Fuji Xerox Co., Ltd.

Other

Fujitsu Corporation

Seijiro Ishimaru

Yasushige Nakamura

Yoshimichi Katagiri

Shinichi Yaoi

Asafumi Fujita

Tomoaki Tanaka

Satoshi Takezawa

Sadaaki Yoshida

Mutsuo Watanabe

Toru Takahashi

Chiaki Suzuki

Sakon Takahashi

Daisuke Ishizuka

Norio Sawatari

Hiromichi Kobayashi

Yuji Sato

Michio Take

Yojiro Kumagae

Katsuji Ebisu

Makoto Fukuda

Tsuneo Watanuki

Tsuyoshi Itagoshi

Hiroyuki Sasaki

Yasuyuki Furuse

An electrostatic-image developing toner contains toner particles containing a polycondensate resin and hydrophobic external additive particles having a volume average particle size of about 40 to about 200 nm. The electrostatic-image developing toner has a difference between a half-fall temperature T1/2A and a half-fall temperature T1/2B of about 2.0&#xb0; C. to about 10&#xb0; C. The half-fall temperature T1/2A is measured with a flow tester after storage in an environment at 50&#xb0; C. and an absolute humidity of 16.5 g/mfor 2 hours. The half-fall temperature T1/2B is measured with a flow tester after storage in an environment at 50&#xb0; C. and an absolute humidity of 82.7 g/mfor 2 hours.

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

An electrostatic-image developing toner contains toner particles, each including a core particle and a shell layer disposed on at least a portion of a surface of the core particle. The core particle contains a first amorphous polyester resin containing structural units derived from a polycarboxylic acid and structural units derived from a polyol. About 5% by mass or less of the structural units derived from the polyol are structural units derived from a polyol containing a bisphenol-A backbone. The shell layer contains a second amorphous polyester resin containing structural units derived from a polycarboxylic acid and structural units derived from a polyol. About 50% by mass or more of the structural units derived from the polyol are structural units derived from a polyol containing a bisphenol-A backbone. The electrostatic-image developing toner has a water content of about 2.0% to about 5.0% by mass.

An image forming apparatus includes a developing unit that contains an electrostatic charge image developer which contains a carrier and an electrostatic charge image developing toner, wherein the toner includes toner particles which contain a polyester resin, which is a polycondensate of a polycarboxylic acid and a polyol, and has a glass transition temperature of 50&#xb0; C. to 70&#xb0; C., the polyol includes a polyol not having a bisphenol A structure in a range of 50% by weight to 100% by weight, and a melt viscosity A of the toner at 110&#xb0; C. after storage for 2 hours under the environment of absolute humidity of 82.7 (g/m) and a melt viscosity B of the toner at 110&#xb0; C. after storage for 2 hours under the environment of absolute humidity of 16.5 (g/m) each are in the ranges specified in the specification.

Image forming apparatus, electrostatic charge image developer, and electrostatic charge image developing toner

An electrostatic charge image developing toner includes a carbodiimide compound and a polyester resin prepared by subjecting an alcohol component and a carboxylic acid component to condensation polymerization, wherein the alcohol component includes an aliphatic polyol in an amount of 60 mol % to 100 mol %.

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

A positively chargeable two-component developer, including at least a toner and a carrier, wherein the toner contains a binder resin, a colorant, a wax, and a charge control agent, the binder resin contains at least a polyester resin and an addition polymerization resin grafted with a polyolefin, the wax and the addition polymerization resin grafted with a polyolefin are contained at a wax:addition polymerization resin grafted with a polyolefin ratio of from about 40:60 to about 80:20, and the carrier is a magnetic powder having a coating layer containing a methyl-containing silicone resin.

Positively chargeable two-component developer, image forming method, and image forming apparatus

A toner for electrophotography fulfilling both the fixability and the void resistance at high level, and forms a high-quality image. The toner for electrophotography contains: a binder resin; and a wax component which contains: a first wax having an endothermic peak in a temperature region of 60 to 90&#xb0; C., the endothermic peak occurring in the temperature-rising stage of a DSC curve determined by a differential scanning calorimeter, and having a molecular weight distribution (weight-average molecular weight (Mw)/number-average molecular weight (Mn)) of 1.5 or less, and substantially not containing a component having 500 Mw or less; and at least any of a second wax having an endothermic peak in a temperature region of 100 to 150&#xb0; C. and the molecular weight distribution of 5 to 20; and a third wax having an endothermic peak in a temperature region of 150 to 170&#xb0; C. and the molecular weight distribution of 1.1 or more.

Toner for electrophotography and developer for electrophotography using the same, process cartridge, apparatus for forming image, and method for forming image

An electrophotographic toner comprising a binder resin and a colorant, which is used in electrophotographic process employing a flash fixing system for fixation of a transferred toner image, wherein

Electrophotographic toner and image forming method

A toner has a surface to which a titanium black fine particle adheres, the titanium fine particle having a property of being changed in color from black to white by flash-light.

Toner and an image formation method

It is a toner for optical fixing which contains a binder resin, a colorant, and an infrared light absorbent, and the infrared light absorbent has a coloring opacity of 20 or less, and of phthalocyanine compound and/or naphthalocyanine compound.

Toner for optical fixing, manufacturing method therefor and image formation apparatus using it

A toner for electrophotography contains at least one kind of cyclic compound selected from cyclic oligomers and cyclic polymers substantially having no terminal group, and the image forming device includes at least an electrostatic latent image carrier, an electrostatic latent image forming means for forming electrostatic latent images on the electrostatic latent image carrier, a developing means for forming visible images by developing the electrostatic latent images containing a developing agent for electrophotography, and a transfer means for transferring the visible images to a transfer material. Thus, the present invention provides a toner for electrophotography capable of providing well-balanced electrostatic property and fixing property during the image forming process in order to form images of high quality in a stable manner, and an image forming device.

Toner for electrophotography, developing agent for electrophotography using the toner, image forming method, and image forming device

In a color toner for forming an image, comprising at least a binder resin and a colorant, light-absorbing fine composite particles comprising core particles and at least two coating layers having different refractive indexes laminated on the surface of the core particles or other IR-absorbing compounds such as an azulene compound having a specific structure are used as an infrared absorbing compound. The color toner is used in an electrophotographic color image forming apparatus using a photofixing system for fixing a toner image.

Image forming color toner, color image forming method and color image forming apparatus

There is disclosed a two-component developing agent for use in an mage formation based on electrophotography, which has high developability even at a high speed printing and good developability in the case of the image formation for a long period of time. The two-component developing agent includes a carrier comprising a magnetic particle and an insulating toner. A surface of the magnetic particle is coated with at least a resin. A mean particle size of the magnetic particle is between 30 and 90 &mgr;m and an aggregation degree of said carrier is between 2 and 15%.

Two component developing agent and an image forming apparatus by use of the same

An optical fixing toner includes an infrared ray absorbing agent which is made of one element or a mixture of a plurality of elements 5 selected from a group of elements consisting of oxides, sulfides, halides, complex salts and acid chlorides of lanthanoide.

Growing community of inventors

Kawasaki, Japan

Seijiro Ishimaru