Electrophotographic bisazo photoconductor

Claim 2

An electrophotographic photoconductor wherein said photoconductive layer comprises a charge carrier producing layer comprising said bisazo pigment, formed on said electroconductive support material, and a charge transporting layer formed on said charge carrier producing layer, containing a charge transporting material, the thickness of said charge carrier producing layer being not more than 5 μm and that of said charge transporting layer being in the range of about 3 μm to 50 μm.

Claim 3

An electrophotographic photoconductor as claimed in claim 1, wherein said charge carrier producing layer comprises said bisazo pigment deposited on said electroconductive support material under reduced pressure.

Claim 4

An electrophotographic photoconductor comprising an electroconductive support material having thereon a photoconductive layer containing a bisazo pigment having the general formula ##STR86## wherein substituent A of the formula is ##STR87## wherein X is selected from the group consisting of a hydrocarbon aromatic ring, a heterocyclic ring, substituted hydrocarbon aromatic rings and substituted heterocyclic rings; Ar 1 is selected from the group consisting of a hydrocarbon aromatic ring, a heterocyclic ring, substituted hydrocarbon aromatic and substituted heterocyclic rings; Ar 2 and Ar 3 are each selected from the group consisting of a hydrocarbon aromatic ring and substituted hydrocarbon aromatic rings; R 1 and R 3 are selected from the group consisting of hydrogen, lower alkyl, phenyl, substituted lower alkyl and substituted phenyl; and R 2 is selected from the group consisting of lower alkyl, carboxyl and ester derivatives of said carboxyl group.

Claim 5

An electrophotographic photoconductor comprising an electroconductive support material having thereon a photoconductive layer containing a bisazo pigment having the general formula ##STR86## wherein substituent A of the formula is ##STR87## wherein X is selected from the group consisting of a hydrocarbon aromatic ring, a heterocyclic ring, substituted hydrocarbon aromatic rings and substituted heterocyclic rings; Ar 1 is selected from the group consisting of a hydrocarbon aromatic ring, a heterocyclic ring, substituted hydrocarbon aromatic and substituted heterocyclic rings; Ar 2 and Ar 3 are each selected from the group consisting of a hydrocarbon aromatic ring and substituted hydrocarbon aromatic rings; R 1 and R 3 are selected from the group consisting of hydrogen, lower alkyl, phenyl, substituted lower alkyl and substituted phenyl; and R 2 is selected from the group consisting of lower alkyl, carboxyl and ester derivatives of said carboxyl group.

Claim 6

An electrophotographic photoconductor as claimed in claim 1, wherein X is selected from the group consisting of a benzene ring, substituted benzene rings, a napthalene ring, substituted naphthalene rings, a carbazole ring, substituted carbazole rings, an indole ring, substituted indole rings, a benzofuran ring and substituted benzofuran rings; Ar 1 is selected from the group consisting of a benzene ring, substituted benzene rings, a napthalene ring, substituted napthalene rings, a dibenzofuran ring, substituted dibenzofuran rings, a carbazole ring and substituted carbazole rings; and Ar 2 and Ar 3 are each selected from the group consisting of a benzene ring and substituted benzene rings.

Claim 7

An electrophotographic photoconductor as claimed in claim 1, wherein said photoconductive layer contains dispersed in a binder said bisazo pigment in the form of particles of less than 5 microns in diameter in the range of 30 to 70 percent of the total weight of said photoconductive layer, the thickness of said photoconductive layer being in the range of 3 μm to 50 μm.

Claim 8

An electrophotographic photoconductor as claimed in claim 1, wherein said photoconductive layer contains (i) dispersed in a binder said bisazo pigment in the form of particles of less than 5 μm in the range of not more than 50 percent of the total weight of said photoconductive layer and (ii) a charge carrier transporting material.

Claim 9

An electrophotographic photoconductor as claimed in claim 6, wherein said charge carrier producing layer contains dispersed in a binder resin said bisazo pigment in the form of particles of less than 5 μm in diameter.