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Patent US4243741A successfully refreshed from Google Patents.
US4243741A
Expired / Lapsed
US
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Negative tonable systems containing dihydropyridines and photooxidants
Assignee: EIDP Inc
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Filing: 1978-12-21
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Granted: 1981-01-06
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Expires: 1998-12-21
Abstract
Abstract A photosensitive element for preparing negative tonable images which comprises a support bearing a layer of a photosensitive composition comprising a thermoplastic binder, at least one dihydropyridine compound and at least one hexaarylbiimidazole compound. Optionally softeners and sensitizer can be present in the photosensitive layer. The photosensitive element is useful in preparing negative tonable images.
Inventors
- 👤 Werner Abele
- 👤 Mario Grossa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:06
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/26; G03F7/28; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/114; Y10S430/117; Y10S430/12; Y10S430/121
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
145 words
A negative working photosensitive element for the preparation of negative tonable images which comprises a support bearing a photosensitive layer comprising at least one thermoplastic binder and a photosensitive system, the improvement being that the photosensitive system consists essentially of I. at least one dihydropyridine compound of the formula ##STR3## wherein R is alkyl, alkenyl of 3 to 11 carbon atoms, phenylalkyl, phenylalkenyl, unsubstituted aryl of 6 to 10 carbon atoms or unsubstituted heteroaryl, R 1 and R 2 , which can be the same or different, are alkyl, and R 3 and R 4 , which can be the same or different, are COOR', COR', CN, R' is alkyl; and II. at least one hexaarylbiimidazole compound of the formula ##STR4## wherein the radicals A, B and D are either identical or different and are optionally substituted aryl groups derived from carbocyclic or heterocyclic compounds.
Claim 2
Dependent Claim
145 words
A negative working photosensitive element for the preparation of negative tonable images which comprises a support bearing a photosensitive layer comprising at least one thermoplastic binder and a photosensitive system, the improvement being that the photosensitive system consists essentially of I. at least one dihydropyridine compound of the formula ##STR3## wherein R is alkyl, alkenyl of 3 to 11 carbon atoms, phenylalkyl, phenylalkenyl, unsubstituted aryl of 6 to 10 carbon atoms or unsubstituted heteroaryl, R 1 and R 2 , which can be the same or different, are alkyl, and R 3 and R 4 , which can be the same or different, are COOR', COR', CN, R' is alkyl; and II. at least one hexaarylbiimidazole compound of the formula ##STR4## wherein the radicals A, B and D are either identical or different and are optionally substituted aryl groups derived from carbocyclic or heterocyclic compounds.
Claim 3
Dependent Claim
17 words
A photosensitive element according to claim 1 wherein a softening agent is present in the photosensitive layer.
Claim 4
Dependent Claim
13 words
A photosensitive element according to claim 1 wherein the dihydropyridine compound is 2,4,6-trimethyl-3,5-bis(carbethoxy)-1,4-dihydropyridine.
Claim 5
Dependent Claim
13 words
The photosensitive element according to claim 1 wherein the dihydropyridine compound is 2,6-dimethyl-4-ethyl-3,5-bis(carbethoxy)-1,4-dihydropyridine.
Claim 6
Dependent Claim
13 words
A photosensitive element according to claim 1 wherein the dihydropyridine compound is 2,6-dimethyl-4-n-propyl-3,5-bis(carbethoxy)-1,4-dihydropyridine.
Claim 7
Dependent Claim
13 words
A photosensitive element according to claim 1 wherein the dihydropyridine compound is 2,6-dimethyl-4-benzyl-3,5-bis(carbethoxy)-1,4-dihydropyridine.
Claim 8
Dependent Claim
14 words
A photosensitive element according to claim 1 wherein the hexaarylbiimidazole compound is 2,2', 4,4,5,5'-hexaphenylbiimidazole.
Claim 9
Dependent Claim
13 words
A photosensitive element according to claim 1 wherein the hexaarylbiimidazole compound is 2,2'-bis(2-chlorophenyl)-4,4',5,5'-tetraphenylbiimidazole.
Claim 10
Dependent Claim
13 words
A photosensitive element according to claim 1 wherein the hexaarylbiimidazole compound is 2,2'-bis(2-chlorophenyl)-4,4',5,5,'-tetrakis(3-methoxyphenyl)biimidazole.
Claim 11
Dependent Claim
13 words
A photosensitive element according to claim 1 wherein the hexaarylbiimidazole compound is 2,2'-bis(2-methoxyphenyl)-4,4',5,5'-tetraphenylbiimidazole.
Claim 12
Dependent Claim
18 words
A photosensitive element according to claims 1 or 2 wherein a sensitizer is present in the photosensitive layer.
Claim 13
Dependent Claim
20 words
A photosensitive layer according to claim 11 wherein the sensitizer is taken from the class of Michler's ketone and benzophenone.
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) | 1984-01-06 | 1984-07-07 | 1985-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-06 | 1988-07-07 | 1989-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-06 | 1992-07-07 | 1993-01-06 | $7700.00 | Window Closed / Lapsed |