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US4584261A
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Process for etching nonphotosensitive layer under washoff photopolymer layer
Assignee: EIDP Inc
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Filing: 1984-07-27
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Granted: 1986-04-22
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Expires: 2004-07-27
Abstract
Abstract Process for preparation of dot-etched, photopolymerizable lithographic film which comprises (a) exposing imagewise a photopolymerizable element consisting essentially of a support and two caustic or water soluble layers, the upper layer being clear, unpigmented photopolymer and the lower layer being a polymeric binder having dispersed therein a chemically soluble pigment, e.g., colloidal silver or other metal; and optionally an overcoat layer; developing the exposed element with caustic solution and then water; and treating the developed image with a solubilizing agent, e.g., K 2 Fe(CN) 6 , FeCl 3 ,Na 2 S 2 O 3 , KCNS, KOH, NH 3 , etc. A dot-etched lithographic film is prepared.
Inventors
- 👤 Robert P. Held
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:20
CPC Classifications
G; G03; G03F; G03F1/00; G03F1/54; G03F1/56; G03F7/00; G03F7/26; G03F7/40; G03F7/405
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
115 words
A process for the preparation of a dot-etched photopolymerizable lithographic film which comprises (a) exposing imagewise to actinic radiation a photopolymerizable element consisting essentially of a support bearing, in order, (1) a nonphotosensitive layer of a caustic or water soluble polymeric binder having dispersed therein a chemically soluble pigment, and (2) a layer of clear, unpigmented caustic or was soluble photopolymerizable composition comprising a caustic soluble binder; (b) developing the exposed element with a caustic solution and then with water; (c) treating the developed image with a solubilizing agent for the pigment whereby the size of the pigmented area is reduced by diffusion etching of the image without affecting the optical density of the image.
Claim 2
Dependent Claim
115 words
A process for the preparation of a dot-etched photopolymerizable lithographic film which comprises (a) exposing imagewise to actinic radiation a photopolymerizable element consisting essentially of a support bearing, in order, (1) a nonphotosensitive layer of a caustic or water soluble polymeric binder having dispersed therein a chemically soluble pigment, and (2) a layer of clear, unpigmented caustic or was soluble photopolymerizable composition comprising a caustic soluble binder; (b) developing the exposed element with a caustic solution and then with water; (c) treating the developed image with a solubilizing agent for the pigment whereby the size of the pigmented area is reduced by diffusion etching of the image without affecting the optical density of the image.
Claim 3
Dependent Claim
18 words
A process according to claim 1 wherein the polymeric binder present in layers 1 and 2 are different.
Claim 4
Dependent Claim
14 words
A process according to claim 1 wherein the chemically soluble pigment is colloidal silver.
Claim 5
Dependent Claim
14 words
A process according to claim 1 wherein the chemically soluble pigment is copper powder.
Claim 6
Dependent Claim
17 words
A process according to claim 1 wherein the photopolymerizable element is overcoated with an aqueous soluble layer.
Claim 7
Dependent Claim
14 words
A process according to claim 5 wherein the aqueous soluble layer is polyvinyl alcohol.
Claim 8
Dependent Claim
28 words
A process according to claim 5 wherein prior to developing the exposed element with caustic solution the element is developed with water to remove the aqueous soluble layer.
Claim 9
Dependent Claim
44 words
A process according to claim 1 wherein the solubilizing agent is taken from the group consisting of K 2 Fe(CN) 6 , FeCl 3 , Na 2 S 2 O 3 , KCNS, KOH, NH 3 , oxalic acid, ethylenediaminetetraacetic acid, and mixtures thereof.
Claim 10
Dependent Claim
31 words
A process according to claim 1 wherein in step (b) the water wash after the caustic treatment is at a temperature below 25° C. to bare areas of the nonphotosensitive layer.
Claim 11
Dependent Claim
20 words
A process according to claim 1 wherein the colloidal silver is bleached with ferricyanide solution and fixed with thiosulfate solution.
Claim 12
Dependent Claim
18 words
A process according to claim 9 wherein the bared areas of the nonphotosensitive layer are bleached and fixed.
Claim 13
Dependent Claim
15 words
A process according to claim 9 wherein the layer (1) contains colloidal silver in gelatin.
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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) | 1989-04-21 | 1989-10-21 | 1990-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-21 | 1993-10-21 | 1994-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-21 | 1997-10-21 | 1998-04-22 | $7700.00 | Window Closed / Lapsed |