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ELECTROPHOTOGRAPHIC PHOTOSENSITIVE MEMBER, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC APPARATUS

  • US 20110158683A1
  • Filed: 09/24/2009
  • Published: 06/30/2011
  • Est. Priority Date: 09/26/2008
  • Status: Active Grant
First Claim
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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 μ



    100 μ

    m), 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 μ

    m or more to 10.0 μ

    m 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 μ

    m 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);

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