Patent US4429029A successfully refreshed from Google Patents.
US4429029A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organic electrophotographic recording medium
Assignee: BASF SE
•
Filing: 1982-03-16
•
Granted: 1984-01-31
•
Expires: 2002-03-16
Abstract
Abstract An electrophotographic recording medium which consists essentially of an electrically conductive base and a photosemiconductive double layer which comprises a first layer containing charge carrier-producing dyes, and a second layer containing one or more compounds which are charge carrier-transporting when exposed to light, wherein the charge carrier-producing dyes are those of the formula I ##STR1## or of the formula II ##STR2## where R 1 is hydrogen, alkyl, aralkyl, alkyl or alkylaryl, and Z may be a a fused aromatic system, and the degree to which the aromatic skeleton is halogen-substituted is from 45 to 75% of the maximum possible, and a process for the production of this electrophotographic recording medium.
Inventors
- 👤 Gerhard Hoffmann
- 👤 Fritz Graser
- 👤 Reinhold J. Leyrer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:29
CPC Classifications
C; C09; C09B; C09B5/00; C09B5/62; G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0622; G03G5/0644; G03G5/0646; G03G5/0657; G03G5/0659
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
107 words
An electrophotographic recording medium which consists essential of (a) an electrically conductive base, (b) a first layer containing a charge carrier-producing dye of the formula (I) or (II) ##STR14## where R 1 is hydrogen, alkyl, aralkyl, aryl or alkylaryl, and Z, where relevant, is a fused aromatic system, and (c) a second layer which is substantially transparent to actinic light and is compsed of insulating organic materials containing at least one compound which is charge carrier-transporting when exposed to light, wherein the chlorine substitution n or m, based on the aromatic skeleton of the formula (I) or (II), is from 45 to 75% of the maximum possible.
Claim 2
Dependent Claim
107 words
An electrophotographic recording medium which consists essential of (a) an electrically conductive base, (b) a first layer containing a charge carrier-producing dye of the formula (I) or (II) ##STR14## where R 1 is hydrogen, alkyl, aralkyl, aryl or alkylaryl, and Z, where relevant, is a fused aromatic system, and (c) a second layer which is substantially transparent to actinic light and is compsed of insulating organic materials containing at least one compound which is charge carrier-transporting when exposed to light, wherein the chlorine substitution n or m, based on the aromatic skeleton of the formula (I) or (II), is from 45 to 75% of the maximum possible.
Claim 3
Dependent Claim
39 words
The electrophotographic recording medium of claim 1, wherein the charge carrier-producing dye of the formula (I) is a chlorinated perylene-3,4,9,10-tetracarboxylic acid N,N'-dimethyldiimide with a degree of chlorination of the aromatic skeleton of about 66% of the maximum possible chlorination.
Claim 4
Dependent Claim
39 words
The electrophotographic recording medium of claim 1, wherein the charge carrier-producing dye of the formula (II) is a chlorinated perylene-3,4,9,10-tetracarboxylic acid bis-benzimidazole with a degree of chlorination of the aromatic skeleton of about 56% of the maximum possible chlorination.
Claim 5
Dependent Claim
31 words
The electrophotographic recording medium of claim 1, wherein in the second layer, which is substantially transparent to actinic light, the compound which is charge carrier-transporting when exposed to light is poly-(N-vinylcarbazole).
Claim 6
Dependent Claim
104 words
A process for the production of an electrophotographic recording medium as defined in claim 1, wherein there is applied to an electrically conductive base a dispersion containing a charge carrier-producing dye, with or without an insulating organic binder, to give a 0.005-5 μm thick dry layer, following which a solution of an insulating organic material which is charge carrier-transporting when exposed to light, with or without other insulating organic materials which are completely compatible with one another in solution and in the dry film, is applied to the dry layer thus obtained, to form a second layer which is 2-40 μm thick when dry.
References Cited (Backward Citations)
US1715430A
Cited
CH373844A
Cited
US3904407A
Cited
DE2139690A1
Cited
DE2237539C3
Cited
DE2314051C3
Cited
US4156757A
Cited
DE2929518C2
Cited
DE3001936A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-30 | 1987-08-01 | 1988-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-30 | 1991-08-01 | 1992-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-30 | 1995-08-01 | 1996-01-31 | $7700.00 | Window Closed / Lapsed |