Disazo compounds and photoconductive composition as well as electrophotographic light sensitive element containing the same

Claim 2

A photoconductive composition comprising a disazo compound represented by general formula (I), (II) or (III) ##STR17## wherein: A represents: ##STR18## wherein X represents an atomic group necesssary to complete an aromatic ring or a heterocyclic ring (said ring may be substituted or unsubstituted), by condensing with the benzene ring in the above formula to which a hydroxy group and Y are attached; Y represents: ##STR19## R 1 represents a hydrogen atom, an alkyl group, a phenyl group or a substituted group thereof; R 2 represents a hydrogen atom, a lower alkyl group, a carbamoyl group, a carboxyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, or a substituted or unsubstituted amino group; R 3 and R 5 each represents an alkyl group, an aromatic ring group, a heterocyclic aromatic ring group or a substituted group thereof; R 4 represents a hydrogen atom, an alkyl group, a phenyl group or a substituted group thereof; Z 1 , Z 2 , Z 3 and Z 4 , which may be the same or different represents a hydrogen atom, a halogen atom, an alkyl group, a nitro group, an alkoxy group, an alkoxycarbonyl group or an aryloxycarbonyl group.

Claim 3

An electrophotographic light sensitive element comprising an electrophotographic light sensitive layer containing a disazo compound represented by general formula (I), (II) or (III) ##STR20## wherein: A represents: ##STR21## wherein X represents an atomic group necessary to complete an aromatic ring or a heterocyclic ring (said ring may be substituted or unsubstituted), by condensing with the benzene ring in the above formula to which a hydroxy group and Y are attached; Y represents: ##STR22## R 1 represents a hydrogen atom, an alkyl group, a phenyl group or a substituted group thereof; R 2 represents a hydrogen atom, a lower alkyl group, a carbamoyl group, a carboxyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, or a substituted or unsubstituted amino group; R 3 and R 5 each represents an alkyl group, an aromatic ring group, a heterocyclic aromatic ring group or a substituted group thereof; R 4 represents a hydrogen atom, an alkyl group, a phenyl group or a substituted group thereof; Z 1 , Z 2 , Z 3 and Z 4 , which may be the same or different, represents a hydrogen atom, a halogen atom, an alkyl group, a nitro group, an alkoxy group, an alkoxycarbonyl group or an aryloxycarbonyl group.

Claim 4

An electrophotographic light sensitive element comprising an electrophotographic light sensitive layer containing a disazo compound represented by general formula (I), (II) or (III) ##STR20## wherein: A represents: ##STR21## wherein X represents an atomic group necessary to complete an aromatic ring or a heterocyclic ring (said ring may be substituted or unsubstituted), by condensing with the benzene ring in the above formula to which a hydroxy group and Y are attached; Y represents: ##STR22## R 1 represents a hydrogen atom, an alkyl group, a phenyl group or a substituted group thereof; R 2 represents a hydrogen atom, a lower alkyl group, a carbamoyl group, a carboxyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, or a substituted or unsubstituted amino group; R 3 and R 5 each represents an alkyl group, an aromatic ring group, a heterocyclic aromatic ring group or a substituted group thereof; R 4 represents a hydrogen atom, an alkyl group, a phenyl group or a substituted group thereof; Z 1 , Z 2 , Z 3 and Z 4 , which may be the same or different, represents a hydrogen atom, a halogen atom, an alkyl group, a nitro group, an alkoxy group, an alkoxycarbonyl group or an aryloxycarbonyl group.

Claim 5

An electrophotographic light sensitive element, as claimed in claim 2, wherein the electrophotographic light sensitive layer is provided on a photoconductive support.

Claim 6

An electrophotographic light sensitive element as claimed in claim 2, wherein the electrophotographic light sensitive layer comprises a binder or a charge transporting medium and disazo compounds represented by the general formula (I), (II) or (III) dispersed therein.

Claim 7

An electrophotographic light sensitive element as claimed in claim 2, wherein the light sensitive layer comprises a charge generating layer containing disazo compounds represented by the general formula (I), (II) or (III) and a charge transporting layer.

Claim 8

An electrophotographic light sensitive element as claimed in claim 4, wherein the electrophotographic light sensitive layer has a thickness in the range of 3 to 30μ.

Claim 9

An electrophotographic light sensitive element as claimed in claim 2, wherein the disazo compounds are present in the form of particles having a size of 5μ or less.

Claim 10

An electrophotographic light sensitive element as claimed in claim 4, wherein the electrophotographic light sensitive layer includes a binder and the disazo compounds which are present in the electrophotographic light sensitive layer in a weight amount of 0.01 to 5 times the weight of the binder.

Claim 11

An electrophotographic light sensitive element as claimed in claim 5, wherein the charge generating layer has a thickness of 4μ or less.

Claim 12

An electrophotographic light sensitive element as claimed in claim 5, wherein the disazo compounds are present in the charge generating layer in a weight amount of 0.1 or more times the weight of the binder.