US4063948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Material for electrophotographic reproduction
Assignee: Hoechst AG
•
Filing: 1976-06-10
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Granted: 1977-12-20
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Expires: 1996-06-10
Abstract
Abstract This invention relates to a material for electrophotographic reproduction, which comprises a conductive support having a sensitized photoconductive insulating layer thereon containing at least one photoconductor and containing, as a sensitizer, a polymethine dyestuff capable of absorbing radiation of a wavelength within the spectral range of 400 to 550 nm.
Inventors
- 👤 Erwin Lind
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:33
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0664; G03G5/0666; G03G5/0668; G03G5/067; H; H05; H05K; H05K3/00; H05K3/02; H05K3/06; H05K3/061; H05K3/065
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
95 words
A material for electrophotographic reproduction, which comprises a conductive support having a sensitized photoconductive insulating layer thereon containing at least one organic photoconductor and containing, as a sensitizer, a polymethine dyestuff capable of effecting sensitization in the short wavelength absorption range of the photoconductor within the spectral range of 400 to 550 nm, the sensitizer having the general formula ##STR4## wherein A is an unsubstituted or substituted indolyl group, an unsubstituted or substituted benzthiazolylamino group, an unsubstituted or substituted phenylamino group, or an unsubstituted or substituted indolinyl group, and X - is a monovalent anion.
Claim 2
Dependent Claim
95 words
A material for electrophotographic reproduction, which comprises a conductive support having a sensitized photoconductive insulating layer thereon containing at least one organic photoconductor and containing, as a sensitizer, a polymethine dyestuff capable of effecting sensitization in the short wavelength absorption range of the photoconductor within the spectral range of 400 to 550 nm, the sensitizer having the general formula ##STR4## wherein A is an unsubstituted or substituted indolyl group, an unsubstituted or substituted benzthiazolylamino group, an unsubstituted or substituted phenylamino group, or an unsubstituted or substituted indolinyl group, and X - is a monovalent anion.
Claim 3
Dependent Claim
28 words
A material as claimed in claim 1 wherein the sensitizer dyestuff is capable of absorbing radiation of a wavelength within the spectral range of 480 to 520 nm.
Claim 4
Dependent Claim
14 words
A material as claimed in claim 1 wherein X - is a halide ion.
Claim 5
Dependent Claim
14 words
A material as claimed in claim 1 wherein X - is a chloride ion.
Claim 6
Dependent Claim
17 words
A material as claimed in claim 1 wherein the sensitizer is C.I. Basic Orange 21 (C.I. 48035).
Claim 7
Dependent Claim
17 words
A material as claimed in claim 1 wherein the sensitizer is C.I. Basic Orange 22 (C.I. 48040).
Claim 8
Dependent Claim
29 words
A material as claimed in claim 1 wherein the sensitizer is C.I. Basic Yellow II (C.I. 48055), Basic Yellow 52115 (C.I. 48060), or C.I. Basic Yellow 12 (C.I. 48065).
Claim 9
Dependent Claim
41 words
A material as claimed in claim 1 wherein the sensitizer is Aztrazone Orange 3R (C.I. Basic Orange 27), Astrazone Yellow 7GLL (C.I. Basic Yellow 21), Astrazone Yellow GRL (C.I. Basic Yellow 2a ) or Astra Yellow R (C.I. Basic Yellow 44).
Claim 10
Dependent Claim
29 words
A material as claimed in claim 1 wherein the photoconductive insulating layer contains 0.01 to 10 percent by weight of sensitizer, calculated on the total weight of the photoconductor.
Claim 11
Dependent Claim
28 words
A material as claimed in claim 9 wherein the photoconductive insulating layer contains about 5 percent by weight of sensitizer, calculated on the total weight of the photoconductor.
Claim 12
Dependent Claim
22 words
A material as claimed in claim 1 wherein the photoconductive insulating layer includes as a photoconductor an oxazole, triazole or oxadiazole derivative.
Claim 13
Dependent Claim
15 words
A material as claimed in claim 11 wherein the photoconductor is a substituted vinyl oxazole.
Claim 14
Dependent Claim
12 words
A material as claimed in claim 12 wherein the photoconductor is 2-vinyl-4-(2'-chlorophenyl)-5-(4"-diethylaminophenyl)-oxazole.
Claim 15
Dependent Claim
12 words
A material as claimed in claim 11 wherein the photoconductor is 2,5-bis-(4'-diethylaminophenyl)-1,3,4-oxadiazole.
Claim 16
Dependent Claim
29 words
A material as claimed in claim 1 wherein the conductive support comprises aluminum foil of which the surface adjacent the photoconductive insulating layer has been mechanically or electrochemically roughened.
Claim 17
Dependent Claim
26 words
A material as claimed in claim 15 wherein the surface of the aluminum foil has been electrochemically roughened, optionally anodized, and treated with polyvinyl phosphonic acid.
Claim 18
Dependent Claim
21 words
A material as claimed in claim 1 wherein the photoconductive insulating layer includes as a binder a natural or synthetic resin.
Claim 19
Dependent Claim
17 words
A material as claimed in claim 17 wherein the binder comprises a polymeric material containing alkali-solubilizing groups.
Claim 20
Dependent Claim
18 words
A material as claimed in claim 18 wherein the binder comprises a polymeric material containing acid anhydride groups.
Claim 21
Dependent Claim
18 words
A material as claimed in claim 19 wherein the binder comprises a copolymer of styrene and maleic anhydride.
Claim 22
Dependent Claim
28 words
A process for the production of a printing form or a printed circuit, which includes uniform charging imagewise exposing and developing a material as claimed in claim 1.
Claim 23
Dependent Claim
15 words
A printing form or a printed circuit produced by the process claimed in claim 1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-19 | 1981-06-20 | 1981-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-19 | 1985-06-20 | 1985-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-19 | 1989-06-20 | 1989-12-20 | $7700.00 | Window Closed / Lapsed |