Fujifilm Business Innovation Corp.

Fuji Xerox Co., Ltd.

Yuji Isshiki

Kazuhiko Nakamura

Daisuke Noguchi

Hiroshi Nakazawa

Daisuke Tomita

Takashi Inukai

Takahisa Tatekawa

Keita Yamamoto

Takahiro Yamashita

Yuta Saeki

Takashi Hara

Kazuya Mori

Satoshi Yoshida

Atsushi Sugawara

Takao Ishiyama

Yoshimasa Fujihara

Michio Take

Eiji Kawakami

Takahiro Mizuguchi

Junichi Tomonaga

Hitomi Akiyama

Akitsugu Seto

Kenji Higashi

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,

Toner manufacturing method and toner

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/mor more and 6.0 kW/mor less per unit volume, and the preparing method satisfies the following Requirement (1), in which

Preparing method of electrostatic charge image developing toner, electrostatic charge image developing toner, and electostatic charge image developer

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.

Method for producing toner for developing electrostatic charge image, and toner for developing electrostatic charge image

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.

Method for producing resin particle dispersion, method for producing toner for electrostatic image development, and toner for electrostatic image development

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.

Method for producing toner for developing electrostatic charge image, toner for developing electrostatic charge image, and electrostatic charge image developer

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.

Method for producing toner for electrostatic charge image development, toner for electrostatic charge image development, and electrostatic charge image developer

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.

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&#xb7;s to 3,800 Pa&#xb7;s at 100&#xb0; C.

Electrostatic-image developing toner, electrostatic image developer, and toner cartridge

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 R, R, R, and Ris selected from the group consisting of H, CH, and Cl, Rand Rare different from each other, and Rand Rare different from each other. Formula (2): 

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Kanagawa, Japan

Yuji Isshiki