ELECTROPHOTOGRAPHIC PHOTORECEPTOR, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS

摘要

An electrophotographic photoreceptor includes a cylindrical conductive substrate, an undercoat layer containing a cured product of a resin and a blocked isocyanate and being disposed on the conductive substrate, and a photosensitive layer on the undercoat layer. The degree of curing of the undercoat layer defined by the equation below is about 1.5 or less in both a region A and a region B defined below:;Region A (B): A region between a position distant from a first (second) end of the conductive substrate by about ⅛ of a length of the conductive substrate and a position distant from the first (second) end of the conductive substrate by about ⅕ of the length of the conductive substrate;Degree of curing=[Amount (g) of blocking agent separated from blocked isocyanate in undercoat layer]/weight of undercoat layer (g)×100.

主权项

1. An electrophotographic photoreceptor comprising:
a cylindrical conductive substrate; an undercoat layer containing a cured product of a resin and a blocked isocyanate and having a degree of curing of about 1.5 or less in both a region A and a region B defined below, the degree of curing being determined from an equation below; and a photosensitive layer, wherein the undercoat layer is disposed on the cylindrical conductive substrate and the photosensitive layer is disposed on the undercoat layer, Region A: A region that lies between a position distant from a first end of the conductive substrate by about ⅛ of a length of the conductive substrate toward a center portion in an axis direction and a position distant from the first end of the conductive substrate by ⅕ or about ⅕ of the length of the conductive substrate toward the center portion in the axis direction Region B: A region that lies between a position distant from a second end of the conductive substrate by ⅛ or about ⅛ of the length of the conductive substrate toward the center portion in the axis direction and a position distant from the second end of the conductive substrate by ⅕ or about ⅕ of the length of the conductive substrate toward the center portion in the axis direction
Degree of curing=[Amount (g) of blocking agent separated from blocked isocyanate in undercoat layer]/weight of undercoat layer (g)×100.