# US 5,344,735 A · Bisazo electrophotographic photoconductor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,344,735 A - Document ID: US5344735A - Status: Granted - Kind: A - Application number: 07/924,581 - Filed: 1992-08-05 - Granted: 1994-09-06 - Earliest claimed: 1988-04-20 - Assignees: Ricoh Company, Ltd. - Inventors: Masaomi Sasaki; Tomoyuki Shimada; Mitsuru Hashimoto - Web page: https://patentgrep.com/patent/US5344735A ## CPC - G03G 5/0685: {containing hetero rings in the part of the molecule between the azo-groups} - G03G 5/0683: {containing polymethine or anthraquinone groups} - G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY ## Abstract An electrophotographic photoconductor is disclosed, which comprises an electroconductive support and a photoconductive layer formed thereon comprising a bisazo pigment having the formula (I) serving as a charge generating material: ##STR1## wherein Ar represents a residual group of a coupler represented by ArH selected from the group consisting of: an aromatic hydrocarbon compound having a hydroxyl group, a heterocyclic compound having a hydroxyl group, an aromatic hydrocarbon compound having an amino group, a heterocyclic compound having an amino group, an aromatic hydrocarbon compound having a hydroxyl group and an amino group, a heterocyclic compound having a hydroxyl group and an amino group, an aliphatic compound having an enolic ketone group, and an aromatic hydrocarbon compound having an enolic ketone group. Further, charge generating materials and novel bisazo pigments for use in the electrophotographic photoconductor are disclosed. ## Claims ### Claim 1 An electrophotographic photoconductor comprising an electroconductive support and a photoconductive layer formed thereon comprising a bisazo pigment having the formula (I) serving as a charge generating material: ##STR225## wherein Ar is a residual group of a coupler represented by ArH selected from the group consisting of: an aromatic hydrocarbon compound having a hydroxyl group, a heterocyclic compound having a hydroxyl group, an aromatic hydrocarbon compound having an amino group, a heterocyclic compound having an amino group, an aromatic hydrocarbon compound having a hydroxyl group and an amino group, a heterocyclic compound having a hydroxyl group and an amino group, an aliphatic compound having an enolic ketone group, and an aromatic hydrocarbon compound having an enolic ketone group; and a charge transporting material. ### Claim 2 (depends on 1) The electrophotographic photoconductor as claimed in claim 1, wherein Ar in the formula (I) is ##STR226## wherein X is ##STR227## wherein R.sup.1 and R.sup.2 each are hydrogen, or an unsubstituted or substituted alkyl group; and R.sup.3 represents an unsubstituted or an substituted alkyl group or an unsubstituted or substituted aryl group; Y.sup.1 is hydrogen, a halogen, an un substituted or substituted alkyl group, an unsubstituted or substituted alkoxyl group, a carboxyl group, a sulfo group, an unsubstituted or substituted sulfamoyl group, or ##STR228## wherein R.sup.4 is hydrogen, an unsubstituted or substituted alkyl group, or an unsubstituted or substituted phenyl group; and Y.sup.2 is an unsubstituted or substituted cyclic hydrocarbon group, an unsubstituted or substituted heterocyclic group, or ##STR229## wherein R.sup.5 is an unsubstituted or substituted cyclic hydrocarbon group, an unsubstituted or substituted heterocyclic group, or an unsubstituted or substituted styryl group; and R.sup.6 is hydrogen, an alkyl group, or an unsubstituted or substituted phenyl group, or R.sup.5 and R.sup.6 may form an unsubstituted or substituted ring in combination with a carbon atom linked thereto; z is an unsubstituted or substituted cyclic hydrocarbon group, or an unsubstituted or substituted heterocyclic group; n is an integer of 1 or 2; and m is an integer of 1 or 2. ### Claim 3 (depends on 1) The electrophotographic photoconductor as claimed in claim 1, wherein Ar in the formula (I) is ##STR230## wherein X is ##STR231## wherein R.sup.1 and R.sup.2 each are hydrogen, or an unsubstituted or substituted alkyl group; and R.sup.3 is an unsubstituted or substituted alkyl group or an unsubstituted or substituted aryl group; Y.sup.1 is hydrogen, a halogen, an unsubstituted or substituted alkyl group, an unsubstituted or substituted alkoxyl group, a carboxyl group, a sulfo group, an unsubstituted or substituted sulfamoyl group, or ##STR232## wherein R.sup.4 is hydrogen, an unsubstituted or substituted alkyl group, or an unsubstituted or substituted phenyl group; and Y.sup.2 is an unsubstituted or substituted cyclic hydrocarbon group, an unsubstituted or substituted heterocyclic group, or ##STR233## wherein R.sup.5 is an unsubstituted or substituted cyclic hydrocarbon group, an unsubstituted or substituted heterocyclic group, or an unsubstituted or substituted styryl group; and R.sup.6 is hydrogen, an alkyl group, or an unsubstituted or substituted phenyl group, or R.sup.5 and R.sup.6 may form an unsubstituted or substituted ring in combination with a carbon atom linked thereto; and Z is an unsubstituted or substituted cyclic hydrocarbon group, or an unsubstituted or substituted heterocyclic group. ### Claim 4 (depends on 1) The electrophotographic photoconductor as claimed in claim 1, wherein Ar in the formula (I) is ##STR234## wherein X is ##STR235## wherein R.sup.1 and R.sup.2 each are hydrogen, or an unsubstituted or substituted alkyl group; and R.sup.3 is an unsubstituted or substituted alkyl group or an unsubstituted or substituted aryl group; Y.sup.1 is hydrogen, a halogen, an unsubstituted or substituted alkyl group, an unsubstituted or substituted alkoxyl group, a carboxyl group, a sulfo group, an unsubstituted or substituted sulfamoyl group, or ##STR236## wherein R.sup.4 is hydrogen, an unsubstituted or substituted alkyl group, or an unsubstituted or substituted phenyl group; and Y.sup.2 is an unsubstituted or substituted cyclic hydrocarbon group, an unsubstituted or substituted heterocyclic group, or ##STR237## wherein R.sup.5 is an unsubstituted or substituted cyclic hydrocarbon group, an unsubstituted or substituted heterocyclic group, or an unsubstituted or substituted styryl group; and R.sup.6 is hydrogen, an alkyl group, or an unsubstituted or substituted phenyl group, or R.sup.5 and R.sup.6 may form an substituted or substituted ring in combination with a carbon atom linked thereto; and Z is an unsubstituted or substituted cyclic hydrocarbon group, or an unsubstituted or substituted heterocyclic group. ### Claim 5 (depends on 1) The electrophotographic photoconductor as claimed in claim 1, wherein Ar in the formula (I) is ##STR238## wherein X is ##STR239## wherein R.sup.1 and R.sup.2 each are hydrogen, or an unsubstituted or substituted alkyl group; and R.sup.3 is an unsubstituted or substituted alkyl group or an unsubstituted or substituted aryl group; and R.sup.7 is an unsubstituted or substituted hydrocarbon group. ### Claim 6 (depends on 1) The electrophotographic photoconductor as claimed in claim 1, wherein Ar in the formula (I) is ##STR240## wherein X is ##STR241## wherein R.sup.1 and R.sup.2 are hydrogen, or an unsubstituted or unsubstituted alkyl group; and R.sup.3 is an unsubstituted or substituted alkyl group or an unsubstituted or substituted aryl group; and R.sup.8 is an alkyl group, a carbamoyl group, a carboxyl group or ester group thereof; and Ar.sup.1 is an unsubstituted or substituted cyclic hydrocarbon group. ### Claim 7 (depends on 1) The electrophotographic photoconductor as claimed in claim 1, wherein Ar in the formula (I) is ##STR242## wherein X is ##STR243## wherein R.sup.1 and R.sup.2 each are hydrogen, or an unsubstituted or substituted alkyl group; and R.sup.3 is an unsubstituted or substituted alkyl group or an unsubstituted or substituted aryl group; and R.sup.9 is hydrogen or an unsubstituted or substituted hydrocarbon group; and Ar.sup.2 is an unsubstituted or substituted cyclic hydrocarbon group. ### Claim 8 (depends on 1) The electrophotographic photoconductor as claimed in claim 1, wherein Ar in the formula (I) is ##STR244## Y.sup.1 is hydrogen, a halogen, an unsubstituted or substituted alkyl group, an unsubstituted or substituted alkoxyl group, a carboxyl group, a sulfo group, an unsubstituted or substituted sulfamoyl group, or ##STR245## wherein R.sup.4 is hydrogen, an unsubstituted or substituted alkyl group, or an unsubstituted or substituted phenyl group; and Y.sup.2 is an unsubstituted or substituted cyclic hydrocarbon group, an unsubstituted or substituted heterocyclic group, or ##STR246## wherein R.sup.5 is an unsubstituted or substituted cyclic hydrocarbon group, an unsubstituted or substituted heterocyclic group, or an unsubstituted or substituted styryl group; and R.sup.6 is hydrogen, an alkyl group, or an unsubstituted or substituted phenyl group, or R.sup.5 and R.sup.6 may form a ring in combination with a carbon atom linked thereto; and Z is an unsubstituted or substituted cyclic hydrocarbon group, or an unsubstituted or substituted heterocyclic group. ### Claim 9 (depends on 1) The electrophotographic photoconductor as claimed in claim 1, wherein Ar in the formula (I) is ##STR247## wherein Z is an unsubstituted or substituted cyclic hydrocarbon group, or an unsubstituted or substituted heterocyclic group; Y.sup.2 is an unsubstituted or substituted cyclic hydrocarbon group, or an unsubstituted or substituted heterocyclic group; and R.sup.2 is hydrogen, an unsubstituted or substituted alkyl group, or unsubstituted or substituted phenyl group. ### Claim 10 (depends on 1) The electrophotographic photoconductor as claimed in claim 1, wherein Ar in the formula (I) is ##STR248## wherein Z is an unsubstituted or substituted cyclic hydrocarbon group, or an unsubstituted or substituted heterocyclic group; R.sup.2 is hydrogen, an unsubstituted or substituted alkyl group, or an unsubstituted or substituted phenyl group; and R.sup.10 is a group selected from the group consisting of an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms, a halogen, a dialkylamino group, a diaralkylamino group, a halomethyl group, a nitro group, a cyano group, a carboxyl group or ester group, a hydroxyl group and a sulfonate group. ### Claim 11 (depends on 1) The electrophotographic photoconductor as claimed in claim 1, wherein Ar in the formula (I) is ##STR249## wherein Z is an unsubstituted or substituted cyclic hydrocarbon group, or an unsubstituted or substituted heterocyclic group; R.sup.5 is an unsubstituted or substituted cyclic hydrocarbon group, an unsubstituted or substituted heterocyclic group, or an unsubstituted or substituted styryl group; and R.sup.6 is hydrogen, an alkyl group, or an unsubstituted or substituted phenyl group, or R.sup.5 and R.sup.6 may form an unsubstituted or substituted ring in combination with a carbon atom linked thereto. ### Claim 12 (depends on 2) The electrophotographic photoconductor as claimed in claim 2, wherein said cyclic hydrocarbon group represented by Z is a ring selected from the group consisting of a benzene ring and a naphthalene ring, which may have a substituent selected from the group consisting of a halogen, an alkyl group, and an alkoxyl group. ### Claim 13 (depends on 2) The electrophotographic photoconductor as claimed in claim 2, wherein said heterocyclic group represented by Z is a ring selected from the group consisting of an indole ring, a carbazole ring and a benzofuran ring, which may have a substituent selected from the group consisting of a halogen, an alkyl group, and an alkoxyl group. ### Claim 14 (depends on 3) The electrophotographic photoconductor as claimed in claim 3, wherein said cyclic hydrocarbon group represented by Z is a ring selected from the group consisting of a benzene ring and a naphthalene ring, which may have a substituent selected from the group consisting of a halogen, an alkyl group, and an alkoxyl group. ### Claim 15 (depends on 3) The electrophotographic photoconductor as claimed in claim 3, wherein said heterocyclic group represented by Z is a ring selected from the group consisting of an indole ring, a carbazole ring and a benzofuran ring, which may have a substituent selected from the group consisting of a halogen, an alkyl group, and an alkoxyl group. ### Claim 16 (depends on 4) The electrophotographic photoconductor as claimed in claim 4, wherein said cyclic hydrocarbon group represented by Z is a ring selected from the group consisting of a benzene ring and a naphthalene ring, which may have a substituent selected from the group consisting of a halogen, an alkyl group, and an alkoxyl group. ### Claim 17 (depends on 4) The electrophotographic photoconductor as claimed in claim 4, wherein said heterocyclic group represented by Z is a ring selected from the group consisting of an indole ring, a carbazole ring and a benzofuran ring, which may have a substituent selected from the group consisting of a halogen, an alkyl group, and an alkoxyl group. ### Claim 18 (depends on 2) The electrophotographic photoconductor as claimed in claim 2, wherein said cyclic hydrocarbon group represented by Y.sup.2 or R.sup.5 is a group selected from the group consisting of a phenyl group, a naphthyl group, an anthryl group, and a pyrenyl group, which may have a substituent selected from the group consisting of an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms, a halogen, a dialkylamino group, a diaralkylamino group, a halomethyl group, a nitro group, a cyano group, a carboxyl group or ester group, a hydroxyl group and a sulfonate group. ### Claim 19 (depends on 2) The electrophotographic photoconductor as claimed in claim 2, wherein said heterocyclic group represented by Y.sup.2 or R.sup.5 is a group selected from the group consisting of a pyridyl group, a thienyl group, a furyl group, anindolyl group, a benzofuranyl group, a carbazolyl group and a dibenzofuranyl group, which may have a substituent selected from the group consisting of an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms, a halogen, a dialkylamino group, a diaralkylamino group, a halomethyl group, a nitro group, a cyano group, a carboxyl group or ester group, a hydroxyl group and a sulfonate group. ### Claim 20 (depends on 3) The electrophotographic photoconductor as claimed in claim 3, wherein said cyclic hydrocarbon group represented by Y.sup.2 or R.sup.5 is a group selected from the group consisting of a phenyl group, a naphthyl group, an anthryl group, and a pyrenyl group, which may have a substituent selected from the group consisting of an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms, a halogen, a dialkylamino group, a diaralkylamino group, a halomethyl group, a nitro group, a cyano group, a carboxyl group or ester group, a hydroxyl group and a sulfonate group. ### Claim 21 (depends on 3) The electrophotographic photoconductor as claimed in claim 3, wherein said heterocyclic group represented by Y.sup.2 or R.sup.5 is a group selected from the group consisting of a pyridyl group, a thienyl group, a furyl group, anindolyl group, a benzofuranyl group, a carbazolyl group and a dibenzofuranyl group, which may have a substituent selected from the group consisting of an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms, a halogen, a dialkylamino group, a diaralkylamino group, a halomethyl group, a nitro group, a cyano group, a carboxyl group or ester group, a hydroxyl group and a sulfonate group. ### Claim 22 (depends on 4) The electrophotographic photoconductor as claimed in claim 4, wherein said cyclic hydrocarbon group represented by Y.sup.2 or R.sup.5 is a group selected from the group consisting of a phenyl group, a naphthyl group, an anthryl group, and a pyrenyl group, which may have a substituent selected from the group consisting of an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms, a halogen, a dialkylamino group, a diaralkylamino group, a halomethyl group, a nitro group, a cyano group, a carboxyl group or ester group, a hydroxyl group and a sulfonate group. ### Claim 23 (depends on 4) The electrophotographic photoconductor as claimed in claim 4, wherein said heterocyclic group represented by Y.sup.2 or R.sup.5 is a group selected from the group consisting of a pyridyl group, a thienyl group, a furyl group, anindolyl group, a benzofuranyl group, a carbazolyl group and a dibenzofuranyl group, which may have a substituent selected from the group consisting of an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms, a halogen, a dialkylamino group, a diaralkylamino group, a halomethyl group, a nitro group, a cyano group, a carboxyl group or ester group, a hydroxyl group and a sulfonate group. ### Claim 24 (depends on 2) The electrophotographic photoconductor as claimed in claim 2, wherein said ring formed by R.sup.5 and R.sup.6 is a fluorene ring which may have a substituent selected from the group consisting of an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms, a halogen, a dialkylamino group, a diaralkylamino group, a halomethyl group, a nitro group, a cyano group, a carboxyl group or ester group, a hydroxyl group and a sulfonate group. ### Claim 25 (depends on 3) The electrophotographic photoconductor as claimed in claim 3, wherein said ring formed by R.sup.5 and R.sup.6 is a fluorene ring which may have a substituent selected from the group consisting of an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms, a halogen, a dialkylamino group, a diaralkylamino group, a halomethyl group, a nitro group, a cyano group, a carboxyl group or ester group, a hydroxyl group and a sulfonate group. ### Claim 26 (depends on 4) The electrophotographic photoconductor as claimed in claim 4, wherein said ring formed by R.sup.5 and R.sup.6 is a fluorene ring which may have a substituent selected from the group consisting of an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms, a halogen, a dialkylamino group, a diaralkylamino group, a halomethyl group, a nitro group, a cyano group, a carboxyl group or ester group, a hydroxyl group and a sulfonate group. ### Claim 27 (depends on 5) The electrophotographic photoconductor as claimed in claim 5, wherein said hydrocarbon group represented by R.sup.7 is selected from the group consisting of an alkyl group having 1 to 4 carbon atoms, an aralkyl group, and an aryl group, which aralkyl group and aryl group may have a substituent selected from the group consisting of an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms, a halogen, a hydroxyl group and a nitro group. ### Claim 28 (depends on 7) The electrophotographic photoconductor as claimed in claim 7, wherein said hydrocarbon group represented by R.sup.9 is selected from the group consisting of an alkyl group having 1 to 4 carbon atoms, an aralkyl group, and an aryl group, which aralkyl group and aryl group may have a substituent selected from the group consisting of an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms, a halogen, a hydroxyl group and a nitro group. ### Claim 29 (depends on 6) The electrophotographic photoconductor as claimed in claim 6, wherein said cyclic hydrocarbon group represented by Ar.sup.1 is selected from the group consisting of a phenyl group and a naphthyl group which may have a substituent selected from the group consisting of an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms, a halogen, a cyano group, and a dialkylamino group. ### Claim 30 (depends on 7) The electrophotographic photoconductor as claimed in claim 7, wherein said cyclic hydrocarbon group represented by Ar.sup.2 is selected from the group consisting of a phenyl group and a naphthyl group which may have a substituent selected from the group consisting of an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms, a halogen, a cyano group, and a dialkylamino group. ### Claim 31 (depends on 8) The electrophotographic photoconductor as claimed in claim 8, wherein said cyclic hydrocarbon group represented by Z is a ring selected from the group consisting of a benzene ring and a naphthalene ring, which may have a substituent selected from the group consisting of a halogen, an alkyl group, and an alkoxyl group. ### Claim 32 (depends on 8) The electrophotographic photoconductor as claimed in claim 8, wherein said heterocyclic group represented by Z is a ring selected from the group consisting of an indole ring, a carbazole ring and a benzofuran ring, which may have a substituent selected from the group consisting of a halogen, an alkyl group, and an alkoxyl group. ### Claim 33 (depends on 8) The electrophotographic photoconductor as claimed in claim 8, wherein said cyclic hydrocarbon group represented by Y.sup.2 or R.sup.5 is a group selected from the group consisting of a phenyl group, a naphthyl group, an anthryl group, and a pyrenyl group, which may have a substituent selected from the group consisting of an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms, a halogen, a dialkylamino group, a diaralkylamino group, a halomethyl group, a nitro group, a cyano group, a carboxyl group or ester group, a hydroxyl group and a sulfonate group. ### Claim 34 (depends on 8) The electrophotographic photoconductor as claimed in claim 8, wherein said heterocyclic group represented by Y.sup.2 or R.sup.5 is a group selected from the group consisting of a pyridyl group, a thienyl group, a furyl group, anindolyl group, a benzofuranyl group, a carbazolyl group and a dibenzofuranyl group, which may have a substituent selected from the group consisting of an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms, a halogen, a dialkylamino group, a diaralkylamino group, a halomethyl group, a nitro group, a cyano group, a carboxyl group or ester group, a hydroxyl group and a sulfonate group. ### Claim 35 (depends on 8) The electrophotographic photoconductor as claimed in claim 8, wherein said ring formed by R.sup.5 and R.sup.6 is a fluorene ring which may have a substituent selected from the group consisting of an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms, a halogen, a dialkylamino group, a diaralkylamino group, a halomethyl group, a nitro group, a cyano group, a carboxyl group or ester group, a hydroxyl group and a sulfonate group. ### Claim 36 (depends on 9) The electrophotographic photoconductor as claimed in claim 9, wherein said cyclic hydrocarbon group represented by Z is a ring selected from the group consisting of a benzene ring and a naphthalene ring, which may have a substituent selected from the group consisting of a halogen, an alkyl group, and an alkoxyl group. ### Claim 37 (depends on 9) The electrophotographic photoconductor as claimed in claim 9, wherein said heterocyclic group represented by Z is a ring selected from the group consisting of an indole ring, a carbazole ring and a benzofuran ring, which may have a substituent selected from the group consisting of a halogen, an alkyl group, and an alkoxyl group. ### Claim 38 (depends on 9) The electrophotographic photoconductor as claimed in claim 9 wherein said cyclic hydrocarbon group represented by Y.sup.2 is a group selected from the group consisting of a phenyl group, a naphthyl group, an anthryl group, and a pyrenyl group, which may have a substituent selected from the group consisting of an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms, a halogen, a dialkylamino group, a diaralkylamino group, a halomethyl group, a nitro group, a cyano group, a carboxyl group or ester group, a hydroxyl group and a sulfonate group. ### Claim 39 (depends on 8) The electrophotographic photoconductor as claimed in claim 8, wherein said heterocyclic group represented by Y.sup.2 is a group selected from the group consisting of a pyridyl group, a thienyl group, a furyl group, anindolyl group, a benzofuranyl group, a carbazolyl group and a dibenzofuranyl group, which may have a substituent selected from the group consisting of an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms, a halogen, a dialkylamino group, a diaralkylamino group, a halomethyl group, a nitro group, a cyano group, a carboxyl group or ester group, a hydroxyl group and a sulfonate group. ### Claim 40 (depends on 10) The electrophotographic photoconductor as claimed in claim 10, wherein said cyclic hydrocarbon group represented by Z is a ring selected from the group consisting of a benzene ring and a naphthalene ring, which may have a substituent selected from the group consisting of a halogen, an alkyl group, and an alkoxyl group. ### Claim 41 (depends on 10) The electrophotographic photoconductor as claimed in claim 10, wherein said heterocyclic group represented by Z is a ring selected from the group consisting of an indole ring, a carbazole ring and a benzofuran ring, which may have a substituent selected from the group consisting of a halogen, an alkyl group, and an alkoxyl group. ### Claim 42 (depends on 11) The electrophotographic photoconductor as claimed in claim 11, wherein said cyclic hydrocarbon group represented by Z is a ring selected from the group consisting of a benzene ring and a naphthalene ring, which may have a substituent selected from the group consisting of a halogen, an alkyl group, and an alkoxyl group. ### Claim 43 (depends on 11) The electrophotographic photoconductor as claimed in claim 11, wherein said heterocyclic group represented by Z is a ring selected from the group consisting of an indole ring, a carbazole ring and a benzofuran ring, which may have a substituent selected from the group consisting of a halogen, an alkyl group, and an alkoxyl group. ### Claim 44 (depends on 11) The electrophotographic photoconductor as claimed in claim 11, wherein said cyclic hydrocarbon group represented by R.sup.5 is a group selected from the group consisting of a phenyl group, a naphthyl group, an anthryl group, and a pyrenyl group, which may have a substituent selected from the group consisting of an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms, a halogen, a dialkylamino group, a diaralkylamino group, a halomethyl group, a nitro group, a cyano group, a carboxyl group or ester group, a hydroxyl group and a sulfonate group. ### Claim 45 (depends on 11) The electrophotographic photoconductor as claimed in claim 11, wherein said heterocyclic group represented by R.sup.5 is a group selected from the group consisting of a pyridyl group, a thienyl group, a furyl group, anindolyl group, a benzofuranyl group, a carbazolyl group and a dibenzofuranyl group, which may have a substituent selected from the group consisting of an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms, a halogen, a dialkylamino group, a diaralkylamino group, a halomethyl group, a nitro group, a cyano group, a carboxyl group or ester group, a hydroxyl group and a sulfonate group. ### Claim 46 (depends on 11) The electrophotographic photoconductor as claimed in claim 11, wherein said ring formed by R.sup.5 and R.sup.6 is a fluorene ring which may have a substituent selected from the group consisting of an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms, a halogen, a dialkylamino group, a diaralkylamino group, a halomethyl group, a nitro group, a cyano group, a carboxyl group or ester group, a hydroxyl group and a sulfonate group. ### Claim 47 (depends on 1) The electrophotographic photoconductor as claimed in claim 1, wherein Ar in the formula (I) is ##STR250## wherein R.sup.1 is hydrogen, an alkyl group, an alkoxyl group, a nitro group, or a halogen; R.sup.2 is an alkyl group, an alkoxyl group, a halogen or a nitro group; and m and n each are an integer of 1 to 3. ### Claim 48 (depends on 1) The electrophotographic photoconductor as claimed in claim 1, wherein Ar in the formula (I) is ##STR251## wherein R.sup.1 is hydrogen, a methyl group, an ethyl group, a methoxy group, an ethoxy group, a halogen or a nitro group; R.sup.2 is a methyl group, an ethyl group, a methoxy group, an ethoxy group, a halogen or a nitro group; and m and n each are an integer of 1 to 3.