# US 8,771,910 B2 · Electrophotographic photoreceptor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,771,910 B2 - Document ID: US8771910B2 - Status: Granted - Kind: B2 - Application number: 13/715,359 - Filed: 2012-12-14 - Published: 2013-06-20 - Granted: 2014-07-08 - Earliest claimed: 2011-12-20 - Assignees: Konica Minolta Business Technologies, Inc. - Applicants: Toshiyuki Fujita; Hirofumi Hayata - Inventors: Toshiyuki Fujita; Hirofumi Hayata - Web page: https://patentgrep.com/patent/US8771910B2 ## CPC - G03G 5/043: Photoconductive layers characterised by having two or more layers or characterised by their composite structure - G03G 5/0433: {all layers being inorganic} - G03G 5/14704: {comprising inorganic material} - G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY ## Abstract Disclosed is an electrophotographic photoreceptor including a conductive supporting body, a photosensitive layer and a protective layer. In the electrophotographic photoreceptor, at least the photosensitive layer and the protective layer are sequentially layered on the conductive supporting body, and the protective layer includes P-type semiconductor particles. ## Claims ### Claim 1 An electrophotographic photoreceptor, comprising: a conductive supporting body; a photosensitive layer; and a protective layer, wherein at least the photosensitive layer and the protective layer are sequentially layered on the conductive supporting body, the protective layer includes P-type semiconductor particles, and the P-type semiconductor particles are a compound ex pressed by a general formula (1) CuMO2 General formula (1) wherein M is an element of group 13 in periodic table. ### Claim 2 (depends on 1) The electrophotographic photoreceptor according to claim 1, wherein the P-type semiconductor particles are particles selected from CuAlO2, CuGaO2 and CuInO2. ### Claim 3 (depends on 1) The electrophotographic photoreceptor according to claim 1, wherein the protective layer further includes a component obtained by curing a curable compound. ### Claim 4 (depends on 3) The electrophotographic photoreceptor according to claim 3, wherein the curable compound is a polymerizable monomer including at least either of an acryloyl group and a methacryloyl group in a molecule thereof. ### Claim 5 (depends on 1) The electrophotographic photoreceptor according to claim 1, wherein the P-type semiconductor particles are treated with a surface processing agent including a reactive organic group. ### Claim 6 (depends on 1) The electrophotographic photoreceptor according to claim 1, wherein a number average primary particle size of the P-type semiconductor particles is between 1 nm or more and 300 nm or less. ### Claim 7 (depends on 1) The electrophotographic photoreceptor according to claim 1, wherein the P-type semiconductor particles are particles prepared by a plasma method. ### Claim 8 An electrophotographic photoreceptor, comprising: a conductive supporting body; a photosensitive layer; and a protective layer, wherein at least the photosensitive layer and the protective layer are sequentially layered on the conductive supporting body, and the protective layer includes P-type semiconductor particles and a component obtained by curing a curable compound. ### Claim 9 (depends on 8) The electrophotographic photoreceptor according to claim 8, wherein the P-type semiconductor particles are treated with a surface processing agent including a reactive organic group. ### Claim 10 (depends on 8) The electrophotographic photoreceptor according to claim 8, wherein the curable compound is a polymerizable monomer including at least either of an acryloyl group and a methacryloyl group in a molecule thereof. ### Claim 11 (depends on 8) The electrophotographic photoreceptor according to claim 8, wherein a number average primary particle size of the P-type semiconductor particles is between 1 nm or more and 300 nm or less. ### Claim 12 (depends on 8) The electrophotographic photoreceptor according to claim 8, wherein the P-type semiconductor particles are particles prepared by a plasma method. ### Claim 13 An electrophotographic photoreceptor, comprising: a conductive supporting body; a photosensitive layer; and a protective layer, wherein at least the photosensitive layer and the protective layer are sequentially layered on the conductive supporting body, and the protective layer includes P-type semiconductor particles and a binder resin. ### Claim 14 (depends on 13) The electrophotographic photoreceptor according to claim 13, wherein the binder resin is a polyester resin, a polycarbonate resin, a polyurethane resin or a silicone resin. ### Claim 15 (depends on 14) The electrophotographic photoreceptor according to claim 14, wherein the binder resin is a polycarbonate resin. ### Claim 16 (depends on 13) The electrophotographic photoreceptor according to claim 13, wherein the photosensitive layer has a layer configuration where a charge generation layer and a charge transport layer are sequentially layered on a conductive support body or a layer configuration where a single layer including a charge transport material and a charge generation material is layered on the conductive supporting body. ### Claim 17 (depends on 16) The electrophotographic photoreceptor according to claim 16, wherein the photosensitive layer has the layer configuration where the charge generation layer and the charge transport layer are sequentially layered on the conductive support body. ### Claim 18 (depends on 13) The electrophotographic photoreceptor according to claim 13, wherein the P-type semiconductor particles are a compound expressed by a general formula (1) CuMO2 General formula (1) wherein M is an element of group 13 in periodic table. ### Claim 19 (depends on 13) The electrophotographic photoreceptor according to claim 13, wherein a number average primary particle size of the P-type semiconductor particles is between 1 nm or more and 300 nm or less.