Patent ID: 8431298

Claim:
A toner composed of toner particles containing at least a binding resin containing a polyester resin and a colorant, wherein the toner contains 10 ppm to 1500 ppm of a metal element selected from titanium, germanium and aluminum, and cyclic phenol sulfide represented by Formula (1) in the formula, X is a sulfur atom, an SO or SO 2 group; Z is a hydrogen atom, an alkyl group, a substituted alkyl group, an aralkyl group, an acyl group or an alkoxycarbonyl group; Y is a hydrocarbon group, a halogenated hydrocarbon group, a halogen atom, —SO 4 R 1 group or —SO 3 R 2 group, wherein R 1 and R 2 is a hydrogen atom, a hydrocarbon group or a metal atom, and plural Ys may be same or different; and n is an integer of 3 to 9, and wherein the toner particles have an average circularity of 0.950 to 0.980, a volume-based median diameter of 4.5 to 8.0 μm and a volume-based particle diameter dispersion degree (CV vol value) of 15 to 25.