Shindengen Electric Manufacturing Company Limited

Yamanashi Electronics Co., Ltd.

Takasago International Corporation

Kenichi Fujimori

Yoshitaro Nakayama

Hajime Suzuki

Toshimitsu Hagiwara

Tohru Kobayashi

Tetsuya Sakuma

Kazuhito Dohi

Masahiro Horigome

Tadaichi Murata

Fuminori Tsuruta

Tsuneo Isomura

Yoshitarou Nakayama

Yoshiko Shima

Atsushi Iwanami

Takumi Shinohara

Mitsuru Noro

Sachio Oomori

An electrophotographic photoreceptor in which the surface of a photosensitive layer has a small friction coefficient without impairing the excellent electrophotographic characteristics and which has an enhanced oil resistance and does not cause light fatigue, the electrophotographic photoreceptor comprising an electroconductive support having formed thereon a photosensitive layer comprising at least a charge-generating agent, a charge-transfer agent and a binder resin, wherein the photosensitive layer contains a polycarbonate copolymer comprising a recurring unit represented by the general formula (I) as the binder resin: ##STR1## and a butadiene compound represented by the general formula (IV) as the charge-transfer agent: ##STR2##

Electrophotographic photoreceptor with polycarbonate copolymer and

An electrophotographic photoreceptor which is highly sensitive to light having a wavelength in the oscillatory wavelength region of semiconductor laser and responds quickly and is excellent in other electrophotographic characteristics and which consists an electroconductive support, a charge-generating layer and a charge-transfer layer, the two layers being placed on the support, and said charge-transfer layer containing a specific butadiene compound having formula (I); ##STR1## and a monophenol type antioxidant, the weight ratio of the monophenol type antioxidant/the butadiene compound ranging from 5/95 to 40/80.

Electrophotographic photoreceptor

An electrophotographic photoreceptor comprising a support having thereon a photosensitive layer, in which said photosensitive layer contains a butadiene compound represented by the following general formula: ##STR1## wherein each of A.sub.1 -A.sub.4, which may be the same or different, is an alkyl group, a hydrazone compound represented by the following general formula [II]: ##STR2## wherein each of B.sub.1 and B.sub.2, which may be the same or different, is an alkyl group, a phenyl group, a benzyl group or a methoxyphenyl group, R.sub.1 is hydrogen, an alkyl group or O-R in which R is a straight-chain or branched alkyl, alkenyl or alkadienyl group having from 5 to 10 carbon atoms or an aralkyl group having from 7 to 10 carbon atoms, and R.sub.2 is an alkyl group, a phenyl group, a methoxy group, an ethoxy group, a benzyl group, a methoxyphenyl group, a tolyl group or a naphtyl group, and a monophenol compound. the photoreceptor is not destroyed or does not crack even when oil drops or fingerprints adhere to the photoreceptor.

An electrophotographic photoreceptor having a photosensitive layer containing a butadiene compound represented by general formula ##STR1## wherein A.sub.1 to A.sub.4 are alkyl group, and a hydrazone compound represented by general formula ##STR2## wherein B.sub.1 and B.sub.2 are alkyl, phenyl, benzyl or methoxyphenyl groups, R.sub.1 is hydrogen, alkyl, alkoxy or benzyloxy groups and R.sub.2 is alkyl, phenyl or benzyl groups. The photoreceptor can suppress the photo-deterioration due to cyclic operation and is useful in the field of copying printers.

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Nakakoma, Japan

Kenichi Fujimori