US4124392A
Expired / Lapsed
US
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Cobalt complex amplification imaging system with blocked dye precursor
Assignee: Eastman Kodak Co
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Filing: 1976-09-07
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Granted: 1978-11-07
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Expires: 1996-09-07
Abstract
Abstract An imaging system is provided wherein a blocked dye precursor is activated by an amine to an unblocked form which, in the presence of an inert cobalt (III) complex containing amine releasing ligands, undergoes a redox reaction to form a dye. The amine generated during the redox reaction causes further dye formation, giving increased speed.
Inventors
- 👤 Anthony Adin
- 👤 Thomas J. Huttemann
- 👤 Robert D. Lindholm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:37
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/67; G03C5/00; G03C5/56; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/137
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
200 words
An imaging element comprising at least one image-providing layer, said layer including (a) an inert cobalt (III) complex containing amine ligands, said complex being reducible to a form which releases the ligands, and (b) a blocked dye precursor which is amine activatable to form an unblocked dye precursor capable of an oxidation-reduction reaction with said complex to form a dye, said dye precursor being a blocked leuco dye having the formula ##STR12## wherein COUP is a photographic color-forming coupler connected to the nitrogen atom through a carbon atom at the coupling position; Ar is a substituted or unsubstituted para-phenylene group containing from 6 to about 20 carbon atoms, the substituents of which are halogen atoms in the ortho or meta position of the ring; and X is either an amino group, a hydroxyl group, or the group: --O--R.sup.1 wherein R 1 is a hydrolyzable carbonyl-containing group of the formula ##STR13## wherein R 4 is a group containing 1 to 12 carbon atoms and is an alkyl group or an aryl group; and R 2 is a hydrogen atom or the same substituent as R 1 , provided that at least one of X and R 2 is a carbonyl-containing group.
Claim 2
Dependent Claim
200 words
An imaging element comprising at least one image-providing layer, said layer including (a) an inert cobalt (III) complex containing amine ligands, said complex being reducible to a form which releases the ligands, and (b) a blocked dye precursor which is amine activatable to form an unblocked dye precursor capable of an oxidation-reduction reaction with said complex to form a dye, said dye precursor being a blocked leuco dye having the formula ##STR12## wherein COUP is a photographic color-forming coupler connected to the nitrogen atom through a carbon atom at the coupling position; Ar is a substituted or unsubstituted para-phenylene group containing from 6 to about 20 carbon atoms, the substituents of which are halogen atoms in the ortho or meta position of the ring; and X is either an amino group, a hydroxyl group, or the group: --O--R.sup.1 wherein R 1 is a hydrolyzable carbonyl-containing group of the formula ##STR13## wherein R 4 is a group containing 1 to 12 carbon atoms and is an alkyl group or an aryl group; and R 2 is a hydrogen atom or the same substituent as R 1 , provided that at least one of X and R 2 is a carbonyl-containing group.
Claim 3
Dependent Claim
25 words
An element as defined in claim 1 wherein said element is substantially free of a photoactivator, whereby the element is substantially insensitive to visible light.
Claim 4
Dependent Claim
65 words
An element as defined in claim 1 and further including a radiation-sensitive layer adjacent to said image-providing layer, said radiation-sensitive layer including (a) an inert cobalt (III) complex containing amine ligands, and complex being reducible to a form which releases the ligands, and (b) a photoactivator responsive to radiation within at least the visible spectrum, said photoactivator being either a spectral sensitizer or a photo-reductant.
Claim 5
Dependent Claim
13 words
An element as defined in claim 3 wherein said photoreductant is a quinone.
Claim 6
Dependent Claim
18 words
An element as defined in claim 3 wherein said radiation-sensitive layer is removably associated with said image-providing layer.
Claim 7
Dependent Claim
29 words
An element as defined in claim 3 and further including a third layer positioned between said image-providing layer and said radiation-sensitive layer, said third layer comprising a gas-permeable polymer.
Claim 8
Dependent Claim
24 words
An element as defined in claim 1 and further including in said layer a photoactivator which is either a spectral sensitizer or a photoreductant.
Claim 9
Dependent Claim
45 words
An element as defined in claim 1 and further including in said layer a compound containing a conjugated π-bonding system capable of forming at least a bidentate chelate with cobalt (III), said layer excluding acid anions having pKa values sufficient to deprotonate cobalt (II) chelates.
Claim 10
Dependent Claim
13 words
An element as defined in claim 1 wherein said complex contains amine ligands.
Claim 11
Dependent Claim
15 words
An element as defined in claim 9 wherein said complex is hexa-ammine cobalt (III) trifluoroacetate.
Claim 12
Dependent Claim
15 words
An element as defined in claim 1 wherein said complex is tris(1,3-propanediamine) cobalt (III) trifluoroacetate.
Claim 13
Dependent Claim
138 words
An imaging element comprising at least one image-providing layer, said layer including (a) an inert cobalt (III) complex containing amine ligands, said complex being reducible to a form which releases the ligands, and (b) a blocked dye precursor which is amine activatable to form an unblocked dye precursor capable of an oxidation-reduction reaction with said complex to form a dye, said blocked dye precursor having the formula ##STR14## wherein Ar is a substituted or unsubstituted para-phenylene group containing from 6 to about 20 carbon atoms, the substituents of which are halogen atoms in the ortho or metaposition of the ring; X is R 5' NR 6 , or N'HSO 2 R 7 ; and R 5 , R 6 , and R 7 are alkyl or alkylsulfonyl having from 1 to 10 carbon atoms in the alkyl portion.
Claim 14
Dependent Claim
138 words
An imaging element comprising at least one image-providing layer, said layer including (a) an inert cobalt (III) complex containing amine ligands, said complex being reducible to a form which releases the ligands, and (b) a blocked dye precursor which is amine activatable to form an unblocked dye precursor capable of an oxidation-reduction reaction with said complex to form a dye, said blocked dye precursor having the formula ##STR14## wherein Ar is a substituted or unsubstituted para-phenylene group containing from 6 to about 20 carbon atoms, the substituents of which are halogen atoms in the ortho or metaposition of the ring; X is R 5' NR 6 , or N'HSO 2 R 7 ; and R 5 , R 6 , and R 7 are alkyl or alkylsulfonyl having from 1 to 10 carbon atoms in the alkyl portion.
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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) | 1981-11-06 | 1982-05-08 | 1982-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-06 | 1986-05-08 | 1986-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-06 | 1990-05-08 | 1990-11-07 | $7700.00 | Window Closed / Lapsed |