Patent ID: 7713669
Filing Date: 2010-05-11
Classification: G03G

Abstract:
1. A toner for developing electrostatic images, comprising a binder resin and a colorant, the binder resin comprising a crystalline polyester resin and an amorphous resin, wherein: when, in differential scanning calorimetry of the toner according to ASTM D3418-8, the temperature of an endothermic peak derived from the crystalline polyester resin in a first heating process is defined as Tm1 (° C.), an endothermic quantity based on the endothermic peak in the first heating process is defined as ΔH1 (mW/g), and an endothermic quantity based on an endothermic peak in a second heating process is defined as ΔH2 (mW/g), Tm1 is 50 to 80° C., and ΔH1 and ΔH2 satisfy the relationship represented by the following Formula (1); when the softening temperature of the toner is defined as T Tm1 and T when the crystalline polyester resin has an ester concentration M represented by the following Formula (3) of 0.01 to 0.12: where K represents the number of ester groups in the crystalline polyester resin and A represents the number of atoms constituting a polymer chain of the crystalline polyester resin; the crystalline polyester resin includes an acid-derived constituent component derived from an aliphatic dicarboxylic acid and an alcohol-derived constituent component derived from an aliphatic diol; and an amount of content of the acid-derived constituent derived from the aliphatic dicarboxylic acid, among all other acid-derived components, is 80-100 mole % by constitution.