Fujifilm Business Innovation Corp.

Fuji Xerox Co., Ltd.

Takahiro Yamashita

Yukiaki Nakamura

Takahisa Tatekawa

Daisuke Tomita

Masaru Takahashi

Yoshimasa Fujihara

Yuji Isshiki

Yuta Saeki

Kazuhiko Nakamura

Yosuke Tsurumi

Shintaro Anno

Tsuyoshi Murakami

Norihito Fukushima

Yasuaki Hashimoto

Akihiro Iizuka

Takashi Hara

Kazuya Mori

Akitsugu Seto

Yuya Kato

A method for producing a toner for developing electrostatic charge images includes: preparing a first dispersion containing, dispersed therein, first aggregated particles containing a binder resin; preparing a second dispersion containing second aggregated particles dispersed therein, the second aggregated particles being prepared by attaching resin particles to surfaces of the first aggregated particles in the first dispersion; heating the second dispersion to a fusion temperature at which the second aggregated particles in the second dispersion are fused to each other; and holding the second dispersion at the fusion temperature. 20 mass % or more of a weak acid relative to the mass of the second aggregated particles is added to the second dispersion during the heating of the second dispersion or the holding of the second dispersion, or during the heating of the second dispersion and the holding of the second dispersion.

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

A method for producing an electrostatic charge image developing toner includes forming aggregated particles by aggregating at least resin particles in a dispersion liquid containing the resin particles, and fusing/coalescing the aggregated particles by heating an aggregated particle dispersion liquid containing a base having volatility and the aggregated particles dispersed therein in a fusion/coalescence tank which houses the aggregated particle dispersion liquid.

Method for producing electrostatic charge image developing toner

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 method for producing resin particles includes: mixing a binder resin and a dye at temperature T that satisfies formula (1) below to thereby obtain a mixture; and emulsifying the mixture, a basic compound, a water-based solvent, and a surfactant to thereby obtain a resin base particle dispersion:the melting point1 of the dye≤the temperature≤the thermal decomposition temperature2 of the binder resin.  Formula (1)

Method for producing resin particles and method for producing toner

A method for producing a resin fine particle includes dissolving or melting an oily mixture containing at least a polyester resin, a base, and a basic dye while applying a shearing force to the oily mixture, and emulsifying the dissolved or molten oily mixture by adding a surfactant and an aqueous medium while applying a shearing force to the dissolved or molten oily mixture to prepare a dispersion liquid of the resin fine particle. The resin fine particle includes the polyester resin and the basic dye, has a volume average particle diameter of 0.05 μm or more and 1 μm or less, and has a ratio of a concentration of the basic dye in a center of gravity portion of the resin fine particle to a concentration of the basic dye in a surface layer portion having a depth of 10 nm or less from a surface of the resin fine particle of 0.8 or more.

Resin fine particle, thermoplastic resin particle, and method for producing resin fine particle

A resin fine particle includes a polyester resin; and a basic dye, in which a volume average particle diameter of the resin fine particle is 0.05 μm or more and 1 μm or less, and a ratio of a concentration of the basic dye in a center of gravity portion of the resin fine particle to a concentration of the basic dye in a surface layer portion having a depth of 10 nm or less from a surface of the resin fine particle is 0.8 or more.

A white toner for electrostatic image development contains white toner particles that contain a binder resin and a white pigment and satisfy condition 1 below:

White toner for electrostatic image development, electrostatic image developer, toner cartridge, process cartridge, image forming apparatus, image forming method, toner set for electrostatic image development, and electrostatic image developer set

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

A carrier for developing an electrostatic charge image, including a core, and a coating layer including a resin and inorganic oxide particles that exhibit electroconductivity, by which the core is coated, wherein the inorganic oxide particles have, when they are aggregated, an aggregation size of, or when they are not aggregated, a primary particle size of, from 230 nm to 970 nm.

Growing community of inventors

Kanagawa, Japan

Takahiro Yamashita