US4264708A
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Radiation sensitive element having a thin photopolymerizable layer
Assignee: EIDP Inc
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Filing: 1980-03-26
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Granted: 1981-04-28
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Expires: 2000-03-26
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
2026-10-26 02:05
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/027; G03F7/028; G03F7/031; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/106; Y10S430/111; Y10S430/114; Y10S430/12
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
187 words
A photopolymerizable element for use as a lithographic printing plate consisting essentially of: a substrate bearing a photopolymerizable layer having a dry weight of 10-70 mg/dm 2 , said layer consisting essentially of, as photopolymerizable, radiation-sensitive and binder components: (1) 10-79 percent by weight, based on the total photopolymerizable layer, of ethylenically unsaturated monomer consisting essentially of (a) 75-100 percent by weight 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 ; and (b) 0-25 percent by weight of conventional ethylenically unsaturated monomer; (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.
Claim 2
Dependent Claim
187 words
A photopolymerizable element for use as a lithographic printing plate consisting essentially of: a substrate bearing a photopolymerizable layer having a dry weight of 10-70 mg/dm 2 , said layer consisting essentially of, as photopolymerizable, radiation-sensitive and binder components: (1) 10-79 percent by weight, based on the total photopolymerizable layer, of ethylenically unsaturated monomer consisting essentially of (a) 75-100 percent by weight 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 ; and (b) 0-25 percent by weight of conventional ethylenically unsaturated monomer; (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.
Claim 3
Dependent Claim
22 words
The photopolymerizable element of claim 1 wherein R 4 is hydrogen, p is 1, and R 5 and R 6 are methyl.
Claim 4
Dependent Claim
10 words
The photopolymerizable element of claim 2 wherein n is 1-4.
Claim 5
Dependent Claim
60 words
The photopolymerizable element of claim 3 wherein the p-aminophenyl ketone has the formula ##STR7## wherein R 1 and R 2 are each hydrogen, alkyl of 1-4 carbon atoms, or, together with the shown nitrogen, form a morpholino ring, and R 3 is alkyl of 1-4 carbon atoms, monocarbocyclic aryl or ##STR8## where R 1 and R 2 are as above.
Claim 6
Dependent Claim
22 words
The photopolymerizable element of claim 1 wherein the ethylenically unsaturated diester polyhydroxy polyether is 15-75 percent by weight of the total layer.
Claim 7
Dependent Claim
19 words
The photopolymerizable element of claim 5 wherein R 4 is hydrogen and R 5 and R 6 are methyl.
Claim 8
Dependent Claim
10 words
The photopolymerizable element of claim 6 wherein n is 1-4.
Claim 9
Dependent Claim
60 words
The photopolymerizable element of claim 7 wherein the p-aminophenyl ketone has the formula ##STR9## wherein R 1 and R 2 are each hydrogen, alkyl of 1-4 carbon atoms, or, together with the shown nitrogen, form a morpholino ring, and R 3 is alkyl of 1-4 carbon atoms, monocarbocyclic aryl or ##STR10## where R 1 and R 2 are as above.
Claim 10
Dependent Claim
22 words
The photopolymerizable element of claim 8 wherein the molar ratio of 2,4,5-triarylimidazolyl dimer to p-aminophenyl ketone is in the range of 0.3-1.5:1.
Claim 11
Dependent Claim
30 words
The photopolymerizable element of claim 9 wherein up to 25 percent by weight of the ethylenically unsaturated diester polyhydroxy polyether is replaced with at least one conventional ethylenically unsaturated compound.
Claim 12
Dependent Claim
22 words
The photopolymerizable element of claim 9 wherein the molar ratio of 2,4,5-triarylimidazolyl dimer to p-aminophenyl ketone is in the range of 0.5-1:1.
Claim 13
Dependent Claim
20 words
The photopolymerizable element of claim 11 wherein the p-aminophenyl ketone is Michler's ketone and the 2,4,5-triarylimidazolyl dimer is 2-(o-chlorophenyl)-4,5-diphenylimidazolyl dimer.
Claim 14
Dependent Claim
35 words
The photopolymerizable element of claim 11 wherein the ethylenically unsaturated diester polyhydroxy polyether is 45-75 percent by weight of the total layer and the polymeric binder is 20-50 percent by weight of the total layer.
Claim 15
Dependent Claim
120 words
The photopolymerizable element for use as a lithographic printing plate consisting essentially of: a substrate bearing a photopolymerizable layer having a dry weight of 10-70 mg/dm 2 , said layer comprising: (1) 45-75 percent by weight, based on the total photopolymerizable layer, of at least one ethylenically unsaturated diester polyhydroxy polyether of the formula ##STR11## wherein R is H or CH 3 and n is 1-4; (2) 1-10 percent by weight based on the total photopolymerizable layer, of a polymerization initiating system consisting essentially of a mixture of 2-(o-chlorophenyl)-4,5-diphenylimidazolyl dimer and Michler's ketone at a molar ratio in the range of 0.5-1:1; and (3) 20-50 percent by weight, based on the total photopolymerizable layer, of a macromolecular, organic, polymeric binder.
Claim 16
Dependent Claim
120 words
The photopolymerizable element for use as a lithographic printing plate consisting essentially of: a substrate bearing a photopolymerizable layer having a dry weight of 10-70 mg/dm 2 , said layer comprising: (1) 45-75 percent by weight, based on the total photopolymerizable layer, of at least one ethylenically unsaturated diester polyhydroxy polyether of the formula ##STR11## wherein R is H or CH 3 and n is 1-4; (2) 1-10 percent by weight based on the total photopolymerizable layer, of a polymerization initiating system consisting essentially of a mixture of 2-(o-chlorophenyl)-4,5-diphenylimidazolyl dimer and Michler's ketone at a molar ratio in the range of 0.5-1:1; and (3) 20-50 percent by weight, based on the total photopolymerizable layer, of a macromolecular, organic, polymeric binder.
Claim 17
Dependent Claim
25 words
The photopolymerizable element of claim 14 wherein the substrate is an aluminum sheet and the polymeric binder contains pendant carboxylic acid or sulfonic acid groups.
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) | 1984-04-27 | 1984-10-27 | 1985-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-27 | 1988-10-27 | 1989-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-27 | 1992-10-27 | 1993-04-28 | $7700.00 | Window Closed / Lapsed |