Toner for electrophotography

An image forming method, comprising:

• forming a visible image by attaching a toner on a surface of a photoreceptor on which an electrostatic latent image is formed;
• and
• transferring the visible image to a transfer material,
• wherein the toner is an electrophotographic toner comprises:
• a binder resin;
• a colorant;
• and
• a releasing agent,
• wherein a complex viscosity (η) is 4e2 Pa·s to 8e3 Pa·s at a temperature range of 120 to 160° C. and an angular velocity range of 1.6 to 10 rad/s, a rate of change of the complex viscosity within the temperature range is 165 to 185 Pa·s/° C. at 1.6 rad/s, and 70 to 80 Pa·s/° C. at 10 rad/s, a stress relaxation at a relaxation time of 0.05 to 0.3 seconds under the temperature range of 120 to 160° C. is 1.0 e3 to 4.5 e4 Pa, and a rate of change of the stress relaxation (ΔG/ΔT) within the temperature range is 785 to 1000 Pa/° C. at 0.05 seconds and 190 to 215 Pa/° C. at 0.3 seconds.

An image forming device, comprising:

• an organic photoreceptor;
• an image forming unit to form an electrostatic latent image on a surface of the organic photoreceptor;
• a toner accommodating unit to contain a toner;
• a toner supplying unit to supply the toner to the organic photoreceptor in order to develop the electrostatic latent image on the surface of the organic photoreceptor into a toner image;
• and
• a toner transferring unit to transfer the toner image from the surface of the organic photoreceptor to the transfer material,
• wherein the toner is an electrophotographic toner comprises:
• a binder resin;
• a colorant;
• and
• a releasing agent,
• wherein a complex viscosity (η) is 4e2 Pa·s to 8e3 Pa·s at a temperature range of 120 to 160° C. and an angular velocity range of 1.6 to 10 rad/s, a rate of change of the complex viscosity within the temperature range is 165 to 185 Pa·s/° C. at 1.6 rad/s, and 70 to 80 Pa·s/° C. at 10 rad/s, a stress relaxation at a relaxation time of 0.05 to 0.3 seconds under the temperature range of 120 to 160° C. is 1.0 e3 to 4.5 e4 Pa, and a rate of change of the stress relaxation (ΔG/ΔT) within the temperature range is 785 to 1000 Pa/° C. at 0.05 seconds and 190 to 215 Pa/° C. at 0.3 seconds.

An electrophotographic toner, comprising:

• a binder resin;
• a colorant;
• and
• a releasing agent,
• wherein at least one of the binder resin has a weight average molecular weight of 3,000 to 200,000 and a gel content of 1 to 10, and a content of the releasing agent is 1 to 4 parts by weight based on 100 parts by weight of the binder resin.