ID: 6929894

Claim:
A toner comprising toner particles containing at least a binder resin, a colorant and a wax, and an external additive; said wax having, in its differential scanning calorimetry endothermic curve, a maximum endothermic peak at 55° C. to 80° C. within a range of temperature of from 30° C. to 160° C.; said maximum endothermic peak having a half width of from 2° C. to 7° C.; and said binder resin being composed chiefly of a polyester resin; said toner having: a dynamic elastic modulus at a temperature of 140° C., G′ 140 , of from 5×10 2 dN/m 2 to 1×10 5 dN/m 2 , and its ratio to a dynamic elastic modulus at a temperature of 170° C., G′ 170 , i.e., G′ 140 /G′ 170 being from 0.05 to 50; and in Soxhlet extraction of the toner by using tetrahydrofuran as a solvent, tetrahydrofuran-insoluble matter A of a binder resin component after 8 hours from the start of extraction being from 10% by weight to 20% by weight and tetrahydrofuran-insoluble matter B of the binder resin component after 24 hours from the start of extraction being from 1% by weight to 10% by weight; the ratio of the tetrahydrofuran-insoluble matter A to the tetrahydrofuran-insoluble matter B, B/A, being from 0.1 to 0.8.