Hitachi Chemical Company, Ltd.

Hitachi, Ltd.

Yasuo Katsuya

Akira Kageyama

Keiichi Endo

Yoshii Morishita

Yasushi Shinbo

Sukekazu Aratani

Noriyuki Kinjo

Shigeru Hayashida

Tsuneaki Kawanishi

Toshiro Saito

Masato Fukasawa

Katuo Sugawara

Takayuki Akimoto

Yasuki Mori

Shigeo Suzuki

Akira Hosoya

Susumu Kaneko

Seiji Miyaoka

Kouji Ohkoshi

Chihiro Kato

Makoto Sekine

An electrophotographic member which can give printed images of high quality and is markedly high in photoresponsiveness can be provided without using halogen solvents by using a composition for charge transport layer which contains a polycarbonate resin having a recurring structural unit represented by the following formula (I) and, if necessary, a specific styryl compound, a specific hydrazone compound and the like: ##STR1## wherein R.sub.1 and R.sub.2 =alkyl, etc.

Composition for charge transport layer and electrophotographic member

A novel enamine derivative is effective as a charge transport material and can provide an electrophotographic plate excellent in sensitivity, photoresponse and durability.

Enamine derivatives

A photosensitive element for electrophotography has an electrically conductive substrate and a layer structure thereon comprising a charge generating substance and a charge transport substance. An improved charge transport substance is a derivative of triphenylamine in which at least 80% of the electrons in the highest occupied molecular orbital are located on the triphenylamine skeleton. Examples of such compounds have the following formula: ##STR1## wherein X is a an optionally substituted heterocyclic radical containing at least one ring nitrogen, Q is a single bond or --C.dbd.C--, and Z.sub.1, Z.sub.2 and Z.sub.3 are H, lower alkyl or alkoxy, aryl, NO.sub.2, CF.sub.3, --N(R').sub.2, --S--C.sub.6 H.sub.5 or --S(R').sub.2.

Photosensitive element for electrophotography

In an electrophotographic plate, that having an undercoating layer with smooth surface when observed by using a scanning electron microscope and an electric conductivity of at least 2.times.10.sup.-14 .OMEGA..sup.-1 .multidot.cm.sup.-1 between an electroconductive substrate and a photosensitive layer is improved in electrophotographic properties which are hardly changed by changes of circumstances.

Electrophotographic plate including an undercoating layer having a

An electrophotographic plate having a protective layer comprising a fluorine-containing copolymer having monomer units of a fluoroolefin, and an alkyl vinyl ether and/or cycloalkyl vinyl ether on an organic photoconductive layer formed on the electroconductive layer is excellent in electrophotographic properties and durability.

Electrophotographic plate having a protective layer of a

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Hitachi, Japan

Yasuo Katsuya