Patent ID: 8877417
Filing Date: 2014-11-04
Classification: G03G

Abstract:
1. A toner comprising toner particles, each of which comprises a colorant, a wax, and a binder resin, wherein the binder resin comprises a resin (a) mainly composed of a polyester unit, the resin (a) being a crystalline resin, wherein in measuring endothermic amount of the toner by a differential scanning calorimeter, an endothermic peak temperature (Tp) derived from the binder resin is in a range of 55° C. to 70° C., and wherein in measuring viscoelasticity of the toner, when a loss modulus G″[Pa] at a temperature T[° C.] is represented by G″ (T), G″(Tp−10) is in a range of 5.0×10 G″(Tp+10) is in a range of 5.0×10 the loss modulus G″[Pa] satisfies the following formulas (1) to (3): wherein the resin (a) is a block-polymer having a crystalline portion of a polyester resin and an amorphous portion of a polyurethane resin, the ratio of the unit forming the crystalline portion to the resin (a) is in a range of 50 to 90 percent by mass, and the content of the resin (a) in the binder resin in 70 percent by mass or more, and wherein a tetrahydrofuran (THF) soluble component of the toner has the number average molecular weight (Mn) of 8,000 to 30,000 and has the weight average molecular weight (Mw) of 15,000 to 60,000, both of which are measured by a gel permeation chromatography (GPC) and wherein the toner particles have been annealed in a temperature range from a first temperature to a second temperature for 5 to 24 hours, wherein