Electrophotographic photoreceptor

Claim 1

An electrophotographic photoreceptor which has an electrophotographic photoreceptive layer containing a charge generating material and a charge transporting material, said charge generating material being a compound of the following general formula (I) or (II): ##STR11## wherein: (i) m is 0, and n is 0, 1, or 2, (ii) R 1 to R 5 may be the same or different, and each is a hydrogen atom, an alkyl group, an aralkyl group, an aryl group or a monovalent group produced by removing one hydrogen atom from a heterocyclic ring, (iii) A 1 is substituted phenyl group, a monovalent group produced by removing one hydrogen atom from a monocyclic 5-membered hetero-ring, a condensed 5-membered hetero-ring or a condensed 6-membered hetero-ring, which have the following structural formulae, respectively; ##STR12## wherein R 6 is an alkoxy group, an aralkyloxy group or a substituted amino group of the formula ##STR13## R 12 and R 13 each is a substituted or non-substituted alkyl group or a substituted or non-substituted phenyl group, or they may combine with each other and form a nitrogen-containing hetero-ring, and they may be the same or different; R 7 and R 8 may be the same or different, and each is a hydrogen atom, a halogen atom, an alkyl group or a lower alkoxy group; Y and Z are S, O or N--R 14 , wherein R 14 is an alkyl group having 1 to 4 carbon atoms, and they may be the same or different; R 9 and R 10 may be the same or different, and each is a hydrogen atom, an alkyl group or an alkoxy group, or they may combine with each other and form a benzene ring or a naphthalene ring; and R 11 is a hydrogen atom, an alkyl group, an alkoxy group, an aryloxy group, an acyl group, an alkoxycarcarbonyl group, an aryloxycarbonyl group, a halogen atom, a monoalkylamino group, a dialkylamino group, an amido group or a nitro group, which groups each may be substituted; (iv) A 2 is a divalent group produced by removing two hydrogen atoms attached to the same carbon from a heterocyclic ring selected from a group consisting of imidazoles, 3H-indoles, thiazoles, benzothiazoles, naphthothiazoles, thianaphtheno-7',6',4,5-thiazoles, oxazoles, benzoxazoles, naphthooxazoles, selenazoles, benzoselenazoles, naphthoselenazoles, thiazolines, quinolines, isoquinolines, benzimidazoles and pyridines, and (v) B 1 is a divalent group selected from substituents of the following structural formulae; ##STR14## wherein R 15 and R 16 each is an alkyl group or an aryl group; X is an oxygen atom or a sulfur atom; and B 2 is a cyano group, a carboxyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, an alkylsulfonyl group, an alkylcarbonyl group, an arylcarbonyl group, a nitro group, a nitro-substituted aryl group, a sulfo group, a trifluoromethylsulfonyl group, a carbamoyl group, an alkylcarbamoyl group, an arylcarbamoyl group or an acyl group whose carbonyl group is attached to a monovalent group produced by removing one hydrogen atom from a heterocyclic ring, and said charge transporting material is at least one compound selected from the group consisting of triphenylamine derivatives, polyarylalkane derivatives, pyrazoline derivatives and hydrazone derivatives.