Mitsubishi Chemical Corporation

Mitsubishi Kasei Corporation

Mitsubishi Chemical Industries Limited

Sharp Kabushiki Kaisha Corporation

Mitsubhishi Kasei Corporation

Mamoru Nozomi

Shigenori Otsuka

Satoshi Kato

Akiteru Fujii

Yuuta Kumano

Teruyuki Mitsumori

Ryoko Aso

Tadashi Umehara

Kunio Ohashi

Hitoshi Ono

Mitsuru Tokuyama

Tetsuo Murayama

Hiroshi Kinashi

Michio Kawai

Tetsumi Suzuki

Hiromi Horiuchi

Sumiko Watabe

Itaru Ogawa

Osamu Murakami

Toshiya Asari

Tetsuo Ozawa

Masayuki Hiroi

Mitsuo Wada

Hiroaki Takamura

Kozo Ishio

Masahiro Nukui

Kazutaka Ida

Takahiro Choda

Chiyoko Sato

Hiroshi Urabe

Kiyoshi Sekihara

Makoto Furuune

Ryuji Nakayama

Akiko Miyake

Masahiro Fuse

Kohki Furuya

Shigenori Ohtsuka

Setsuko Sasakawa

Hiroe Kizaki

The present invention provides an electrophotographic photoreceptor which has high light resistance, has high durability in exposure to oxidizing gases such as ozone and NO, is excellent in mechanical properties such as printing durability, wearing resistance, marring resistance, and slip properties in repetitions of use, and further has excellent electrical properties. Specifically, the present invention provides an electrophotographic photoreceptor having an electroconductive substrate and provided thereon at least a photosensitive layer having a charge generation material, a charge transport material, and a binder resin.

Electrophotographic photoreceptor, drum cartridge employing the electrophotographic photoreceptor, and image-forming apparatus

Electrophotographic photoreceptors having improved mechanical properties, electrical properties with excellent response characteristics are prepared by forming a photosensitive layer on an electroconductive substrate. The photosensitive layer contains a binder resin, which may be a polyarylate or a copolymer of polyarylate. The binder resin may be mixed with other resins up to 50 wt % with other resins to impove surface slip properties or fire retardant properties.

Electrophotographic photoreceptor

A high-sensitivity and long-life electrophotographic photoreceptor comprising an electroconductive substrate and at least a photosensitive layer on the electroconductive substrate is provided, wherein the photosensitive layer contains a polyarylate resin not having a nitrogen atom in its repeating unit, and the Hall mobility at an electric field strength of 3&times;10 (V/cm) and at a temperature of 21&deg; C. of the photosensitive layer is 3&times;10 (cm /Vs) or more.

Electrophotographic receptor

An electrophotographic copying method, which comprises conducting each process of at least charging, exposing to light, developing and transferring, characterized in that the photoreceptor has at least an undercoat layer and a photosensitive layer on an electroconductive substrate, wherein the undercoat layer contains a semiconductive material having a band gap of at least 2.2 eV and a binder resin, the photosensitive layer contains at least a phthalocyanine compound as a charge-generation material, and image-formation is carried out from the first revolution of the photoreceptor.

Electrophotographic copying method and electrophotographic copying

An electrophotographic photoreceptor comprising an electrically conductive support and at least a carrier generation layer and a carrier transport layer formed on the substrate, wherein said carrier generation layer contains a polyester resin having a repeating structural unit of the following formula (I): ##STR1## wherein each of R.sup.1 and R.sup.2 is an alkylene group which may have a substituent; each of R.sup.3 and R.sup.4 is a hydrogen atom, an alkyl group which may have a substituent or an aryl group which may have a substituent, or R.sup.3 and R.sup.4 may together form a ring; Ar is an arylene group which may have a substituent; each of Ar.sup.1 and Ar.sup.2 is a phenylene group which may have a substituent; and each of m and n is from 0 to 10, provided that m and n are not simultaneously 0.

Electrophotographic photoreceptor having charge generating layer with

An electrophotographic photoreceptor comprising a cylindrical electrically conductive substrate having thereon at least a photoconductive layer, the conductive substrate having a marking portion in which the light reflectance of the surface of the conductor substrate has been changed by a laser light treatment, a method for producing the photoreceptor, and an image correcting method using the photoreceptor.

Electrophotographic photoreceptor and method for producing the

The disclosure describes an electrophotographic copying process for reversal development using a laminate-type electrophotographic photoreceptor having laminated on an electroconductive support a charge generation layer containing a phthalocyanine compound and a charge transport layer, and capable of forming plural copies of image, comprising at least charging step, image exposing step, developing step, transferring step and charge erasing step by light, wherein the charge erasure by light is not conducted in image formation by the first rotation of photoreceptor and is conducted in image formation by the second and succeeding rotations of photoreceptor.

Electrophotographic copying process for reversal development

Image correcting method using an electrophotographic photoreceptor

Disclosed herein is an electrophotographic photoconductor comprising:

Polycarbonate binder resin and electrophotographic photoconductor

An electrophotographic photoreceptor comprising an electrically conductive substrate and a photoconductive layer formed thereon, wherein said photoconductive layer contains a compound of the formula ( I ): ##STR1## wherein R.sup.1 to R.sup.18 are respectively and independently a hydrogen atom, a halogen atom, a saturated or unsaturated aliphatic hydrocarbon group, an aromatic hydrocarbon group, an alkoxy group, an aryloxy group, a dialkylamino group or a diarylamino group, wherein the aliphatic hydrocarbon group, the aromatic hydrocarbon group, the alkoxy group, the aryloxy group, the dialkylamino group and the diarylamino group may have substituents, X is a bivalent hydrocarbon group which may have substituents, each of A.sup.1 and A.sup.2 is a saturated or unsaturated aliphatic hydrocarbon group or an aromatic hydrocarbon group, or is bonded to R.sup.5 or R.sup.18 of the adjacent phenyl group to form a nitrogen-containing heterocyclic ring, wherein the aliphatic hydrocarbon group, the aromatic hydrocarbon group and the nitrogen-containing heterocyclic ring may have substituents.

A novel electrophotographic photoreceptor and a method of preparation therof are disclosed. The photoreceptor is characterized in that the photosensitive layer contain a specific carbonate resin binder resin having a weight average molecular weight on not less than 200,000. The resin is preferably a polycarbonate resin which contains repeating units represented by the formula ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7 and R.sup.8 are respectively and independently a hydrogen atom, a lower alkyl group, a halogen atom or an unsubstituted or substituted aromatic group; and R.sup.9 and R.sup.10 are respectively and independently a hydrogen atom, a lower alkyl group, an unsubstituted or substituted aromatic group, or form a ring or a carbonyl group together with the linking carbon atom. The method is characterized in that the photosensitive layer contains a polyocarbonate having a weight average molecular weight of not less than 200,000 as a binder resin and is formed by spray coating or spiral coating.

Electrophotographic photoreceptor containing polycarbonate resin as a

In the field of the photosensitive member for electrophotography comprising an electrically conductive substrate and at least one primer layer and a photosensitive layer, there is disclosed an improved member which is characterized in that the primer layer contains a copolyamide which contains as a constituent a diamine represented by a chemical formula ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 respectively and independently a hydrogen atom or a methyl or ethyl group.

Photosensitive member for electrophotography with copolyamide interlayer

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Yokohama, Japan

Mamoru Nozomi