US4230792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lithographic printing plate from silver halide emulsion
Assignee: Mitsubishi Paper Mills Ltd
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Filing: 1979-01-04
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Granted: 1980-10-28
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Expires: 1999-01-04
Abstract
Abstract The present invention provides a lithographic printing plate, which is made by exposing a photographic material having a silver halide photosensitive emulsion layer, developing the exposed material and treating the developed material with a conversion liquid comprising a solvent for a silver halide and an organic compound capable of forming a compound which is more stable and has a lower solubility than a soluble silver complex formed by said solvent.
Inventors
- 👤 Yasuo Tsubai
- 👤 Akio Yoshida
- 👤 Shigeyoshi Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:24
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/06; G03F7/063; G03F7/066; Y; Y10; Y10S; Y10S430/00; Y10S430/15
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
195 words
In a method for making a lithographic printing plate, which comprises exposing a photosensitive material including a silver halide emulsion layer, and developing the exposed material, the improvement comprising making an undeveloped silver halide portion of said silver halide emulsion layer receptive to oleophilic inks by treating the developed material either (1) simultaneously with at least one solvent for silver halides and at least one organic mercapto or thion compound selected from the group consisting of compounds having the formulae (I), (II) and (III): ##STR3## wherein R is alkyl having at least 10 carbon atoms, aryl or aralkyl group R' is hydrogen, an alkyl having not more than 12 carbon atoms, aryl or aralkyl group, and Z is an atomic group required to form a 5- or 6-membered heterocyclic compound together with N and C in the formulae, or (2) successively, first with said solvent and second with said organic mercapto or thion compound, said organic mercapto or thion compound being capable of forming a compound which is more stable and has a lower solubility than a soluble silver complex formed by said solvent to make an undeveloped silver halide portion receptive to oleophilic inks.
Claim 2
Dependent Claim
195 words
In a method for making a lithographic printing plate, which comprises exposing a photosensitive material including a silver halide emulsion layer, and developing the exposed material, the improvement comprising making an undeveloped silver halide portion of said silver halide emulsion layer receptive to oleophilic inks by treating the developed material either (1) simultaneously with at least one solvent for silver halides and at least one organic mercapto or thion compound selected from the group consisting of compounds having the formulae (I), (II) and (III): ##STR3## wherein R is alkyl having at least 10 carbon atoms, aryl or aralkyl group R' is hydrogen, an alkyl having not more than 12 carbon atoms, aryl or aralkyl group, and Z is an atomic group required to form a 5- or 6-membered heterocyclic compound together with N and C in the formulae, or (2) successively, first with said solvent and second with said organic mercapto or thion compound, said organic mercapto or thion compound being capable of forming a compound which is more stable and has a lower solubility than a soluble silver complex formed by said solvent to make an undeveloped silver halide portion receptive to oleophilic inks.
Claim 3
Dependent Claim
30 words
The method of claim 1 including treating the developed material first with at least one solvent for silver halides and second with at least one organic mercapto or thion compound.
Claim 4
Dependent Claim
49 words
The method according to claim 1, in which the compound of the formula (III) is at least one selected from the group consisting of: ##STR4## wherein R 1 and R 2 are hydrogen, an alkyl, aryl or aralkyl group, and R 3 is hydrogen, an acyl or arylsulfonyl group.
Claim 5
Dependent Claim
16 words
The method according to claim 1, in which the solvents for silver halides are soluble thiocyanates.
Claim 6
Dependent Claim
15 words
The method according to claim 1, in which the solvents for silver halide are thiourea.
Claim 7
Dependent Claim
23 words
The method according to claim 5, in which thiourea is at least one selected from the group consisting of N-monosubstitution and N,N'-disubstitution products.
Claim 8
Dependent Claim
16 words
The method according to claim 1, in which the solvents for silver halides are soluble iodides.
Claim 9
Dependent Claim
27 words
The method according to claim 1, in which the solvents for silver halides are at least one selected from the group consisting of soluble bromides and chlorides.
Claim 10
Dependent Claim
44 words
The method according to claim 1, in which the solvents for silver halides are combinations of at least two compounds selected from the group consisting of soluble thiosulfates, soluble thiocyanates, thiourea, N-monosubstitution and N,N'-disubstitution products of thiourea, soluble iodides, soluble bromides and soluble chlorides.
Claim 11
Dependent Claim
47 words
The method according to claim 9, in which the solvents for silver halides are combinations of at least one of the soluble iodides with at least one selected from the group consisting of soluble thiocyanates, thiourea, N-monosubstitution and N,N'-disubstitution products of thiourea, soluble bromides and soluble thiosulfates.
Claim 12
Dependent Claim
29 words
The method according to claim 1, in which at least one organic heterocyclic compound having no sulfur atom in moieties other than its cyclic moiety is used in combination.
Claim 13
Dependent Claim
32 words
The method according to claim 1, in which a solution of an organic mercapto or thion compound and a solvent for silver halide buffered at a pH value of 4-8 is used.
Claim 14
Dependent Claim
42 words
The method according to claim 1, in which the silver halide photographic material includes an undercoat layer containing fine particles having a particle size of about 2-10 microns on a substrate, on which undercoat layer there is the silver halide emulsion layer.
Claim 15
Dependent Claim
24 words
The method according to claim 1, in which the silver halide emulsion layer contains fine particles having a particle size of about 2-10 microns.
Claim 16
Dependent Claim
14 words
The method according to claim 13, in which the fine particles are silica particles.
Claim 17
Dependent Claim
14 words
The method according to claim 14, in which the fine particles are silica particles.
Claim 18
Dependent Claim
18 words
The method according to claim 1, in which the silver halide emulsion is a direct positive type emulsion.
Claim 19
Dependent Claim
45 words
The method according to claim 1, in which between the development and the treatment with the solvent for silver halide and the organic mercapto or thion compound there is removed a silver halide of undeveloped portions by fixing, and rehalogenated metallic silver of developed portions.
Claim 20
Dependent Claim
29 words
The method according to claim 1, including simultaneously treating the developed material with at least one solvent for silver halides and at least one organic mercapto or thion compound.
Claim 21
Dependent Claim
9 words
A lithographic printing plate made according to 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) | 1983-10-28 | 1984-04-28 | 1984-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-28 | 1988-04-28 | 1988-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-28 | 1992-04-28 | 1992-10-28 | $7700.00 | Window Closed / Lapsed |