Patent ID: 7534539

Claim:
An electrophotographic photoreceptor comprising: a conductive substrate composed of a conductive material; and a photosensitive layer disposed on the conductive substrate and containing an enamine compound represented by the following general formula (1), and a hindered phenol compound having a hindered phenol structural unit as an antioxidant and a light stabilizer selected from the group consisting of HA-3, HA-10 and X-16: wherein Ar 1 and Ar 2 each represent 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, a 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 a substituent, an alkoxy group which may have a substituent, an 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, said HA-3, HA-10 and X-16 having the following structures: respectively.