US4567130A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for etching single photopolymer layer utilizing chemically soluble pigments
Assignee: EIDP Inc
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Filing: 1984-07-27
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Granted: 1986-01-28
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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 a layer of caustic soluble photopolymerizable composition having dispersed therein a chemically soluble pigment, e.g., iron oxide, and optionally an overcoat layer; (b) developing the exposed element with caustic solution; and (c) treating the developed element with a chemical solubilizing agent for the pigment. A lithographic film is prepared.
Inventors
- 👤 Robert P. Held
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:01
CPC Classifications
G; G03; G03F; G03F1/00; G03F1/54; G03F1/56
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
91 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 a layer of a caustic soluble photopolymerizable composition having dispersed therein a chemically soluble pigment; (b) developing the exposed element with a caustic solution to form at least one pigmented image area; and (c) treating the developed element with a chemical solubilizing agent for the pigment whereby the size and density of the pigmented area is reduced by diffusion etching of the image.
Claim 2
Dependent Claim
91 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 a layer of a caustic soluble photopolymerizable composition having dispersed therein a chemically soluble pigment; (b) developing the exposed element with a caustic solution to form at least one pigmented image area; and (c) treating the developed element with a chemical solubilizing agent for the pigment whereby the size and density of the pigmented area is reduced by diffusion etching of the image.
Claim 3
Dependent Claim
14 words
A process according to claim 1 wherein the chemically soluble pigment is iron oxide.
Claim 4
Dependent Claim
14 words
A process according to claim 1 wherein the chemically soluble pigment is zinc oxide.
Claim 5
Dependent Claim
17 words
A process according to claim 1 wherein the photopolymerizable element is overcoated with an aqueous soluble layer.
Claim 6
Dependent Claim
14 words
A process according to claim 4 wherein the aqueous soluble layer is polyvinyl alcohol.
Claim 7
Dependent Claim
20 words
A process according to claim 1 wherein the developed element is treated in step (c) with an acid solubilizing agent.
Claim 8
Dependent Claim
14 words
A process according to claim 6 wherein the acid solubilizing agent is hydrochloric acid.
Claim 9
Dependent Claim
20 words
A process according to claim 1 wherein the developed element is treated in step (c) with a neutral solubilizing agent.
Claim 10
Dependent Claim
13 words
A process according to claim 8 wherein the solubilizing agent is sodium thiosulfate.
Claim 11
Dependent Claim
21 words
A process according to claim 1 wherein the developed element is treated in step (c) with a hydroxide compound or ammonia.
References Cited (Backward Citations)
US3415698A
Cited
US4173673A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-27 | 1989-07-29 | 1990-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-27 | 1993-07-29 | 1994-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-27 | 1997-07-29 | 1998-01-28 | $7700.00 | Window Closed / Lapsed |