US4201590A
Expired / Lapsed
US
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Heat sensitive reactive products of hexaarylbiimidazole and antihalation dyes
Assignee: Eastman Kodak Co
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Filing: 1978-10-23
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Granted: 1980-05-06
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Expires: 1998-10-23
Abstract
Abstract A heat bleachable material comprises (i) at least one hexaarylbiimidazole with (ii) at least one dye, especially an antihalation or filter dye, that is reactive with the product of the hexaarylbiimidazole formed upon heating the material to a temperature above about 90° C. This provides a material that becomes at least 40% colorless within about 20 minutes, typically within about 30 seconds, upon heating to a temperature as described. The dye-containing material is especially useful for antihalation and filter purposes in a photographic element. The material can be a heat bleachable dye layer of a photothermographic element. The heat bleachable dye layer can also be useful in a thermographic element.
Inventors
- 👤 Steven R. Levinson
- 👤 Anthony Adin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:24
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/494; G03C1/498; G03C1/49836; G03C1/49845; G03C1/49854; G03C1/76; G03C1/825; G03C1/83; Y; Y10; Y10S; Y10S430/00; Y10S430/165
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
66 words
A colored, heat bleachable antihalation composition consisting essentially of, in reactive association, (i) at least one hexaarylbiimidazole with (ii) at least one antihalation dye that is reactive with the product formed upon heating said hexaarylbiimidazole to a temperature of at least about 90° C., and wherein said composition becomes essentially colorless within about 20 minutes upon heating to a temperature of at least about 90° C.
Claim 2
Dependent Claim
66 words
A colored, heat bleachable antihalation composition consisting essentially of, in reactive association, (i) at least one hexaarylbiimidazole with (ii) at least one antihalation dye that is reactive with the product formed upon heating said hexaarylbiimidazole to a temperature of at least about 90° C., and wherein said composition becomes essentially colorless within about 20 minutes upon heating to a temperature of at least about 90° C.
Claim 3
Dependent Claim
53 words
A colored, heat bleachable antihalation composition as in claim 1 consisting essentially of, in reactive association, (i) at least one hexaarylbiimidazole with (ii) at least one formazan antihalation dye, wherein said composition becomes at least about 90% colorless within about 20 minutes upon heating to a temperature of at least about 90° C.
Claim 4
Dependent Claim
24 words
A colored, heat bleachable antihalation composition as in claim 1 wherein said dye consists essentially of a formazan dye represented by the formula: ##STR22##
Claim 5
Dependent Claim
20 words
A colored, heat bleachable antihalation composition as in claim 1 wherein said dye consists essentially of a metallized formazan dye.
Claim 6
Dependent Claim
20 words
A colored, heat bleachable antihalation composition as in claim 1 wherein said dye consists essentially of a zinc-formazan dye complex.
Claim 7
Dependent Claim
37 words
A colored, heat bleachable antihalation composition as in claim 1 wherein said dye consists essentially of a zinc-formazan dye complex consisting essentially of a complex of zinc chloride with a formazan dye represented by the formula: ##STR23##
Claim 8
Dependent Claim
37 words
A colored, heat bleachable antihalation composition as in claim 1 wherein said dye consists essentially of a cobalt-formazan dye complex consisting essentially of a complex of cobaltous nitrate with a formazan dye represented by the formula: ##STR24##
Claim 9
Dependent Claim
37 words
A colored, heat bleachable antihalation composition as in claim 1 wherein said dye consists essentially of a copper-formazan dye complex consisting essentially of a complex of cupric acetate with a formazan dye represented by the formula: ##STR25##
Claim 10
Dependent Claim
17 words
A colored, heat bleachable antihalation composition as in claim 1 also consisting essentially of a polymeric binder.
Claim 11
Dependent Claim
34 words
A colored, heat bleachable antihalation composition as in claim 1 wherein said composition becomes at least 90% colorless within less than about 30 seconds upon heating to a temperature of at least 120° C.
Claim 12
Dependent Claim
17 words
A colored, heat bleachable antihalation composition as in claim 1 also consisting essentially of a polysulfonamide binder.
Claim 13
Dependent Claim
18 words
A colored, heat bleachable antihalation composition as in claim 1 also consisting essentially of a poly(ethylene-co-1,4-cyclohexylenedimethylene-1-methyl-2,4-benzene disulfonamide) binder.
Claim 14
Dependent Claim
19 words
A colored, heat bleachable antihalation composition as in claim 1 also consisting essentially of a maleic anhydride-styrene copolymer binder.
Claim 15
Dependent Claim
18 words
A colored, heat bleachable antihalation composition as in claim 1 also consisting essentially of a poly(methyl methacrylate) binder.
Claim 16
Dependent Claim
45 words
A colored, heat bleachable antihalation composition as in claim 1 wherein said hexaarylbiimidazole consists essentially of an oxidative arylimidazole dimer of a compound represented by the formula: ##STR26## wherein R and R' are individually selected from alkyl containing 1 to 4 carbon atoms and hydrogen.
Claim 17
Dependent Claim
18 words
A colored, heat bleachable antihalation composition as in claim 15 wherein R' is isopropyl and R is hydrogen.
Claim 18
Dependent Claim
88 words
A colored, heat bleachable antihalation composition consisting essentially of a combination of (i) at least one oxidative arylimidazole dimer of a compound represented by the formula: ##STR27## wherein R and R' are isopropyl or hydrogen and at least one of R and R' is isopropyl, with (ii) at least one formazan antihalation dye, and (iii) a polymeric binder comprising a maleic anhydride-styrene copolymer, wherein said combination becomes at least about 90% colorless within less than about 30 seconds upon heating to a temperature of at least 120° C.
Claim 19
Dependent Claim
88 words
A colored, heat bleachable antihalation composition consisting essentially of a combination of (i) at least one oxidative arylimidazole dimer of a compound represented by the formula: ##STR27## wherein R and R' are isopropyl or hydrogen and at least one of R and R' is isopropyl, with (ii) at least one formazan antihalation dye, and (iii) a polymeric binder comprising a maleic anhydride-styrene copolymer, wherein said combination becomes at least about 90% colorless within less than about 30 seconds upon heating to a temperature of at least 120° C.
Claim 20
Dependent Claim
71 words
A colored, heat bleachable antihalation composition consisting essentially of a combination of (i) an oxidative dimer of triphenylimidazole, (ii) a metallized formazan dye consisting essentially of a complex of zinc chloride with a formazan dye represented by the formula: ##STR28## and (iii) a maleic anhydride-styrene copolymer binder, wherein said combination becomes at least 90% colorless within less than about 30 seconds upon heating to a temperature of at least 120° C.
Claim 21
Dependent Claim
71 words
A colored, heat bleachable antihalation composition consisting essentially of a combination of (i) an oxidative dimer of triphenylimidazole, (ii) a metallized formazan dye consisting essentially of a complex of zinc chloride with a formazan dye represented by the formula: ##STR28## and (iii) a maleic anhydride-styrene copolymer binder, wherein said combination becomes at least 90% colorless within less than about 30 seconds upon heating to a temperature of at least 120° C.
Claim 22
Dependent Claim
60 words
A colored, heat bleachable antihalation composition consisting essentially of a combination of (i) an oxidative dimer of triphenylimidazole, (ii) a formazan dye represented by the formula: ##STR29## and a polymeric binder consisting essentially of poly(methyl methacrylate), wherein said composition becomes at least 90% colorless within less than about 30 seconds upon heating to a temperature of at least 120° C.
Claim 23
Dependent Claim
60 words
A colored, heat bleachable antihalation composition consisting essentially of a combination of (i) an oxidative dimer of triphenylimidazole, (ii) a formazan dye represented by the formula: ##STR29## and a polymeric binder consisting essentially of poly(methyl methacrylate), wherein said composition becomes at least 90% colorless within less than about 30 seconds upon heating to a temperature of at least 120° C.
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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) | 1983-05-06 | 1983-11-05 | 1984-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-06 | 1987-11-05 | 1988-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-06 | 1991-11-05 | 1992-05-06 | $7700.00 | Window Closed / Lapsed |