Electrophotographic element with carbazole hydrazone or anile charge transport compounds

An electrophotographic element comprising:

• an electrically conductive substrate;
• a charge generation layer, which includes a photoconductive material selected from the group consisting of azo pigments having a carbazole group, azo pigments having a styrylstilbene group, azo pigments having a triphenylamine group, azo pigments having a dibenzothiophene group, azo pigments having an oxadiazole group, azo pigments having a fluorenone group, azo pigments having a bis-stilbene group, azo pigments having a distyryl-oxadiazole group and azo pigments having a distyrylcarbazole group;
• and a charge transport layer, which comprises at least one charge transport compound selected from the group consisting of hydrazone compounds having the following formula (I) and anile compounds having the following formula (II):
• ##STR27## wherein R.sub.1 is methyl, ethyl, 2-hydroxyethyl or 2-chloroethyl;
• R.sub.2 is methyl, ethyl, benzyl or phenyl;
• and R.sub.3 is chlorine, bromine, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, dialkylamino in which the alkyl has 1 to 4 carbon atoms or nitro, ##STR28## wherein R.sub.1 has the same meaning as defined above, and R.sub.4 is substituted phenyl, non-substituted phenyl, naphthyl, a heterocyclic group or C.sub.1 -C.sub.10 alkyl;
• and a binder agent.

In an electrophotographic element comprising a photoconductive layer and an electrically conductive substrate for supporting said photoconductive layer thereon, the improvement wherein said photoconductive layer contains a binder agent and at least one compound selected from the group consisting of hydrazone compounds having the following formula (I) and anile compounds having the following formula (II):

• ##STR29## wherein R.sub.1 is methyl, ethyl, 2-hydroxyethyl or 2-chloroethyl;
• R.sub.2 is methyl, ethyl, benzyl or phenyl;
• and R.sub.3 is chlorine, bromine, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, dialkylamino in which the alkyl has 1 to 4 carbon atoms or nitro, ##STR30## wherein R.sub.1 has the same meaning as defined above, and R.sub.4 is substituted phenyl, non-substituted phenyl, naphthyl, a heterocyclic group or C.sub.1 -C.sub.10 alkyl;
• and the thickness of said photoconductive layer is in the range of about 3 microns to 50 microns and the content of said hydrazone or anile compound is in the range of about 30 to 70 wt. % in said photoconductive layer.

In an electrophotographic element comprising a photoconductive layer and an electrically conductive substrate for supporting said photoconductive layer thereon, the improvement wherein said photoconductive layer comprises:

• a charge transport medium comprising a binder agent, a charge transport compound selected from the group consisting of hydrazone compounds having the following formula (I) and anile compounds having the following formula (II):
• ##STR31## wherein R.sub.1 is methyl, ethyl, 2-hydroxyethyl or 2-chloroethyl;
• R.sub.2 is methyl, ethyl, benzyl or phenyl;
• and R.sub.3 is chlorine, bromine, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, dialkylamino in which the alkyl has 1 to 4 carbon atoms or nitro, ##STR32## wherein R.sub.1 has the same meaning as defined above, and R.sub.4 is substituted phenyl, non-substituted phenyl, naphthyl, a heterocyclic group or C.sub.1 -C.sub.10 alkyl;
• and a charge generation material dispersed in said charge transport medium, the thickness of said photoconductive layer being in the range of about 3 microns to 50 microns, the content of said charge transport compound being in the range of about 10 to 95 weight percent in said photoconductive layer, and the content of said charge generation material being in the range of about 0.1 to 50 weight percent in said photoconductive layer.