Abstract: A method for producing a toner for electrostatic charge image development includes: aggregating binder resin particles in a dispersion containing the binder resin particles to form aggregated particles; terminating growth of the aggregated particles by adding an alkaline aqueous solution to a dispersion containing the aggregated particles to increase a pH of the dispersion containing the aggregated particles; and fusing and coalescing the aggregated particles into toner particles by heating the dispersion containing the aggregated particles. Terminating the growth of the aggregated particles includes, while stirring the dispersion containing the aggregated particles, stepwise or continuously reducing a stirring power per unit volume.

Abstract: A method for producing an electrostatic image developing toner includes a step 1 of producing toner particles by a wet process, the toner particles including an amorphous polyester resin, a crystalline polyester resin, and a vinyl resin, and a step 2 of bringing acidic water into contact with the toner particles.

Abstract: Producing a resin particle dispersion using an apparatus including: two or more resin particle dispersion production lines each including an emulsification tank in which a resin is subjected to phase inversion emulsification using two or more organic solvents and an aqueous medium to obtain a phase-inverted emulsion, a distillation tank in which the organic solvents are removed from the phase-inverted emulsion by reduced pressure distillation to obtain a resin particle dispersion, and plural distillate collection tanks that collect distillates formed during the reduced pressure distillation according to respective target distillate compositions; and a reusable storage tank that collects and stores a distillate collected in at least one collection tank among the distillates collected in the plural collection tanks in each of the two or more production lines, and delivering the distillate to the emulsification tank in at least one production line to reuse the distillate for producing a phase-inverted emulsion.

Abstract: A toner manufacturing method includes a first step of filtering toner particles obtained by a wet manufacturing method, a second step of squeezing the toner particles and making water pass through the toner particles, and a third step of squeezing the toner particles and ventilating compressed air through the toner particles, in which Condition (1) and Condition (2) are satisfied, Condition (1): a temperature T of the water passing through the toner particles in the second step satisfies “10° C.?T?35° C.”; and Condition (2): a squeezing pressure P1 in the second step and a squeezing pressure P2 in the third step satisfy “0.2 MPa?P1<P2?0.8 MPa”.

Abstract: A method for producing an electrostatic image developing toner includes mixing toner particles containing an amorphous resin with additive particles. A mixing device used in the mixing includes a stirring vessel, a stirring blade, and a jacket configured to cool the stirring vessel, and condition (1) and condition (2) are satisfied. Condition (1): an internal temperature Ti of the mixing device in the mixing and a glass transition temperature Tg of the amorphous resin contained in a near-surface portion of the toner particles satisfy Tg?50° C.?Ti<Tg (inequality 1). Condition (2): 0.08? (Pm?P0)/w?0.50 (inequality 2) is satisfied. In inequality 2, Pm represents an average power (kW) of a motor for driving the stirring blade of the mixing device in the mixing, P0 represents an idling power (kW) of the motor, and w represents a total mass (kg) of the toner particles and the additive particles in the mixing device.

Abstract: A method for producing a resin particle dispersion includes using a resin particle dispersion production apparatus including: two or more resin particle dispersion production lines each including an emulsification tank in which a resin is subjected to phase inversion emulsification using two or more organic solvents and an aqueous medium to thereby obtain a phase-inverted emulsion, a distillation tank in which the organic solvents are removed from the phase-inverted emulsion by reduced pressure distillation to thereby obtain a resin particle dispersion, and plural distillate collection tanks that collect distillates formed during the reduced pressure distillation according to respective target distillate compositions; and a reusable distillate storage tank A that collects and stores a distillate collected in at least one distillate collection tank A among the distillates collected in the plural distillate collection tanks in each of the two or more resin particle dispersion production lines.

Abstract: A method for producing a resin particle dispersion includes: preparing a phase-inverted emulsion by phase inversion emulsification of a resin using a neutralizer, an organic solvent, and an aqueous medium; and removing the organic solvent from the phase-inverted emulsion to thereby obtain a resin particle dispersion. The acid value A of the resin is from 8 mg KOH/g to 20 mg KOH/g inclusive. The rate of neutralization of the resin with the neutralizer is 60% or more and less than 150%. The organic solvent contains at least one organic solvent B selected from the group consisting of esters and ketones and at least one organic solvent C selected from alcohols. In the phase-inverted emulsion, the acid value A of the resin, the mass Wr (kg) of the resin, the mass Wb (kg) of the organic solvent B, and the mass Wc (kg) of the organic solvent C satisfy relations represented by the following formulas 1 to 6: 30 (Wb+Wc)/(Wr/100) 250, ??formula 1 0.67 Wb/(Wb+Wc) 0.

Abstract: A method for producing a resin particle dispersion includes: preparing a phase-inverted emulsion by phase inversion emulsification of a resin using an organic solvent and an aqueous medium; and removing the organic solvent from the phase-inverted emulsion by reduced pressure distillation.

Abstract: A method for producing a toner for developing an electrostatic charge image includes aggregating at least resin particles and releasing agent particles contained in a dispersion to form aggregated particles; heating and fusing the aggregated particles to prepare a dispersion containing fused particles; and cooling the dispersion containing the fused particles to a temperature equal to or lower than a temperature 30° C. lower than an endothermic peak onset temperature derived from a releasing agent that constitutes the releasing agent particles, in which, in the cooling, the dispersion is cooled at a rate of 30° C./min or more and 130° C./min or less.

Abstract: A preparing method of an electrostatic charge image developing toner includes: aggregating binder resin particles in a dispersion containing the binder resin particles to form aggregated particles; and coalescing the aggregated particles by heating a dispersion containing the aggregated particles to form toner particles, in which the coalescing includes heating the dispersion containing the aggregated particles to 80° C. or higher so that a temperature of the dispersion containing the aggregated particles reaches 80° C., and then adding an acid and a surfactant to the dispersion containing the aggregated particles.

Abstract: A method for producing a toner for developing an electrostatic charge image includes: performing first aggregation that involves aggregating at least resin particles and releasing agent particles contained in a dispersion to prepare a dispersion A containing first aggregated particles; performing second aggregation that involves adding a dispersion B containing shell resin particles to the dispersion A and aggregating the shell resin particles to form second aggregated particles; and heating and fusing the second aggregated particles to form fused particles. A total of 40 mmol or more and 190 mmol or less of a basic compound is added, per kilogram of toner particles to be obtained, from a time aggregation starts to terminate in the second aggregation to a time a temperature is elevated to a fusion temperature in the heating and fusing.

Abstract: A method for producing a toner for developing an electrostatic charge image includes: mixing at least one flocculant into a liquid dispersion containing binder-resin particles by adding the flocculant into the liquid dispersion containing binder-resin particles while circulating the liquid dispersion containing binder-resin particles between a stirring vessel and a disperser that applies a mechanical shear force; forming aggregated particles by heating the liquid dispersion with the flocculant therein after reducing the viscosity of the liquid dispersion; and forming toner particles by heating the liquid dispersion containing the aggregated particles and thereby making the aggregated particles fuse and coalesce.

Abstract: A preparing method of an electrostatic charge image developing toner includes: aggregating binder resin particles in a dispersion containing the binder resin particles to form aggregated particles; and coalescing the aggregated particles by heating a dispersion containing the aggregated particles to form toner particles, The aggregating includes stirring the dispersion in the aggregating at a required stirring power of 1.0 kW/m3 or more and 6.0 kW/m3 or less per unit volume, and the preparing method satisfies the following Requirement (1), in which Requirement (1): a viscosity of the dispersion during the stirring is 5 Pa·s or more and 50 Pa·s or less at a shear rate of 1/s, where the viscosity of the dispersion is measured at a sample temperature of 25° C. using a part of the dispersion as a sample.

Abstract: A method for producing a toner for electrostatic charge image development includes: aggregating binder resin particles in a dispersion containing the binder resin particles to form aggregated particles; terminating growth of the aggregated particles by adding an alkaline aqueous solution to a dispersion containing the aggregated particles to increase a pH of the dispersion containing the aggregated particles; and fusing and coalescing the aggregated particles into toner particles by heating the dispersion containing the aggregated particles. Terminating the growth of the aggregated particles includes, while stirring the dispersion containing the aggregated particles, stepwise or continuously reducing a stirring power per unit volume.

Abstract: An electrostatic-image developing toner contains toner particles containing a polyester resin having an acid value of from 10 mg KOH/g to less than 15 mg KOH/g. The toner particles have a surface with an acid value in a range from 0.3% to 1.7% of the acid value of the polyester resin. The toner particles have a melt viscosity of from 1,800 Pa·s to 3,800 Pa·s at 100° C.

Abstract: An electrostatic-image developing toner contains toner particles containing a polyester resin having an acid value of from 10 mg KOH/g to less than 15 mg KOH/g. The toner particles have a surface with an acid value in a range from 0.3% to 1.7% of the acid value of the polyester resin. The toner particles have a melt viscosity of from 1,800 Pa·s to 3,800 Pa·s at 100° C.

Abstract: An electrostatic latent image developing magenta toner includes at least quinacridone pigment, naphthol pigment, and a release agent. Colorant of the toner satisfies conditions (a) and (b): (a) an average primary particle size D50 of a quinacridone pigment represented by formula (1) and an average primary particle size D50 of a naphthol pigment represented by formula (2) are such that the average primary particle size D50 of the quinacridone pigment is smaller than the average primary particle size D50 of the naphthol pigment; and (b) the average primary particle size D50 of the quinacridone pigment is greater than 20 nm, and the average primary particle size D50 of the naphthol pigment is smaller than 200 nm. Formula (1): Here, each of R1, R2, R3, and R4 is selected from the group consisting of H, CH3, and Cl, R1 and R2 are different from each other, and R3 and R4 are different from each other.

Abstract: An electrostatic latent image developing magenta toner includes at least quinacridone pigment, naphthol pigment, and a release agent. Colorant of the toner satisfies conditions (a) and (b): (a) an average primary particle size D50 of a quinacridone pigment represented by formula (1) and an average primary particle size D50 of a naphthol pigment represented by formula (2) are such that the average primary particle size D50 of the quinacridone pigment is smaller than the average primary particle size D50 of the naphthol pigment; and (b) the average primary particle size D50 of the quinacridone pigment is greater than 20 nm, and the average primary particle size D50 of the naphthol pigment is smaller than 200 nm. Formula (1): Here, each of R1, R2, R3, and R4 is selected from the group consisting of H, CH3, and Cl, R1 and R2 are different from each other, and R3 and R4 are different from each other.