# US 2013/0252147 A1 · Electrophotographic photoreceptor, process cartridge, and image forming apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0252147 A1 - Document ID: US20130252147A1 - Status: Published application - Kind: A1 - Application number: 13/561,535 - Filed: 2012-07-30 - Published: 2013-09-26 - Earliest claimed: 2012-03-23 - Assignees: Fuji Xerox Co., Ltd. - Inventors: Satoya SUGIURA; Shigeto HASHIBA; Kazuhiro KOSEKI; Hirofumi NAKAMURA; Kenta IDE; Akihiro NONAKA; Kosuke NARITA; Akihiro KAWASAKI - Web page: https://patentgrep.com/patent/US20130252147A1 ## CPC - G03G 5/144: {comprising inorganic material} - G03G 5/0539: {Halogenated polymers} - G03G 5/0542: {Polyvinylalcohol, polyallylalcohol; Derivatives thereof, e.g. polyvinylesters, polyvinylethers, polyvinylamines} - G03G 5/0564: {Polycarbonates} - G03G 5/061473: {plural alkenyl groups linked directly to the same aryl group} - G03G 5/0696: {Phthalocyanines} - G03G 5/142: {Inert intermediate layers} - G03G 5/14708: {comprising organic material} - G03G 5/14756: {Polycarbonates} - G03G 15/75: {Details relating to xerographic drum, band or plate, e.g. replacing, testing (electrographic recording members per se G03G5/00)} - G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY ## Abstract An electrophotographic photoreceptor includes a conductive support, and an undercoat layer, a charge generation layer, and a charge transport layer that are provided in this order on the conductive support, wherein the undercoat layer includes at least metallic oxide particles, a reactive acceptor substance including an anthraquinone structure expressed by the following Formula 1, and a binder resin, the charge generation layer includes hydroxygallium phthalocyanine as a charge generation material, and a reflectance of incident light having a wavelength of 780 nm on a surface of the charge generation layer when the charge transport layer is removed is 17% or greater: wherein the anthraquinone structure expressed by Formula 1 is bonded to another structure at a position of *, and thus forms the reactive acceptor substance, and in Formula 1, n1 represents an integer of 1 to 7. ## Claims ### Claim 1 An electrophotographic photoreceptor comprising: a conductive support; and an undercoat layer, a charge generation layer, and a charge transport layer that are provided in this order on the conductive support, wherein the undercoat layer includes at least metallic oxide particles, a reactive acceptor substance including an anthraquinone structure expressed by the following Formula 1, and a binder resin, the charge generation layer includes hydroxygallium phthalocyanine as a charge generation material, and a reflectance of incident light having a wavelength of 780 nm on a surface of the charge generation layer when the charge transport layer is removed is 17% or greater: wherein the anthraquinone structure expressed by Formula 1 is bonded to another structure at a position of *, and thus forms the reactive acceptor substance, and in Formula 1, n1 represents an integer of from 1 to 7. ### Claim 2 (depends on 1) The electrophotographic photoreceptor according to claim 1, wherein the reflectance is 20% or greater. ### Claim 3 (depends on 1) The electrophotographic photoreceptor according to claim 1, wherein in the Formula 1, n1 is 1 to 4. ### Claim 4 (depends on 1) The electrophotographic photoreceptor according to claim 1, wherein in the Formula 1, another structure bonded at the position of * is an alkoxy group. ### Claim 5 (depends on 1) The electrophotographic photoreceptor according to claim 1, wherein in the Formula 1, another structure bonded at the position of * is an alkoxy group having from 1 to 8 carbon atoms. ### Claim 6 (depends on 1) The electrophotographic photoreceptor according to claim 1, wherein an amount of the reactive acceptor substance added of the Formula 1 is 0.1% by weight to 10% by weight in the undercoat layer. ### Claim 7 (depends on 1) The electrophotographic photoreceptor according to claim 1, wherein an amount of the reactive acceptor substance added of the Formula 1 is 0.5% by weight to 5% by weight in the undercoat layer. ### Claim 8 (depends on 1) The electrophotographic photoreceptor according to claim 1, wherein the charge transport layer includes a compound that has a charge transport ability and has a butadiene structure expressed by the following Formula 2, and a polycarbonate copolymer including a repeating unit expressed by the following Formula 3 and a repeating unit expressed by the following Formula 4: wherein in Formula 2, R1, R2, R3, R4, R5, and R6 each may be the same as, or different from each other, and represent a hydrogen atom, an alkyl group, an alkoxy group, a halogen atom, or a substituted or unsubstituted aryl group, and m1 and n2 represent 0 or 1; wherein in Formulas 3 and 4, R7, R8, R9, and R10 each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 5 to 7 carbon atoms, or an aryl group having 6 to 12 carbon atoms, and X represents a phenylene group, a biphenylene group, a naphthylene group, a linear or branched alkylene group, or a cycloalkylene group. ### Claim 9 (depends on 8) The electrophotographic photoreceptor according to claim 8, wherein in the Formula 2, m1 and n2 are 1. ### Claim 10 (depends on 8) The electrophotographic photoreceptor according to claim 8, wherein in the Formula 4, X is a cycloalkylene group. ### Claim 11 (depends on 1) A process cartridge comprising: the electrophotographic photoreceptor according to claim 1; and at least one selected from the group consisting of a charging unit that charges a surface of the electrophotographic photoreceptor, a developing unit that develops an electrostatic latent image formed on the electrophotographic photoreceptor with a developer to form a toner image, and a toner removing unit that removes a toner remaining on the surface of the electrophotographic photoreceptor. ### Claim 12 (depends on 1) An image forming apparatus comprising: the electrophotographic photoreceptor according to claim 1; a charging unit that charges a surface of the electrophotographic photoreceptor; an electrostatic latent image forming unit that exposes the charged surface of the electrophotographic photoreceptor to form an electrostatic latent image; a developing unit that develops the electrostatic latent image with a developer to form a toner image; and a transfer unit that transfers the toner image onto a transfer medium. ### Claim 13 (depends on 12) The image forming apparatus according to claim 12, wherein the charging unit is a contact-type charging unit. ### Claim 14 (depends on 12) The image forming apparatus according to claim 12, wherein the charging potential by the contact-type charging unit is 650 V or greater in terms of absolute value. ### Claim 15 (depends on 12) The image forming apparatus according to claim 12, wherein the charging potential by the contact-type charging unit is 700 V or greater in terms of absolute value.