US4365014A
Expired / Lapsed
US
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Electrophotographic photoconductor
Assignee: Ricoh Co Ltd
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Filing: 1979-09-27
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Granted: 1982-12-21
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Expires: 1999-09-27
Abstract
Abstract An electrophotographic photoconductor is prepared by forming a photoconductive layer containing a hydrazone compound therein on an electroconductive support member. The hydrazone compounds represented by the following general formula, are useful as photoconductive materials and as charge transport materials for use in electrophotography: ##STR1## wherein R 1 represents a methyl group, an ethyl group, a 2-hydroxyethyl group, or a 2-chloroethyl group, and R 2 represents a methyl group, an ethyl group, a benzyl group or a phenyl group.
Inventors
- 👤 Kiyoshi Sakai
- 👤 Mitsuru Hashimoto
- 👤 Masafumi Ohta
- 👤 Masaomi Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:03
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0622; G03G5/0624; G03G5/0627; G03G5/0629
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
91 words
An electrophotographic element comprising: an electroconductive support member; a charge carrier producing layer comprising an azo pigment having a styrylstilbene group, as a photoconductive material effective for producing charge carriers; and a charge transport layer adjacent said charge carrier producing layer, which consists essentially of a hydrazone having the formula ##STR32## wherein R 1 is methyl, ethyl,2-hydroxyethyl, or 2-chloroethyl, and R 2 is methyl, ethyl, benzyl or phenyl, and a binder resin selected from the group consisting of polyamide, polyurethane, polyester, epoxy resin, polyketone, polyvinyl ketone, polystyrene, poly-N-vinyl carbazole and polyacrylamide.
Claim 2
Dependent Claim
91 words
An electrophotographic element comprising: an electroconductive support member; a charge carrier producing layer comprising an azo pigment having a styrylstilbene group, as a photoconductive material effective for producing charge carriers; and a charge transport layer adjacent said charge carrier producing layer, which consists essentially of a hydrazone having the formula ##STR32## wherein R 1 is methyl, ethyl,2-hydroxyethyl, or 2-chloroethyl, and R 2 is methyl, ethyl, benzyl or phenyl, and a binder resin selected from the group consisting of polyamide, polyurethane, polyester, epoxy resin, polyketone, polyvinyl ketone, polystyrene, poly-N-vinyl carbazole and polyacrylamide.
Claim 3
Dependent Claim
46 words
An electrophotographic element as claimed in claim 1, wherein said charge transport layer comprises a hydrazone selected from the group consisting of: 9-Methylcarbazole-3-carbaldehyde 1-methyl-1-phenylhydrazone; 9-Methylcarbazole-3-carbaldehyde 1-ethyl-1-phenylhydrazone; 9-Methylcarbazole-3-carbaldehyde 1-benzyl-1-phenylhydrazone; 9-Ethylcarbazole-3-carbaldehyde 1-methyl-1-phenylhydrazone; 9-Ethylcarbazole-3-carbaldehyde 1-ethyl-1-phenylhydrazone; 9-Ethylcarbazole-3-carbaldehyde 1-benzyl-1-phenylhydrazone; 9-(β-Hydroxyethyl)carbazole-3-carbaldehyde 1-methyl-1-phenylhydrazone; 9-(β-Hydroxyethyl)carbazole-3-carbaldehyde 1-ethyl-1-phenylhydrazone; 9-(β-Hydroxyethyl)carbazole-3-carbaldehyde 1-benzyl-1-phenylhydrazone; 9-(β-Chloroethyl)carbazole-3-carbaldehyde 1-methyl-1-phenylhydrazone; 9-(β-Chloroethyl)carbazole-3-carbaldehyde 1-ethyl-1-phenylhydrazone; 9-(β-Chloroethyl)carbazole-3-carbaldehyde 1-benzyl-1-phenylhydrazone.
Claim 4
Dependent Claim
29 words
An electrophotographic element as claimed in claim 1, wherein said charge transport layer comprises a hydrazone selected from the group consisting of 9-Ethylcarbazole-3-carbaldehyde 1-methyl-1-phenylhydrazone, 9-Ethylcarbazole-3-carbaldehyde 1-ethyl-1-phenylhydrazone and 9-Ethylcarbazole-3-carbaldehyde 1-benzyl-1-phenylhydrazone.
Claim 5
Dependent Claim
15 words
An electrophotographic element as claimed in claim 1, wherein said photoconductive material is 1,4-bis[4-{2-hydroxy-3-(2,4-dimethylphenyl)carbamoylnaphthyl-1} azostyryl-1]benzene.
Claim 6
Dependent Claim
53 words
An electrophotographic element as claimed in claim 1, wherein said charge transport layer comprises a hydrazole selected from the group consisting of: 9-Methylcarbazole-3-carbaldehyde 1-methyl-1-phenylhydrazone; 9-Methylcarbazole-3-carbaldehyde 1-ethyl-1-phenylhydrazone; 9-Methylcarbazole-3-carbaldehyde 1-benzyl-1-phenylhydrazone; 9-Ethylcarbazole-3-carbaldehyde 1-methyl-1-phenylhydrazone; 9-Ethylcarbazole-3-carbaldehyde 1-ethyl-1-phenylhydrazone; 9-Ethylcarbazole-3-carbaldehyde 1-benzyl-1-phenylhydrazone; 9-(β-Hydroxyethyl)carbazole-3-carbaldehyde 1-methyl-1-phenylhydrazone; 9-(β-Hydroxyethyl)carbazole-3-carbaldehyde 1-ethyl-1-phenylhydrazone; 9-(β-Hydroxyethyl)carbazole-3-carbaldehyde 1-benzyl-1-phenylhydrazone; 9-(β-Chloroethyl)carbazole-3-carbaldehyde 1-methyl-1-phenylhydrazone; 9-(β-Chloroethyl)carbazole-3-carbaldehyde 1-ethyl-1-phenylhydrazone; 9-(β-Chloroethyl)carbazole-3-carbaldehyde 1-benzyl-1-phenylhydrazone; and said photoconductive material is 1,4-bis[4-{2-hydroxy-3-(2,4-dimethylphenyl)carbamoylnaphthyl-1} azostyryl-1]benzene.
Claim 7
Dependent Claim
36 words
An electrophotographic element as claimed in claim 1, wherein said charge transport layer comprises a hydrazone selected from the group consisting of 9-Ethylcarbazole-3-carbaldehyde 1-methyl-1-phenylhydrazone, 9-Ethylcarbazole-3-carbaldehyde 1-ethyl-1-phenylhydrazone and 9-Ethylcarbazole-3-carbaldehyde 1-benzyl-1-phenylhydrazone, and said photoconductive material is 1,4-bis[4-{2-hydroxy-3-(2,4-dimethylphenyl)carbamoylnaphthyl-1} azostyryl-1]benzene.
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) | 1985-12-20 | 1986-06-21 | 1986-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-20 | 1990-06-21 | 1990-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-20 | 1994-06-21 | 1994-12-21 | $7700.00 | Window Closed / Lapsed |