Electrophotographic photoconductor containing disazo and trisazo pigments

An electrophotographic photoconductor comprising an electroconductive support and a single-layered photoconductive layer formed thereon, comprising:

• (a) a charge transporting material,
• (b) a binder resin, and
• (c) a simultaneously pulverized mixture comprising at least one disazo pigment of formula (1) and at least one trisazo pigment of formula (2), which is obtained by simultaneously pulverizing said disazo pigment and said trisazo pigment:
• ##STR2034## wherein R.sup.1 and R.sup.2 each is hydrogen, a halogen atom, trifluoromethyl group, nitro group or cyano group;
• R.sup.3 is hydrogen, chlorine, fluorine, iodine, bromine, nitro group or cyano group;
• and Ar.sup.1, Ar.sup.2 and Ar.sup.3 each is a coupler radical, which may be the same or different, and is selected from the group consisting of coupler radicals of formulas (3) to (10):
• ##STR2035## wherein X.sup.1 is --OH, --N(R.sup.4)(R.sup.5), or --NHSO.sub.2 R.sup.6, in which R.sup.4 and R.sup.5 each is hydrogen, an acyl group or an alkyl group which may have a substituent, and R.sup.6 is an aryl group which may have a substituent;
• Y.sup.1 is hydrogen, a halogen atom, an alkyl group which may have a substituent, an alkoxyl group, a carboxyl group, a sulfone group, a benzimidazolyl group, a sulfamoyl group which may have a substituent, or --CON(R.sup.7)(Y.sup.2), in which R.sup.7 is hydrogen, an alkyl group which may have a substituent, or a phenyl group which may have a substituent, and Y.sup.2 is a cyclic hydrocarbon group which may have a substituent, a heterocyclic group which may have a substituent, or --N.dbd.C(R.sup.8)(R.sup.9), in which R.sup.8 is a cyclic hydrocarbon group which may have a substituent, a heterocyclic group which may have a substituent, or a styryl group which may have a substituent, R.sup.9 is hydrogen, an alkyl group which may have a substituent, or a phenyl group which may have a substituent, and R.sup.8 and R.sup.9 may form a ring in combination with a carbon atom to which R.sup.8 and R.sup.9 are bonded;
• and Z is a cyclic hydrocarbon group which may have a substituent, or a heterocyclic group which may have a substituent;
• ##STR2036## wherein n is an integer of 1 to 4;
• R.sup.10 is hydrogen, an alkyl group which may have a substituent, or an aryl group which may have a substituent;
• R.sup.11 is hydrogen, an alkyl group which may have a substituent, an alkoxyl group which may have a substituent, an alkylsulfonyl group which may have a substituent, an alkylmercapto group which may have a substituent, a halogen atom, an aryl group which may have a substituent, an acyl group which may have a substituent, cyano group, nitro group, or an amino group which may have a substituent, and when n is 2, 3 or 4, R.sup.11 may be the same or different;
• and Y.sup.1 is the same as defined in formula (3);
• ##STR2037## ##STR2038## wherein R.sup.12 in formulas (5) and (6) is a hydrocarbon group which may have a substituent;
• ##STR2039## wherein R.sup.13 in formulas (7) and (8) is an alkyl group, a carbamoyl group, a carboxyl group or an ester group thereof;
• and Ar.sup.4 is an aromatic hydrocarbon group which may have a substituent;
• ##STR2040## wherein X.sup.2 in formulas (9) and (10) is a bivalent aromatic hydrocarbon group or a bivalent heterocyclic group.