Patent ID: 7267919
Filing Date: 2007-09-11
Classification: G03G

Abstract:
1. A toner comprising toner particles, each of the toner particles comprising at least a binder resin comprising a polyester resin as a main component, a wax, and a colorant, wherein in case of measuring a wettability of the toner with respect to a mixed solvent of methanol and water in terms of an optical transmittance at an optical wavelength of 780 nm, a methanol concentration of the mixed solvent is in a range of 45 to 65% by volume when the optical transmittance is 80%, and a methanol concentration of the mixed solvent is in a range of 45 to 65% by volume when the optical transmittance is 10%; a melt index (MI) of the toner measured at a temperature of 125° C. and a load of 5 kg is in a range of 0.1 to 10 g/10 min; the toner comprises a resin component insoluble to tetrahydrofuran (THF insoluble component) in an amount of 5 to 40% by mass based on a mass of the binder resin; and the toner comprises a tetrahydrofuran soluble component, and in case of measuring the tetrahydrofuran soluble component by gel permeation chromatography, a main peak is in a molecular weight region of 3,000 to 20,000, and a proportion of a component having a molecular weight of 10,000 or less in the tetrahydrofuran soluble component is 50% by mass or more in a chromatogram of the gel permeation chromatography.