Fuji Xerox Co., Ltd.

Michio Take

Masanori Ichimura

Takashi Imai

Satoshi Inoue

Yasuo Yamamoto

Susumu Saito

Koji Fukushima

Sakon Takahashi

Takao Ishiyama

Yutaka Sugizaki

Hiroshi Takano

Masaru Miura

Hideyuki Akagi

Masaki Hashimoto

Satoshi Yoshida

Yasuo Kadokura

Yutaka Saito

Hiroshi Nakazawa

Manabu Serizawa

Katsuyuki Kitajima

Yoshifumi Iida

Masahiro Takagi

Masakazu Iijima

Masaaki Suwabe

Yuka Ishihara

Akihiro Iizuka

Motoko Sakai

Hiroshi Takayama

Hidekazu Yaguchi

Eiji Kawakami

Masayuki Takei

Tetsuya Taguchi

Yasuhiro Uehara

Chiaki Suzuki

Susumu Yoshino

Shintaro Anno

Hirokazu Hamano

Shunsuke Nozaki

Tomohito Nakajima

Daisuke Ishizuka

Fumiaki Mera

Hiroshi Kamada

Norihito Fukushima

Masahiro Uchida

Koutarou Yoshihara

Shinpei Takagi

Takahisa Fujii

Seijiro Ishimaru

Toyofumi Inoue

Yasuhiro Oya

Yoshio Shoji

Haruhide Ishida

Takahiro Mizuguchi

Junichi Tomonaga

Rieko Kataoka

Yuji Isshiki

Jun Igarashi

Toshiaki Murofushi

Hitomi Akiyama

Etsuo Tominaga

Tomohiro Takeda

Kazuya Furuta

Takashi Hara

Kazuya Mori

Satoru Ishigaki

Kensaku Togao

Tomohiro Ohkawa

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

An electrostatic charge image developing toner includes toner particles that contain a colorant, a binder resin and a release agent, and an external additive, in which the external additive contains inorganic particles including an aliphatic alcohol having 5 or more carbon atoms and a melting point of 20&#xb0; C. or lower on the surfaces thereof.

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

An electrostatic charge image developing toner includes: toner particles; and an external additive having an average particle diameter of from about 70 nm to about 420 nm, an average circularity of equal to or less than about 0.9, and a standard deviation of the circularity of greater than 0.2.

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

A method of producing a carrier for electrophotography includes: covering a surface of a core particle with a coating layer including resin particles and a crosslinking resin in an uncrosslinked state present in spaces between the resin particles; and applying a mechanical impact from the outer surface of the coating layer before crosslinking of the crosslinking resin.

Method of producing a carrier for electrophotography and method of producing a developer for electrophotography

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 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

The invention provides a toner for developing electrostatic latent images containing at least a binder resin, a colorant, a releasing agent, and a graft polymer that has been made by graft polymerization of a resin matrix and a macromonomer including at least one group selected from the group consisting of a hydroxyl group, a hydroxyalkyl group, and a pyrolidonyl group, and a production method thereof. The invention further provides an electrostatic latent image developer using the toner, an image forming method using the toner, and an image forming apparatus.

Toner for developing electrostatic latent image and production method thereof, electrostatic latent image developer, image forming method, and image forming apparatus

An electrostatic latent image developing magenta toner includes at least quinacridone pigment, naphthol pigment, and a release agent. Colorant of the toner satisfies conditions (a) and (b): (a) an average primary particle size D50 of a quinacridone pigment represented by formula (1) and an average primary particle size D50 of a naphthol pigment represented by formula (2) are such that the average primary particle size D50 of the quinacridone pigment is smaller than the average primary particle size D50 of the naphthol pigment; and (b) the average primary particle size D50 of the quinacridone pigment is greater than 20 nm, and the average primary particle size D50 of the naphthol pigment is smaller than 200 nm. Formula (1): Here, each of R, R, R, and Ris selected from the group consisting of H, CH, and Cl, Rand Rare different from each other, and Rand Rare different from each other. Formula (2): 

Electrostatic latent image developing magenta toner, electrostatic latent image developer, toner manufacturing method, and image forming method

A toner for electrostatic latent image development containing at least a binder resin and a colorant, wherein [Fe]/[C] satisfies the following formula (1) where [C] indicates the carbon content (%) and [Fe] indicates the iron content (%) of the toner determined through X-ray fluorescence analysis,0.00005&#x2266;[Fe]/[C]&#x2266;0.0002. &#x2003;&#x2003;(1)

Toner for electrostatic latent image development, electrostatic latent image developer containing the toner, and image formation method using the developer

The present invention provides a tandem-type image forming method using a trickle developing system, wherein the average circularity of a toner contained in at least a supplementary developer used for appropriately supplying a developer to a developing device is in the range of 0.940 to 0.980. In the toner, the ratio of the number of particles having an average circularity of 0.970 or greater, in a particle diameter range of a toner circle-equivalent diameter&#xd7;3/5 or less, is 5% or less, and the ratio of the number of particles having an average circularity of 0.950 or less, in a particle diameter range of a toner circle-equivalent diameter&#xd7;7/5 or greater, is 10% or less.

Image forming method, image forming apparatus and toner cartridge

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

An electrophotographic image forming method includes a charging step, an exposure step, a developing step and a transfer step in the rotation of an electrostatic latent image bearing member, in which a process speed of the electrostatic latent image bearing member is 200 to 500 mm/sec, an outer diameter of the electrostatic latent image bearing member is 15 to 35 mm, an outer diameter of a developer bearing member is 10 to 25 mm, and a magnetic single component developer of which the residual magnetization in a measured magnetic field of 796 kA/m is 0.5 to 5.0 Am /kg is used as the developer. The electrophotographic image forming method can provide a good image quality without causing scattering of toner in downsizing, weight reduction of an electrophotographic apparatus and speed-up of an electrophotographic process.

Electrophotographic image forming method, electrophotographic image forming apparatus and electrophotographic image forming process unit

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

There is provided an electrostatic charge image developing toner comprising at least a binder resin, a coloring agent, and an aromatic hydrocarbon copolymer resin, wherein, in a toner particle, the percentage of dispersed aromatic hydrocarbon copolymer resin particles having a longitudinal diameter of 2.0 .mu.m or greater among the total number of dispersed aromatic hydrocarbon copolymer is 10% or less. The toner has superior effects of excellent grindability and not melting and adhering to apparatuses, without there being any adverse effect on basic abilities of the toner such as electrostatic charge property, fixing property, color, and the like.

Electrostatic charge image developing toner, electrostatic charge 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

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Kanagawa, Japan

Michio Take