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US4537844A
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Electrophotographic element containing disazo compound
Assignee: Ricoh Co Ltd
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Filing: 1983-09-28
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Granted: 1985-08-27
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Expires: 2003-09-28
Abstract
Abstract A novel disazo compound is provided which is represented by the general formula (I): ##STR1## (wherein, R 1 and R 2 each stands for hydrogen, a lower alkyl group with 1-4 carbon atoms, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aromatic group, or a substituted or unsubstituted hetero ring group. R 1 and R 2 may be the same or different. And, R 1 and R 2 may mutually bond to form a ring). This disazo compound may be obtained by diazotating 2,6-diaminoanthraquinone and reacting the same with a coupler represented by the general formula (IV): ##STR2## (wherein, R 1 and R 2 are the same as defined above). Further, a multilayer type electrophotographic element is provided which comprises a charge carrier generating layer and a charge transfer layer and uses, as a charge carrier generating substance, a disazo compound represented by the general formula (I).
Inventors
- 👤 Mitsuru Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:13
CPC Classifications
C; C09; C09B; C09B35/00; C09B35/02; C09B35/021; G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0664; G03G5/0675; G03G5/0679; G03G5/0683
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
85 words
An electrophotographic element comprising a charge carrier generating layer and a charge transfer layer formed on an electrically conductive substrate, wherein said charge carrier generating layer contains therein a disazo compound represented by the general formula (I): ##STR121## wherein, R 1 and R 2 are the same or different and each stands for hydrogen, C 1 -C 4 lower alkyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aromatic group, or a substituted or unsubstituted hetero group, or ##STR122## forms a ring.
Claim 2
Dependent Claim
85 words
An electrophotographic element comprising a charge carrier generating layer and a charge transfer layer formed on an electrically conductive substrate, wherein said charge carrier generating layer contains therein a disazo compound represented by the general formula (I): ##STR121## wherein, R 1 and R 2 are the same or different and each stands for hydrogen, C 1 -C 4 lower alkyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aromatic group, or a substituted or unsubstituted hetero group, or ##STR122## forms a ring.
Claim 3
Dependent Claim
33 words
An electrophotographic element according to claim 1 wherein said charge carrier generating layer is formed on said electrically conductive substrate and said charge transfer layer is formed on the charge carrier generating layer.
Claim 4
Dependent Claim
26 words
An electrophotographic element according to claim 1 wherein the charge carrier generating layer is 0.01-5 μm thick and the charge transfer layer is 2-100 μm thick.
Claim 5
Dependent Claim
26 words
An electrophotographic element according to claim 3 wherein the charge carrier generating layer is 0.05-2 μm thick and the charge transfer layer is 5-40 μm thick.
Claim 6
Dependent Claim
20 words
An electrophotographic element according to claim 1 wherein the charge carrier generating layer contains 10-100 wt.% of said disazo compound.
Claim 7
Dependent Claim
20 words
An electrophotographic element according to claim 1 wherein the charge transfer layer contains 10-80 wt.% of a charge transfer substance.
Claim 8
Dependent Claim
65 words
An electrophotographic element according to claim 1, wherein R 1 and R 2 each stands for hydrogen, a methyl group, an ethyl group, a propyl group, a substituted or unsubstituted benzyl group, phenetyl group, phenyl group, naphthyl group, anthryl group, pyrenyl group, anthraquinonyl group, thienyl group, furyl group, pyridyl group or carbazolyl group, and R 1 and R 2 may be the same or different.
Claim 9
Dependent Claim
44 words
An electrophotographic element according to claim 7 wherein the substituent on said substituted benzyl group is C 1 -C 4 lower alkyl group, C 1 -C 4 lower alkoxy group, halogen, a cyano group, nitro group or C 2 -C 8 lower dialkylamino group.
Claim 10
Dependent Claim
27 words
An electrophotographic element according to claim 1 wherein R 1 and R 2 mutually bond to form a substituted or unsubstituted hexylidene, pentylidene, benzopentylidene or dibenzopentylidene ring.
Claim 11
Dependent Claim
40 words
An electrophotographic element according to claim 9 wherein the substituent is C 1 -C 4 lower alkyl group, C 1 -C 4 lower alkoxy group, halogen, a cyano group, a nitro group or C 2 -C 8 lower dialkylamino group.
Claim 12
Dependent Claim
26 words
An electrophotographic element according to claim 1 wherein R 1 stands for hydrogen and R 2 stands for a substituted or unsubstituted aromatic or hetero ring.
Claim 13
Dependent Claim
46 words
An electrophotographic element according to claim 1 wherein R 1 stands for hydrogen and R 2 stands for a benzene ring, a naphthalene ring, an anthracene ring, a pyran ring, an anthraquinone ring, a thiophene ring, a furan ring, a pyridine ring or a carbazole ring.
Claim 14
Dependent Claim
40 words
An electrophotographic element according to claim 11 wherein the substituent is C 1 -C 4 lower alkyl group, C 1 -C 4 lower alkoxy group, halogen, a cyano group, a nitro group or C 2 -C 8 lower dialkylamino group.
Claim 15
Dependent Claim
74 words
An electriophotographic element according to claim 1 wherein R 1 stands for hydrogen, and R 2 stands for a phenyl group, o-, m- or p-methylphenyl group, o-, m- or p-methoxyphenyl group, o-, m- or p-fluorophenyl group, o-, m- or p-chlorophenyl group, o-, m- or p-bromophenyl group, o- or p-cyanophenyl group, o-, m- or p-nitrophenyl group, p-ethoxyphenyl group, p-N,N-dimethylaminophenyl group, 2,4-dimethylphenyl group, 2,5-dimethoxyphenyl group, 2,3,4-trimethoxyphenyl group, 2,4-dichlorophenyl group, 3,4-dichlorophenyl group, ##STR123## or an ethyl group.
Claim 16
Dependent Claim
19 words
An electrophotographic element according to claim 1 wherein R 1 stands for hydrogen and R 2 stands for ##STR124##
Claim 17
Dependent Claim
47 words
An electrophotographic element according to claim 1 wherein R 1 stands for a methyl group and R 2 stands for a phenyl group, or a p-chlorophenyl group, or R 1 stands for a phenyl group and R 2 stands for a phenyl group or a benzyl group.
Claim 18
Dependent Claim
9 words
An electrophotographic element according to claim 1 wherein ##STR125##
Claim 19
Dependent Claim
41 words
An electrophotographic element according to claim 1 wherein R 1 stands for hydrogen, and R 2 stands for a phenyl group, o-, m- or p-methylphenyl group, o- or m-methoxyphenyl group, o-, m- or p-chlorophenyl group or o-, m- or p-nitrophenyl group.
References Cited (Backward Citations)
US4440845A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-26 | 1989-02-25 | 1989-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-26 | 1993-02-25 | 1993-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-26 | 1997-02-25 | 1997-08-27 | $7700.00 | Window Closed / Lapsed |