Electrophotographic photoconductor and diamine compounds for use in the same

An electrophotographic photoconductor comprising an electroconductive support and a photoconductive layer formed thereon comprising as an effective component at least one diamine compound represented by the formula (1a):

• ##STR233## wherein R.sup.1, R.sup.2 and R.sup.3 each is independently a substituted or unsubstituted alkyl group or not including pyrenyl aryl group;
• R.sup.4 is hydrogen, a halogen atom, methoxy group or methyl group;
• R.sup.5 is hydrogen or methyl group;
• R.sup.4 is hydrogen, an alkyl group or an alkoxyl group;
• and n is an integer of 1 to 3, said photoconductive layer comDrising Said diamine compound, a sensitizer lye and a binder, or said photoconductive laver comprising a charge generating material and a charge transporitng material which comrpises said diamine compound and a binder.