Patent ID: 7901855

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 binder 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 polyester resin having a repeating structural unit represented by the following formula (1) and a repeating structural unit represented by the following formula (2), as a binder resin; the content of a siloxane moiety in the polyester resin is not less than 5% by mass and not more than 30% by mass relative to the total mass of the polyester resin, the siloxane moiety is a structure represented by the following formula: wherein R 1 and R 2 each independently represent a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group; and n represents an average number of repetitions of a structure within the brackets, ranging from 20 or more and 80 or less; and the content of the polyester resin in the charge transport layer is not less than 60% by mass relative to the total mass of the whole binder resin in the charge transport layer, 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 80 or less, 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.