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Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus

  • US 9,760,030 B2
  • Filed: 10/19/2015
  • Issued: 09/12/2017
  • Est. Priority Date: 10/24/2014
  • Status: Active Grant
First Claim
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1. An electrophotographic photosensitive member, comprising:

  • a laminated body and a hole transporting layer on the laminated body, the laminated body comprising;

    a support;

    an undercoat layer having a thickness of d1 (μ

    m), on the support; and

    a charge generating layer having a thickness of d2 (μ

    m), on the undercoat layer, whereinthe hole transporting layer has a thickness of 15 μ

    m or less,the undercoat layer comprises a polymerized product of a composition including an electron transport material represented by formula (1), a cross-linking agent, and a thermoplastic resin having a polymerizable functional group;


    Z1

    X—

    Z2



    (1)in which Z1 and Z2 each represent a group having an electron transport property;

    X represents a linking group, and the linking group is a substituted or unsubstituted alkylene group, a substituted or unsubstituted arylene group, a substituted or unsubstituted heterocyclic group, or a group derived by substituting one of methylene groups in a main chain of the substituted or unsubstituted alkylene group with R1, the R1 representing an oxygen atom, a sulfur atom, SO2, NR2, CO, or a substituted or unsubstituted arylene group, the R2 representing a hydrogen atom, an alkyl group, or an aryl group; and

    at least one of Z1, Z2, and X has a polymerizable functional group, and the polymerizable functional group is a hydroxyl group, a thiol group, an amino group, a carboxyl group, or a methoxy group;

    when the charge generating layer of the laminated body is charged by corona charging so that a dark potential of a surface of the charge generating layer after 1.0 second from the corona charging being defined as Vd1, Vd1 satisfies expression (4)
    Vd1=−

    100×

    (d1+d2) 



    (4), anda dark potential of the surface of the charge generating layer after 0.80 second from the corona charging is defined as Vd2, Vd1 and Vd2 satisfies expression (2)
    0.20≦

    |Vd2−

    Vd1|≦

    2.0 



    (2), andwhen the surface of the charge generating layer which has a potential of Vd1 (V) is exposed to a laser light having a wavelength of 780 nm for 1 microsecond and a light intensity so that the potential of the surface of the charge generating layer decays by 20% with respect to Vd1 (V) after 0.04 second from the exposure to the laser light, and a transit time (ms) determined based on a time change rate of the potential of the surface of the charge generating layer after the exposure to the laser light is defined as τ

    , τ

    , satisfies expression (3);


    τ



    10 



    (3).

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