A particle set for producing a printed matter includes: a chromatic color toner containing toner particles A; and pressure-responsive particles containing base particles B, in which the base particles B contain a styrene resin containing, as polymerization components, styrene and a vinyl monomer other than styrene, and a (meth)acrylate resin containing, as a polymerization component, a (meth)acrylate, a mass ratio of the styrene resin to the (meth)acrylate resin (styrene resin:(meth)acrylate resin) is 80:20 to 20:80, a difference between the lowest glass transition temperature and the highest glass transition temperature of the pressure-responsive particles is 30° C. or more, and when the toner particles A have a volume average particle diameter D50A and the base particles B have a volume average particle diameter D50B, the D50A and the D50B satisfy formula 1-1: 1.5 μm<(D50B−D50A).

A method for coating pigment particles is provided, the method comprising heating a polymer resin in a carrier fluid to dissolve the polymer resin, suspending in the carrier fluid the pigment particles to be coated; and effecting precipitation of the polymer resin from the carrier fluid, such that a coating of the resin is formed on the pigment particles.

A method for coating pigment particles is provided, the method comprising heating a polymer resin in a carrier fluid to dissolve the polymer resin; suspending in the carrier fluid white pigment particles to be coated; and cooling the carrier fluid at a rate of 2° C./hr or less to effect precipitation of the polymer resin from the carrier fluid such that a coating of the resin is formed on the pigment particles, thereby producing the white liquid electrophotographic ink composition.

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 contained in a distillation tank by reduced pressure distillation. During the reduced pressure distillation, the rate of pressure reduction in an environment in which the pressure inside the distillation tank is equal to or higher than vapor pressure and equal to or lower than (the vapor pressure+5 kPa) when the concentration of the organic solvent in the phase-inverted emulsion is in the range of 30% by mass or less to 1% by mass or more is from 0.01 kPa/min to 0.5 kPa/min inclusive until the pressure inside the distillation tank reaches a preset reduced pressure for the reduced pressure distillation.

A method for producing a resin particle dispersion includes: obtaining a phase-inverted emulsion by adding a neutralizer to a resin solution prepared by dissolving a resin having an acid value in an organic solvent to thereby neutralize the resin and then adding an aqueous medium to the resulting resin solution to subject the resin to phase inversion emulsification; and removing the organic solvent from the phase-inverted emulsion. In the course of obtaining the phase-inverted emulsion, a maximum agitation power per unit mass (kg) of the resin when the resin solution containing the aqueous medium added thereto is agitated to perform the phase inversion emulsification is from 0.4 W to 20 W inclusive.

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. The distillate collected in the reusable distillate storage tank A is delivered to the emulsification tank in at least one resin particle dispersion production line among the two or more resin particle dispersion production lines to reuse the distillate for production of a phase-inverted emulsion in the at least one resin particle dispersion production line.

A method for producing a toner for developing an electrostatic charge image includes aggregating at least resin particles contained in a dispersion to form aggregated particles; and heating and fusing the aggregated particles to form fused particles, in which, in the aggregating, aggregation is performed by taking out a portion of the dispersion containing the resin particles mixed in a stirring vessel, adding an aggregating agent aqueous solution thereto, passing the resulting mixture through a dispersing machine, and then returning the resulting mixture to the stirring vessel so as to circulate the dispersion, and when adding the aggregating agent aqueous solution, an aqueous solution containing an aggregating agent at a concentration of 0.1 mass % or more and 5 mass % or less is added at a flow rate q (L/min) such that a ratio of this flow rate q (L/min) to a flow rate Q (L/min) of the mixture returning from the dispersing machine to the stirring vessel is 0.01 or more and 0.1 or less.

A preparing method of an electrostatic charge image developing toner includes: mixing an amorphous resin particle dispersion containing amorphous resin particles and a crystalline resin particle dispersion containing crystalline resin particles to prepare a mixed dispersion containing the amorphous resin particles and the crystalline resin particles; aggregating the amorphous resin particles and the crystalline resin particles in the mixed dispersion to form aggregated particles; and coalescing the aggregated particles by heating a dispersion containing the aggregated particles to form toner particles, in which both a zeta potential of the amorphous resin particle dispersion and a zeta potential of the crystalline resin particle dispersion are negative values, and an absolute value of the zeta potential of the crystalline resin particle dispersion is smaller than an absolute value of the zeta potential of the amorphous resin particle dispersion.

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. The reduced pressure distillation is performed using a reduced pressure distillation device including: a distillation tank that contains the phase-inverted emulsion; a heating unit that heats a tank wall of the distillation tank by causing a heated fluid to flow inside the heating unit; and an agitating unit disposed inside the distillation tank, the agitating unit including an agitating shaft and one or plural gutter-shaped agitation impellers that are attached to the agitating shaft, rotate to agitate the phase-inverted emulsion, and draw up the phase-inverted emulsion to form a liquid film of the phase-inverted emulsion on a heat transfer surface of the distillation tank in a portion above a liquid level of the phase-inverted emulsion. The aqueous medium is added to the phase-inverted emulsion contained in the distillation tank during the reduced pressure distillation.

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) 0.85,   formula 2

K1=(Wb×100)/(A×Wr),   formula 3

2 K1≤K1≤16.5,   formula 4

K2=(Wc×100)/(A×Wr), and   formula 5

0.5≤K2≤5.5   formula 6