Patent ID: 6846603

Claim:
A color toner comprising a binder resin and a colorant, wherein A) the weight average molecular weight of the binder resin is in the range of from 6000 to 45000; B) the glass transition temperature (Tg) of the toner is in the range of from 40 to 70° C.; C) the loss tangent tan δ of dynamic viscoelasticity of the tone is in the range of from 0.1 to 2.5 in the temperature range of from the glass transition temperature (Tg) of the toner to the temperature at which the loss modulus (G″) is 1×10 5 Pa; and D) the toner comprises 3 to 20% by mass of an ester derivative of an alicyclic compound having at least 1 carboxyl group; and wherein the difference between the solubility parameter of the binder resin and the solubility parameter of the ester derivative is no more than 4.