US4563410A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the preparation of a planographic printing plate using NiS containing nuclei
Assignee: Agfa Gevaert NV
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Filing: 1984-08-15
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Granted: 1986-01-07
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Expires: 2004-08-15
Abstract
Abstract A method for the preparation of a planographic printing plate wherein a sheet material, which comprises an exterior hydrophilic colloid layer having concentrated on its surface a silver image formed by the silver complex diffusion transfer process with NiS or mixed crystal NiS.Ag 2 S development nuclei in which the molar ratio of NiS to Ag 2 S is not smaller than 1:1, is treated with a liquid for hydrophobizing the silver image for planographic printing, such liquid containing in dissolved state a heterocyclic compound corresponding to one of the following tautomeric structures (A) and (B) or (C) and (D): ##STR1## wherein: R 1 represents hydrogen, amino or acylamino, R 2 represents an alkyl group, and R 3 represents an alkyl group, or an alkanamido-arylene group.
Inventors
- 👤 Antoine A. De Jaeger
- 👤 Alfons J. Bertels
- 👤 Albert L. Poot
- 👤 Rene M. De Keyzer
- 👤 Francis J. Sels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:26
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/06; G03F7/07
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
209 words
A method for the preparation of a planographic printing plate which comprises treating a sheet material having an outer gelatin colloid layer on the surface of which is concentrated a silver image formed by the silver complex diffusion transfer process on development nuclei the major proportion of which is concentrated at the top of said outer layer, wherein said nuclei are NiS or mixed crystal NiS.Ag 2 S nuclei in which the molar ratio of NiS to Ag 2 S is not smaller than 1:1 and the hydrophilic colloid to nuclei weight ratio in said outer colloid layer is at least 1:1 but not higher than 4:1, with an aqueous liquid for hydrophibizing said silver image, wherein said liquid is free of any oxidizing agent, developing agent and silver halide solvent, has a pH in the range of 5 to 6, and contains in dissolved state a heterocyclic compound corresponding to one of the following tautomeric structures (A) and (B) or (C) and (D): ##STR22## wherein: R 1 represents hydrogen, amino or acylamino, R 2 represents an alkyl group having 5-16 carbon atoms, and R 3 represents an alkyl group having 5-16 carbon atoms, or an alkanamido-arylene group, whereby the hydrophobic ink-receptivity of the unoxidized silver image is improved.
Claim 2
Independent Claim
209 words
A method for the preparation of a planographic printing plate which comprises treating a sheet material having an outer gelatin colloid layer on the surface of which is concentrated a silver image formed by the silver complex diffusion transfer process on development nuclei the major proportion of which is concentrated at the top of said outer layer, wherein said nuclei are NiS or mixed crystal NiS.Ag 2 S nuclei in which the molar ratio of NiS to Ag 2 S is not smaller than 1:1 and the hydrophilic colloid to nuclei weight ratio in said outer colloid layer is at least 1:1 but not higher than 4:1, with an aqueous liquid for hydrophibizing said silver image, wherein said liquid is free of any oxidizing agent, developing agent and silver halide solvent, has a pH in the range of 5 to 6, and contains in dissolved state a heterocyclic compound corresponding to one of the following tautomeric structures (A) and (B) or (C) and (D): ##STR22## wherein: R 1 represents hydrogen, amino or acylamino, R 2 represents an alkyl group having 5-16 carbon atoms, and R 3 represents an alkyl group having 5-16 carbon atoms, or an alkanamido-arylene group, whereby the hydrophobic ink-receptivity of the unoxidized silver image is improved.
Claim 3
Dependent Claim
31 words
A method for the preparation of a planograhic printing plate according to claim 1, characterized in that R 2 and R 3 are alkyl groups containing from 5 to 16 C-atoms.
Claim 4
Dependent Claim
51 words
A method for the preparation of a planographic printing plate according to claim 1, characterized in that the hydrophobizing liquid contains at least one organic water-miscible solvent to improve the dissolution of said heterocyclic compound which is present in an amount of at least 0.5 g per liter in dissolved state.
Claim 5
Dependent Claim
22 words
A method for the preparation of a planographic printing plate according to claim 1, characterized in that the heterocyclic compound is 3-n-heptyl-1,2-4-triazole-5-thione.
Claim 6
Dependent Claim
46 words
A method for the preparation of a planographic printing plate according to claim 1, characterized in that said development nuclei are applied to said hydrophilic colloid layer in the presence of hydrophilic protective colloid in a hydrophilic colloid to nuclei weight ratio of 1:1 to 3:1.
Claim 7
Dependent Claim
22 words
A method for the preparation of a planographic printing plate according to claim 1, characterized in that said hydrophilic colloid is gelatin.
Claim 8
Dependent Claim
39 words
A method for the preparation of a planographic printing plate according to claim 1, characterized in that the development of the silver image produced by the silver complex diffusion transfer process proceeds with a developing liquid containing a mercapto-1,3,4-thiadiazole.
Claim 9
Dependent Claim
44 words
A method according to claim 7, characterized in that the mercapto-1,3,4-thiadiazole corresponds to the one of the following structural formulae (I) or (II): ##STR23## wherein n is 1 to 10, and ##STR24## wherein R is an alkyl group with at least 6 carbon atoms.
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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) | 1989-01-06 | 1989-07-08 | 1990-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-06 | 1993-07-08 | 1994-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-06 | 1997-07-08 | 1998-01-07 | $7700.00 | Window Closed / Lapsed |