Patent ID: 8889327

Claim:
A toner for developing electrostatic images, manufactured by mixing a binder resin with a colorant, a charge control agent, a release agent, and melt-kneading, the resulting mixture comprising: the binder resin, the colorant, the release agent, and the charge control agent; the binder resin is a polyester resin, wherein the polyester resin is a mixture of an amorphous polyester resin and a cross-linked polyester resin and the ratio of the amorphous polyester resin to the cross-linked polyester resin is from 30:70 to 50:50; the release agent contains a wax having a polar group; and the toner for developing electrostatic images has tan δ of 1 to 2 at a temperature of 80 to 145° C. as measured with a viscoelasticity measuring apparatus at a frequency of 10 Hz and a shear stress of 500 Pa, and has a breaking point of 180° C. or less in a temperature-tan δ curve.