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ELECTROPHOTOGRAPHIC PHOTOSENSITIVE MEMBER, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC APPARATUS

  • US 20160116853A1
  • Filed: 10/19/2015
  • Published: 04/28/2016
  • 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,wherein;

    the laminated body comprises;

    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;

    the 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 the following formula (1), a cross-linking agent, and a thermoplastic resin having a polymerizable functional group;


    Z1

    X—

    Z2



    (1)in the formula (1);

    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;

    the laminated body satisfies the following expressions (2) and (4);


    0.20≦

    |Vd2−

    Vd1|≦

    2.0 



    (2)
    Vd1=−

    100×

    (d1+d2) 



    (4)in which Vd1 represents a potential of a surface of the charge generating layer after 1.0 second from charging of the charge generating layer by corona charging, and Vd2 represents a potential of the surface of the charge generating layer after 0.80 second from the charging of the charge generating layer by the corona charging; and

    τ

    satisfies the following expression (3);


    τ



    10 



    (3)in the expression (3), τ

    represents transit time (ms) determined based on a time change rate of the potential of the surface of the charge generating layer after the surface of the charge generating layer which has a potential of Vd1 (V) is exposed to light, the light having an intensity adjusted so that the potential of the surface of the charge generating layer after 0.04 second from the exposure decays by 20% with respect to Vd1 (V).

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