Patent US4336326A successfully refreshed from Google Patents.
US4336326A
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Optical brightening agents and photographic materials which contain these brightening agents
Assignee: Ha Whitten & Co
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Filing: 1981-04-06
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Granted: 1982-06-22
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Expires: 2001-04-06
Abstract
Abstract New optical brightening agents and photographic materials which contain in at least one layer these brightening agents are provided. The compounds have the general formula ##STR1## wherein R 1 and R 3 are hydrogen or methyl, R 2 and R 4 are alkyl R 5 is hydrogen, alkyl, aryl, aralkyl, X is --NH--, --O-- or --S--, L 1 and L 2 are alkylene oxide chains and M.sup.⊕ is a hydrogen or an alkali metal cation. These brightening agents enhance the brightness in the white areas of photographic print materials.
Inventors
- 👤 Graham Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:42
CPC Classifications
C; C07; C07D; C07D251/00; C07D251/02; C07D251/12; C07D251/26; C07D251/40; C07D251/48; C07D251/52; C07D251/42; C07D251/46; G; G03; G03C; G03C1/00; G03C1/76; G03C1/815; G03C1/8155; Y; Y10; Y10S; Y10S430/00; Y10S430/134; Y10S430/151
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
112 words
Photographic material having a white base and at least one silver halide emulsion layer and in one layer of the photographic material on the same side as the silver halide emulsion layer a brightening agent of the formula ##STR12## wherein R 1 and R 3 are each hydrogen or methyl, R 2 and R 4 are alkyl having at least six carbon atoms, R 5 is hydrogen or alkyl, aryl or aralkyl, X is --NH--, --O-- or --S--, L 1 and L 2 are each alkylene oxide chains having two to 20 alkylene oxide units in the chain and M.sup.⊕ is a hydrogen or an alkaline metal cation in a colloid binder.
Claim 2
Dependent Claim
112 words
Photographic material having a white base and at least one silver halide emulsion layer and in one layer of the photographic material on the same side as the silver halide emulsion layer a brightening agent of the formula ##STR12## wherein R 1 and R 3 are each hydrogen or methyl, R 2 and R 4 are alkyl having at least six carbon atoms, R 5 is hydrogen or alkyl, aryl or aralkyl, X is --NH--, --O-- or --S--, L 1 and L 2 are each alkylene oxide chains having two to 20 alkylene oxide units in the chain and M.sup.⊕ is a hydrogen or an alkaline metal cation in a colloid binder.
Claim 3
Dependent Claim
28 words
Photographic material according to claim 1 wherein the brightening agent is present in a photographic layer in an amount of from 1% to 10% based on total binder.
Claim 4
Dependent Claim
11 words
Photographic material according to claim 1 wherein the binder is gelatin.
Claim 5
Dependent Claim
55 words
Photographic material having a white base and at least one silver halide emulsion layer and in one layer of the photographic material on the same side as the silver halide emulsion layer a polymer formed from a latex which comprises a brightening agent of formula (1) as claimed in claim 1 in a colloid binder.
Claim 6
Dependent Claim
18 words
Photographic material according to claim 1 wherein the layer which comprises the brightening agent is the supercoat layer.
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) | 1985-06-21 | 1985-12-21 | 1986-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-21 | 1989-12-21 | 1990-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-21 | 1993-12-21 | 1994-06-22 | $7700.00 | Window Closed / Lapsed |