Electrophotographic photoreceptor containing a trisazo compound

Abstract

There is disclosed an electrophotographic photoreceptor comprising an electroconductive support and, provided thereon, a photosensitive layer containing (A) a trisazo pigment formed by the reaction between a coupler component represented by the following general formula (I) and a diazonium salt represented by the following general formula (II) or (B) a bisazo pigment represented by the following general formula (III): ##STR1## wherein Z is a substituted or unsubstituted hydrocarbon ring or a group of atoms necessary to complete a substituted or unsubstituted hetero ring, R is oxygen, sulfur, or --NR'--, Y is a chain hydrocarbon necessary to complete a 5- or 6-membered ring, and R' is hydrogen or an alkyl, benzyl, or aryl group which may have a substituent; ##STR2## wherein A is a trivalent moiety whose carbon atom is bonded to nitrogen atom forming azo group and X.crclbar. is an anionic functional group; ##STR3## wherein A is a divalent moiety whose carbon atom is bonded to nitrogen atom forming azo group, R's which may be the same or different are each hydrogen, methyl, ethyl, nitro, or halogen, R' is hydrogen or halogen, X is --O--, --S--, or --NH--, and a is an integer of 1 or 2.

Dependencies are inferred from the claim text.