Patent ID: 8343697

Claim:
An electrophotographic photoconductor containing at least a charge generation material and a charge transport material on a conductive support, the electrophotographic photoconductor being formed by laminating on the conductive support a monolayer type photosensitive layer containing the charge generation material and the charge transport material or a laminate type photosensitive layer in which a charge generation layer containing the charge generation material and a charge transport layer containing the charge transport material are laminated in this order; the photoconductor comprising a diamine compound represented by the formula (1): wherein Ar 1 , Ar 2 , Ar 3 and Ar 4 each independently represent an aryl, cycloalkyl or monovalent heterocyclic group which may have substituent(s); Y 1 , Y 2 , Y 3 , Y 4 , Y 5 and Y 6 each independently represent a straight chain alkylene group which may have substituent(s); Z is represented by i]] —Ar 5 —, ii] —Ar 5 —Ar 6 — or iii] —Ar 5 —W—Ar 6 — wherein Ar 5 and Ar 6 each independently represent an arylene group or divalent heterocyclic residue which may have substituent(s); and W represents an oxygen atom, a sulfur atom or a straight or branched chain or cyclic alkylene group which may have substituent(s), and also a polyarylate resin having a structural unit represented by the following formula (1): wherein X 1 represents a connecting group or —CR 5 R 6 — wherein R 5 and R 6 each independently represent a hydrogen atom, a halogen atom or an alkyl or aryl group which may have substituent(s) or R 5 and R 6 may be combined together with the carbon atom with which these groups are connected to form a cyclic structure; R 1 , R 2 , R 3 and R 4 each independently represent a hydrogen atom, a halogen atom or an alkyl or aryl group which may have substituent(s); R 7 , R 8 , R 9 and R 10 each independently represent a hydrogen atom, a halogen atom or an alkyl or aryl group which may have substituent(s); wherein the photoconductor contains the charge transport material and the diamine compound in a ratio J/T ranged between 0.01/100 or more and 10.0/100 or less, and wherein J represents a weight of the diamine compound; and T represents a weight of the charge transport material contained in the monolayer type photosensitive layer when the monolayer type photosensitive layer is used; or contained in the charge transport layer when the laminate type photosensitive layer is used.