# US 8,785,089 B2 · Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,785,089 B2 - Document ID: US8785089B2 - Status: Granted - Kind: B2 - Application number: 13/514,146 - Filed: 2010-12-02 - Published: 2012-09-27 - Granted: 2014-07-22 - Earliest claimed: 2009-12-09 - Assignees: Canon Kabushiki Kaisha - Applicants: Atsushi Okuda; Tsutomu Nishida - Inventors: Atsushi Okuda; Tsutomu Nishida - Web page: https://patentgrep.com/patent/US8785089B2 ## CPC - G03G 5/0564: {Polycarbonates} - G03G 5/056: {Polyesters} - G03G 5/0578: {Polycondensates comprising silicon atoms in the main chain} - G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY ## Abstract The present invention provides an electrophotographic photosensitive member, and a process cartridge and an electrophotographic apparatus, each of which has the electrophotographic photosensitive member. In the electrophotographic photosensitive member, a charge transport layer used as a surface layer contains a charge transport material, a polycarbonate resin A which has a specific amount of a specific repeating structural unit of a specific siloxane moiety, and a polyester resin C and/or a polycarbonate resin D, each of which has a specific repeating structural unit. In the charge transport layer, a matrix-domain structure is formed in which a matrix is formed from the charge transport material and the polyester resin C and/or the polycarbonate resin D, and domains are formed in the above matrix from the polycarbonate resin A. ## Claims ### Claim 1 An electrophotographic photosensitive member comprising: a conductive support; a charge generation layer provided on the conductive support; and a charge transport layer which is provided on the charge generation layer, and wherein the charge transport layer is a surface layer, wherein the charge transport layer contains: the charge transport material; a polycarbonate resin A having a repeating structural unit represented by the following formula (1) or (101), a repeating structural unit represented by the following formula (2), and a repeating structural unit represented by the following formula (3); and at least one of a polyester resin C having a repeating structural unit represented by the following structural unit (C) and a polycarbonate resin D having a repeating structural unit represented by the following formula (D); the content of a siloxane moiety in the polycarbonate resin A is 10 to 40 percent by mass to the total mass of the polycarbonate resin A, the content of the repeating structural unit represented by the following formula (2) in the polycarbonate resin A is 5 to 50 percent by mass to the total mass of the polycarbonate resin A, and the charge transport layer has a matrix-domain structure including a matrix formed from the charge transport material and at least one of the polyester resin C and the polycarbonate resin D and domains formed in the matrix from the polycarbonate resin A, where in the formula (1), Y1 represents a single bond or a substituted or an unsubstituted alkylene group, and W1 and W2 independently represent a monovalent group represented by the following formula (a) or (b): where in the formulas (a) and (b), Z1 to Z3 independently represent a substituted or an unsubstituted alkyl group having 1 to 4 carbon atoms, Z4 and Z5 independently represent a substituted or an unsubstituted alkylene group having 1 to 4 carbon atoms, R41 to R47 independently represent a substituted or an unsubstituted alkyl group or a substituted or an unsubstituted aryl group, and n, m, and k independently represent the average repeat number of the structure in the parentheses, n is 10 to 150, and m+k is 10 to 150, where in the formula (101), R151 to R153 independently represent a hydrogen atom, a substituted or an unsubstituted alkyl group, or a substituted or an unsubstituted aryl group, and W3 represents a monovalent group represented by the following formula (e) or (f): where in the formulas (e) and (f), Z101 to Z103 independently represent a substituted or an unsubstituted alkyl group having 1 to 4 carbon atoms, Z104 and Z105 independently represent a substituted or an unsubstituted alkylene group having 1 to 20 carbon atoms, R141 to R147 independently represent a substituted or an unsubstituted alkyl group or a substituted or an unsubstituted aryl group, and p, q, and s independently represent the average repeat number of the structure in the parentheses, p is 10 to 150, and q+s is 10 to 150, where in the formula (2), R1 to R8 independently represent a hydrogen atom or a substituted or an unsubstituted alkyl group, and Y5 represents an oxygen atom or a sulfur atom, where in the formula (3), R11 to R18 independently represent a hydrogen atom or a substituted or an unsubstituted alkyl group, and Y4 represents a single bond or a substituted or an unsubstituted alkylene group, where in the formula (C), R21 to R28 independently represent a hydrogen atom or a substituted or an unsubstituted alkyl group, X3 represents a substituted or an unsubstituted alkylene group, a substituted or an unsubstituted arylene group, a substituted or an unsubstituted biphenylene group, or a divalent group in which at least two phenylene groups are bonded to each other with an alkylene group or an oxygen atom interposed therebetween, and Y2 represents a single bond or a substituted or an unsubstituted alkylene group, where in the formula (D), R31 to R38 independently represent a hydrogen atom, or a substituted or an unsubstituted alkyl group, and Y3 represents a single bond, or a substituted or an unsubstituted alkylene group. ### Claim 2 (depends on 1) The electrophotographic photosensitive member according to claim 1, wherein the content of the siloxane moiety of the polycarbonate resin A in the charge transport layer is in a range of 2 to 20 percent by mass to the total mass of the polycarbonate resin A, the polyester resin C, and the polycarbonate resin D, each of which is in the charge transport layer. ### Claim 3 (depends on 1) The electrophotographic photosensitive member according to claim 1, wherein n in the formula (1) or (101) is in a range of 20 to 100. ### Claim 4 (depends on 1) A process cartridge comprising: the electrophotographic photosensitive member according to claim 1; and at least one unit selected from the group consisting of a charging unit, a developing unit, a transfer unit, and a cleaning unit, wherein the electrophotographic photosensitive member and the at least one unit are integrally supported and are detachably mountable to a main body of an electrophotographic apparatus. ### Claim 5 (depends on 1) An electrophotographic apparatus comprising: the electrophotographic photosensitive member according to claim 1, a charging unit, an exposure unit, a developing unit, and a transfer unit.