Patent ID: 7588871

Claim:
An electrophotographic photoreceptor comprising: a conductive substrate; and a photosensitive layer disposed on the conductive substrate, containing a charge generating substance and a charge transporting substance, wherein the charge transporting substance contains an enamine compound represented by the following general formula (1), and in a case where a maximum indentation load of 30 mN is put on a surface for 5 seconds under circumstances of temperature of 25° C. and relative humidity of 50%, a creep value (C IT ) is 2.70% or more and 5.00% or less and a plastic deformation hardness value (Hplast) of the surface is 220 N/mm 2 or more and 275 N/mm 2 or less, wherein Ar 1 represents an aryl group which may have a substituent or a heterocyclic group which may have a substituent; Ar 2 represents an aryl group which may have a substituent or a heterocyclic group which may have a substituent; Ar 3 represents an aryl group which may have a substituent, a heterocyclic group which may have a substituent, an aralkyl group which may have a substituent, or an alkyl group which may have a substituent; Ar 4 and Ar 5 each represent a hydrogen atom, an aryl group which may have a substituent, a heterocyclic group which may have a substituent, an aralkyl group which may have a substituent, or an alkyl group which may have a substituent, but it is excluded that Ar 4 and Ar 5 are hydrogen atoms at the same time; Ar 4 and Ar 5 may bond to each other via an atom or an atomic group to form a cyclic structure; “a” represents an alkyl group which may have ha substituent, an alkoxy group which may have a substituent, a dialkylamino group which may have a substituent, an aryl group which may have a substituent, a halogen atom, or a hydrogen atom; m indicates an integer of from 1 to 6; when m is 2 or more, then the “a”s may be the same or different and may bond to each other to form a cyclic structure; R 1 represents a hydrogen atom, a halogen atom, or an alkyl group which may have a substituent; R 2 , R 3 and R 4 each represent a hydrogen atom, an alkyl group which may have a substituent, an aryl group which may have a substituent, a heterocyclic group which may have a substituent, or an aralkyl group which may have a substituent; n indicates an integer of from 0 to 3; when n is 2 or 3, then the R 2 s may be the same or different and the R 3 s may be the same or different, but when n is 0, Ar 3 is a heterocyclic group which may have a substituent.