Patent ID: 10067435

Abstract:
An electrostatic charge image developing toner includes a particulate toner matrix containing a binder resin and an external additive. The binder resin includes an amorphous polyester resin, a crystalline resin, and an amorphous vinyl resin. A storage modulus G′0(t) measured before the toner is left and storage moduli G′Tm-10(t) and G′Tm-20(t) measured after the toner is left for three hours at temperatures (Tm-10)° C. and (Tm-20)° C., respectively, based on a melting point (Tm° C.) derived from the crystalline resin satisfy the relations represented by G′0(t)<G′Tm-10(t), G′0(t)<G′Tm-20(t), and G′Tm-10(x)/G′Tm-20(x)≤1.5 in a temperature range A for measurement where the storage modulus G′0(t) is 1.0×106 Pa or more. The value t represents any temperature (° C.) for measurement in the temperature range A for measurement; and the value x represents the temperature (° C.) for measurement having a maximum difference between the storage moduli G′Tm-10(t) and G′Tm-20(t).