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US5395748A
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Ballasted optical brighteners
Assignee: Eastman Kodak Co
•
Filing: 1993-12-08
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Granted: 1995-03-07
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Expires: 2013-12-08
Abstract
Abstract An inexpensive, ballasted optical brightener for use in photographic elements is prepared by reacting an optical brightener of the formula ##STR1## where M is a cation; X is a group capable of undergoing nucleophilic displacement; and Z is ##STR2## or --O--R 3 , where each of R1 and R2 is a hydrogen atom, or an aromatic group which can be unsubstituted or substituted with one or more groups unreactive towards X; and R3 is an aromatic group which can be unsubstituted or substituted with one or more groups unreactive towards X with a water soluble polymer, such as gelatin. The resulting ballasted optical brightener is stable in aqueous photographic compositions.
Inventors
- 👤 Anthony Adin
- 👤 Pranab Bagchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:06
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/815; G03C1/8155; D; D06; D06L; D06L4/00; D06L4/60; D06L4/614; D06L4/621; G03C1/005; G03C1/04; G03C1/047; G03C2200/00; G03C2200/47; Y; Y10; Y10S; Y10S430/00; Y10S430/134
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
86 words
A ballasted water-soluble optical brightener of the formula: ##STR15## wherein Polymer is a gelatin residue; M is a cation; X is a group capable of undergoing nucleophilic displacement; and Z is ##STR16## or --O--R 3 , where each of R 1 and R 2 is a hydrogen atom, or an aromatic group which can be unsubstituted or substituted with one or more groups unreactive towards X; and R3 is an aromatic group which can be unsubstituted or substituted with one or more groups unreactive towards X.
Claim 2
Dependent Claim
86 words
A ballasted water-soluble optical brightener of the formula: ##STR15## wherein Polymer is a gelatin residue; M is a cation; X is a group capable of undergoing nucleophilic displacement; and Z is ##STR16## or --O--R 3 , where each of R 1 and R 2 is a hydrogen atom, or an aromatic group which can be unsubstituted or substituted with one or more groups unreactive towards X; and R3 is an aromatic group which can be unsubstituted or substituted with one or more groups unreactive towards X.
Claim 3
Dependent Claim
30 words
An optical brightener of claim 1 wherein the optical brightener is present in an amount of about 5% to about 20% by weight, based on the weight of the gelatin.
Claim 4
Dependent Claim
18 words
A photographic element comprising in at least one layer thereof, a ballasted optical brightener according to claim 1.
Claim 5
Dependent Claim
14 words
An optical brightener which has the formula: ##STR17## where Gel is a gelatin residue.
Claim 6
Dependent Claim
14 words
An optical brightener which has the formula: ##STR17## where Gel is a gelatin residue.
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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) | 1998-03-06 | 1998-09-05 | 1999-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-06 | 2002-09-05 | 2003-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-06 | 2006-09-05 | 2007-03-07 | $7700.00 | Window Closed / Lapsed |