Patent ID: 7666563

Claim:
A toner comprising: a binder resin, comprising at least one polyester resin in an amount of from 50 to 100% by weight; and a colorant, having the following formula (I): wherein the toner has a shape factor SF-1 of from 120 to 150 and a shape factor SF-2 of from 125 to 180; wherein the toner is manufactured by a method using an aqueous medium; wherein the method using an aqueous medium is a dissolution suspension method; wherein the dissolution suspension method comprises: dissolving or dispersing at least a polymer capable of reacting with an active hydrogen, which is a precursor of the binder resin, and the colorant, in an organic solvent to prepare a toner constituent mixture liquid, dispersing the toner constituent mixture liquid in an aqueous medium while subjecting the polymer to a reaction with a compound having an active hydrogen, to prepare a dispersion including toner particles, and removing the organic solvent from the dispersion, followed by washing and drying; and wherein the binder resin comprises a modified polyester resin and an unmodified polyester resin, and the polymer capable of reacting with an active hydrogen is a precursor of the modified polyester resin, and wherein a weight ratio of the modified polyester resin to the unmodified polyester resin is from 5/95 to 75/25.