Konica Minolta, Inc.

Mari Konishi

Toshiyuki Fujita

Daisuke Kodama

Keiichi Inagaki

Masanori Yumita

Toyoko Shibata

Takeshi Nakamura

An electrophotographic photoreceptor includes: a conductive holder; and at least a charge producing layer and a charge transport layer disposed on the conductive holder in order. The charge transport layer contains at least a binder resin, a charge transport agent and a p-type metal oxide particle.

Electrophotographic photoreceptor, electrophotographic image forming method and electrophotographic image forming apparatus

The electrophotographic photoreceptor of the present invention at least includes a charge-generating layer, a charge-transporting layer, and a surface protective layer sequentially deposited on an electroconductive support, wherein the charge-transporting layer contains a charge-transporting material having an ionization potential (IP); the surface protective layer contains a binder resin and a metal oxide microparticle having an ionization potential (IP); and the ionization potential (IP) and the ionization potential (IP) satisfy the relationship represented by Expression (A): &#x2212;0.4 eV&#x2266;(IP&#x2212;IP)&#x2266;0.4 eV.

Electrophotographic photoreceptor

The electrophotographic photoreceptor of the present invention includes a conductive support, a photosensitive layer disposed on the conductive support, and a surface protective layer disposed on the photosensitive layer. The surface protective layer contains a binder resin and a fine particulate material containing at least one compound selected from MgCuO, CaCuO, SrCuO, and BaCuO.

Electrophotographic photoreceptor, and method and apparatus of forming electrophotographic image

In an organic photoreceptor that has a protective layer formed on an organic photosensitive layer, the protective layer contains; a cured resin constituent obtained by polymerizing a polymerizable compound in the presence of a radical scavenger represented by the general formula (2); metal oxide microparticles; and a compound represented by the general formula (1) as a charge transport substance, and the relational expression (1): 80/A&#x2266;B&#x2266;160/A and the relational expression (2): 12&#x2266;A&#x2266;25 are satisfied when the volume ratio (volume %) of the metal oxide microparticles in the protective layer and the volume ratio (volume %) of the compound represented by the general formula (1) in the protective layer are respectively denoted by A and B.

Organic photoreceptor, image forming apparatus, and image forming method

The invention provides a means for improving the abrasion resistance and the scratch resistance of a protection layer by increasing the surface hardness of the protection layer of an organic photoreceptor. The invention is an organic photoreceptor constituted by laminating on an electroconductive substrate, a photosensitive layer and a protection layer successively, wherein the protection layer comprises a charge transport substance represented by the following general formula (1), a resin component obtained by curing a curable compound and tin oxide treated with a surface preparation agent having a reactive organic group, and a silica particle: 

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Mitaka, Japan

Mari Konishi