Fuji Xerox Co., Ltd.

Fujifilm Business Innovation Corp.

Motoko Sakai

Yoshifumi Iida

Susumu Yoshino

Takuro Watanabe

Tetsuya Taguchi

Yutaka Saito

Shuji Sato

Sakon Takahashi

Masahiro Takagi

Katsuyuki Kitajima

Jun Igarashi

Yosuke Tsurumi

Shintaro Anno

Teppei Yawada

Michio Take

Asafumi Fujita

Akihiro Iizuka

Kotaro Yoshihara

Sueko Sakai

Masaaki Usami

Seki Yamaguchi

Masaaki Takahashi

Kunihiko Sato

Koji Nishimura

Seiichi Takagi

Kazuhiko Arai

Nobumasa Furuya

Daisuke Haruyama

Mona Tasaki

Narumasa Sato

An electrostatic charge image developing toner includes toner particles having an average circularity of 0.96 to 1.00 and organic particles having an aspect ratio of 0.4 to 0.9 as an external additive.

Electrostatic charge image developing toner and electrostatic charge image developer

A carrier for developing an electrostatic charge image has magnetic particles and a resin coating that covers the magnetic particles and contains at least one lubricant. The resin coating has a dispersed phase of the lubricant and meets requirement (1). Requirement (1): the lubricant content in a top layer&#x3e;the lubricant content in a middle layer&#x3e;the lubricant content in a bottom layer The top, middle, and bottom layers are of the resin coating divided into three in the direction of thickness, and the lubricant content is the percentage area of the dispersed phase of the lubricant in a cross-section of the layer taken along the thickness thereof.

Carrier for developing electrostatic charge image, electrostatic charge image developer, and image forming apparatus

An electrostatic charge image developer includes a brilliant toner that includes a toner particle having an average equivalent circle diameter D longer than an average maximum thickness C and a carrier that includes a core particle and a coating layer which covers a surface of the core particle, wherein the coating layer contains a resin and a surfactant, and a content of the surfactant is in a range of 50 ppm to 200 ppm with respect to the entire weight of the carrier.

Electrostatic charge image developer, developer cartridge, and process cartridge

An electrostatic charge image developer includes a toner that includes a toner particle; and a carrier, wherein the toner particle contains a brilliant pigment, an exposed amount of the brilliant pigment contained in the toner particle is from 0.5% to 5%, the carrier has a core particle and a coating layer which covers a surface of the core particle, the coating layer contains a silicone resin and a siloxane oligomer, and a content of the siloxane oligomer is from 0.1 ppm to 500 ppm with respect to a total weight of the coating layer.

An electrostatic charge image developer includes an electrostatic charge image developing carrier containing a ferrite particle and an electrostatic charge image developing toner containing metallic particles whose resistance is from 10&#x3a9;cm to 10&#x3a9;cm in an electric field of 10,000 V/cm, wherein the electrostatic charge image developing carrier satisfies the following formula (1): 0.9&#x2266;R/R&#x2266;1.0 (1), wherein Rrepresents the resistance of the electrostatic charge image developing carrier in an electric field of 2,400 V/cm, and Rrepresents the resistance of the electrostatic charge image developing carrier in an electric field of 19,200 V/cm.

An electrostatic charge image developing toner includes a toner particles containing a binder resin and a metallic pigment and aliphatic acid metal salt particles as an external additive in an amount of from 0.1 parts by weight to 2.0 parts by weight with respect to 100 parts by weight of the toner particles, wherein the toner particles have an average circle equivalent diameter D longer than an average C of a maximum thickness of the toner particles.

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

A toner for developing an electrostatic image, including: toner particles containing at least a binder resin, a release agent, and a colorant; and an external additive having a volume average particle diameter (d) of from 70 nm to 400 nm, a ratio (d/&#x3c3;) of the volume average particle diameter (d) to a standard deviation (&#x3c3;) of a volumetric basis particle diameter of from 2.0 to 12, and an average circularity of from 0.5 to 0.9.

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

The invention provides a toner for electrostatic image development, containing a toner particle and external additive particles adhered to the surface of the toner particle, each of the external additive particles being constituted of plural irreversibly coalesced primary particles.

Toner for electrostatic image development, toner cartridge, process cartridge and image forming apparatus

A brilliant toner includes flake shape toner particles containing a binder resin and a flake shape metallic pigment. The brilliant toner further includes tabular particles containing a Ti element.

Brilliant toner, electrostatic charge image developer, toner cartridge, and process cartridge

An electrostatic image developer includes a toner containing an external additive having a volume-average particle size of about 80 to 400 nm and an average circularity of about 0.7 to 0.85. The developer is used in an image forming apparatus including an image-carrying member having a top surface layer containing fluorocarbon resin particles, and a developer-carrying member that faces the image-carrying member and carries an electrostatic image developer, in which a value obtained by dividing the amount of developer on the developer-carrying member [g/m] by a shortest distance between the image-carrying member and the developer-carrying member [&#x3bc;m] is about 0.8 to 1.8, and a peripheral velocity ratio of the developer-carrying member to the image-carrying member is about 1.5 to 5.0 or the developer-carrying member moves in a direction opposite to the image-carrying member in a facing portion.

Electrostatic image developer and image forming apparatus

A two-component developer includes: a toner; a carrier having a surface energy of from about 23 dyne/cm to about 37 dyne/cm; and an external additive having a shape factor SF1 of from about 130 to about 150 and a number-average particle diameter of from about 80 nm to about 1 &#x3bc;m; and an existence ratio A of the external additive on a surface of the toner and an existence ratio B of the external additive on a surface of the carrier satisfying the relationship of the following Expression 1: 0.04&#x2266;B/A&#x2266;0.4.

Two-component developer, developer cartridge, process cartridge, and image forming apparatus

The invention provides a toner for developing an electrostatic image including toner particles having a shape factor SFof 110 or more and including a binder resin, and particles of an external additive that adhere to the toner particles, wherein

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

A toner for developing an electrostatic image includes a toner particle to which particles of an external additive A having a number average particle diameter of from 7 nm to 200 nm and particles of an external additive B having a number average particle diameter of from 30 nm to 4000 nm have been externally added. The ratio of the number average particle diameter of the particles of the external additive B to the number average particle diameter of the particles of the external additive A is in a range of from 2 to 20. The particles of one of the external additive A or the external additive B are particles having a core material covered with an organic material containing hydrogen and nitrogen. The particles of the other one of the external additive A or the external additive B are SiOparticles.

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

The present invention relates to an image forming method including: a charging step; an electrostatic latent image forming step; a developing step; a transfer step; a fixing step; and a cleaning step, wherein an electrostatic latent image developing agent comprises a toner and a carrier, wherein particles which have a volume resistivity of at least 1&#xd7;10&#x3a9;cm and an average primary particle diameter of 50 nm or less has a higher covering ratio than other particles on the toner particle surfaces, a shape factor SFof the toner is in the range of from 100 to 140, the carrier is a resin coated carrier, and at least a coating resin layer comprises a positively charging resin and a quaternary ammonium salt compound.

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Kanagawa, Japan

Motoko Sakai