US4252880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic recording material
Assignee: Hoechst AG
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Filing: 1979-04-20
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Granted: 1981-02-24
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Expires: 1999-04-20
Abstract
Abstract This invention relates to an improvement in an electrophotographic recording material comprising an electrically conductive support, in particular a support adapted for the preparation of printing forms or printed circuits, and a panchromatically sensitized photoconductive layer which comprises an organic photoconductor, a binder, a sensitizing dye, and conventional additives, the improvement that the photoconductive layer contains, as the sensitizing dye, a mixture of a polymethine dye and a triarylmethane dye which absorb, respectively, between about 400 and 550 nm and between about 550 nm and 720 nm.
Inventors
- 👤 Erwin Lind
- 👤 Franz Freimuth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:15
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/09
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
146 words
In an electrophotograhic recording material comprising an electrically conductive support, in particular a support adapted for the preparation of printing forms or printed circuits, and a panchromatically sensitized photoconductive layer which comprises an organic photoconductor, a binder, a sensitizing dye, and conventional additives, the improvement that the photoconductive layer contains, as the sensitizing dye, a mixture of a polymethine dye and a triarylmethane dye which absorb, respectively, between about 400 and 550 nm and between about 550 nm and 720 nm, said polymethine dye being selected from the group consisting of Astrazon Orange R (C.I. 48,040), Astrazon Orange G (C.I. 48,035), Astrazon Yellow 3 GL (C.I. 48,055), Astrazon Yellow 5G (C.I. 48,065), Basic Yellow 52,115 (C.I. 48,060), Aztrazon Yellow GRL (C.I. Basic Yellow 29), Astrazon Yellow 7GLL (C.I. Basic Yellow 21), Astra Yellow R (C.I. Basic Yellow 44), and/or Astrazon Orange 3RL (C.I. Basic Orange 27).
Claim 2
Dependent Claim
146 words
In an electrophotograhic recording material comprising an electrically conductive support, in particular a support adapted for the preparation of printing forms or printed circuits, and a panchromatically sensitized photoconductive layer which comprises an organic photoconductor, a binder, a sensitizing dye, and conventional additives, the improvement that the photoconductive layer contains, as the sensitizing dye, a mixture of a polymethine dye and a triarylmethane dye which absorb, respectively, between about 400 and 550 nm and between about 550 nm and 720 nm, said polymethine dye being selected from the group consisting of Astrazon Orange R (C.I. 48,040), Astrazon Orange G (C.I. 48,035), Astrazon Yellow 3 GL (C.I. 48,055), Astrazon Yellow 5G (C.I. 48,065), Basic Yellow 52,115 (C.I. 48,060), Aztrazon Yellow GRL (C.I. Basic Yellow 29), Astrazon Yellow 7GLL (C.I. Basic Yellow 21), Astra Yellow R (C.I. Basic Yellow 44), and/or Astrazon Orange 3RL (C.I. Basic Orange 27).
Claim 3
Dependent Claim
63 words
A recording material according to claim 1 in which the photoconductive layer contains, as the triarylmethane dye, Malachite Green (C.I. 42,000), Brilliant Green (C.I. 42,040), Acid Violet 6BNOO (C.I. 42,552), Crystal Violet (C.I. 42,555), Fanal Blue RM (C.I. 42,600), Chromoxane Pure Blue BA (C.I. 43,830), Naphthalene Green V (C.I. 44,025), Victoria Pure Blue B (C.I. 42,595), and/or Wool Fast Blue FGL (C.I. 44,505).
Claim 4
Dependent Claim
30 words
A recording material according to claim 1 in which the photoconductive layer contains Astrazon Orange R and Brilliant Green or Crystal Violet or Victoria Pure Blue B as sensitizing dyes.
Claim 5
Dependent Claim
34 words
A recording material according to claim 1 in which the mixture of sensitizing dyes contains between about 25 and 90 percent by weight of a polymethine dye, calculated on the weight of the mixture.
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) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |