US4308338A
Expired / Lapsed
US
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Methods of imaging photopolymerizable materials containing diester polyether
Assignee: EIDP Inc
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Filing: 1980-12-04
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Granted: 1981-12-29
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Expires: 2000-12-04
Abstract
Abstract A photopolymerizable element, preferably a lithographic plate, is provided. This element comprises a substrate bearing a photopolymerizable layer having a weight of about 1 to about 90 mg/dm 2 , said layer comprising: (1) at least one ethylenically unsaturated diester polyhydroxy polyether of the formula ##STR1## wherein R is H or CH 3 ; R 4 is H or an alkyl of 1-4 carbon atoms; n is 1-15; p is 0 or 1; and, when p is 1, R 5 is H or CH 3 , and R 6 is H, CH 3 or C 2 H 5 ; (2) an organic, radiation-sensitive, free-radical generating system comprising 2,4,5-triarylimidazolyl dimer and p-aminophenyl ketone; and (3) a macromolecular, organic, polymeric binder. A polymeric image is formed by imagewise exposing the layer to actinic radiation and then developing the resulting image such as by removing unexposed portions of the layer with a solvent.
Inventors
- 👤 William J. Chambers
- 👤 Christina N. Lazaridis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:37
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/027; G03F7/028; G03F7/031
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
183 words
A method of producing a polymeric image comprising: (a) applying to a substrate a layer having a dry weight of 10-70 mg/dm 2 of a photopolymerizable composition comprising: (1) 10-79 percent by weight based on the total photopolymerizable layer of at least one ethylenically unsaturated diester polyhydroxy polyether of the formula ##STR6## wherein R is H or CH 3 ; R 4 is H or an alkyl of 1-4 carbon atoms; n is 1-15; p is 0 or 1; and when p is 1, R 5 is H or CH 3 , and R 6 is H, CH 3 or C 2 H 5 ; (2) 1-10 percent by weight, based on the total photopolymerizable layer, of an organic, radiation-sensitive, free-radical generating system comprising at least one 2,4,5-triarylimidazolyl dimer and at least one p-aminophenyl ketone; and (3) 20-80 percent by weight, based on the total photopolymerizable layer, of a macromolecular, organic, polymeric binder; (b) imagewise exposing a portion of the photopolymerizable layer to actinic radiation whereby the ethylenically unsaturated diester compound is polymerized in the radiation-struck areas; and (c) developing the resulting image.
Claim 2
Independent Claim
183 words
A method of producing a polymeric image comprising: (a) applying to a substrate a layer having a dry weight of 10-70 mg/dm 2 of a photopolymerizable composition comprising: (1) 10-79 percent by weight based on the total photopolymerizable layer of at least one ethylenically unsaturated diester polyhydroxy polyether of the formula ##STR6## wherein R is H or CH 3 ; R 4 is H or an alkyl of 1-4 carbon atoms; n is 1-15; p is 0 or 1; and when p is 1, R 5 is H or CH 3 , and R 6 is H, CH 3 or C 2 H 5 ; (2) 1-10 percent by weight, based on the total photopolymerizable layer, of an organic, radiation-sensitive, free-radical generating system comprising at least one 2,4,5-triarylimidazolyl dimer and at least one p-aminophenyl ketone; and (3) 20-80 percent by weight, based on the total photopolymerizable layer, of a macromolecular, organic, polymeric binder; (b) imagewise exposing a portion of the photopolymerizable layer to actinic radiation whereby the ethylenically unsaturated diester compound is polymerized in the radiation-struck areas; and (c) developing the resulting image.
Claim 3
Dependent Claim
21 words
The method of claim 1 wherein R 4 is hydrogen, p is 1, and R 5 and R 6 are methyl.
Claim 4
Dependent Claim
21 words
The method of claim 2 wherein n is 1-4 and the actinic radiation contains wavelengths in the range of 2000-8000 A.
Claim 5
Dependent Claim
34 words
The method of claim 3 wherein the photopolymerizable layer is exposed to the actinic radiation through an image-bearing transparency, and the image is developed by removing unexposed portions of the layer with a solvent.
Claim 6
Dependent Claim
21 words
The method of claim 3 wherein the molar ratio of 2,4,5-triarylimidazolyl dimer to p-aminophenyl ketone is in the range of 0.5-1.1.
Claim 7
Dependent Claim
45 words
The method of claim 5 wherein the photopolymerizable layer is exposed to the actinic radiation through an image-bearing transparency, the image is developed by removing unexposed portions of the layer with a solvent, and the actinic radiation contains wavelengths in the range of 2500-5000 A.
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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) | 1984-12-28 | 1985-06-29 | 1985-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-28 | 1989-06-29 | 1989-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-28 | 1993-06-29 | 1993-12-29 | $7700.00 | Window Closed / Lapsed |