US4221858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing a planographic printing plate
Assignee: Fujifilm Holdings Corp
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Filing: 1978-07-27
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Granted: 1980-09-09
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Expires: 1998-07-27
Abstract
Abstract In a process for preparing a planographic printing plate which comprises imagewise exposing a silver halide photosensitive material comprising a support having thereon a tanning-developable silver halide photosensitive layer; tanning developing the exposed photosensitive material and washing out the untanned areas of the photosensitive layer; the improvement comprising the silver halide photosensitive layer further contains finely divided particles of an oleophilic synthetic resin in which the particles are substantially insoluble in water, are non-permeable to an alkaline solution and are not dissolved during the tanning development.
Inventors
- 👤 Keisuke Shiba
- 👤 Kesanao Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:04
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/06; Y; Y10; Y10S; Y10S430/00; Y10S430/15
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
138 words
In a process for preparing a planographic printing plate which comprises imagewise exposing a silver halide photosensitive material comprising a support having a hydrophilic surface having thereon a tanning-developable silver halide photosensitive layer; tanning developing the exposed photosensitive material and wasing out the untanned areas of the photosensitive layer to reveal the hydrophilic surface thereby to obtain the planographic printing plate; the improvement comprising the silver halide photosensitive layer further contains finely divided particles of an oleophilic synthetic resin in which the particles are substantially insoluble in water, are non-permeable to an alkaline solution and are not dissolved during the tanning development, and said oleophilic synthetic resin exhibits a positive difference in contact angle θ where θ=]θo/w-θw/o] in which θo/w is the contact angle of kerosine in water, and θw/o is the contact angle of water in kerosine.
Claim 2
Dependent Claim
138 words
In a process for preparing a planographic printing plate which comprises imagewise exposing a silver halide photosensitive material comprising a support having a hydrophilic surface having thereon a tanning-developable silver halide photosensitive layer; tanning developing the exposed photosensitive material and wasing out the untanned areas of the photosensitive layer to reveal the hydrophilic surface thereby to obtain the planographic printing plate; the improvement comprising the silver halide photosensitive layer further contains finely divided particles of an oleophilic synthetic resin in which the particles are substantially insoluble in water, are non-permeable to an alkaline solution and are not dissolved during the tanning development, and said oleophilic synthetic resin exhibits a positive difference in contact angle θ where θ=]θo/w-θw/o] in which θo/w is the contact angle of kerosine in water, and θw/o is the contact angle of water in kerosine.
Claim 3
Dependent Claim
24 words
The process of claim 1, wherein said oleophilic synthetic resin has a solubility of less than about 25 wt.% in water at 25° C.
Claim 4
Dependent Claim
23 words
The process of claim 1, wherein said oleophilic synthetic resin has a solubility of less than 0.1 wt.% in water at 25° C.
Claim 5
Dependent Claim
36 words
The process of claim 1, wherein said oleophilic synthetic resin is at least one selected from the group consisting of polyesters, polyamides, phenol-aldehyde resins, polyvinyl acetate, polyvinyl chloride, polyurethanes, polyacrylates, epoxy resins, silicone resins and polyamines.
Claim 6
Dependent Claim
25 words
The process of claim 4, wherein said oleophilic synthetic resin is selected from the group consisting of polyvinyl acetate, polyvinyl chloride, polyurethanes, polyesters and polyacrylates.
Claim 7
Dependent Claim
31 words
The process of claim 1, wherein said oleophilic synthetic resin has a molecular weight more than about 500 and is selected from the group consisting of photo-cross-linkable polymers and photopolymerizable oligomers.
Claim 8
Dependent Claim
17 words
The process of claim 1, wherein said silver halide photosensitive emulsion is a gelatino silver halide emulsion.
Claim 9
Dependent Claim
41 words
The process of claim 7, wherein said finely divided particles of the oleophilic synthetic resin are present in an amount of about 10% to about 150% by weight based on the weight of the gelatin in said gelatino silver halide emulsion.
Claim 10
Dependent Claim
39 words
The process of claim 7, wherein said finely divided particles of the oleophilic synthetic resin are present in an amount of 30% to 125% by weight based on the weight of the gelatin in said gelatino silver halide emulsion.
Claim 11
Dependent Claim
20 words
The process of claim 8, wherein said finely divided particles have a particle size of about 0.01μ to about 100μ.
Claim 12
Dependent Claim
20 words
The process of claim 8, wherein said finely divided particles have a particle size of about 0.01μ to about 10μ.
Claim 13
Dependent Claim
18 words
The process of claim 8, wherein said finely divided particles have a particle size of 0.01μ to 1μ.
Claim 14
Dependent Claim
18 words
The process of claim 1, wherein said silver halide photosensitive emulsion layer further contains a tanning developing agent.
Claim 15
Dependent Claim
36 words
The process of claim 13, wherein said tanning developing agent is present in said photosensitive layer in an amount of about 0.5 mol to about 2.5 mol per mol of silver halide in said photosensitive layer.
Claim 16
Dependent Claim
34 words
The process of claim 13, wherein said tanning developing agent is present in said photosensitive layer in an amount of 0.5 mol to 1.5 mol per mol of silver halide in said photosensitive layer.
Claim 17
Dependent Claim
27 words
The process of claim 14, wherein said tanning developing agent is selected from the group consisting of hydroquinone, toluhydroquinone, chlorohydroquinone, pyrogallol, resorcinol, hexylresorcinol, phloroglucinol, 4-benzylcatechol and 4-phenylcatechol.
Claim 18
Dependent Claim
12 words
The process of claim 1, wherein said support is an aluminum sheet.
Claim 19
Dependent Claim
19 words
The process of claim 17, wherein said aluminum sheet has thereon an aluminum oxide layer produced by anodic oxidation.
Claim 20
Dependent Claim
12 words
The process of claim 13, wherein said support is an aluminum sheet.
Claim 21
Dependent Claim
19 words
The process of claim 19, wherein said aluminum sheet has thereon an aluminum oxide layer produced by anodic oxidation.
References Cited (Backward Citations)
GB1139891A
Cited
BE681138A
Cited
US3615443A
Cited
US3642475A
Cited
US3642480A
Cited
US3632342A
Cited
US3852066A
Cited
US3852067A
Cited
JPS522520A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-09 | 1984-03-10 | 1984-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-09 | 1988-03-10 | 1988-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-09 | 1992-03-10 | 1992-09-09 | $7700.00 | Window Closed / Lapsed |