US4349616A
Expired / Lapsed
US
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Disazo pigment containing electrophotographic element
Assignee: Ricoh Co Ltd
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Filing: 1980-12-19
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Granted: 1982-09-14
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Expires: 2000-12-19
Abstract
Abstract An electrophotographic element comprising an electrically conductive substrate and a monolayer or multilayer type photo-sensitive layer, superposed thereon, containing as an effective ingredient a disazo pigment having the general formula (I): ##STR1## wherein Ar 1 and Ar 2 each represent a phenylene group. However, when Ar 1 is 1,4-phenylene group Ar 2 is 1,2- or 1,3-phenylene group; when Ar 1 is 1,3-phenylene group Ar 2 may be any one of 1,2-, 1,3- and 1,4-phenylene groups; and when Ar 1 is 1,2-phenylene group Ar 2 is 1,3-phenylene group. X represents aromatic rings such as benzene ring, naphthalene ring and the like, hetero rings such as indole ring, carbazole ring, benzofuran ring and the like or their substitution products; Ar 3 represents aromatic rings such as benzene ring, naphthalene ring and the like, hetero rings such as dibenzofuran ring and the like or their substitution products; and R represents a hydrogen atom, a lower alkyl group, phenyl group or its substitution product.
Inventors
- 👤 Masaomi Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:13
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0664; G03G5/0675; G03G5/0679; G03G5/0683; C; C09; C09B; C09B56/00; C09B56/04; C09B56/06
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
180 words
An electrophotographic element comprising an electrically conductive substrate; a charge carrier generating layer of a thickness in the range of 0.01 to 5 microns containing 30% or more by weight of at least one disazo pigment having the formula (I): ##STR314## wherein Ar 1 and Ar 2 are phenylene, with the provisos that (1) when Ar 1 is 1,4-phenylene, Ar 2 is 1,2- or 1,3-phenylene, (2) when Ar 1 is 1,3-phenylene, Ar 2 is 1,2-, 1,3- or 1,4-phenylene, and (3) when Ar 1 is 1,2-phenylene, Ar 2 is 1,3-phenylene, X is selected from the group consisting of substituted or unsubstituted aromatic rings, indole, carbazole, or benzofuran, Ar 3 is selected from the group consisting of substituted or unsubstituted aromatic rings, carbazole, or dibenzofuran, and R is hydrogen, lower alkyl, or substituted or unsubstituted phenyl; and a charge transfer layer of a thickness in the range of 3 to 50 microns containing 10 to 95 percent by weight of a charge transfer material and a binder, said charge carrier generating layer and said charge transfer layer being superposed on said substrate.
Claim 2
Dependent Claim
180 words
An electrophotographic element comprising an electrically conductive substrate; a charge carrier generating layer of a thickness in the range of 0.01 to 5 microns containing 30% or more by weight of at least one disazo pigment having the formula (I): ##STR314## wherein Ar 1 and Ar 2 are phenylene, with the provisos that (1) when Ar 1 is 1,4-phenylene, Ar 2 is 1,2- or 1,3-phenylene, (2) when Ar 1 is 1,3-phenylene, Ar 2 is 1,2-, 1,3- or 1,4-phenylene, and (3) when Ar 1 is 1,2-phenylene, Ar 2 is 1,3-phenylene, X is selected from the group consisting of substituted or unsubstituted aromatic rings, indole, carbazole, or benzofuran, Ar 3 is selected from the group consisting of substituted or unsubstituted aromatic rings, carbazole, or dibenzofuran, and R is hydrogen, lower alkyl, or substituted or unsubstituted phenyl; and a charge transfer layer of a thickness in the range of 3 to 50 microns containing 10 to 95 percent by weight of a charge transfer material and a binder, said charge carrier generating layer and said charge transfer layer being superposed on said substrate.
Claim 3
Dependent Claim
34 words
An electrophotographic element as claimed in claim 1 wherein said charge carrier generating layer is interposed between said charge transfer layer and said electrically conductive substrate, said charge transfer layer forming an exposed surface.
Claim 4
Dependent Claim
47 words
An electrophotographic element as claimed in claim 1 wherein the film thickness of said charge carrier generating layer is in the range of from 0.05 to 2 microns and the film thickness of said charge transfer layer is in the range of from 5 to 20 microns.
Claim 5
Dependent Claim
146 words
An electrophotographic element comprising an electrically conductive substrate and a photosensitive layer superposed thereon, said photosensitive layer having a thickness in the range of 3 to 50 microns and containing less than 50% by weight of at least one disazo pigment having the formula (I): ##STR315## wherein Ar 1 and Ar 2 are phenylene, with the provisos that (1) when Ar 1 is 1,4-phenylene, Ar 2 is 1,2- or 1,3-phenylene, (2) when Ar 1 is 1,3-phenylene, Ar 2 is 1,2-, 1,3- or 1,4-phenylene, and (3) when Ar 1 is 1,2-phenylene, Ar 2 is 1,3-phenylene, X is selected from the group consisting of substituted or unsubstituted aromatic rings, indole, carbazole, or benzofuran, Ar 3 is selected from the group consisting of substituted or unsubstituted aromatic rings, carbazole, or dibenzofuran, and R is hydrogen, lower alkyl, or substituted or unsubstituted phenyl, a charge transfer material and a binder.
Claim 6
Dependent Claim
146 words
An electrophotographic element comprising an electrically conductive substrate and a photosensitive layer superposed thereon, said photosensitive layer having a thickness in the range of 3 to 50 microns and containing less than 50% by weight of at least one disazo pigment having the formula (I): ##STR315## wherein Ar 1 and Ar 2 are phenylene, with the provisos that (1) when Ar 1 is 1,4-phenylene, Ar 2 is 1,2- or 1,3-phenylene, (2) when Ar 1 is 1,3-phenylene, Ar 2 is 1,2-, 1,3- or 1,4-phenylene, and (3) when Ar 1 is 1,2-phenylene, Ar 2 is 1,3-phenylene, X is selected from the group consisting of substituted or unsubstituted aromatic rings, indole, carbazole, or benzofuran, Ar 3 is selected from the group consisting of substituted or unsubstituted aromatic rings, carbazole, or dibenzofuran, and R is hydrogen, lower alkyl, or substituted or unsubstituted phenyl, a charge transfer material and a binder.
Claim 7
Dependent Claim
145 words
An electrophotographic element comprising an electrically conductive substrate and a photosensitive layer superposed thereon, said photosensitive layer having a thickness in the range of 3 to 50 microns and containing 30 to 70 percent by weight of at least one kind of disazo pigment having the formula (I): ##STR316## wherein Ar 1 and Ar 2 are phenylene, with the provisos that (1) when Ar 1 is 1,4-phenylene, Ar 2 is 1,2- or 1,3-phenylene, (2) when Ar 1 is 1,3-phenylene, Ar 2 is 1,2-, 1,3- or 1,4-phenylene, and (3) when Ar 1 is 1,2-phenylene, Ar 2 is 1,3-phenylene, X is selected from the group consisting of substituted or unsubstituted aromatic rings, indole, carbazole, or benzofuran, Ar 3 is selected from the group consisting of substituted or unsubstituted aromatic rings, carbazole, or dibenzofuran, and R is hydrogen, lower alkyl, or substituted or unsubstituted phenyl; and a binder.
Claim 8
Dependent Claim
145 words
An electrophotographic element comprising an electrically conductive substrate and a photosensitive layer superposed thereon, said photosensitive layer having a thickness in the range of 3 to 50 microns and containing 30 to 70 percent by weight of at least one kind of disazo pigment having the formula (I): ##STR316## wherein Ar 1 and Ar 2 are phenylene, with the provisos that (1) when Ar 1 is 1,4-phenylene, Ar 2 is 1,2- or 1,3-phenylene, (2) when Ar 1 is 1,3-phenylene, Ar 2 is 1,2-, 1,3- or 1,4-phenylene, and (3) when Ar 1 is 1,2-phenylene, Ar 2 is 1,3-phenylene, X is selected from the group consisting of substituted or unsubstituted aromatic rings, indole, carbazole, or benzofuran, Ar 3 is selected from the group consisting of substituted or unsubstituted aromatic rings, carbazole, or dibenzofuran, and R is hydrogen, lower alkyl, or substituted or unsubstituted phenyl; and a binder.
Claim 9
Dependent Claim
23 words
An electrophotograhic element as claimed in claim 1, claim 4 or claim 5 wherein Ar 1 is 1,4-phenylene and Ar 2 is 1,3-phenylene.
Claim 10
Dependent Claim
23 words
An electrophotographic element as claimed in claim 1, claim 4 or claim 5 wherein Ar 1 is 1,3-phenylene and Ar 2 is 1,4-phenylene.
Claim 11
Dependent Claim
23 words
An electrophotographic element as claimed in claim 1, claim 4 or claim 5 wherein Ar 1 is 1,4-phenylene and Ar 2 is 1,2-phenylene.
Claim 12
Dependent Claim
23 words
An electrophotographic element as claimed in claim 1, claim 4 or claim 5 wherein Ar 1 is 1,3-phenylene and Ar 2 is 1,2-phenylene.
Claim 13
Dependent Claim
23 words
An electrophotographic element as claimed in claim 1, claim 4 or claim 5 wherein Ar 1 is 1,3-phenylene and Ar 2 is 1,3-phenylene.
Claim 14
Dependent Claim
23 words
An electrophotographic element as claimed in claim 1, claim 4 or claim 5 wherein Ar 1 is 1,2-phenylene and Ar 2 is 1,3-phenylene.
Claim 15
Dependent Claim
31 words
An electrophotographic element as claimed in claim 1, claim 4 or claim 5 wherein X is a benzene ring, Ar 3 is a substituted or non-substituted phenyl and R is hydrogen.
Claim 16
Dependent Claim
68 words
An electrophotographic element as claimed in claim 1, claim 4 or claim 5 wherein X is benzene ring, R is hydrogen and Ar 3 is ##STR317## where R 1 is selected from the group consisting of lower alkyl, lower alkoxy, halogen and nitro, n is an integer of from 1 to 3, and when n is 2 or 3, the various R groups are the same or different.
Claim 17
Dependent Claim
23 words
An electrophotographic element as claimed in claim 1, 4 or 5 wherein the disazo pigment is selected from the group consisting of ##STR318##
Claim 18
Dependent Claim
23 words
An electrophotographic element as claimed in claim 1, 4 or 5 wherein the disazo pigment is selected from the group consisting of ##STR319##
Claim 19
Dependent Claim
23 words
An electrophotographic element as claimed in claim 1, 4 or 5 wherein the disazo pigment is selected from the group consisting of ##STR320##
Claim 20
Dependent Claim
23 words
An electrophotographic element as claimed in claim 1, 4 or 5 wherein the disazo pigment is selected from the group consisting of ##STR321##
Claim 21
Dependent Claim
23 words
An electrophotographic element as claimed in claim 1, 4 or 5 wherein the disazo pigment is selected from the group consisting of ##STR322##
Claim 22
Dependent Claim
23 words
An electrophotographic element as claimed in claim 1, 4 or 5 wherein the disazo pigment is selected from the group consisting of ##STR323##
References Cited (Backward Citations)
US4272598A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-09-13 | 1986-03-15 | 1986-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-13 | 1990-03-15 | 1990-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-13 | 1994-03-15 | 1994-09-14 | $7700.00 | Window Closed / Lapsed |