Fuji Xerox Co., Ltd.

Jun Igarashi

Tetsuya Taguchi

Masahiro Takagi

Motoko Sakai

Susumu Yoshino

Hirokazu Hamano

Hiroshi Nakazawa

Atsuhiko Eguchi

Yasuhiro Oya

Haruhide Ishida

Takashi Imai

Satoshi Inoue

Chiaki Suzuki

Katsumi Daimon

Koichi Sugiyama

Masanori Ichimura

Masato Mikami

Chisato Urano

Yuka Ishihara

Norihito Fukushima

Yutaka Sugizaki

Michio Take

Masahiro Uchida

Shinpei Takagi

Hidekazu Yaguchi

Kaori Ohishi

Sueko Sakai

Etsuo Tominaga

Yuusaku Shibuya

Masahiro Okita

Tomohiro Takeda

Masaki Hashimoto

Teruo Sakai, Legal Representative

Yusaku Shibuya

Toyohumi Inoue

Kouzou Ota

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 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

An electrophotographic toner contains at least a binder resin and a colorant, and log{[Cu]/[C]} satisfies the following equation (1):&#x2212;5.0&#x2266;log{[Cu]/[C]}&#x2266;&#x2212;3.5 &#x2003;&#x2003;(1)in which, [C] represents a carbon content (%) and [Cu] represents a copper content (%), measured with fluorescent X-ray. An electrophotographic developer containing the toner, a method for producing the toner, and a method for forming an image by using the toner are also provided.

Electrophotographic toner, process for producing the same, and process for forming image

An electrophotographic toner excellent in dispersibility of a colorant, excellent in fixing property at a low temperature and having a broad fixing latitude of good offset resisting property, and a process for producing the same, as well as an electrophotographic developer and a process for forming an image using the electrophotographic toner are provided. The electrophotographic toner is provided that contains a binder resin and a colorant, in which the binder resin contains a crystalline polyester containing a carboxylic acid of two or more valences having a sulfonic acid group as a monomer component, and a process for producing the same, as well as an electrophotographic developer and a process for forming an image using the electrophotographic toner are provided.

Electrophotographic toner, process for producing the same, electrophotographic developer, and process for forming image

Provided are a toner for electrophotography, a method for producing it, and a method of image formation with it. The toner fuses little in the apparatus where it is produced, and its productivity is high. The toner has good characteristics including charging characteristics and coloring characteristics, and the amount of coarse grains in the toner is small. The method for producing the toner includes a step of kneading at least a toner-forming material to prepare a kneaded mixture, a step of grinding and classifying at least the kneaded mixture to prepare toner grains, and a step of mixing at least an external additive in the toner grains. In the method, an inorganic oxide containing the same metal element at least for its core is added to the system in all of the kneading step, the grinding and classifying step and the external additive-mixing step.

Toner for electrophotography, method for producing it, and method of image formation

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

The toner for developing an electrostatic charge image comprises a colorant, a binding resin and a resin copolymer of aliphatic hydrocarbon and aromatic hydrocarbon having 9 or more of carbon atoms. Preferably, the toner further comprises a wax. The endothermic peak of the wax at DSC is preferably from 70 to 100.degree. C. The petroleum resin copolymer preferably has a ring and ball softening point of from 80 to 170.degree. C., and the binding resin is preferably a polyester resin. The weight ratio of the aromatic hydrocarbon monomer and the aliphatic hydrocarbon monomer of the petroleum resin copolymer is preferably from 99:1 to 50:50.

Toner for developing an electrostatic charge image, developing agent for

The present invention provides a long-life carrier for developing an electrostatic latent image to be used in such field of applications as electrostatic photography and electrostatic recording, a developer of an electrostatic latent image utilizing said carrier, a method for forming an image and an image forming apparatus by using said developer. By use of the foregoing qualities, a high-quality image can be obtained.

Developer of electrostatic latent image, carrier therefor, method for

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Kanagawa, Japan

Jun Igarashi