Electrophotographic element with a phenyhydrazone charge transport layer
AssigneeRicoh Company, Ltd.
InventorsKiyoshi Sakai, Mitsuru Hashimoto, Tomiko Kawakami
Life of this patent
Estimating the term…
Abstract
An electrophotographic element is prepared by forming a photoconductive layer containing a hydrazone compound therein on an electroconductive support member. The hydrazone compounds represented by the following general formula, are useful as photoconductive materials and as charge transport materials for use in electrophotography: ##STR1## wherein Ar represents a substituted or unsubstituted condensed polycyclic group or heterocyclic group, and R represents a methyl group, an ethyl group, a benzyl group or a phenyl group. The condensed polycyclic group includes a naphthalene ring, and an anthracene ring. The heterocyclic ring includes nitrogen, oxygen and sulfur.
Claims23
An electrophotographic element comprising:
- an electroconductive support member,
- a charge carrier producing layer,
- a charge transport layer adjacent the charge carrier producing layer, the charge transport layer comprising a hydrazone of the formula;
- ##STR49## wherein Ar represents a substituted or unsubstituted fused polycyclic hydrocarbon ring system, and R represents a methyl group, an ethyl group, a benzyl group or a phenyl group;
- and
- a binder agent.
An electrophotographic element comprising:
- an electroconductive support member;
- a charge carrier producing 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-phenyloxadiazole group and azo pigments having a distyrylcarbazole group;
- and
- a charge transport layer, which comprises a hydrazone of the formula;
- ##STR50## wherein Ar represents a substituted or unsubstituted fused polycyclic hydrocarbon ring system, and R represents a methyl group, an ethyl group, a benzyl group or a phenyl group;
- and
- a binder agent.
In an electrophotographic element comprising a photoconductive layer and an electroconductive support member for supporting said photoconductive layer thereon, the improvement wherein said photoconductive layer contains a binder agent and at least a compound selected from the group consisting of hydrazone compounds represented by the general formula ##STR51## where Ar represents a substituted or unsubstituted fused polycyclic hydrocarbon ring system, and R represents a methyl group, an ethyl group, a benzyl group or a phenyl group and the thickness of said photoconductive layer is in the range of 3 .mu.m to 50 .mu.m and the content of said hydrazone compound is in the range of 30 to 70 wt% in said photoconductive layer.
In an electrophotographic element comprising a photoconductive layer and an electroconductive support member for supporting said photoconductive layer thereon, the improvement wherein said photoconductive layer comprises:
- a charge transport medium comprising a binder agent and a compound selected from the group consisting of hydrazone compounds represented by the general formula ##STR52## wherein Ar represents a substituted or unsubstituted fused polycyclic hydrocarbon ring system, and R represents a methyl group, an ethyl group, a benzyl group or a phenyl group;
- and a charge carrier producing material dispersed in said charge transport medium, and the thickness of said photoconductive layer is in the range of 3 .mu.m to 50 .mu.m and the content of said hydrazone compound is in the range of 10 to 95 weight percent in said photoconductive layer, and the content of said charge carrier producing material is in the range of 0.1 to 50 weight percent in said photoconductive layer.
Dependencies are inferred from the claim text.