Patent ID: 7776501

Claim:
A color toner comprising capsule toner particles each having a surface layer (B) mainly formed of a resin (b) on a surface of a toner base particle (A) containing at least a binder resin (a), a colorant, and a wax, wherein: (1) a temperature Tp at which a curve 1 obtained by plotting a temperature (° C.) on an axis of abscissa and a common logarithm (logG″) of a value obtained by dividing a loss modulus G″ (Pa) of the color toner by a unit (Pa) of the loss modulus on an axis of ordinate shows a maximum is present, and Tp satisfies a relationship of 40° C.≦Tp≦60° C.; (2) a temperature Ts at which a curve 2 obtained by differentiating the curve 1 with respect to the temperature twice shows a local minimum is present in a temperature range of Tp+10 (° C.) to Tp+40 (° C.); (3) when the loss modulus G″ at the temperature Ts in the curve 1 is represented by G″(Ts) and the loss modulus G″ at a temperature higher than the temperature Ts by 5° C. in the curve 1 is represented by G″(Ts+5), a ratio G″(Ts)/G″(Ts+5) is larger than 3.0; (4) the binder resin (a) is mainly formed of a polyester resin, and the resin (b) comprises a resin having an ester bond as a bond structure of a main chain; and (5) the resin (b) comprises a product of a reaction between a polyester having alcoholic hydroxyl groups at both terminals and a diisocyanate component.