Ricoh Company, Ltd.

Maiko Kondo

Hiroto Higuchi

Fumihiro Sasaki

Naohito Shimota

Shigeru Emoto

Shinichiro Yagi

Toshiki Nanya

Masami Tomita

Bing Shu

Yasuaki Iwamoto

Hiroaki Matsuda

Hiroshi Nakai

Tomoyuki Ichikawa

Junichi Awamura

Takahiro Honda

Tadao Takikawa

Naohiro Toda

Hidetoshi Kami

Narihito Kojima

Hiroshi Nagame

Yoshiaki Kawasaki

Ryoichi Kitajima

Shinya Nakayama

Toshio Koike

Masayuki Yamane

Nozomu Tamoto

Tatsuya Niimi

Mitsuo Aoki

Kunihiro Ohyama

Atsushi Sampe

Yasushi Koichi

Katsuichi Ohta

Tokuya Ohjimi

Junichi Sano

Masahide Yamashita

Tadashi Kasai

Yutaka Takahashi

Koji Suzuki

Emi Kita

Junichi Terai

Mugijirou Uno

Takeyoshi Sekine

Kumi Hasegawa

Keiko Matsumoto

Satoru Miyamoto

Takeshi Orito

Yoshihiro Suguro

Hiroyuki Yoshikawa

Kazuyuki Yazaki

Hyou Shu

The present invention relates to toner compositions containing: toner particles made of: binder resin; colorant; and a wax which is dispersed in the toner particles, where the toner composition satisfies relationship (2): B&#x2266;394&#x2212;400A' when 0.950&#x3c;A&#x2032;&#x2266;0.965 (2) where A&#x2032; represents an average circularity of the toner composition, B represents a content of toner particles having a particle diameter not greater than 3 &#x3bc;m expressed in % by number, and a concentration of the wax at a surface of the toner particles is larger than a concentration thereof in the center of the toner particles.

Toner, developer and image forming apparatus

A coating liquid including an N-alkoxymethylated nylon and a solvent, wherein the N-alkoxymethylated nylon includes one or more ions in an amount of from 200 to 500 ppm based on a weight of the N-alkoxymethylated nylon or one or more alkylamines in an amount of from 15 to 100 ppm based on a weight of the N-alkoxymethylated nylon. A photoreceptor including an electroconductive substrate; a charge blocking layer located overlying the substrate; a moir&#xe9; preventing layer located overlying the charge blocking layer; and a photosensitive layer located overlying the moir&#xe9; preventing layer, wherein the charge blocking layer is formed using the coating liquid.

Coating liquid and electrophotographic photoreceptor prepared using the coating liquid

A toner composition including toner particles including at least a binder resin; and a colorant, wherein the toner composition satisfies at least one of the following relationships (1) and (2):B&#x2266;14 when 155&#x3c;A&#x2266;180; and&#x2266;0.6&#x2212;79 when 145&#x2266;&#x2266;155,&#x2003;&#x2003;(1)wherein A represents a shape factor SF-1 of the toner composition and B represents a content of toner particles having a particle diameter not greater than 3 &#x3bc;m; andB&#x2266;14 when 0.920&#x2266;A'&#x2266;0.950; and&#x2266;394&#x2212;400&#x2032; when 0.950&#x3c;&#x2032;&#x2266;0.965&#x2003;&#x2003;(2)wherein A&#x2032; represents an average circularity of the toner composition and B represents a content of toner particles having a particle diameter not greater than 3 &#x3bc;m.

A coating liquid for an intermediate layer of an electrophotographic photoconductor comprises at least one of alcohol solvents; and N-methoxymethylated nylon, in which the N-methoxymethylated nylon has solution viscosity within a range from 43 mPa&#xb7;s to 50 mPa&#xb7;s when dissolving into methanol at 30&#xb0; C. in a concentration of 20% by mass.

Coating liquid for intermediate layer in electrophotographic photoconductor, electrophotographic photoconductor utilizing the same, image forming apparatus and process cartridge for image forming apparatus

A toner for developing a latent electrostatic image including a base of toner particle which contains a binder resin and a coloring agent, and an external additive. Herein, a plurality of the base of toner particle has a volume average particle diameter (Dv) of 3 &#x3bc;m to 7 &#x3bc;m, a ratio (Dv/Dn) of the volume average particle diameter (Dv) to a number average particle diameter (Dn) is 1.01 to 1.25, a plurality of the base of toner particle contains 15% by number or less of the base of toner particle having a particle diameter of 0.6 &#x3bc;m to 2.0 &#x3bc;m, a plurality of the base of toner particle has a circularity of 0.930 to 0.990 on average, the binder resin contains a modified polyester resin, and the toner contains 0.3 parts by weight to 5.0 parts by weight of the external additive, relative to 100 parts by weight of the base of toner particle.

Toner for developing latent electrostatic image, container having the same, developer using the same, process for developing using the same, image-forming process using the same, image-forming apparatus using the same, and image-forming process cartridge using the same

An image forming method, includes: forming a latent electrostatic image on a latent electrostatic image carrier; developing the latent electrostatic image with a toner to thereby form a visible image; transferring the visible image to a recording medium; and fixing the image transferred to the recording medium. The latent electrostatic image carrier includes: a support, a photoconductive layer on the support, and a surface protective layer on the support. The surface protective layer includes a reactant made by cross-linking the following: an electric charge transporting material which comprises a reactive functional group, a cross-linking resin, and a fluorine surfactant. The toner comprises an inorganic fine particle which defines an effective inorganic fine particle amount in a range of 0.8% by mass to 3.0% by mass calculated from the following equation (1): 

Toner, developer, toner container and latent electrostatic image carrier, and process cartridge, image forming method, and image forming apparatus using the same

A toner composition including toner particles including at least a binder resin; and a colorant, wherein the toner composition satisfies at least one of the following relationships (1) and (2):B&#x2266;14 when 155&#x3c;A&#x2266;180; and&#x2266;0.6&#x2212;79 when 145&#x2266;&#x2266;155,&#x2003;&#x2003;(1)wherein A represents a shape factor SF-1 of the toner composition and B represents a content of toner particles having a particle diameter not greater than 3 &#x3bc;m; andB&#x2266;14 when 0.920&#x2266;'&#x2266;0.950; and&#x2266;394&#x2212;400&#x2032; when 0.950&#x3c;A&#x2032;&#x2266;0.965&#x2003;&#x2003;(2)wherein A&#x2032; represents an average circularity of the toner composition and B represents a content of toner particles having a particle diameter not greater than 3 &#x3bc;m.

An image forming method, includes: forming a latent electrostatic image on a latent electrostatic image carrier; developing the latent electrostatic image with a toner to thereby form a visible image; transferring the visible image to a recording medium; and fixing the image transferred to the recording medium. The latent electrostatic image carrier includes: a support, a photoconductive layer on the support, and a surface protective layer on the support. The surface protective layer includes a reactant made by cross-linking the following: an electric charge transporting material which comprises a reactive functional group, a cross-linking resin, and a fluorine surfactant. The toner comprises an inorganic fine particle which defines an effective inorganic fine particle amount in a range of 0.8% by mass to 3.0% by mass calculated from the following equation (1): where SF-2 denotes a shape factor of the toner.

An electrophotographic photoconductor includes an electroconductive substrate, a photoconductive layer arranged over the electroconductive layer with or without the interposition of an undercoat layer, and a surface top layer containing a crosslinkable resin arranged over the photoconductive layer, the photoconductive layer includes a charge generation layer containing a charge generating material, and a charge transport layer containing a charge transporting material, in which the surface top layer is substantially free from hydroxyl groups and residual uncured portions.

Electrophotographic photoconductor, preparation method thereof, electrophotographic apparatus and process cartridge

A toner comprising toner particles comprising a first binder resin; a second binder resin different from said first binder resin and having a glass transition temperature of from 40 to 55&#xb0; C.; a colorant; and a release agent, and a particulate resin material which is located on surface of the toner particles with a coverage of from 50 to 100%, and which has a glass transition temperature of from 50 to 90&#xb0; C., wherein a weight ratio (W/W) between the second binder resin (W) and the first binder resin (W) is from 5/95 to 40/60, and wherein a ratio (G'/G&#x2032;) between a storage modulus of the toner at 80&#xb0; C. (G&#x2032;) and a storage modulus at 180&#xb0; C. (G&#x2032;) is from 100 to 1,000.

Toner, developer including the toner, container containing the toner or the developer and method of producing the toner

A toner comprising toner particles comprising a first binder resin; a second binder resin different from said first binder resin and having a glass transition temperature of from 40 to 55&#xb0; C.; a colorant; and a release agent, and a particulate resin material which is located on surface of the toner particles with a coverage of from 50 to 100%, and which has a glass transition temperature of from 50 to 90&#xb0; C., wherein a weight ratio (W/W) between the second binder resin (W) and the first binder resin (W) is from 5/95 to 40/60, and wherein a ratio (G'80/G&#x2032;180) between a storage modulus of the toner at 80&#xb0; C. (G&#x2032;80) and a storage modulus at 180&#xb0; C. (G&#x2032;180) is from 100 to 1,000.

A toner for developing latent electrostatic images is in the form of particles prepared by dissolving or dispersing each component of a composition in an organic solvent to form a solution or dispersion, the composition containing at least a resin reactive with a compound having an active hydrogen group, a compound having an active hydrogen group, a coloring agent, a releasing agent, and a graft polymer C of a polyolefin resin A on which a vinyl resin B has been at least partially grafted; dispersing the solution or dispersion in an aqueous medium; reacting the reactive resin with the compound having an active hydrogen group; removing the organic solvent during or after the step of reacting; and washing and drying particles formed by removing the organic solvent.

Toner and developer for developing latent electrostatic images, and image forming apparatus

A toner is used in an image forming process employing a toner recycling system and contains at least a modified polyester resin, a coloring agent, and a releasing agent. The toner has a volume-average particle diameter Dv, a number-average particle diameter Dn and a shape factor SF-1, wherein Dv is in a range from 4.0 &#x3bc;m to 6.0 &#x3bc;m, the ratio Dv/Dn of Dv to Dn is in a range from 1.00 to 1.30, and the shape factor SF-1 is in a range from 140 to 200.

Toner and image forming apparatus using the toner

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Shizuoka, Japan

Maiko Kondo