Abstract: A developing device, including: a developer bearing member, which is disposed opposite to an electrostatic latent image bearing member and which bears thereon a developer for developing an electrostatic latent image formed on the electrostatic latent image bearing member and conveys the developer to a developing region, wherein the developer includes a toner and a carrier, the toner containing: a toner base containing a binder resin and a colorant; and an external additive, wherein the external additive contains coalescent particles each made up of a plurality of coalescing primary particles, and wherein a work function Wc of the carrier and a work function Ws of the developer bearing member satisfy a relationship of the following formula (1): Ws?Wc?0.

Abstract: A method for producing an electrophotographic toner including forming a toner base particle by emulsifying or dispersing a solution or dispersion of a toner material comprising a colorant, and any one of a binder resin and a binder resin precursor in an aqueous medium, and adding crystalline organic fine particles having an acid value of 20 mgKOH/g to 80 mgKOH/g into the aqueous medium, before, during or after the forming so as to attach the crystalline organic fine particles onto a surface of the toner base particle.

Abstract: A toner including: a binder resin containing a non-crystalline resin and a crystalline resin; a colorant; and, a releasing agent, wherein the releasing agent has a melting point of 55° C. to 80° C., and wherein the toner satisfies the following Expressions 1 and 2: (Expression 1): 20,000 Pa·s?G1?50,000 Pa·s; and (Expression 2): (G4/G2)/(G3/G1) 1.00, where G1 is a storage modulus, G2 is a loss modulus, G3 is a storage modulus and G4 is a loss modulus, and the storage modulus G1 and the loss modulus G2 are measured at 80° C. when the toner is heated from 70° C. to 150° C. and the storage modulus G3 and the loss modulus G4 are measured at 80° C. when the toner heated to 150° C. is cooled to 70° C.

Abstract: A toner including a binder resin containing an ester bond, and a releasing agent, wherein the releasing agent includes first C30-C50 alkyl monoester compound and second C30-C50 alkyl monoester compound, wherein the number of carbon atoms of the first C30-C50 alkyl monoester compound is different from that of the second C30-C50 alkyl monoester compound, wherein the amount of the first C30-C50 alkyl monoester compound is largest and the amount of the second C30-C50 alkyl monoester compound is second largest or same as the amount of the first C3OC50 alkyl monoester compound, wherein the amount of the first C30-C50 alkyl monoester compound is 30% by mass or more but less than 50% by mass to the releasing agent, and wherein the amount of the second C30-C50 alkyl monoester compound is 10% by mass or more but less than 50% by mass to the releasing agent.

Abstract: A toner obtained by a method for producing a toner, which includes dissolving or dispersing in an organic solvent a toner material containing at least a binder resin, and a dispersion liquid of a crystalline polyester resin, so as to prepare a solution or dispersion liquid of the toner material, emulsifying or dispersing the solution or dispersion liquid of the toner material in an aqueous medium, so as to prepare an emulsion or dispersion liquid, and removing the organic solvent from the emulsion or dispersion liquid, wherein the crystalline polyester resin is localized near a surface of the toner.

Abstract: A method for producing an electrophotographic toner including forming a toner base particle by emulsifying or dispersing a solution or dispersion of a toner material comprising a colorant, and any one of a binder resin and a binder resin precursor in an aqueous medium, and adding crystalline organic fine particles having an acid value of 20 mgKOH/g to 80 mgKOH/g into the aqueous medium, before, during or after the forming so as to attach the crystalline organic fine particles onto a surface of the toner base particle.

Abstract: A toner containing a fatty acid having 6 to 22 carbon atoms, and a binder resin, wherein the toner is obtained by a method for producing a toner, which contains dissolving or dispersing in an organic solvent the fatty acid having 6 to 22 carbon atoms, and a toner material containing at least the binder resin, so as to prepare a solution or dispersion liquid, emulsifying or dispersing the solution or dispersion liquid in an aqueous medium containing acrylic resin fine particles, so as to prepare an emulsion or dispersion liquid, and removing the organic solvent from the emulsion or dispersion liquid.