US5395748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ballasted optical brighteners
Assignee: Eastman Kodak Co
•
Filing: 1993-12-08
•
Granted: 1995-03-07
•
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 15:59
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.
References Cited (Backward Citations)
US3181949A
Cited
US3749707A
Cited
US3462388A
Cited
US3580720A
Cited
US3677762A
Cited
US3666680A
Cited
US4115124A
Cited
US4072624A
Cited
US4203716A
Cited
US4302579A
Cited
US4526853A
Cited
US4943519A
Cited
US4855219A
Cited
US4920004A
Cited
JPH0362029A
Cited
US5055379A
Cited
US5026632A
Cited
US5066572A
Cited
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 |