Fuji Xerox Co., Ltd.

Fujifilm Business Innovation Corp.

Hiroshi Nakazawa

Masanobu Ninomiya

Shuji Sato

Takao Ishiyama

Yosuke Tsurumi

Takashi Imai

Atsushi Sugawara

Yoshifumi Iida

Daisuke Noguchi

Kazufumi Tomita

Kazuhiko Nakamura

Masanori Ichimura

Akira Matsumoto

Chiaki Suzuki

Katsumi Daimon

Eisuke Iwazaki

Yusuke Ikeda

Hirokazu Hamano

Yutaka Sugizaki

Michio Take

Yuji Isshiki

Toshiaki Murofushi

Shigeru Hayashi

Yasuo Matsumura

Satoshi Inoue

Susumu Yoshino

Daisuke Tomita

Hiroyoshi Okuno

Tomohito Nakajima

Yoshimasa Fujihara

Yuka Ishihara

Moegi Iguchi

Koutarou Yoshihara

Masahiro Uchida

Takeshi Shoji

Akihiro Iizuka

Toyofumi Inoue

Hiroe Okuyama

Jun Igarashi

Koichi Oyamada

Etsuo Tominaga

Yasuhiro Ohya

Yasuo Kadokura

Yasuo Yamamoto

Sakon Takahashi

Masahiro Takagi

Hideo Maehata

Masakazu Iijima

Toshiyuki Yano

Masaaki Suwabe

Kiyohiro Yamanaka

Shinpei Takagi

Hidekazu Yaguchi

Shinya Nakashima

Takahisa Fujii

Atsuhiko Eguchi

Hiroshi Takano

Susumu Saito

Eiji Kawakami

Tetsu Torigoe

Koji Fukushima

Kaori Ohishi

Hideyuki Akagi

Masaru Miura

Keita Yamamoto

Shigeo Aonuma

Yasuhiro Arima

Yuta Saeki

Masaki Hashimoto

Yoshimi Amagai

Kaori Oishi

Masayuki Takei

Mayuko Uda

A preparing method of an electrostatic charge image developing toner includes:

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

A preparing method of an electrostatic charge image developing toner includes: aggregating at least binder resin particles and release agent particles contained in a dispersion to form aggregated particles; heating and coalescing the aggregated particles to form coalesced particles; and filtering and cleaning the coalesced particles to obtain toner particles, in which before the aggregating or during the aggregating, a polymer dispersant is added to the dispersion in an amount of 0.01% by weight or more and 1.3% by weight or less with respect to a total weight of the obtained toner particles.

Preparing method of electrostatic charge image developing toner and electrostatic charge image developing toner

An electrostatic charge image developing toner includes a toner particle containing a binder resin and a releasing agent, and the following requirement (1) is satisfied in cross section observation of the toner particle: requirement (1): the number of a releasing agent domain having a long diameter of 500 nm or more and 1,000 nm or less is 7 or more on average per toner particle.

Electrostatic charge image developing toner, electrostatic charge image developer, method for producing electrostatic charge image developing toner, toner cartridge, process cartridge, image forming apparatus, and image forming method

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 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

An electrostatic image developing toner includes toner particles containing a binder resin. In a differential scanning calorimetry curve of the toner particles, Tg1 is 58&#xb0; C. or more and 68&#xb0; C. or less, and Tg1&#x2212;Tg2 is 20&#xb0; C. or more and 40&#xb0; C. or less, where Tg1 is a lowest onset temperature in an endothermic change during a first temperature increase, and Tg2 is a lowest onset temperature in an endothermic change during a second temperature increase.

Electrostatic image developing toner, method for producing electrostatic image developing toner, electrostatic image developer, toner cartridge, process cartridge, and image forming apparatus

A toner for developing an electrostatic charge image contains toner particles containing at least one binder resin, a release agent, and a coloring agent, and a cross-sectional image of the toner particles meets requirements (1) and (2): requirement (1), an average of ten or more domains, per toner particle, of the release agent have an area of 0.5% or more and 5.0% or less of the area of the toner particle; requirement (2), in a Voronoi tessellation generated from the centroids of the domains of the coloring agent, the mean area of the Voronoi cells is 0.020 &#x3bc;mor more and 0.060 &#x3bc;mor less, and the standard deviation of the areas of the Voronoi cells is 0.010 &#x3bc;mor less.

Toner for developing electrostatic charge image, electrostatic charge image developer, method for producing toner for developing electrostatic charge image, toner cartridge, process cartridge, image forming apparatus, and image forming method

A toner for developing an electrostatic charge image includes: an amorphous polyester resin; a crystalline polyester resin; and a releasing agent, an amount of the releasing agent in the toner being from 5 to 15% by weight; an amount of the releasing agent present at a surface of the toner being from 10 to 35% by weight; and the toner showing at least one endothermic peak in each of a temperature range from 45 to 60&#xb0; C., a temperature range from 65 to 80&#xb0; C., and a temperature range from 85 to 100&#xb0; C. in a temperature-rise process of differential scanning calorimetry of the toner.

Electrostatic charge image developing toner and method of producing the same, electrostatic charge image developer, toner cartridge, process cartridge, and image forming device

The invention provides an electrophotographic toner having a crystalline polyester resin; a non-crystalline polyester resin; a colorant; and a releasing agent. A resin (i), that is included in a toluene-soluble component of the toner and having a molecular weight of 30,000 to 100,000 as measured by gel permeation chromatography relative to polystyrene standards, has an acid value A. A resin (ii), that is included in a toluene-soluble component of the toner and having a molecular weight of 8,000 to 12,000 as measured by gel permeation chromatography relative to polystyrene standards, has an acid value B. A resin (iii), that is included in a toluene-insoluble component of the toner, has an acid value C. The acid values A, B, and C satisfy the inequation of B&#x3e;A&#x3e;C. The invention further provides an electrophotographic developer using the toner, a toner cartridge storing the toner, and an image forming method using the developer.

Electrophotographic toner, electrophotographic developer, toner cartridge, and image forming method

There is provided a toner for developing an electrostatic charge image including a binder resin, a colorant and a releasing agent, wherein the content ratio of particles having a number particle diameter of 4.5 &#x3bc;m or more and less than 7.5 &#x3bc;m and a circularity degree of 0.980 or more is in a range from about 5 number % to about 15 number %, and the content ratio of particles having a number particle diameter of not 7.5 &#x3bc;m or more and less than 15 &#x3bc;m and a circularity degree of 0.900 or more and less than 0.940 is about 5 number % or less.

Toner for developing electrostatic charge image, electrostatic charge image developer, toner cartridge, process cartridge, and image forming apparatus

An electrostatic-image-developing toner includes a phosphonic acid based sequestering agent.

Electrostatic-image-developing toner, method of producing the same, electrostatic image developer, image forming method and image forming apparatus

A toner for development of an electrostatic image includes at least a crystalline polyester resin and a colorant. The toner shows a dielectric loss index &#x2208;&#x2033; of 0.1 or less at 0.1 Hz and 500 V at 30&#xb0; C. and 90% RH.

Toner for development of electrostatic image, method for manufacturing the same, developer for development of electrostatic image, toner cartridge, process cartridge, and image forming apparatus

The present invention provides a toner for developing an electrostatic latent image comprising at least a core layer including at least a coloring agent and a first binder resin, and a shell layer for covering the core layer and including a second binder resin, wherein two local maximum values of the tangent loss (tan &#x3b4;) of the dynamic visco-elasticity are present in a temperature range of 90&#xb0; C. or less, with one of the local maximum values present in a range of less than 60&#xb0; C., and the other local maximum value present in a range of 60&#xb0; C. or more and 90&#xb0; C. or less. Moreover, a production method for the toner for developing an electrostatic latent image, a developer for developing an electrostatic latent image, using the toner, and an image forming method are provided.

Electrostatic latent image developing toner, production method thereof, electrostatic latent image developer, and image forming method

Growing community of inventors

Minami-ashigara, Japan

Hiroshi Nakazawa