Electrophotographic photoreceptor containing a trisazo compound and a charge transport material

Claim 1

An electrophotographic photoreceptor comprising a conductive support having provided thereon a light-sensitive layer, wherein said light-sensitive layer contains as a charge generating material a trisazo compound represented by formula (I) ##STR64## wherein Cp represents a coupler residue; Z 1 represents ##STR65## --O--, --S--, or --Se--, wherein R 6 represents a hydrogen atom, a substituted or unsubstituted lower alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted alkoxycarbonyl group, a substituted or unsubstituted aryloxycarbonyl group, or a substituted or unsubstituted acyl group; and B 1 , B 2 , and B 3 each represents a hydrogen atom, a halogen atom, a substituted or unsubstituted lower alkyl group, a substituted or unsubstituted lower alkoxy group, a substituted or unsubstituted lower alkoxycarbonyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted aryloxy group, or a substituted or unsubstituted aryloxycarbonyl group; and contains as a charge transporting material at least one compound represented by one of formulae (II) to (VI) ##STR66## wherein R 7 , R 8 , R 14 , and R 15 each represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted aryl group; or R 7 and R 8 together form a heterocyclic ring, or R 14 and R 15 together form an N-containing heterocyclic ring; R 9 represents a hydrogen atom, a substituted or unsubstituted alkyl group, or a substituted or unsubstituted aryl group; B 1 and B 2 are the same as defined above; R 1 represents a substituted or unsubstituted alkyl group, or a substituted or unsubstituted phenyl group; R 10 and R 11 each represents a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aralkoxy group, or a substituted or unsubstituted amino group; R 16 , R 17 , R 18 , and R 19 each represents a hydrogen atom, a halogen atom, or an alkyl group; Ar represents a substituted or unsubstituted aryl group, or a substituted or unsubstituted heterocyclic group; Z 2 represents ##STR67## --O--, --S--, --Se--, or a substituted or unsubstituted methine group; Z 3 represents an atomic group forming a benzene ring or a naphthalene ring; n represents 0 or 1; and A represents a group of the formula ##STR68## wherein l and m represent 0 or an integer of from 1 to 6; n represents 0 or 1; and B 1 and B 2 are the same as defined above, or B 1 and B 2 together form a condensed polycyclic aromatic ring.