Canon Kabushiki Kaisha

Hideki Anayama

Hidetoshi Hirano

Toshiyuki Yoshihara

Hideyuki Ainoya

Takashi Koyama

Itaru Yamazaki

Akira Yoshida

Yuichi Hashimoto

Mayumi Kimura

Kiyoshi Sakai

Hajime Miyazaki

Naoto Fujimura

Junichi Kishi

Nobuyuki Hanami

Masato Tanaka

Atsushi Fujii

Akio Maruyama

Katsumi Aoki

Shoji Amamiya

Kazushige Nakamura

Takakazu Tanaka

Shinya Mayama

Hirotoshi Uesugi

Hiroyuki Tanaka

Tetsuro Fukui

Michiyo Sekiya

Hiroshi Sasame

Teigo Sakakibara

Ryuji Higashi

Wataru Kitamura

Yoichiro Maebashi

Hiroki Uematsu

Hideyuki Takai

Tetsuro Kanemaru

Kan Tanabe

Masaaki Hiro

Yoichi Kawamorita

Kazushi Iuchi

Yuichi Yashiki

Hiroyuki Ohmori

Harumi Sakoh

Kazue Asakura

Noriko Hirayama

Tatsuo Maeda

The present invention provides an electrophotographic photosensitive member capable of maintaining high transfer efficiency without causing large transfer current for a long-term use, obtaining an excellent image, and achieving those effects especially when being applied to a color electrophotographic apparatus. The invention also provides a process cartridge and an electrophotographic apparatus each having such a photosensitive member. The present invention includes an electrophotographic photosensitive member having a photosensitive layer on a support, a surface layer containing diorganopolysiloxane having specific repeating structure units &#x3b1; and &#x3b2;, and having a weight-average molecular weight of 1,000 to 1,000,000; in which a content of the diorganopolysiloxane in the surface layer is 0.01 to 20% by weight based on the entire weight of the surface layer (except in the case where the surface layer contains fluorine atom-containing resin particles).

Electrophotgraphic photosensitive member, process cartridge, and electrophotgraphic apparatus

An electrophotographic photosensitive member has a support and a photosensitive layer provided thereon. The photosensitive layer contains a carixarene compound having specific structure. Also disclosed are a process cartridge and an electrophotographic apparatus which have the electrophotographic photosensitive member.

Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus

Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus

The present invention provides an electrophotographic photosensitive member having a surface layer containing diorganopolysiloxane having, as substituents, a perfluoro group, and a group having a substituted or unsubstituted polystyrene chain, a closed terminal and a degree of polymerization of 3 or more. The present invention also provides a process cartridge having the electrophotographic photosensitive member, and an electrophotographic apparatus.

An electrophotographic photosensitive member comprises a conductive support and a photosensitive layer which comprises a charge generation layer and a charge transport layer, characterized in that the charge generation layer contains a polycarbonate resin, and the electrophotographic photosensitive member is electrostatically charged by applying a direct current voltage to a charging member in contact with the surface of said electrophotographic photosensitive member.

Electrophotographic apparatus with DC contact charging and photosensitive layer with polycarbonate resin in charge generation layer

An electrophotographic photosensitive member includes a support member and a photosensitive layer formed thereon. A surface layer of the electrophotographic photosensitive member contains diorganopolysiloxane represented by the following formula (1):

Electrophotographic photosensitive member process cartridge and electrophotographic apparatus

The present invention includes an electrophotographic photosensitive member having a surface layer containing a polyphenylene resin, and a process cartridge and an electrophotographic apparatus both having the electrophotographic photosensitive member.

Electrophotographic photosensitive member, and process cartridge and electrophotographic apparatus provided with the electrophotographic member

An electrophotographic photosensitive member is disclosed which is provided with a surface layer containing a polyarylate resin or polycarbonate resin. The polyarylate resin and polycarbonate resin have a structural unit having a cyclic siloxane structure in its backbone chain. Also a process cartridge and an electrophotographic apparatus using the photosensitive member are disclosed.

Electrophotographic photosensitive member, process cartridge, and

An electrophotographic photosensitive member is comprised of a support and a photosensitive layer formed on the support. The electrophotographic photosensitive member has a surface layer which contains a resin having at least one of the structural units represented by the following formula: ##STR1## wherein the bond represented by a broken line may be present, and when present, m is 4 and when m is 6, n represents an integer of 0 or more, and R.sub.1 and R.sub.2 represent each independently hydrogen, halogen, hydroxy, a substituted or unsubstituted alkyl, a substituted or unsubstituted unsaturated aliphatic hydrocarbon, a substituted or unsubstituted aryl, a substituted or unsubstituted cycloalkyl, a substituted or unsubstituted cyclodienyl, a substituted or unsubstituted alkoxy, a substituted or unsubstituted carbonyl, or a substituted or unsubstituted heterocyclic group.

An electrophotographic photosensitive member, comprising a support and a photosensitive layer disposed on the support. The photosensitive member has a surface layer comprising a siloxane polymer which comprises at least two polysiloxane units each independently represented by a formula (1) (shown in the specification) and has a molecular structure such that adjacent two polysiloxane units of the formula (1) are connected with each other at their side chains by --O--Pc--CO--O-- where Pc denotes a polycarbonate chain. Such a molecular structure of the siloxane polymer is effective in improving lubricating properties of the surface of the photosensitive member while retaining a mechanical strength thereof.

Electrophotographic photosensitive member, process cartridge and

An electrophotographic photosensitive member comprising a conductive support, a photosensitive layer and a protective layer containing a setting resin, characterized in that the photosensitive layer contains a resin which has a glass transition point of 170.degree. C. or more. The above image forming apparatus has excellent durability and good image forming properties.

Electrophotographic photosensitive member, electrophotographic apparatus

An electrophotographic photosensitive member has a support and a photosensitive layer provided on the support. The photosensitive layer containing a polysilane compound which has a structural unit represented by the following Formula (1) and has as a terminal group of the polymer chain a group selected from the group consisting of hydroxy, alkoxy and aryloxy ##STR1## wherein R.sub.1 represents a hydrogen atom, an alkyl group or an aralkyl group; R.sub.2 represents an ethyl group, a cycloalkyl group, a vinyl group, or an alkyl group or unsaturated hydrocarbon group having 3 or more carbon atoms, whose carbon atom directly bonded to the phenyl group is a primary carbon atom or a secondary carbon atom.

Electrophotographic photosensitive member, and process cartridge and

An electrophotographic photosensitive member is constituted by at least a support, a photosensitive layer disposed on the support, and a protective layer disposed on the photosensitive layer. The protective layer comprises a cured product obtained from a condensation product between a silyl acrylate compound and colloidal silica. The protective layer is effective in providing the photosensitive member with improved potential stability against a change in environmental conditions and an excellent durability.

Electrophotographic photosensitive member and electrophotographic

A surface layer of a photosensitive layer contains at least one resin selected from the group consisting of (a) a polyarylate resin having a structural unit represented by the following general formula (1) and (b) a polycarbonate resin having a structural unit represented by the following general formula (2): ##STR1## wherein, X.sub.1 and X.sub.2 are each single bond, --O--, --S-- or substituted or unsubstituted alkylene and are the same or different, R.sub.1 to R.sub.8 and R.sub.11 to R.sub.14 are each hydrogen, halogen, or substituted or unsubstituted alkyl or aryl and are the same or different, and R.sub.9 and R.sub.10 are each hydrogen, halogen, or substituted or unsubstituted silyl, alkyl or aryl and are the same or different, and n is an integer of 2 or more; ##STR2## wherein X.sub.3 and X.sub.4 are each single bond, --O--, --S-- or substituted or unsubstituted alkylene and are the same or different, R.sub.15 to R.sub.22 are each hydrogen, halogen, substituted or unsubstituted alkyl or aryl and are the same or different, R.sub.23 and R.sub.24 are each hydrogen, halogen, substituted or unsubstituted silyl, alkyl or aryl and are the same or different, and m is an integer of 2 or more.

Electrophotographic photosensitive member, and apparatus and process

An electrophotographic apparatus includes an electrophotographic photosensitive member, a charging member, an imagewise exposure system, a developing system having a toner feed member, a transfer system, and a cleaning system wherein the electrophotographic photosensitive member includes a surface layer containing a lubricative, fluorine-containing resin powder and the toner feed member includes a spacer member coming into contact with the surface layer of the electrophotographic photosensitive member; and also a process cartridge than can be detachably mounted on the electrophotographic apparatus.

Electrophotographic apparatus and process cartridge featuring an

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Yokohama, Japan

Hideki Anayama