Fuji Electric Co., Ltd.

Hiroshi Emori

Seizo Kitagawa

Shinjiro Suzuki

Kazuki Nebashi

Yasushi Tanaka

Yoichi Nakamura

Masaru Takeuchi

Ikuo Takaki

Kazuya Saito

Hiroyuki Ichiyanagi

A photoconductor for electrophotography includes a base member; an anodic oxide coating provided on the base member and having a film thickness of 2 to 10 &#x3bc;m; an interlayer provided on the anodic oxide coating and containing a vinyl chloride-vinyl acetate copolymer resin and having a film thickness of 0.02 to 0.3 &#x3bc;m; and a photosensitive layer including a charge transport layer formed on the interlayer and containing a charge transport material and a first resin binder, and a charge generation layer laminated on the charge transport layer and containing a charge generation material, a hole transport material, a first electron transport material that is a naphthalenetetracarboxylic diimide compound, a second electron transport material that is an azoquinone compound, a diphenoquinone compound, or a stilbenequinone compound and that has a mobility of 17&#xd7;10cm/V&#xb7;s or more, and a second resin binder.

Photoconductor having interlayer for hole injection promotion

A layered, positively-charged electrophotographic photoreceptor, a method for manufacturing the photoreceptor and an electrophotographic apparatus using the photoreceptor are disclosed. The layered, positively-charged electrophotographic photoreceptor includes a conductive support on which is provided a sequential stack composed of a charge transport layer containing at least a first hole transport material and a first binder resin; and a charge generation layer containing at least a charge generation material, a second hole transport material, an electron transport material, and a second binder resin, wherein the charge generation layer and the charge transport layer have a total amount of residual solvents that is 50 &#x3bc;g/cmor less. The photoreceptor is highly sensitive, highly durable, and has excellent image qualities including low image defects from cracks generated due to image memory or contact contamination. The photoreceptor is applicable to a high-resolution and high-speed positively-charged electrophotographic apparatuses and provides excellent operational stability.

Electrophotographic photoreceptor, method for manufacturing same, and electrophotographic apparatus using same

An electrophotographic photoconductor includes a conductive support; and a photoconductive layer that contains at least a charge generation material, a hole transport material, an electron transport material and a binder resin, and that is provided on the conductive support, wherein the photoconductive layer has an outermost layer that contains a charge generation material, a hole transport material, an electron transport material, a binder resin and a highly branched polymer that is obtained by polymerizing, in the presence of a polymerization initiator, a monomer having, in a molecule, two or more radically polymerizable double bonds and a monomer having, in a molecule, a long-chain alkyl group or an alicyclic group and at least one radically polymerizable double bond. The electrophotographic photoconductor exhibits superior operational stability and stably high image quality, without problems with image memory, a contact member, or image defects due to cracks caused by contamination by oils/fats or sebum.

Electrophotographic photoconductor, production method thereof, and electrophotographic apparatus

An electrophotographic photoconductor includes a conductive support; a charge generation layer provided on the conductive support; and a charge transport layer containing a charge transport material, a binder resin, and a highly branched polymer having a long-chain alkyl group or an alicyclic group, provided on the charge generation layer as an outermost layer. The electrophotographic photoconductor has excellent contamination resistance against sebum or the like, stable electrical characteristics even upon repeated use, as well as superior transfer resistance and gas resistance. A method for producing the electrophotographic photoconductor is disclosed, as well as an electrophotographic apparatus including the electrophotographic photoconductor.

In an electrophotographic photoreceptor having a photosensitive layer on an electroconductive substrate, the photosensitive layer is a positive-charging laminate comprising at least a charge transport layer and a charge generating layer laminated in that order, with the charge generating layer containing at least a resin binder, a charge generating agent, a space filler and an electron transport agent, while the charge transport layer contains at least, as a resin binder, polystyrene and a hole transport agent, and mineral oil of the charge transport layer is in an amount of 1% by mass or less of an amount of polystyrene. Thus, a highly durable and economic positive-charging multilayer electrophotographic photoreceptor and a manufacturing method therefor may be achieved.

Growing community of inventors

Matsumoto, Japan

Hiroshi Emori