Electrophotographic toner and method of producing same

A toner for developing an electrostatic image, comprising toner particles each containing at least a colorant and a resin, and an external additive present on each of said toner particles, wherein the water wettability of said toner particles from which greater than 0% and not greater than 50% of said external additive is removed is W50, wherein the water wettability of said toner is W100, and wherein (W100−W50)/W100 is not greater than 0.3.

A toner for developing an electrostatic image, comprising toner particles each containing at least a colorant and a resin, and an external additive present on each of said toner particles, wherein the water wettability of said toner particles from which greater than 50% and not greater than 70% of said external additive is removed is W30, wherein the water wettability of said toner is W100, and wherein (W100−W30)/W100 is not greater than 0.3.

A method for producing a toner for developing an electrostatic image, comprising the steps of dispersing a solution or dispersion, formed by dissolving or dispersing a toner composition comprising at least a colorant and a resin in an organic solvent, in an aqueous medium to obtain a dispersion, removing said organic solvent from the thus obtained dispersion to obtain powder particles having a water wettability of W0, and mixing said powder particles with an external additive to obtain a toner having a water wettability of W100, wherein (W100−W0)/W100 is not greater than 0.3.

A method for producing a toner for developing an electrostatic image, comprising the steps of dispersing a solution or dispersion, formed by dissolving or dispersing a toner composition comprising at least a colorant and a resin in an organic solvent, in an aqueous medium containing a solid fine particle dispersing agent to obtain a dispersion, removing said organic solvent from the thus obtained dispersion to obtain powder particles having a water wettability of W0, and mixing said powder particles with an external additive to obtain a toner having a water wettability of W100, wherein (W100−W0)/W100 is not greater than 0.3.

A method for producing a toner for developing an electrostatic image, comprising the steps of dispersing a solution or dispersion, formed by dissolving or dispersing a toner composition comprising at least a colorant, a resin and a reactive prepolymer in an organic solvent, in an aqueous medium to obtain a solution or dispersion, subjecting said solution or dispersion to a polyaddition reaction with a compound having at least two functional groups capable of reacting with said reactive prepolymer to obtain a dispersion, and removing said organic solvent from the thus obtained dispersion to obtain powder particles having a water wettability of W0, and mixing said powder particles with an external additive to obtain a toner having a water wettability of W100, wherein (W100−W0)/W100 is not greater than 0.3.

A method for producing a toner for developing an electrostatic image, comprising the steps of dispersing a solution or dispersion, formed by dissolving or dispersing a toner composition comprising at least a colorant and a resin in an organic solvent, in an aqueous medium to obtain a dispersion, removing said organic solvent from the thus obtained dispersion to obtain powder particles having a water wettability of W0, and mixing said powder particles with charge controlling agent particles and external additive particles to obtain a toner having a water wettability of W100, wherein (W100−W0)/W100 is not greater than 0.3.