Patent ID: 7001701
Filing Date: 2006-02-21
Classification: G03G

Abstract:
1. 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 toner 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 D) the toner comprises 3 to 20% by mass of at least one compound selected from the group consisting of a rosin-modified maleic acid and a styrene-maleic acid; and E) the molecular weight distribution of the binder resin, represented by Mw/Mn, which is the ratio of weight average molecular weight Mw to number average molecular weight Mn, is no more than 3.3.