US4297430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic material for production of printing plates and method for production of printing plates
Assignee: Mitsubishi Paper Mills Ltd
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Filing: 1980-08-01
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Granted: 1981-10-27
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Expires: 2000-08-01
Abstract
Abstract In production of lithographic printing plates by developing a photographic material comprising a support having thereon at least both silver halide emulsion layer and physical development nuclei layer by silver complex diffusion transfer process to form transfer silver to be used as ink-receptive portions of the lithographic printing plates, when the development is carried out in the presence of a cyclic imide compound (alone or in combination with sulfites, thiosulfates, thiocyanates or alkanolamines) as defined hereinafter, ink-receptivity of the transfer silver image portions and printing endurance of thus obtained printing plates are improved. Moreover, the non-image portions have no or substantially no stains.
Inventors
- 👤 Eiji Kanada
- 👤 Shoji Yamada
- 👤 Yasuo Tsubai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:36
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/06; G03F7/063; G03C; G03C8/00; G03C8/02; G03C8/04; G03C8/06
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
119 words
A method for producing a lithographic printing plate which comprises developing a photographic material exposed to light comprising a support having thereon at least both silver halide emulsion layer and surface physical development nuclei layer and having a thickness of 0.5μ or less by silver complex diffusion transfer process and utilizing transfer silver as ink receptive portions of printing plate, characterized in that the development is carried out in the presence of a cyclic imide compound having the general formula: ##STR6## (wherein Z represents atoms of a series of completing a 5- or 6-membered cyclic imide nucleus which comprises from 1 to 3 nitrogen atoms and the remainder being carbon atoms and said atoms of Z may have substituent).
Claim 2
Independent Claim
119 words
A method for producing a lithographic printing plate which comprises developing a photographic material exposed to light comprising a support having thereon at least both silver halide emulsion layer and surface physical development nuclei layer and having a thickness of 0.5μ or less by silver complex diffusion transfer process and utilizing transfer silver as ink receptive portions of printing plate, characterized in that the development is carried out in the presence of a cyclic imide compound having the general formula: ##STR6## (wherein Z represents atoms of a series of completing a 5- or 6-membered cyclic imide nucleus which comprises from 1 to 3 nitrogen atoms and the remainder being carbon atoms and said atoms of Z may have substituent).
Claim 3
Dependent Claim
28 words
A method for producing a lithographic printing plate according to claim 1, wherein the cyclic imide compound is present in at least one layer of the photographic material.
Claim 4
Dependent Claim
25 words
A method for producing a lithographic printing plate according to claim 1, wherein the cyclic imide compound is present in a diffusion transfer developing solution.
Claim 5
Dependent Claim
29 words
A method for producing a lithographic printing plate according to claim 1, wherein the development is carried out in the presence of said cyclic imide compound and a sulfite.
Claim 6
Dependent Claim
36 words
A method for producing a lithographic printing plate according to claim 1, wherein the development is carried out in the presence of said cyclic imide compound and a silver halide solvent selected from thiosulfates and thiocyanates.
Claim 7
Dependent Claim
29 words
A method for producing a lithographic printing plate according to claim 1, wherein the development is carried out in the presence of said cyclic imide compound and an alkanolamine.
Claim 8
Dependent Claim
104 words
Lithographic printing plate which comprises a support having thereon at least both silver halide emulsion layer and surface physical development nuclei layer having a thickness of 0.5μ or less and which is developed by silver complex diffusion transfer process to form transfer silver to be used as ink-receptive portions, characterized in that at least one layer contains a cyclic imide compound having the following general formula: ##STR7## (wherein Z represent atoms of a series completing a 5- or 6-membered cyclic imide nucleus which comprises from 1 to 3 nitrogen atoms and the remainder being carbon atoms and said atoms of Z may have substituent).
Claim 9
Dependent Claim
104 words
Lithographic printing plate which comprises a support having thereon at least both silver halide emulsion layer and surface physical development nuclei layer having a thickness of 0.5μ or less and which is developed by silver complex diffusion transfer process to form transfer silver to be used as ink-receptive portions, characterized in that at least one layer contains a cyclic imide compound having the following general formula: ##STR7## (wherein Z represent atoms of a series completing a 5- or 6-membered cyclic imide nucleus which comprises from 1 to 3 nitrogen atoms and the remainder being carbon atoms and said atoms of Z may have substituent).
Claim 10
Dependent Claim
24 words
A lithographic plate according to claim 7, wherein the silver halide emulsion layer and the physical development nuclei layer are adjacent to each other.
Claim 11
Dependent Claim
21 words
A method for producing a lithographic printing plate according to claim 4, wherein the sulfite is present in the developing solution.
Claim 12
Dependent Claim
23 words
A method for producing a lithographic printing plate according to claim 5, wherein the thiosulfate or thiocyanate is present in the developing solution.
Claim 13
Dependent Claim
21 words
A method for producing a lithographic printing plate according to claim 6, wherein the alkanolamine is present in the developing solution.
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) | 1984-10-26 | 1985-04-27 | 1985-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-26 | 1989-04-27 | 1989-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-26 | 1993-04-27 | 1993-10-27 | $7700.00 | Window Closed / Lapsed |