# US 5,350,654 A · Photoconductors employing sensitized extrinsic photogenerating pigments > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,350,654 A - Document ID: US5350654A - Status: Granted - Kind: A - Application number: 07/927,984 - Filed: 1992-08-11 - Granted: 1994-09-27 - Earliest claimed: 1992-08-11 - Assignees: Xerox Corporation - Inventors: Damodar M. Pai; Andrew R. Melnyk; Donald J. Teney - Web page: https://patentgrep.com/patent/US5350654A ## CPC - G03G 5/043: Photoconductive layers characterised by having two or more layers or characterised by their composite structure - G03G 5/047: characterised by the charge-generation layers or charge transport layers {(G03G5/0433 and G03G5/0436 take precedence)} - G03G 5/0659: {containing more than seven relevant rings} - G03G 5/09: Sensitisors or activators, e.g. dyestuffs (G03G5/12 takes precedence) - G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY ## Abstract A layered photoreceptor is composed of a substrate, an extrinsic pigment layer that has been sensitized disposed over the substrate, and a charge transport polymer in contact with the pigment layer. A method for producing a photoreceptor comprises depositing a layer of sensitizing electron donor material in a polymer binder on a substrate. An extrinsic pigment layer is deposited on the layer of sensitizing electron donor material. A charge transport layer is deposited on the pigment layer. ## Claims ### Claim 1 A layered photoreceptor comprised of: a substrate; an extrinsic pigment layer that has been sensitized by being in contact with electron donor molecules disposed over the substrate; and a charge transport layer comprised of a charge transporting polymer layer disposed over the pigment layer. ### Claim 2 (depends on 1) The photoreceptor according to claim 1, wherein said electron donor molecules are in a binder in the form of a layer between said substrate and said pigment layer. ### Claim 3 (depends on 1) The photoreceptor according to claim 1, wherein said electron donor molecules are dispersed within the extrinsic pigment layer. ### Claim 4 (depends on 1) The photoreceptor according to claim 1, wherein said electron donor molecules are in a binder in the form of a layer between said charge transport and said pigment layer. ### Claim 5 (depends on 1) The photoreceptor according to claim 1, wherein the sensitizing electron donor molecules are aryl amine molecules. ### Claim 6 (depends on 5) The photoreceptor according to claim 5 wherein the aryl amine molecules are selected from the group consisting of pyrazolines, monoamines, diamines, polyamines, hydrazones, oxadiazoles, triphenyl methanes and stilbenes. ### Claim 7 (depends on 1) The photoreceptor according to claim 1, wherein said pigment is selected from the group consisting of microcrystalline perylenes, and perinones. ### Claim 8 (depends on 7) The photoreceptor according to claim 7, wherein said pigment is benzimidazole perylene. ### Claim 9 (depends on 1) The photoreceptor according to claim 1, wherein the charge transporting polymer is comprised of a polyvinylarylamine. ### Claim 10 (depends on 1) The photoreceptor according to claim 1, wherein the charge transporting polymer is comprised of a of polysilylene. ### Claim 11 (depends on 1) The photoreceptor according to claim 1, wherein the charge transport layer is comprised of a polyarylamine. ### Claim 12 (depends on 1) The photoreceptor according to claim 1, wherein said charge transport layer is comprised of at least one member of the group consisting of pyrazolines, diamines, hydrazones, oxadiazoles, triphenyl methanes and inactive stilbenes in a polymer binder. ### Claim 13 (depends on 1) The photoreceptor according to claim 1, wherein the layer of sensitizing electron donor molecules is from about 0.01 to about 1 micrometers thick. ### Claim 14 (depends on 13) The photoreceptor according to claim 13, wherein the layer of sensitizing electron donor materials is 0.1 micrometers thick. ### Claim 15 (depends on 1) The photoreceptor according to claim 1, wherein said pigment layer is from about 0.05 to about 5 micrometers thick. ### Claim 16 (depends on 15) The photoreceptor according to claim 15, wherein the pigment layer is about 0.5 micrometers thick. ### Claim 17 (depends on 1) The photoreceptor according to claim 1, which further comprises an adhesive layer between the substrate and the electron donor molecules. ### Claim 18 A photoreceptor comprised of a conducting substrate; a charge generator layer of extrinsic pigment disposed over said substrate; a sensitizing layer comprised of electron donor molecules in contact with said charge generator layer; and a charge transport layer disposed on said sensitizing layer. ### Claim 19 A method for producing a photoreceptor comprising: depositing a layer of sensitizing electron donor material in a polymer binder on a substrate; depositing an extrinsic pigment layer on the layer of sensitizing electron donor material; and depositing a charge transport layer comprising a charge transporting polymer on said pigment layer. ### Claim 20 An imaging process comprising; providing an electrophotographic imaging member comprised of a sensitizer layer, a charge generating layer and a charge transport layer, said charge sensitizer layer comprising electron donor molecules in an binder; depositing a uniform electrostatic charge on said imaging member with a corona charging device; exposing said imaging member to activating radiation in image configuration to form an electrostatic latent image on said imaging member; developing said electrostatic latent image with electrostatically attractable marking particles to form a toner image; transferring said toner image to a receiving member; and repeating said depositing, exposing, developing and transferring steps.