US3661573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-sensitive compounds
Assignee: Agfa Gevaert NV
•
Filing: 1969-10-09
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Granted: 1972-05-09
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Expires: 1989-10-09
Abstract
Abstract A copying material for use in the photochemical preparation of printing plates comprises a support and a light-sensitive coating formed from an intimate mixture of an alkali-soluble polymer and a compound of the formula: WHEREIN: R hydrogen, alkyl or phenyl; R'' alkyl, phenyl, naphthyl, benzoyl, alkoxybenzoyl, acryloyl, methacryloyl or alkylsulphonylaminoalkyl; R'''' phenyl, alkylphenyl, aminophenyl, dialkylaminophenyl or acylaminophenyl; X hydrogen, halogen, nitro, alkyl or alkoxy; X'' hydrogen, halogen, or alkoxy. On image-wise exposure to actinic light and dissolving the exposed portions of the coating in an aqueous alkaline liquid, a positive printing plate is formed.
Inventors
- 👤 Urbain Leopold Laridon
- 👤 Gerard Albert De S-Gravenwezel
- 👤 Hugo Karel Peeters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:13
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/016; G03F7/0163; G03C; G03C1/00; G03C1/52; G03C1/56
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
29 words
Copying material according to claim 1, wherein at least 4 parts by weight of alkali-soluble polymer are present for each part by weight of compound comprising a diazosulphone group.
Claim 2
Dependent Claim
14 words
Copying material according to claim 2, wherein the alkali-soluble polymer is a novolak resin.
Claim 3
Dependent Claim
15 words
Copying material according to claim 1, wherein the compound comprising a diazosulphone group is (p-acetamidophenylsulphonyl)-(p-diethylamino-phenyl)-diimide.
Claim 4
Dependent Claim
15 words
Copying material according to claim 1, wherein the compound comprising a diazosulphone group is (p-tolyl-sulphonyl)-(p-anilinophenyl)-diimide.
Claim 5
Dependent Claim
15 words
Copying material according to claim 1, wherein the compound comprising a diazosulphone group is (p-tolyl-sulphonyl)-(p-dimethylaminophenyl)-diimide.
Claim 6
Dependent Claim
15 words
Copying material according to claim 1, wherein the compound comprising a diazosulphone group is (p-tolyl-sulphonyl)-(p-diethylaminophenyl)-diimide.
Claim 7
Dependent Claim
15 words
Copying material according to claim 1, wherein the compound comprising a diazosulphone group is (p-tolysul-phonyl)-(4-diethylamino-2-methyl-phenyl)-diimide.
Claim 8
Dependent Claim
50 words
A process for the photochemical preparation of a printing plate, which comprises exposing to actinic light under a master pattern a copying material according to claim 1 and developing the resulting positive image of the master pattern by dissolving the exposed portions of the coating in an aqueous alkaline liquid.
Claim 9
Dependent Claim
24 words
A process as outlined in claim 9 including the step of etching the developed plate in order to produce a positive relief printing plate.
References Cited (Backward Citations)
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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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |