Fuji Xerox Co., Ltd.

Xerox Corporation

Mitsuhide Nakamura

Hirofumi Nakamura

Katsumi Nukada

Masahiro Iwasaki

Koji Bando

Wataru Yamada

Takayuki Yamashita

Jiro Korenaga

Keiko Matsuki

Nan-Xing Hu

Takahiro Suzuki

Kenny-Tuan Dinh

Kenji Ikeda

Giuseppa Baranyi

Taketoshi Hoshizaki

Kazuya Hongo

Kazuhiro Koseki

Daisuke Haruyama

Yukimi Kawabata

Michael E Zak

Kazuyuki Tada

Kenta Ide

Yuko Yamano

Takanori Suga

Hirokazu Sakashita

Shingo Hirahara

Kaori Iemula

Yasuhiro Nida

MasahiKo Hozumi

Shiro Kimura

Provided is an electrophotographic photoreceptor including a conductive substrate and a photosensitive layer provided on the conductive substrate, wherein an uppermost surface layer thereof is constituted with a cured film of a composition that contains at least two kinds of reactive charge transporting materials selected from a first reactive charge transporting material having an &#x2014;OH group as a reactive functional group and a second reactive charge transporting material having an &#x2014;OCHgroup as a reactive functional group, fluororesin particles, and an alkyl fluoride group-containing copolymer having repeating units represented by the following Structural Formulae A and B, and a relative dielectric constant &#x2208;r of the uppermost surface layer satisfies the following Formula (1): 

Electrophotographic photoreceptor, process cartridge, and image forming apparatus

Provided is an electrophotographic photoreceptor including an electroconductive substrate, an undercoat layer that is provided on the electroconductive substrate, contains a binder resin, metal oxide particles and an electron accepting compound having an acidic group and has an AC impedance of from 1&#xd7;10&#x3a9; to 1&#xd7;10&#x3a9; under the measurement condition in which a temperature is 22&#xb0; C., a humidity is 50% RH, an AC voltage is &#xb1;1 V, and a frequency is 1 Hz and an AC impedance of from 1&#xd7;10&#x3a9; to 1&#xd7;10&#x3a9; under the measurement condition in which a temperature is 22&#xb0; C., a humidity is 50% RH, an AC voltage is &#xb1;1 V, and a frequency is 100 Hz, and a photosensitive layer that is provided on the undercoat layer.

There is provided an electrophotographic photoreceptor including a conductive substrate; an intermediate layer; a photosensitive layer; and a surface layer, in this order, the surface layer including two or more charge transporting materials each including a reactive substituent and respectively having mutually different ionization potentials, in an amount of 90% by weight or more relative to the total solid content of the surface layer, and the content ratio X of each of the two or more charge transporting materials satisfying the following Formula (1). X(n) represents a content ratio (weight %) of a charge transporting material that has the nhighest ionization potential among the two or more charge transporting materials; X(n&#x2212;1) represents a content ratio (weight %) of a charge transporting material that has the (n&#x2212;1)highest ionization potential among the two or more charge transporting materials; and n is an integer of two or more and represents a variable equal to or lower than the number of charge transporting materials contained in the surface layer.(&#x2212;1)&#x2267;()&#x2003;&#x2003;Formula (1).

Electrophotographic photoreceptor, image forming apparatus and process cartridge

An electrophotographic photoreceptor is provided, which includes: a substrate; a photosensitive layer; and a surface protective layer, in this order, in which the protective layer contains a crosslinked product of a curable charge transporting material in a content of from about 90 to 98% by weight, and fluorinated resin particles in a content of from about 2 to 10% by weight, and the protective layer satisfies Formula (1): 0.5&#x2266;b/a&#x2266;1, wherein, 'a' represents a ratio of fluorine atoms to the sum of carbon atoms, oxygen atoms, and fluorine atoms present in a region of the protective layer ranging from the photosensitive layer side surface thereof to a point corresponding to about &#x2154; of the thickness thereof, and 'b' represents the ratio in a region of the protective layer ranging from the outer surface thereof to a point corresponding to about &#x2153; of the thickness thereof.

Electrophotographic photoreceptor, method for producing electrophotographic photoreceptor, image forming apparatus, and process cartridge

An electrophotographic photoreceptor including a conductive substrate and a photosensitive layer provided on a surface of the conductive substrate, an outermost layer of the photosensitive layer containing a crosslinked product formed from at least one charge transporting material having at least one substituent selected from the group consisting of &#x2014;OH, &#x2014;OCH, &#x2014;NH, &#x2014;SH, and &#x2014;COOH and at least one selected from a guanamine compound or a melamine compound, the content of the at least one charge transporting material being at least about 90% by weight, and the content of the at least one selected from the guanamine compound or the melamine compound being from about 0.1% by weight to about 5% by weight.

Electrophotographic photoreceptor, process cartridge and image forming apparatus

According to an aspect of the invention, an electrophotographic photoreceptor including a conductive substrate and a photosensitive layer provided on a surface of the conductive substrate is provided. In the electrophotographic photoreceptor, an outermost layer of the photosensitive layer containing a crosslinked product formed from at least one charge transporting material having at least one substituent selected from the group consisting of &#x2014;OH, &#x2014;OCH, &#x2014;NH, &#x2014;SH, and &#x2014;COOH, an acidic substance, and at least one compound selected from the group consisting of compounds represented by the following formula (A) and compounds represented by the following formula (B). 

The invention provides an image forming apparatus comprising at least: an electrophotographic photoreceptor comprising at least a conductive substrate and a photosensitive layer provided on the conductive substrate; a charging device; an exposure device; a developing device; and a transfer device, wherein the exposure device is of a multi beam exposure system which has a surface emitting laser array having two or more light-emitting elements as an exposure light source and which scan the electrophotographic photoreceptor with plural light beams thereby forming electrostatic latent image, and wherein the outermost layer in the electrophotographic photoreceptor, positioned most distant from the conductive substrate, contains a silicon-containing resin containing at least a charge transporting compound or a characteristic group derived from a charge transporting compound, and having a structure in which bonds formed by crosslinking of an O atom with neighboring Si atoms are formed three dimensionally.

Image forming apparatus

In the formation of a multicolor image for generating a color print by repeating operation for transferring on an intermediate transfer member every color after one color toner image is formed on a photoreceptor drum, when an image of each color is written on the photoconductor, the image writing start position of each color is differentiated in a process direction of the photoconductor on the basis of a position reference mark on the intermediate transfer member detected by a sensor. This prevents a defect on the photoconductor from being enlarged and visually conspicuous.

Multicolor image formation apparatus and multicolor image formation

A method for removing an amorphous selenium-containing photosensitive layer from an electrophotographic photoreceptor including an electroconductive metallic substrate having thereon the amorphous selenium-containing photo-sensitive layer using a method in which the combination of substrate and selenium-containing photosensitive layer is treated with an aqueous solution of sodium sulfide or sodium thiourea.

Method for removing a selenium-containing layer from a

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Kanagawa, Japan

Mitsuhide Nakamura