US3791845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elements containing brightener compositions
Assignee: Eastman Kodak Co
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Filing: 1972-06-09
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Granted: 1974-02-12
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Expires: 1992-06-09
Abstract
Abstract Hydrophilic colloids having intimately dispersed therein an essentially hydrophobic solid solution of an oil-soluble brightening agent in an essentially hydrophobic organic solvent that is rigid (an organic glass) at room temperature, i.e., has a glass transition temperature (Tg) that is above about 25*C. and is a polymer that is an acetal condensation product of polyvinyl alcohol and an aldehyde or ketone having from two to 40 carbon atoms are advantageously used in photographic elements and in image receiving elements for image diffusion transfer because the light-stability of the brightening agents in these dispersions is increased substantially over the light-stability of the same brightening agents in dispersions outside the immediate invention.
Inventors
- 👤 R Tuite
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:54
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/24; G03C8/26; G03C8/28; G03C1/00; G03C1/76; G03C1/815; Y; Y10; Y10S; Y10S430/00; Y10S430/134
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
26 words
An element of claim 1 in which said hydrophilic colloid layer containing the dispersion of said solution of brightening agent also contains a silver precipitating agent.
Claim 2
Dependent Claim
35 words
An element of claim 1 in which said hydrophilic colloid layer containing the dispersion of said solution of brightening agent also contains a mordant capable of forming a nondiffusible dye salt with a diffusible dye.
Claim 3
Dependent Claim
71 words
The element of claim 1 wherein the oil-soluble brightening agent is selected from the class consisting of a vinylene brightening agent, a coumarin, a thiophene, a furan, an anthracene, a pyrazoline, a fluorene, a carbazole, a 1,8-naphthalic acid imide and a 2-oxo-2,4-dihydrofuro(2,3-b)quinoxaline brightening agent dissolved in a rigid, essentially hydrophobic organic solvent having a glass transition temperature above about 25*C, said solvent being a polymer containing recurring units having the formula:
Claim 4
Dependent Claim
13 words
The element of claim 1 wherein the oil-soluble brightening agent has the formula
Claim 5
Dependent Claim
13 words
The element of claim 1 wherein the oil-soluble brightening agent has the formula
Claim 6
Dependent Claim
13 words
The element of claim 1 wherein the oil-soluble brightening agent has the formula:
Claim 7
Dependent Claim
23 words
The element of claim 1 wherein the rigid Essentially hydrophobic solvent comprises copoly(vinylacetal) (vinyl 2-carboxy benzoate) (vinyl alcohol) (vinyl acetate) 80:15:3:2 by weight.
Claim 8
Dependent Claim
21 words
The element of claim 1 wherein the rigid, essentially hydrophobic solvent comprises copoly(vinyl butyral) (vinyl alcohol) (vinyl acetate) 88:9:3 by weight.
Claim 9
Dependent Claim
13 words
The element of claim 1 in which the brightening agent is 4, 4''-di(5,7-di-t-amylbenzoxazolyl)stilbene.
Claim 10
Dependent Claim
12 words
The element of claim 1 in which the brightening agent is 3-phenyl-7-(4''-chloro-6''-diethylamino-s-triazinyl-(2'')-amino)coumarin.
Claim 11
Dependent Claim
13 words
The element of claim 1 in which the brightening agent is 2, 5-bis(5,7-di-t-amylbenzoxazolyl)thiophene.
Claim 12
Dependent Claim
12 words
The element of claim 1 in which the brightening agent is 7-diethylamino-4-methyl-coumarin.
Claim 13
Dependent Claim
12 words
The element of claim 1 in which the brightening agent is 9-cyanoanthracene.
Claim 14
Dependent Claim
12 words
The element of claim 1 in which the brightening agent is 3-phenyl-4-methyl-2-oxo-2,4-dihydrofuro(2,3-b)quinoxaline.
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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |