Hydrazone containing charge transport element and photoconductive process of using same
AssigneeInternational Business Machines Corporation
InventorsHoward W. Anderson, Michael T. Moore
Life of this patent
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Abstract
A process for electrophotographic reproduction, and a layered electrophotographic plate having a conventional charge generation layer and a p-type hydrazone containing charge transport layer, in which the surface of the charge transport layer is selectively discharged by actinic radiation as a result of the migration through the transport layer of charges generated in the charge generation layer as a result of the actinic radiation and injected into the transport layer, the hydrazone having the composition; ##STR1##
Claims21
A electrophotographic element comprising;
- an electrically conductive layer;
- a charge generation layer responsive to actinic radiation to generate an electron-hole pair;
- and
- a p-type charge transport layer adjacent the charge generation layer, the charge transport layer comprising a hydrazone of the composition;
- ##STR24## and a polymeric binder;
- whereby holes generated by photoelectric phenomenon in the charge generation layer may be transported through the charge transport layer to facilitate localized selective discharge of charged surfaces of the element.
An electrophotographic element comprising, in successive layers;
- a conductive substrate;
- a charge generation layer responsive to actinic radiation of a wave length greater than 3,900 angstroms to generate an electron-hole pair, the charge generation layer including a photoconductor selected from the group consisting of Chlorodiane Blue, methyl squarylium and hydroxy squarylium;
- and
- a p-type charge transport layer, the charge transport layer being comprised of a hydrazone of the composition;
- ##STR25## and a polymeric binder.
A method for forming an electrophotographic image comprising the steps of;
- electrostatically charging in the dark the surface of an electrophotographic plate comprising;
- a conductive substrate, a charge generation layer responsive to actinic radiation to generate an electron-hole pair, and a p-type charge transport layer adjacent the charge generation layer, the charge transport layer comprising a hydrazone of the composition;
- ##STR26## and a polymeric binder;
- exposing the electrophotographic element to an image-wise pattern of actinic radiation;
- and
- discharging the surface of the electrophotographic element in an image-wise fashion corresponding to the pattern of the actinic radiation to produce a latent electrostatic image thereon;
- whereby an electron-hole pair is generated in the charge generation layer at the portion struck by the actinic radiation and the hole is injected into the charge transport layer to discharge the surface of the electrophotographic element.
An electrophotographic process comprising;
- negatively charging in the dark the surface of an electrophotographic element comprising in ordered layers;
- a conductive substrate, a charge generation layer responsive to actinic radiation to generate an electron hole pair and including a photoconductive material selected from the group consisting of Chlorodiane Blue, methyl squarylium and hydroxy squarylium, and a p-type charge transport layer including p-diethylaminobenzaldehyde-(diphenylhydrazone) and a polymeric binder;
- exposing the electrophotographic element to an image-wise pattern of actinic radiation;
- and
- discharging the negative charge in the image-wise pattern corresponding to the pattern of the actinic radiation by combining the hole transported through the charge transport layer and a localized negative charge to produce an electrostatic image at the surface of the electrophotographic element.
Dependencies are inferred from the claim text.