Electrophotographic sensitive materials containing a disazo pigment

Claim 2

An electrophotographic material having a high sensitivity as well as a high flexibility, which comprises an electrically conductive support and a photosensitive layer formed thereon, said photosensitive layer consisting essentially of fine particles of disazo pigment selected from the group consisting of disazo pigments having the formulas I, and II, ##STR18## wherein A is selected from the group consisting of ##STR19## is a fused ring selected from the group consisting of benzene ring, halobenzene ring, naphthalene ring, indole ring, carbazol ring and benzofuran ring; Ar 1 is a member selected from the group consisting of phenyl, methylphenyl, methoxyphenyl, chlorophenyl, nitrophenyl, ethoxyphenyl, methylchlorophenyl, dimethylphenyl, methoxychlorophenyl, methoxybromophenyl, methoxymethylphenyl, dimethoxyphenyl, dimethoxychlorophenyl, dimethylaminophenyl, cyanophenyl, carboxyphenyl, benzenesulfonic acid sodium salt, tert-butoxyphenyl, naphthyl, methoxydibenzofuryl and carbazolyl; each of Ar 2 and Ar 3 is a member selected from the group consisting of phenyl, naphthyl, methoxyphenyl, methylphenyl, acetylaminophenyl, dimethylaminophenyl, cyanophenyl, nitrophenyl, dinitrophenyl, chlorophenyl, trichlorobenzenesulfonic acid, benzenesulfonic acid and benzenesulfonamide; each of R 1 and R 3 is a member selected from the group consisting of hydrogen, methyl, ethyl, phenyl and chlorophenyl; and R 2 is a member selected from the group consisting of methyl, carboxyl and --COOC 2 H 5 ; and a resinous binder.

Claim 3

An electrophotographic material according to claim 1 wherein the particle size of said disazo pigment is less than 5 microns, the amount of said disazo pigment is 30-70%, based on the weight of the photosensitive layer, and the thickness of the photosensitive layer is about 3 to 50 microns.

Claim 4

An electrophotographic material according to claim 1 in which A is ##STR20##

Claim 5

An electrophotographic material according to claim 1 in which A is ##STR21##

Claim 6

An electrophotographic material which comprises an electrically conductive support and a photosensitive layer formed thereon, said photosensitive layer consisting essentially of fine particles of disazo pigment selected from the group consisting of disazo pigments having the formulas I and II, ##STR22## wherein A is selected from the group consisting of ##STR23## is a fused ring selected from the group consisting of benzene ring, halobenzene ring, naphthalene ring, indole ring, carbazole ring and benzofuran ring; Ar 1 is a member selected from the group consisting of phenyl, methylphenyl, methoxyphenyl, chlorophenyl, nitrophenyl, ethoxyphenyl, methylchlorophenyl, dimethylphenyl, methoxychlorophenyl, methoxybromophenyl, methoxymethylphenyl, dimethoxyphenyl, dimethoxychlorophenyl, dimethylaminophenyl, cyanophenyl, carboxyphenyl, benzenesulfonic acid sodium salt, tert-butoxyphenyl, naphthyl, methoxydibenzofuryl and carbazolyl; each of Ar 2 and Ar 3 is a member selected from the group consisting of phenyl, naphthyl, methoxyphenyl, methylphenyl, acetylaminophenyl, dimethylaminophenyl, cyanophenyl, nitrophenyl, dinitrophenyl, chlorophenyl, trichlorobenzenesulfonic acid, benzenesulfonic acid and benzenesulfonamide; each of R 1 and R 3 is a member selected from the group consisting of hydrogen, methyl, ethyl, phenyl and chlorophenyl; and R 2 is a member selected from the group consisting of methyl, carboxyl and --COOC 2 H 5 ; a charge-transfer substance and a resinous binder.

Claim 7

An electrophotographic material which comprises an electrically conductive support and a photosensitive layer formed thereon, said photosensitive layer consisting essentially of fine particles of disazo pigment selected from the group consisting of disazo pigments having the formulas I and II, ##STR22## wherein A is selected from the group consisting of ##STR23## is a fused ring selected from the group consisting of benzene ring, halobenzene ring, naphthalene ring, indole ring, carbazole ring and benzofuran ring; Ar 1 is a member selected from the group consisting of phenyl, methylphenyl, methoxyphenyl, chlorophenyl, nitrophenyl, ethoxyphenyl, methylchlorophenyl, dimethylphenyl, methoxychlorophenyl, methoxybromophenyl, methoxymethylphenyl, dimethoxyphenyl, dimethoxychlorophenyl, dimethylaminophenyl, cyanophenyl, carboxyphenyl, benzenesulfonic acid sodium salt, tert-butoxyphenyl, naphthyl, methoxydibenzofuryl and carbazolyl; each of Ar 2 and Ar 3 is a member selected from the group consisting of phenyl, naphthyl, methoxyphenyl, methylphenyl, acetylaminophenyl, dimethylaminophenyl, cyanophenyl, nitrophenyl, dinitrophenyl, chlorophenyl, trichlorobenzenesulfonic acid, benzenesulfonic acid and benzenesulfonamide; each of R 1 and R 3 is a member selected from the group consisting of hydrogen, methyl, ethyl, phenyl and chlorophenyl; and R 2 is a member selected from the group consisting of methyl, carboxyl and --COOC 2 H 5 ; a charge-transfer substance and a resinous binder.

Claim 8

An electrophotographic material according to claim 5 wherein the particle size of said disazo pigment is less than 5 microns, the amount of said disazo pigment is 1-50% and the amount of said charge-transfer substance is 10-95%, based on the weight of the photosensitive layer, and the thickness of the photosensitive layer is about 3 to 50 microns.

Claim 9

An electrophotographic material according to claim 5 in which A is ##STR24##

Claim 10

An electrophotographic material according to claim 5 in which A is ##STR25##

Claim 11

An electrophotographic material which comprises an electrically conductive support and a charge carrier-generating layer formed thereon, said charge carrier-generating layer consisting essentially of fine particles of disazo pigment selected from the group consisting of disazo pigments having the formula I and II, ##STR26## wherein A is selected from the group consisting of ##STR27## is a fused ring selected from the group consisting of benzene ring, halobenzene ring, naphthalene ring, indole ring, carbazole ring and benzofuran ring; Ar 1 is a member selected from the group consisting of phenyl, methylphenyl, methoxyphenyl, chlorophenyl, nitrophenyl, ethoxyphenyl, methylchlorophenyl, dimethylphenyl, methoxychlorophenyl, methoxybromophenyl, methoxymethylphenyl, dimethoxyphenyl, dimethoxychlorophenyl, dimethylaminophenyl, cyanophenyl, carboxyphenyl, benzenesulfonic acid sodium salt, tert-butoxyphenyl, naphthyl, methoxydibenzofuryl and carbazolyl; each of Ar 2 and Ar 3 is a member selected from the group consisting of phenyl, naphthyl, methoxyphenyl, methylphenyl, acetylaminophenyl, dimethylaminophenyl, cyanophenyl, nitrophenyl, dinitrophenyl, chlorophenyl, trichlorobenzenesulfonic acid, benzenesulfonic acid and benzenesulfonamide; each of R 1 and R 3 is a member selected from the group consisting of hydrogen, methyl, ethyl, phenyl and chlorophenyl; and R 2 is a member selected from the group consisting of methyl, carboxyl and --COOC 2 H 5 ; and a charge-transfer layer on said charge-carrier generating layer, charge-transfer layer consisting essentially of a charge-transfer substance and a resinous binder.

Claim 12

An electrophotographic material which comprises an electrically conductive support and a charge carrier-generating layer formed thereon, said charge carrier-generating layer consisting essentially of fine particles of disazo pigment selected from the group consisting of disazo pigments having the formula I and II, ##STR26## wherein A is selected from the group consisting of ##STR27## is a fused ring selected from the group consisting of benzene ring, halobenzene ring, naphthalene ring, indole ring, carbazole ring and benzofuran ring; Ar 1 is a member selected from the group consisting of phenyl, methylphenyl, methoxyphenyl, chlorophenyl, nitrophenyl, ethoxyphenyl, methylchlorophenyl, dimethylphenyl, methoxychlorophenyl, methoxybromophenyl, methoxymethylphenyl, dimethoxyphenyl, dimethoxychlorophenyl, dimethylaminophenyl, cyanophenyl, carboxyphenyl, benzenesulfonic acid sodium salt, tert-butoxyphenyl, naphthyl, methoxydibenzofuryl and carbazolyl; each of Ar 2 and Ar 3 is a member selected from the group consisting of phenyl, naphthyl, methoxyphenyl, methylphenyl, acetylaminophenyl, dimethylaminophenyl, cyanophenyl, nitrophenyl, dinitrophenyl, chlorophenyl, trichlorobenzenesulfonic acid, benzenesulfonic acid and benzenesulfonamide; each of R 1 and R 3 is a member selected from the group consisting of hydrogen, methyl, ethyl, phenyl and chlorophenyl; and R 2 is a member selected from the group consisting of methyl, carboxyl and --COOC 2 H 5 ; and a charge-transfer layer on said charge-carrier generating layer, charge-transfer layer consisting essentially of a charge-transfer substance and a resinous binder.

Claim 13

An electrophotographic material according to claim 9 wherein the particle size of said disazo pigment is less than 5 microns, the amount of said charge-transfer substance is 10-95%, based on the weight of said charge-transfer layer, the thickness of said charge carrier-generating layer is less than 5 microns and the thickness of said charge-transfer layer is about 3 to 50 microns.

Claim 14

An electrophotographic material according to claim 10 in which A is ##STR28##

Claim 15

An electrophotographic material according to claim 10 in which A is ##STR29##

Claim 16

An electrophotographic material which comprises an electrically conductive support, a charge-transfer layer on said support, said charge-transfer layer consisting essentially of a charge-transfer substance and a resinous binder, and a charge carrier-generating layer on said charge-transfer layer, said charge carrier-generating layer consisting essentially of fine particles of disazo pigment selected from the group consisting of disazo pigments having the formulas I and II, ##STR30## wherein A is selected from the group consisting of ##STR31## is a fused ring selected from the group consisting of benzene ring, halobenzene ring, naphthalene ring, indole ring, carbazole ring and benzofuran ring; Ar 1 is a member selected from the group consisting of phenyl, methylphenyl, methoxyphenyl, chlorophenyl, nitrophenyl, ethoxyphenyl, methylchlorophenyl, dimethylphenyl, methoxychlorophenyl, methoxybromophenyl, methoxymethylphenyl, dimethoxyphenyl, dimethoxychlorophenyl, dimethylaminophenyl, cyanophenyl, carboxyphenyl, benzenesulfonic acid sodium salt, tert-butoxyphenyl, naphthyl, methoxydibenzofuryl and carbazolyl; each of Ar 2 and Ar 3 is a member selected from the group consisting of phenyl, naphthyl, methoxyphenyl, methylphenyl, acetylaminophenyl, dimethylaminophenyl, cyanophenyl, nitrophenyl, dinitrophenyl, chlorophenyl, trichlorobenzenesulfonic acid, benzenesulfonic acid and benzenesulfonamide; each of R 1 and R 3 is a member selected from the group consisting of hydrogen, methyl, ethyl, phenyl and chlorophenyl; and R 2 is a member selected from the group consisting of methyl, carboxyl and --COOC 2 H 5 .

Claim 17

An electrophotographic material which comprises an electrically conductive support, a charge-transfer layer on said support, said charge-transfer layer consisting essentially of a charge-transfer substance and a resinous binder, and a charge carrier-generating layer on said charge-transfer layer, said charge carrier-generating layer consisting essentially of fine particles of disazo pigment selected from the group consisting of disazo pigments having the formulas I and II, ##STR30## wherein A is selected from the group consisting of ##STR31## is a fused ring selected from the group consisting of benzene ring, halobenzene ring, naphthalene ring, indole ring, carbazole ring and benzofuran ring; Ar 1 is a member selected from the group consisting of phenyl, methylphenyl, methoxyphenyl, chlorophenyl, nitrophenyl, ethoxyphenyl, methylchlorophenyl, dimethylphenyl, methoxychlorophenyl, methoxybromophenyl, methoxymethylphenyl, dimethoxyphenyl, dimethoxychlorophenyl, dimethylaminophenyl, cyanophenyl, carboxyphenyl, benzenesulfonic acid sodium salt, tert-butoxyphenyl, naphthyl, methoxydibenzofuryl and carbazolyl; each of Ar 2 and Ar 3 is a member selected from the group consisting of phenyl, naphthyl, methoxyphenyl, methylphenyl, acetylaminophenyl, dimethylaminophenyl, cyanophenyl, nitrophenyl, dinitrophenyl, chlorophenyl, trichlorobenzenesulfonic acid, benzenesulfonic acid and benzenesulfonamide; each of R 1 and R 3 is a member selected from the group consisting of hydrogen, methyl, ethyl, phenyl and chlorophenyl; and R 2 is a member selected from the group consisting of methyl, carboxyl and --COOC 2 H 5 .

Claim 18

An electrophotographic material according to claim 13 wherein the particle size of said disazo pigment is less than 5 microns, and the amount of said charge-transfer substance is 10-95% by weight, based on the weight of said charge-transfer layer, the thickness of said charge carrier-generating layer is less than 5 microns and the thickness of said charge-transfer layer is about 3 to 50 microns.

Claim 19

An electrophotographic material according to claim 13 in which A is ##STR32##

Claim 20

An electrophotographic material according to claim 13 in which A is ##STR33##