Canon Kabushiki Kaisha

Satoshi Otake

Masayoshi Shimamura

Yasutaka Akashi

Kazunori Saiki

Yasuhide Goseki

Kenji Fujishima

Naoki Okamoto

Minoru Ito

Kazuhito Wakabayashi

Takuma Matsuda

Atsushi Noguchi

Hironori Mori

Yoshiyuki Takayama

Michiko Orihara

Nene Dojo

Tatsuya Nakamura

Michihisa Magome

Daisuke Yoshiba

Eriko Yanase

Yusutaka Akashi

Yasutaka Akahashi

A developer carrying member is provided the surface layer of which can make a developer stable by controlling its triboelectric charging strongly and which can maintain a high image quality over a long period of time even where a developer made highly spherical-particle or a small-particle developer is used. The developer carrying member has a substrate and a surface layer. The surface layer is a cured product of a resin composition containing a binder resin, conductive particles, a quaternary ammonium salt and an azo metal complex compound, the binder resin has in the molecular structure at least one structure selected from the group consisting of an &#x2014;NHgroup, an &#x2550;NH group and an &#x2014;NH&#x2014; linkage, and the azo metal complex compound is a compound represented by the formula (1) as defined in the specification.

Developer carrying member, process for its production, and developing assembly

A developer carrying member is provided which can maintain a high image quality over a long period of time even where a highly triboelectrically chargeable developer is used. The developer carrying member has a substrate and a surface layer. The surface layer is a cured product of a resin composition containing a binder resin, conductive particles, a quaternary phosphonium salt and an azo metal complex compound, the binder resin has in the molecular structure at least one structure selected from the group consisting of an &#x2014;NHgroup, an &#x2550;NH group and an &#x2014;NH&#x2014; linkage, and the azo metal complex compound is a compound represented by the formula (1) as defined in the specification.

Provided is a developer carrying member that can stably provide a negatively chargeable developer with triboelectric charge and whose surface hardly wears even after its long-term use. The developer carrying member is a developer carrying member, comprising: a substrate; and a surface layer, wherein: the surface layer contains a matrix resin and electro-conductive particles; and the matrix resin contains a crosslinked product of a polymer chain having units represented by the following structural formula (1) and the following structural formula (2), and a polymer chain represented by the following structural formula (3). 

Developer carrying member and developing unit

A developer bearing member is provided which can charge a toner stably and uniformly during the period from the initial stage to the terminal stage of extensive operation even in various environments. The developer bearing member includes a substrate and an electrically conductive resin coating layer formed on the surface thereof. The electrically conductive resin coating layer is formed from a resin composition containing a phenolic resin having in its structure at least one of an &#x2014;NHgroup, an &#x2550;NH group and an &#x2014;NH&#x2014; linkage, a quaternary phosphonium salt and electrically conductive fine particles and the resin composition contains 1 part by mass or more and 60 parts by mass or less of the quaternary phosphonium salt with respect to 100 parts by mass of the phenolic resin.

Developer bearing member and process for producing same, development apparatus and development method

A developer carrying member having less environmental dependence is provided. The developer carrying member has a substrate and a resin layer, which resin layer contains an acrylic resin; the acrylic resin having a unit (1) represented by the following formula (1) and a unit (2) represented by the following formula (2). In the formula (1), Rrepresents a hydrogen atom or a methyl group, Rrepresents an alkylene group having 1 to 4 carbon atoms, and an asterisk * represents the part of linkage to the part shown by a double asterisk ** in the formula (2). In the formula (2), Rrepresents a hydrogen atom or a methyl group; Rrepresents an alkylene group having 1 to 4 carbon atom(s); R, Rand Reach represent an alkyl group having 1 to 18 carbon atoms; Arepresents an anion. 

Developer carrying member, method for its production, and developing assembly

The present invention relates to a developer carrying member which includes a substrate and the resin layer formed on the surface of the substrate, wherein the resin layer is obtained by thermally curing the coating material composition including at least the following (A) to (E): (A) a thermosetting resin as a binder resin; (B) an alcohol as a solvent, containing 1 to 4 carbon atoms; (C) a resin including the unit represented by the following formula (1); (D) graphitized carbon black having a graphite (002) lattice spacing of 0.3370 nm or more and 0.3450 nm or less as measured by X-ray diffraction; and (E) acid carbon black having a pH of 5.0 or less: 

Developer carrying member, and developing apparatus using same

The present invention provides a developer carrying member capable of maintaining excellent charge imparting property even under long-term use. The present invention relates to a developer carrying member including a substrate and a resin layer, wherein the resin layer includes an acrylic resin having three specific structural units and electroconductive particles.

Developer carrying member, method for manufacturing same and developing apparatus

A developer carrying member is provided which, even in continuous copying over a long term and also even under different environmental conditions, do not cause any charge-up of toner, and prevent the toner from melt-adherent to the developer carrying member surface and developer layer thickness control member surface to maintain the state of uniform coating of a developer having a toner and to make the toner uniformly and quickly triboelectrically charged, so as to obtain high-grade images free of any image density decrease, image density non-uniformity, sleeve ghosts, fog and vertical streaks during running service. Provided are a developer carrying member having a substrate and a resin coat layer on the surface of the substrate, which resin coat layer contains at least a binder resin and a carbon black, where the graphite (002) plane obtained from X-ray diffraction of the carbon black has a lattice spacing of from 0.3370 nm or more to 0.3450 nm or less; and a developing assembly having such a developer carrying member.

Developer carrying member and developing assembly

A developer carrying member and a developing assembly are provided which can stably provide the toner with triboelectric charges, may prevent any problems such as image density decrease, density non-uniformity and spots around images even during running on a large number of sheets, and can enjoy a stable and good developing performance. The developer carrying member has a substrate and a resin layer, and the resin layer containing a thermosetting resin, an acrylic resin having specific units and electroconductive particles.

A developer carrying member is disclosed which can stably provide toners with triboelectric charges even in various environments. The developer carrying member has a substrate and a resin layer as a surface layer formed on the surface of the substrate, and the resin layer contains a thermosetting resin as a binder resin, an acrylic resin having two units having specific structures, and conductive particles.

Developer carrying member and developing apparatus

A developing apparatus is provided which can suppress a fluctuation in image density in a discontinuous printing mode provided with a pause period. The developing apparatus includes a developer for developing an electrostatic latent image on a photosensitive drum, a developer bearing member for carrying and conveying the developer and a developer layer thickness-regulating unit placed close to the developer bearing member for regulating the amount of the developer carried and conveyed by the developer bearing member, the developer layer thickness-regulating unit being. As the developer, a negatively chargeable, one-component, magnetic toner is used having magnetic toner particles containing a binder resin and a magnetic iron oxide particle, and has a specific saturation magnetization, specific weight-average particle diameter and specific composition. The developer bearing member includes a surface layer containing a binder resin, a quaternary ammonium salt, graphitized particles, and conductive, spherical resin particles, and has a specific surface shape.

Developing apparatus and electrophotographic image-forming apparatus

In a developer carrying member used in a developing apparatus by means of which an electrostatic latent image formed on an electrostatic latent image bearing member is developed with a developer to render it visible, the developer carrying member has at least a substrate and a resin coat layer formed on the substrate surface, and the resin coat layer contains at least a binder resin and graphitized particles. The surface of the resin coat layer has an average value A and a standard deviation &#x3c3; of 100&#x2266;A&#x2266;800 (N/mm) and &#x3c3;&#x3c;30 (N/mm), respectively.

The present invention relates to a developer carrying member for carrying a developer having at least a substrate and a resin-coated layer formed on the surface of the substrate. The developer carrying member is the one which carries a one-component developer to visualize the electrostatic latent image carried by the electrostatic latent image carrying member, the resin-coated layer contains at least a binder resin, graphitized particles and roughing particles, the graphitized particles has 0.20 to 0.95 of graphitization degree (p(002)), and wherein in the surface configuration of the resin-coated layer as measured by use of focusing optical laser, the volume (B) of a microtopographical region defined by a certain area (A) of the microtopographical region without convexity formed by the roughing particles meets the following relationship 4.5&#x2266;B/A&#x2266;6.5, and the resin-coated layer has 0.9 to 2.5 &#x3bc;m of arithmetic mean roughness (Ra).

Developer carrying member and developing method by using thereof

The present invention relates to a developer carrying member for carrying a developer having at least a substrate and a resin-coated layer formed on the surface of the substrate. The developer carrying member is the one which carries a one-component developer to visualize the electrostatic latent image carried by the electrostatic latent image carrying member, the resin-coated layer contains at least a binder resin, graphitized particles and roughing particles, the graphitized particles has 0.20 to 0.95 of graphitization degree (p (002)), and wherein in the surface configuration of the resin-coated layer as measured by use of focusing optical laser, the volume (B) of a microtopographical region defined by a certain area (A) of the microtopographical region without convexity formed by the roughing particles meets the following relationship 4.5&#x2266;B/A&#x2266;6.5, and the resin-coated layer has 0.9 to 2.5 &#x3bc;m of arithmetic mean roughness (Ra).

A developer carrier is capable of stably charging a toner over a long term without change in physical surface shape and composition. The developer carrier has at least a substrate and resin coating layer formed on a surface of the substrate. The resin coating layer includes at least graphitized particles (i) with a degree of graphitization p() of 0.20 to 0.95 and an indentation hardness HUT [] of 15 to 60 or graphitized particles (ii) with a degree of graphitization p() of 0.20 to 0.95 and an average circularity SF-of 0.64 or more.

Growing community of inventors

Numazu, Japan

Satoshi Otake