Fuji Xerox Co., Ltd.

Hiroshi Takano

Masanori Ichimura

Yasuo Matsumura

Masahiro Takagi

Yuka Ishihara

Michio Take

Masaki Hashimoto

Takashi Imai

Shuji Sato

Susumu Yoshino

Fumiaki Mera

Takao Ishiyama

Masaaki Suwabe

Akihiro Iizuka

Haruhide Ishida

Koji Fukushima

Hideyuki Akagi

Kazuya Furuta

Mamoru Yoshimura

Tetsuya Taguchi

Yasuo Kadokura

Yoshifumi Iida

Masanobu Ninomiya

Hiroshi Nakazawa

Hideo Maehata

Koutarou Yoshihara

Hidekazu Yaguchi

Yasuhiro Oya

Takahiro Mizuguchi

Rieko Kataoka

Yuusaku Shibuya

Satoru Ishigaki

Kensaku Togao

A method for forming an electrostatic latent image developing toner including mixing in a stirring tank a resin particle dispersion with at least a colorant particle dispersion prepared by dispersing a colorant and in some cases with a release agent particle dispersion prepared by dispersing a release agent; aggregating in the stirring tank the resin particles with the pigment particles and the release agent particles to form aggregate particles; and then conducting heating in the stirring tank to fuse the aggregate particles, wherein the method further comprises during a fusion step, suppressing with an accumulation suppression unit accumulation of aggregate particles. The accumulation suppression unit is a magnetic field forming unit that forms a magnetic field either continuously or intermittently. The toner has an average sphericity of at least 0.94 but no more than 0.98 and particle characteristics as defined in the specification.

Electrostatic latent image developing toner, electrostatic latent image developer, image forming apparatus, and apparatus for manufacturing electrostatic latent image developing toner

A toner for developing an electrostatic image, a process for producing the same, a developer for developing an electrostatic image and a process for forming an image are disclosed. The toner contains a resin, a colorant and a releasing agent, in which the toner has protrusions having a height of about from 0.05 to 2 &#x3bc;m, a part of the protrusions encompasses the releasing agent, and a proportion of elements derived from the releasing agent is about 10% by atom or less based on elements on a surface of the toner that is quantitatively determined by X-ray photoelectron spectroscopy.

Toner for developing electrostatic image, process for producing toner for developing electrostatic image, developer for developing electrostatic image, and process for forming image

Provided are a toner and its production, a developer, an image forming method and an image forming apparatus. The toner has excellent fixation characteristics of good releasability, hot offset resistance, folding resistance, surface glossiness, and OHP transparency. The toner contains a binder resin, a colorant, a release agent and an inorganic particles. The inorganic particles therein contain inorganic particles (A) having the mean primary particle size not less than approximately 5 nm and less than approximately 30 nm and inorganic particles (B) having the mean primary particle size not less than approximately 30 nm and less than approximately 200 nm.

Toner for developing electrostatic image, method for producing the same, electrostatic image developer, method for forming image and image forming apparatus

An electrophotographic magenta toner which comprises a binder resin and a colorant comprising (a) 0.5 to 15 parts by weight of C.I. Pigment Red 57:1 and (b) 0.5 to 15 parts by weight of C.I. Pigment Red 81 or C.I. Pigment Red 122, per 100 parts by weight of the toner. A magenta developer comprising the magenta toner, and a full color image forming method using the magenta toner or developer are also disclosed.

Magenta toner for electrophotography, magenta developer for electrophotography, and image forming method using the same

A full color electrophotographic toner including toner particles containing at least a binder resin, a colorant and a wax, and external additives, at least one of the external additives being rutile titanium oxide having a volume resistivity of 1&times;10 to 1&times;10 &OHgr;cm, and a dispersion absolute deviation a of rutile titanium oxide being 0.17 or less, and a full color electrophotographic developer and an image forming method using the same are provided. In the full color electrophotographic toner, the full color electrophotographic developer and the image forming method of the invention, a retransfer phenomenon of the transferred toner can be prevented, a chargeability and a transferability are not problematic at all, a charging amount of the toner in long-term use can be rendered appropriate and stable, and a fluidity is also excellent.

Full color electrophotographic toner, full color electrophotographic developer and image forming method

Full-color toner cartridge, method for supplying toner from cartridge and method for filling toner cartridge with toner

In an image forming method having the step of developing an electrostatic latent image on an electrostatic latent image carrying member using a toner layer on a developer carrying member, the step of transferring the developed toner image onto a belt transfer body,which is a first transfer body, and the step of transferring the toner image formed on the belt transfer body,onto a second transfer body,the surface resistance of the belt transfer body,is 10,to 10,&OHgr;&middot;cm, the toner is composed of at least resin particles containing a binding resin and a coloring material, and an additive, and the additive contains particles whose volume resistance is 10,to 10,&OHgr;&middot;cm.

Image forming method

The present invention provides an electrostatic image developer comprising a toner and a carrier wherein the toner includes toner particles having an average particle diameter of 3 to 9 .mu.m, a hydrophobic silica microparticles having a BET specific surface area of 40 to 120 m.sup.2 /g, and a hydrophobic titanium compound microparticles having a BET specific surface area of 40 to 250 m.sup.2 /g; and wherein the carrier is a resin coated carrier having a coating layer of a resin. The electrostatic image developer can improve the environmental dependency of charging, power fluidity, resistance to caking of a toner and reduced change in charging with time course to provide an image with an excellent image quality for a long period of time.

Electrostatic charge image developer, image formation method and image

An electrostatic-image developer which comprises: (i) a toner comprising: (a) toner particles containing carbon black in an amount of from 6 to 8% by weight based on the weight of the toner particles and having a volume-average particle diameter of from 3 to 9 .mu.m; and (b) an external additive; and (ii) a resin-coated carrier having a volume resistivity of from 10.sup.7 to 10.sup.11 .OMEGA..multidot.cm in an electric field of 10.sup.3.8 V/cm and an average particle diameter of from 30 to 60 .mu.m. Also disclosed are a process for forming a black image and a process for forming a full-color image each using the electrostatic-image developer.

Electrostatic-image developer and image forming process

A toner for electrostatic-image development which comprises toner particles comprising a colorant and a binder resin, the toner particles having a volume-average particle diameter of from 3 to 9 .mu.m and a particle size distribution satisfying the following expressions (1) and (2):

Toner for electrostatic-image development, developer for electrostatic

The toner for full-color image formation of the invention comprises a binder resin and a colorant, wherein the toner has a volume-average particle diameter of from 3.0 to 9.0 .mu.m and satisfies relationship (1) between the volume-average particle diameter and a colorant content thereof:

Toner for full-color image formation, developer composition, and method

A carrier for developing an electrostatic latent image, which carrier comprises core particles having formed thereon a resin coating layer, in which the resin coating layer comprises a fluorine-containing resin and a second resin having a softening point lower than that of the fluorine-containing resin, and the resin and the second resin each are partially exposed on the surface of said resin coating layer. The carrier may be produced by a process comprising the steps of: dry-blending core particles, a fluorine-containing resin, and a second resin having a softening point lower than that of said fluorine-containing resin; and melting the resin blend to coat said core particles. The carrier is excellent in stability with time and environmental changes, causes no adhesion, and is less consumed.

Carrier for developing electrostatic latent image and process for

Growing community of inventors

Minami-ashigara, Japan

Hiroshi Takano