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US4451545A
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Electrophotographic element with carbazole derivative
Assignee: Ricoh Co Ltd
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Filing: 1982-09-23
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Granted: 1984-05-29
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Expires: 2002-09-23
Abstract
Abstract An electrophotographic element comprising an electrically conductive substrate and a photosensitive layer, superposed thereon, containing a carbazole derivative compound having the following general formula (I): <IMAGE> (I) (wherein R is a lower alkyl group or a benzyl group; X is a hydrogen atom, a lower alkyl group, a lower alkoxy group, a halogen atom, a nitro group, an amino group or a lower alkyl group- or benzyl group-substituted amino group; and n is an integer such as 1 or 2).
Inventors
- 👤 Mitsuru Hashimoto
- 👤 Kiyoshi Sakai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:07
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0664; G03G5/0666; G03G5/0668; G03G5/067
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
80 words
An electrophotographic element comprising an electrically conductive substrate and a photosensitive layer superposed thereon, wherein said photosensitive layer is a double layer that comprises a charge carrier generating sub-layer consisting essentially of a charge carrier generating material and a charge transfer sub-layer containing a carbazole derivative compound having the following formula (I): ##STR93## wherein R is lower alkyl; X is hydrogen, lower alkyl, lower alkoxy, amino or amino substituted with lower alkyl or benzyl; and n is 1 or 2.
Claim 2
Dependent Claim
80 words
An electrophotographic element comprising an electrically conductive substrate and a photosensitive layer superposed thereon, wherein said photosensitive layer is a double layer that comprises a charge carrier generating sub-layer consisting essentially of a charge carrier generating material and a charge transfer sub-layer containing a carbazole derivative compound having the following formula (I): ##STR93## wherein R is lower alkyl; X is hydrogen, lower alkyl, lower alkoxy, amino or amino substituted with lower alkyl or benzyl; and n is 1 or 2.
Claim 3
Dependent Claim
27 words
An electrophotographic element according to claim 1 wherein the amount of said carbazole derivative compound in the charge transfer sub-layer is in the range of 10-95 wt.%.
Claim 4
Dependent Claim
85 words
An electrophotographic element comprising an electrically conductive substrate and a photosensitive layer superposed thereon, wherein said photosensitive layer is a monolayer formed by dispersing a charge carrier generating material in a charge transfer medium, said charge transfer medium consisting essentially of a mixture of a carbazole derivative compound having the following formula (I) and a binding agent ##STR94## wherein R is lower alkyl; X is hydrogen, lower alkyl, lower alkoxy, amino or amino substituted with lower alkyl or benzyl; and n is 1 or 2.
Claim 5
Dependent Claim
85 words
An electrophotographic element comprising an electrically conductive substrate and a photosensitive layer superposed thereon, wherein said photosensitive layer is a monolayer formed by dispersing a charge carrier generating material in a charge transfer medium, said charge transfer medium consisting essentially of a mixture of a carbazole derivative compound having the following formula (I) and a binding agent ##STR94## wherein R is lower alkyl; X is hydrogen, lower alkyl, lower alkoxy, amino or amino substituted with lower alkyl or benzyl; and n is 1 or 2.
Claim 6
Dependent Claim
80 words
An electrophotographic element comprising an electrically conductive substrate and a photosensitive layer superposed thereon, wherein said photosensitive layer is a monolayer formed by dispersing a charge carrier generating material in a charge transfer medium consisting essentially of a mixture of a carbazole derivative compound having the following of formula (I) and a binding agent ##STR95## wherein X is hydrogen, lower alkyl, lower alkoxy, halogen, nitro, amino or amino substituted with lower alkyl or benzyl; and n is 1 or 2.
Claim 7
Dependent Claim
80 words
An electrophotographic element comprising an electrically conductive substrate and a photosensitive layer superposed thereon, wherein said photosensitive layer is a monolayer formed by dispersing a charge carrier generating material in a charge transfer medium consisting essentially of a mixture of a carbazole derivative compound having the following of formula (I) and a binding agent ##STR95## wherein X is hydrogen, lower alkyl, lower alkoxy, halogen, nitro, amino or amino substituted with lower alkyl or benzyl; and n is 1 or 2.
Claim 8
Dependent Claim
46 words
An electrophotographic element according to claim 4 wherein the amount of said carbazole derivative compound in the photosensitive layer is in the range of 10-95 wt.% and the amount of said charge carrier generating material in the photosensitive layer is in the range of 0.1-50 wt.%.
Claim 9
Dependent Claim
78 words
An electrophotographic element comprising an electrically conductive substrate and a photosensitive layer superposed thereon, wherein said photosensitive layer is a double layer that comprises a charge carrier generating sub-layer consisting essentially of a charge carrier generating material and a charge transfer layer containing a carbazole derivative compound having the following formula (I): ##STR96## wherein X is hydrogen, lower alkyl, lower alkoxy, halogen, nitro, amino or amino substituted with lower alkyl or benzyl; and n is 1 or 2.
Claim 10
Dependent Claim
78 words
An electrophotographic element comprising an electrically conductive substrate and a photosensitive layer superposed thereon, wherein said photosensitive layer is a double layer that comprises a charge carrier generating sub-layer consisting essentially of a charge carrier generating material and a charge transfer layer containing a carbazole derivative compound having the following formula (I): ##STR96## wherein X is hydrogen, lower alkyl, lower alkoxy, halogen, nitro, amino or amino substituted with lower alkyl or benzyl; and n is 1 or 2.
Claim 11
Dependent Claim
27 words
An electrophotographic element according to claim 6 wherein the amount of said carbazole derivative compound in the charge transfer sub-layer is in the range of 10-95 wt.%.
Claim 12
Dependent Claim
146 words
An electrophotographic element as claimed in claim 3 in which R is selected from the group consisting of CH 3 , C 2 H 5 , (CH 2 ) 2 CH 3 , CH(CH 3 ) 2 , (CH 2 ) 3 CH 3 and CH 2 CH(CH 3 ) 2 , and X is selected from the group consisting of hydrogen, CH 3 , C 2 H 5 , (CH 2 ) 2 CH 3 , CH(CH 3 ) 2 , (CH 2 ) 3 CH 3 , CH 2 CH(CH 3 ) 2 , CH(CH 3 )CH 2 CH 3 , C(CH 3 ) 3 , OCH 3 , OC 2 H 5 , O(CH 2 ) 2 CH 3 , O(CH 2 ) 3 CH 3 , NH 2 , N(CH 3 ) 2 , N(C 2 H 5 ) 2 , ##STR97##
Claim 13
Dependent Claim
47 words
An electrophotographic element as claimed in claim 3 in which R is ethyl, n is 1 and X is selected from the group consisting of hydrogen, 4-OC 2 H 5 , 2-CH 3 , 3-CH 3 , 4-NH 2 and 4-N(C 2 H 5 ) 2 .
Claim 14
Dependent Claim
13 words
An electrophotographic element as claimed in claim 3 in which X is hydrogen.
Claim 15
Dependent Claim
146 words
An electrophotographic element as claimed in claim 1 in which R is selected from the group consisting of CH 3 , C 2 H 5 , (CH 2 ) 2 CH 3 , CH(CH 3 ) 2 , (CH 2 ) 3 CH 3 and CH 2 CH(CH 3 ) 2 , and X is selected from the group consisting of hydrogen, CH 3 , C 2 H 5 , (CH 2 ) 2 CH 3 , CH(CH 3 ) 2 , (CH 2 ) 3 CH 3 , CH 2 CH(CH 3 ) 2 , CH(CH 3 )CH 2 CH 3 , C(CH 3 ) 3 , OCH 3 , OC 2 H 5 , O(CH 2 ) 2 CH 3 , O(CH 2 ) 3 CH 3 , NH 2 , N(CH 3 ) 2 , N(C 2 H 5 ) 2 , ##STR98##
Claim 16
Dependent Claim
47 words
An electrophotographic element as claimed in claim 1 in which R is ethyl, n is 1 and X is selected from the group consisting of hydrogen, 4-OC 2 H 5 , 2-CH 3 , 3-CH 3 , 4-NH 2 and 4-N(C 2 H 5 ) 2 .
Claim 17
Dependent Claim
13 words
An electrophotographic element as claimed in claim 1 in which X is hydrogen.
Claim 18
Dependent Claim
101 words
An electrophotographic element as claimed in claim 4 in which X is selected from the group consisting of hydrogen, CH 3 , C 2 H 5 , (CH 2 ) 3 CH 3 , CH(CH 3 ) 2 , CH 2 CH(CH 3 ) 2 , CH(CH 3 )CH 2 CH 3 , C(CH 3 ) 3 , OCH 3 , OC 2 H 5 , O(CH 2 ) 2 CH 3 , O(CH 2 ) 3 CH 3 , Cl, Br, NO 2 , NH 2 , N(CH 3 ) 2 , N(C 2 H 5 ) 2 and ##STR99##
Claim 19
Dependent Claim
17 words
An electrophotographic element as claimed in claim 4 in which n is 1 and X is hydrogen.
Claim 20
Dependent Claim
101 words
An electrophotographic element as claimed in claim 6 in which X is selected from the group consisting of hydrogen, CH 3 , C 2 H 5 , (CH 2 ) 3 CH 3 , CH(CH 3 ) 2 , CH 2 CH(CH 3 ) 2 , CH(CH 3 )CH 2 CH 3 , C(CH 3 ) 3 , OCH 3 , OC 2 H 5 , O(CH 2 ) 2 CH 3 , O(CH 2 ) 3 CH 3 , Cl, Br, NO 2 , NH 2 , N(CH 3 ) 2 , N(C 2 H 5 ) 2 and ##STR100##
Claim 21
Dependent Claim
17 words
An electrophotographic element as claimed in claim 6 in which n is 1 and X is hydrogen.
Claim 22
Dependent Claim
46 words
An electrophotographic element according to claim 3 wherein the amount of said carbazole derivative compound in the photosensitive layer is in the range of 10-95 wt.% and the amount of said charge carrier generating material in the photosensitive layer is in the range of 0.1-50 wt.%.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |