Patent ID: 8846281
Filing Date: 2014-09-30
Classification: G03G

Abstract:
1. An electrophotographic photosensitive member which comprises a support and a photosensitive layer provided on the support, wherein; a surface layer of the electrophotographic photosensitive member contains a silicon-containing compound in an amount of less than 0.6% by mass based on the whole solid content in the surface layer; the silicon-containing compound in the surface layer has a siloxane moiety in an amount of 0.01% by mass or more, based on the whole solid content in the surface layer; on the surface of the electrophotographic photosensitive member, depressions which are independent from one another are formed in a number of from 50 or more to 70,000 or less per unit area (100 μm ×100 μm), and the depressions are depressions each having a ratio of depth (Rdv) to major-axis diameter (Rpc), Rdv/Rpc, of from more than 0.3 to 7.0 or less and having a depth (Rdv) of from 0.1 μm or more to 10.0 μm or less; the surface layer has, at the outermost surface thereof, a silicon element in a presence proportion of 0.6% by mass or more, based on constituent elements thereat, as measured by X-ray photoelectron spectroscopy (ESCA); and the presence proportion [A (% by mass)] of the silicon element to the constituent elements in the surface layer at an inner part of 0.2 μm from the outermost surface thereof and the presence proportion [B (% by mass)] of the silicon element to the constituent elements at the outermost surface thereof as measured by X-ray photoelectron spectroscopy (ESCA) are in a ratio (A/B) of from more than 0.0 to less than 0.3; and the silicon-containing compound is a polymer having a structure represented by the following Formula (1) and a repeating structural unit represented by the following Formula (2) or the following Formula (3): wherein R wherein X represents a single bond, —O—, —S— or a substituted or unsubstituted alkylidene group; and R wherein X and Y each represent a single bond, —O—, —S— or a substituted or unsubstituted alkylidene group; and R