Fuji Xerox Co., Ltd.

Akihiro Iizuka

Yosuke Tsurumi

Fusako Kiyono

Masanori Ichimura

Takashi Imai

Tetsuya Taguchi

Akira Matsumoto

Susumu Yoshino

Yoshifumi Iida

Koutarou Yoshihara

Hiroshi Nakazawa

Sakon Takahashi

Masahiro Takagi

Fumiaki Mera

Tsuyoshi Murakami

Yuka Ishihara

Michio Take

Taichi Yamada

Takeshi Shoji

Motoko Sakai

Hiroshi Takano

Yasuhiro Oya

Haruhide Ishida

Rieko Kataoka

Masaaki Takahashi

Masataka Konishi

Hirotaka Matsuoka

Shintaro Anno

Kunihiko Sato

Koji Nishimura

Tomohito Nakajima

Kazuhiko Arai

Nobumasa Furuya

Norihito Fukushima

Yasuaki Hashimoto

Moegi Iguchi

Atsumi Kurita

Daisuke Haruyama

Hidekazu Yaguchi

Mona Tasaki

Atsuhiko Eguchi

Yasuto Okabayashi

Soutaro Kakehi

Takahiro Yamashita

Masahiro Okita

Masaki Hashimoto

Kaori Oishi

Satoru Ishigaki

A carrier set for electrostatic charge image developer, includes: a first carrier that satisfies Expression (1); 160 mJ&#x2266;x&#x2266;200 mJ, and a second carrier that satisfies Expression (2); 210 mJ&#x2266;y&#x2266;250 mJ, wherein x is a total energy amount, which is measured by a powder rheometer, of a developer which is prepared by mixing the first carrier and a toner for measurement such that a weight ratio of the toner is 8% by weight based on the developer, and y is a total energy amount, which is measured by the powder rheometer, of a developer which is prepared by mixing the second carrier and the toner for measurement such that a weight ratio of the toner is 8% by weight based on the developer.

Carrier set for electrostatic charge image developer, electrostatic charge image developer set, and process cartridge

A fixing device includes a fixing rotary body that heats and pressurizes, together with a recording medium, toner having particle diameter of 4.5 [&#x3bc;m] or less and a softening point of 100 [&#xb0; C.] or higher and 125 [&#xb0; C.] or lower to fix the toner on the recording medium, a heating unit that heats the fixing rotary body, and a pressurizing unit that sandwiches and pressurizes the toner and the recording medium in a contact part formed by the fixing rotary body, wherein the maximum pressure in the contact part is equal to or more than 2.9&#xd7;10[Pa], the width of the contact part in a movement direction of the recording medium is equal to or more than 10 [mm], and the heating time of the toner in the contact part is equal to or more than 20 [msec].

Fixing device 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

An electrostatic charge image developer includes a toner containing an external additive and a carrier comprising a resin-coated layer formed on a surface of a core material. The average shape factor SF1 of the toner is from 125 to 135, the number of particles having shape factor SF1 of less than 125 is from 5% to 30% by number with respect to the total number of toner particles, the number of particles having shape factor SF1 of greater than 135 is from 5% to 30% by number with respect to the total number of toner particles, the scratch line width in a scratch strength test of the resin used in the resin-coated layer is from 80 &#x3bc;m to 200 &#x3bc;m, and the scratch depth is from 60 &#x3bc;m to 150 &#x3bc;m.

Electrostatic charge image developer, process cartridge and image forming apparatus

An electrostatic image developing carrier includes a ferrite particle and a resin layer that coats the ferrite particle, wherein a magnesium element content of the ferrite particle is from about 3.0% by weight to about 20.0% by weight; wherein a manganese element content of the ferrite particle is from about 0.2% by weight to about 0.8% by weight; and wherein a content of toluene is more than about 100 ppm and not more than about 2,000 ppm.

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

A carrier for developing an electrostatic latent image includes carrier particles, and the carrier particles include magnetic particles and a coating layer coating the surfaces of the magnetic particles. The BET specific surface area of the magnetic particles is 0.1300 m/g to 0.2500 m/g, and the difference in BET specific surface areas obtained by subtracting the BET specific surface area of the magnetic particles from the BET specific surface area of the carrier particles is 0.0300 m/g to 0.400 m/g.

Carrier for electrostatic latent image development, and developer for electrostatic latent image development, method of forming an image, developer cartridge for electrostatic latent image development, process cartridge and image forming apparatus using the same

An electrostatic image developing carrier including at least a core material and a coating resin layer which coats the surface of the core material, the resin layer comprising a thermoplastic resin having an alicyclic group, a thermal reduction in accordance with the TGA method being in the range of 0.5 weight % to 5 weight % of the whole of the carrier in the range of 100&#xb0; C. to 400&#xb0; C., and further an endothermic quantity of the whole of the carrier in accordance with the DTA method is in the range of 7 mJ/g to 40 mJ/g in the range of 100&#xb0; C. to 400&#xb0; C.

Electrostatic image developing carrier, electrostatic image developing developer, electrostatic image developing developer cartridge, process cartridge, and image forming apparatus

A carrier for developing an electrostatic charge image, including a core, and a coating layer including a resin and inorganic oxide particles that exhibit electroconductivity, by which the core is coated, wherein the inorganic oxide particles have, when they are aggregated, an aggregation size of, or when they are not aggregated, a primary particle size of, from 230 nm to 970 nm.

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

An electrophotographic carrier includes a magnetic core material and a resin layer that coats the magnetic core material, the resin layer comprising a resistance control agent and a polymer including a repeating unit derived from an alicyclic group-containing methacrylic ester, the resin layer including a monomer as a base material of the repeating unit in the polymer in an amount of from about 0.5% by weight to about 3.0% by weight relative to the total amount of the resin layer.

Electrophotographic carrier, electrophotographic developer, process cartridge and image forming device

An image forming apparatus, including a latent image-holding member, a developing unit, a transfer unit, a cleaning unit, and a recycling unit, wherein the developer includes a toner having an external-additive adhesiveness index SA in the range of approximately 50% to approximately 95% and: a carrier containing magnetic particles and a coating layer coating the surface of the magnetic particles and having a total energy of approximately 1,420 to approximately 2,920 mJ; or a carrier containing magnetic powder-dispersed particles and a coating layer coating the surface of the magnetic powder-dispersed particles and having a total energy of, approximately 890 to approximately 1,390 mJ.

Carrier for electrostatic image development, and image formation method and apparatus

An electrostatic image developer contains a toner and a carrier having a resin coating layer formed on the surface of a core material containing a ferrite component, wherein a ratio R/Ris from 0.88 to 0.92 where Ris the resistance value (&#x3a9;) of the developer having a toner concentration of 2 mass % in a state formed into a magnetic brush, at an applied voltage of 10V/cm, and Ris the resistance value (&#x3a9;) of the developer having a toner concentration of 12 mass % in a state formed into a magnetic brush, at an applied voltage of 10V/cm.

Electrostatic image developer, process cartridge, and image forming apparatus

The invention provides a toner for developing electrostatic charged images comprising toner mother particles containing a binder resin and a colorant, and an external additive, wherein: the average of shape factors SFof the toner mother particles represented by the following Formula (1) is 140 or less; the external additive contains higher alcohol particles having a volume-average particle diameter of 1 to 12 &#x3bc;m; and the content of the higher alcohol particles having a diameter equal to or less than the volume-average particle diameter of the toner mother particles is in a range of 0.15 to 2.5 parts by weight with respect to 100 parts by weight of the toner mother particles. In addition, the invention provides a developer for developing electrostatic charged images comprising the toner. Further, the invention provides an image forming method using the toner.

Toner for developing electrostatic charged images and developer for developing electrostatic charged images, and image forming method using the same

A developer for a trickle developing method is used in formation of a full color image and is made of a mixture of a toner and a carrier. The toner contains inorganic fine particles as an internal additive and an external additive, a volume average particle diameter D of the toner is between 5.0 and 9.0 &mgr;m, a true specific gravity of the carrier is between 3.00 and 4.60, a volume average particle diameter of the carrier is between 15 and 60 &mgr;m, and the ratio of the volume average particle diameter of the carrier to the volume average particle diameter of the toner is between 3.00 and 7.00, and an image forming method using the developer. The developer for the trickle developing method prevents the embedding of the external additive in the toner by suppressing impact energy given by stirring the carrier and the toner in a developing device and a replenishment device of the developer, and has a resistance to toner degradation, an excellent transferability, a resistance to carrier contamination and a stable chargeability.

Developer and image forming method

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

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Kanagawa, Japan

Akihiro Iizuka