Layered electrophotographic photoconductor

Claim 1

In a layered electrophotographic photoconductor comprising an electroconductive support material and a photoconductive double layer which consists of a charge generation layer and a charge transport layer, the improvement comprising: a. said charge generation layer comprises a disazo pigment selected from the group consisting of disazo pigments of the formula ##STR21## where A represents ##STR22## and X represents an aromatic ring, or a heterocyclic ring, or their substituted rings; Ar 1 represents an aromatic ring, or a heterocyclic ring, or their substituted rings; Ar 2 and Ar 3 each represent an aromatic ring, R 1 and R 1 each represent hydrogen, a lower alkyl group, a phenyl group or their substituted groups; and R 2 represents a lower alkyl group, a carboxyl group or its ester group, and b. said charge transport layer comprises a charge transport material capable of forming a charge-transfer complex by reaction with 2,4,7-trinitro-9-fluorenone, the light energy value corresponding to the wavelength of the maximum visible spectral absorption of said charge-transfer complex being in the range of 1.6 to 2.1 eV, and being selected from the group consisting of: 9-methyl-3-formylcarbazole-1'-methyl-1' phenylhydrazone, 9-(4-diethylaminostyryl-1)-anthracene, 9-(4-dibenzylaminobenzylidene-1)-fluorene, 9-{4-di-(4-methylbenzyl)aminobenzylidene}-fluorene, 4-methoxy-1-formylnaphthalene-1'-methyl-1'-phenylhydrazone, and 4-dibenzylaminobenzaldehyde-1'-methyl-1'-phenylhydrazone.