Patent ID: 6929894
Filing Date: 2005-08-16
Classification: G03G

Abstract:
1. 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′ 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.