US4252887A
Expired / Lapsed
US
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Dimers derived from unsymmetrical 2,4,5-triphenylimidazole compounds as photoinitiators
Assignee: EIDP Inc
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Filing: 1979-08-14
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Granted: 1981-02-24
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Expires: 1999-08-14
Abstract
Abstract Photoimaging compositions comprising (A) 2,4,5-triphenylimidazolyl dimer having selected substituents on the 2,4 and 5 phenyl rings and an extinction coefficient determined in methylene chloride at 10 -5 to 10 -3 mol/liter at 350 nm of at least 4000 liters/mol-cm and at 400 nm of at least 250 liters/mol-cm; and at least one of (B1) leuco dye or (B2) addition polymerizable ethylenically unsaturated monomeric compound. The new imaging compositions are useful in preparing dual response photoimaging products such as proofing papers, printout paper, overlay films and photopolymerizable elements. Improved imaging speed is achieved at equal concentration levels when compared with conventional 2,4,5-triphenylimidazolyl dimers.
Inventors
- 👤 Rolf Dessauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:30
CPC Classifications
C; C07; C07D; C07D233/00; C07D233/54; C07D233/64; G; G03; G03C; G03C1/00; G03C1/72; G03C1/73; G03C1/732; G03F; G03F7/00; G03F7/004; G03F7/09; G03F7/105; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/114; Y10S430/116; Y10S430/118; Y10S430/12; Y10S430/121
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
132 words
Photoimaging composition comprising an admixture of 0.1 to 15.47% by weight of solids of a 2,4,5-triphenylimidazolyl dimer of the formula ##STR21## wherein R 1 is 2-bromo, 2-chloro, 2-fluoro, 2-alkyl of 1 to 4 carbon atoms and 2,4-dichloro; R 2 is 2-bromo, 2-chloro, 2-fluoro, 4-chloro, 2-alkyl of 1 to 4 carbon atoms, 2-cyano, and 2-alkoxy wherein the alkyl radical is of 1 to 4 carbon atoms; and R 3 is 3,4-dimethoxy, 3,4-diethoxy, 2,3-dimethoxy, 2,4,6-trimethoxy, 4-alkoxy wherein the alkyl radical is of 1 to 4 carbon atoms and 3,4-methylenedioxy; the imidazolyl dimer having an extinction coefficient determined in methylene chloride at 10 -5 to 10 -3 mol/liter at 350 nm of at least 4000 liters/mol-cm and at 400 nm of at least 250 liters/mol-cm; and at least one addition polymerizable ethylenically unsaturated monomeric compound.
Claim 2
Dependent Claim
132 words
Photoimaging composition comprising an admixture of 0.1 to 15.47% by weight of solids of a 2,4,5-triphenylimidazolyl dimer of the formula ##STR21## wherein R 1 is 2-bromo, 2-chloro, 2-fluoro, 2-alkyl of 1 to 4 carbon atoms and 2,4-dichloro; R 2 is 2-bromo, 2-chloro, 2-fluoro, 4-chloro, 2-alkyl of 1 to 4 carbon atoms, 2-cyano, and 2-alkoxy wherein the alkyl radical is of 1 to 4 carbon atoms; and R 3 is 3,4-dimethoxy, 3,4-diethoxy, 2,3-dimethoxy, 2,4,6-trimethoxy, 4-alkoxy wherein the alkyl radical is of 1 to 4 carbon atoms and 3,4-methylenedioxy; the imidazolyl dimer having an extinction coefficient determined in methylene chloride at 10 -5 to 10 -3 mol/liter at 350 nm of at least 4000 liters/mol-cm and at 400 nm of at least 250 liters/mol-cm; and at least one addition polymerizable ethylenically unsaturated monomeric compound.
Claim 3
Dependent Claim
32 words
A photopolymerizable composition according to claim 1 wherein at least one agent selected from the group consisting of a free radical producing hydrogen donor agent and an active methylene compound is present.
Claim 4
Dependent Claim
14 words
A photopolymerizable composition according to claim 2 wherein the agent is a leuco dye.
Claim 5
Dependent Claim
14 words
A photopolymerizable composition according to claim 2 wherein a film-forming polymeric binder is present.
Claim 6
Dependent Claim
18 words
A photopolymerizable composition according to claim 4 wherein the polymeric binder is a methylmethacrylate containing polymer or copolymer.
Claim 7
Dependent Claim
14 words
A photopolymerizable composition according to claim 4 wherein a chain transfer agent is present.
Claim 8
Dependent Claim
14 words
A photopolymerizable composition according to claim 6 wherein the chain transfer agent is 2-mercaptobenzothiazole.
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) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |