Disazo compound, method of making same and electrophotographic element using same

Claim 2

A multilayer type electrophotographic element comprising a charge carrier generating layer and a charge transfer layer superimposed on an electrically conductive substrate, wherein said charge carrier generating layer contains a disazo compound having the general formula (1): ##STR353## wherein X is a substituted or unsubstituted aromatic ring or hetero ring and Ar is a substituted or unsubstituted aromatic ring or hetero ring.

Claim 3

An electrophotographic element as claimed in claim 1 wherein the charge transfer generating layer is interposed between the charge transfer layer and the electrically conductive substrate, and the charge transfer layer forms the exposed surface of said element.

Claim 4

An electrophotographic element as claimed in claim 1 wherein the charge carrier generating layer has a thickness of 0.01 to 5 μm and the charge transfer layer has a thickness of 2 to 100 μm.

Claim 5

An electrophotographic element as claimed in claim 3 wherein the charge carrier generating layer has a thickness of 0.05 to 2 μm and the charge transfer layer has a thickness of 5 to 40 μm.

Claim 6

An electrophotographic element as claimed in claim 1 wherein the charge carrier generating layer contains said disazo compound in a quantity of 10 to 100% by weight.

Claim 7

An electrophotographic element as claimed in claim 5 wherein the charge transfer layer contains 10 to 80% by weight of charge transfer substance therein.

Claim 8

An electrophotographic element as claimed in claim 1 wherein X is a substituted or unsubstituted benzene ring, naphthalene ring, indole ring, carbazole ring or benzofuran ring and Ar is a substituted or unsubstituted benzene ring, naphthalene ring, dibenzofuran ring or carbazole ring.

Claim 9

An electrophotographic element as claimed in claim 1 wherein X is an unsubstituted or bromine substituted benzene ring or unsubstituted naphthalene ring, indole ring, carbazole ring or benzofuran ring, and Ar is an unsubstituted benzene ring or a benzene ring substituted with methyl, ethyl, methoxy, ethoxy, tertiary butoxy, fluorine, chlorine, bromine, iodine, trifluoromethyl, cyano, nitro, dimethylamino, carboxyl, --COOC 2 H 5 or --SO 3 Na, unsubstituted naphthalene ring, methoxy substituted dibenzofuran ring or unsubstituted carbazole ring.

Claim 10

An electrophotographic element as claimed in claim 1 wherein X is an unsubstituted benzene ring and Ar is a phenyl, o-methoxyphenyl, m-methoxyphenyl, p-methoxyphenyl, o-ethoxyphenyl, m-ethoxyphenyl, p-ethoxyphenyl, o-methylphenyl, m-methylphenyl, p-methylphenyl, o-ethylphenyl, m-ethylphenyl, p-ethylphenyl, o-chlorophenyl, m-chlorophenyl, p-chlorophenyl, o-bromophenyl, m-bromophenyl, p-bromophenyl, o-iodophenyl, m-iodophenyl, p-iodophenyl, o-fluorophenyl, m-fluorophenyl, p-fluorophenyl, o-trifluoromethylphenyl, m-trifluoromethylphenyl, p-trifluoromethylphenyl, o-cyanophenyl, m-cyanophenyl, p-cyanophenyl, o-nitrophenyl, m-nitrophenyl, p-nitrophenyl, p-carboxyphenyl, ##STR354## p-N,N-dimethylaminophenyl, 2,5-dimethoxyphenyl, 2,5-diethoxyphenyl, 2,5-dimethylphenyl, 2,5-dichlorophenyl, 2-methyl-5-chlorophenyl, 2,4-dimethoxyphenyl, 2,4-dimethylphenyl, 2-methyl-4-chlorophenyl, 2-nitro-4-methoxyphenyl, 3,5-dimethoxyphenyl, 2-methoxy-5-bromophenyl, 2-methyl-4-methoxyphenyl, 2,5-dimethoxy-4-chlorophenyl, 2,4-dimethoxy-5-chlorophenyl, ##STR355## or p-tertiary-butoxyphenyl.

Claim 11

An electrophotographic element as claimed in claim 1 wherein ##STR356##

Claim 12

An electrophotographic element as claimed in claim 1 wherein X is an unsubstituted benzene ring and Ar is an o-methoxyphenyl, m-methoxyphenyl, o-methylphenyl, m-methylphenyl, o-chlorophenyl, m-chlorophenyl, p-chlorophenyl, o-bromophenyl, m-bromophenyl, p-bromophenyl, o-iodophenyl, m-iodophenyl, p-iodophenyl, o-fluorophenyl, m-fluorophenyl, p-fluorophenyl, m-trifluoromethylphenyl, p-trifluoromethylphenyl, o-cyanophenyl, m-cyanophenyl, p-cyanophenyl, o-nitrophenyl, m-nitrophenyl, p-nitrophenyl, 2,5-dichlorophenyl, 2-methyl-5-chlorophenyl, 2-methyl-4-chlorophenyl or 2-nitro-4-methoxyphenyl group.

Claim 13

An electrophotographic element as claimed in claim 1 wherein ##STR357##

Claim 14

An electrophotographic element as claimed in claim 1 wherein X is an unsubstituted benzene ring and Ar is m-chlorophenyl.

Claim 15

An electrophotographic element as claimed in claim 1 wherein X is an unsubstituted benzene ring and Ar is p-chlorophenyl.

Claim 16

An electrophotographic element as claimed in claim 1 wherein X is an unsubstituted benzene ring and Ar is m-bromophenyl.

Claim 17

An electrophotographic element as claimed in claim 1 wherein X is an unsubstituted benzene ring and Ar is p-bromophenyl.

Claim 18

An electrophotographic element as claimed in claim 1 wherein X is an unsubstituted benzene ring and Ar is m-trifluoromethylphenyl.

Claim 19

An electrophotographic element as claimed in claim 1 wherein X is an unsubstituted benzene ring and Ar is p-trifluoromethylphenyl.

Claim 20

An electrophotographic element as claimed in claim 1 wherein X is an unsubstituted benzene ring and Ar is m-cyanophenyl.

Claim 21

An electrophotographic element as claimed in claim 1 wherein X is an unsubstituted benzene ring and Ar is p-cyanophenyl.

Claim 22

An electrophotographic element as claimed in claim 1 wherein X is an unsubstituted benzene ring and Ar is m-nitrophenyl.

Claim 23

An electrophotographic element as claimed in claim 1 wherein X is an unsubstituted benzene ring and Ar is p-nitrophenyl.

Claim 24

An electrophotographic element as claimed in claim 1 wherein X is an unsubstituted benzene ring and Ar is 2,5-dichlorophenyl.

Claim 25

An electrophotographic element as claimed in claim 1 wherein X is an unsubstituted benzene ring and Ar is 2-methyl-5-chlorophenyl.

Claim 26

An electrophotographic element as claimed in claim 1 wherein X is an unsubstituted benzene ring and Ar is 2-methyl-4-chlorophenyl.

Claim 27

An electrophotographic element as claimed in claim 1 wherein ##STR358##

Claim 28

An electrophotographic element as claimed in claim 1 wherein ##STR359##

Claim 29

An electrophotographic element as claimed in claim 1 wherein X is an unsubstituted benzene ring, halogen substituted benzene ring, naphthalene ring, indole ring, carbazole ring or benzofuran ring, and Ar is an unsubstituted benzene ring, benzene ring substituted with alkyl, alkoxy, halogen, trifluoromethyl, cyano, nitro, dialkylamino, carboxyl, --COOC 2 H 5 or --SO 3 Na, naphthalene ring, dibenzofuran ring or carbazole ring.