Patent ID: 7875410

Claim:
An electrophotographic photosensitive member comprising a support, a charge generation layer provided on the support and a charge transport layer containing a charge transporting material and a resin formed on the charge generation layer, the charge transport layer serving as a surface layer of the electrophotographic photosensitive member, wherein: the charge transport layer contains a charge transporting material, a polyester resin A having a repeating structural unit represented by the following formula (1) and a repeating structural unit represented by the following formula (2), and at least one of polyester resin C having a repeating structural unit represented by the following formula (C) and polycarbonate resin D having a structural unit represented by the following formula (D); the content of a siloxane moiety in the polyester resin A is not less than 10% by mass and not more than 40% by mass relative to the total mass of the polyester resin A; and the charge transport layer has a matrix-domain structure having a matrix formed of the charge transporting material and at least one of the polyester resin C and the polycarbonate resin D, and a domain formed of the polyester resin A in the matrix, where, in formula (1), X 1 represents a divalent organic group; R 1 and R 2 each independently represent a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group; Z represents a substituted or unsubstituted alkylene group having 1 or more and 4 or less carbon atoms; and n represents an average number of repetitions of a structure within the brackets, ranging from 20 or more and 150 or less, wherein the siloxane moiety is the structural unit represented by the following formula in the above formula (1) where, in formula (2), R 11 to R 18 each independently represent a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group or a substituted or unsubstituted alkoxy group; X 2 represents a divalent organic group; and Y represents a single bond, a substituted or unsubstituted alkylene group, a substituted or unsubstituted arylene group, an oxygen atom or a sulfur atom, where, in formula (C), R 21 to R 28 each independently represent a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group or a substituted or unsubstituted alkoxy group; X 3 represents a divalent organic group; and Y 2 represents a single bond, a substituted or unsubstituted alkylene group, a substituted or unsubstituted arylene group, an oxygen atom or a sulfur atom, where, in formula (D), R 31 to R 38 each independently represent a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group or a substituted or unsubstituted alkoxy group; and Y 3 represents a single bond, a substituted or unsubstituted alkylene group, a substituted or unsubstituted arylene group, an oxygen atom or a sulfur atom.