Ricoh Company, Ltd.

Kaoru Teramura

Masayuki Shoshi

Megumi Kawahara

Masayuki Koyano

Akio Kojima

Masao Yoshikawa

Yumi Ichikawa

Masaomi Sasaki

Tetsuro Suzuki

Masafumi Ohta

Takeo Yamaguchi

Isamu Shibata

Masakatsu Shimoda

A pyrazine compound of formula (I) and a pyrazine compound of formula (II): ##STR1## wherein R is an unsubstituted or substituted phenyl group, an unsubstituted or substituted naphthyl group; and an electrophotographic photoconductor which includes an electroconductive support and a photoconductive layer formed thereon containing a charge generating material and a charge transporting material which is any of the above-mentioned pyrazine compounds of formula (I) and formula (II).

Tricyclic pyrazine compound and electrophotographic photoconductor

A positively-chargeable single-layered type organic electrophotographic photoconductor composed of an electroconductive support and an organic single-layered photoconductive layer containing a charge generating material, an organic positive hole transporting material and an organic acceptor compound which are dispersed in a matrix binder agent, with the relationship of the oxidation potential (E.sub.ox) of the charge generating material.ltoreq.the oxidation potential (E.sub.ox) of the organic positive hole transporting material being satisfied.

Positively-chargeable single-layered type electrophotographic

Pyrazine compound and electrophotographic photoconductor comprising the

A high dielectric polymeric optical recording medium for recording information by heating the portions of the recording medium corresponding to the information to be recorded by being exposed to a beam of light, followed by the application of a reverse electric field to the recording medium, thereby selectively reversing the polarity of the heated portions in the recording medium, is disclosed, which comprises a high dielectric polymeric recording layer containing a high dielectric polymeric composition comprising a high dielectric polymeric material and a nonionic dye serving as a light-absorption agent which is compatible with or dispersible in the high dielectric polymeric material.

High dielectric polymeric optical recording medium

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Kawasaki, Japan

Kaoru Teramura