Patent ID: 7291434

Claim:
A toner for electrostatically charged image development comprising at least a binder resin, a colorant and a releasing agent, wherein the releasing agent satisfies the following equations (1) and (2): 0.1 ≦η*a ≦1.0 (1) 1.1 ≦η*b/η*a ≦3.5 (2) wherein η*a represents a complex viscosity (Pa·s) determined from a first dynamic viscoelasticity measurement at a measuring frequency of the releasing agent of 6.28 rad/s, η*b represents a complex viscosity (Pa·s) determined from a second dynamic viscoelasticity measurement at a measuring frequency of the releasing agent of 62.8 rad/s, each of the first and second dynamic viscoelasticities is measured in a temperature range from a temperature that is 15° C. lower than the melting point of the releasing agent to a temperature that is 15° C. higher than the melting point of the releasing agent; and the shapes of releasing agent particles observed under a transmission electron microscope comprise both rod-like and massive shapes, and the average diameter of the rod-like shapes and the massive shapes is within a range of about 200 to about 1500 nm.