US5015564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilizatin of precipitated dispersions of hydrophobic couplers, surfactants and polymers
Assignee: Eastman Kodak Co
•
Filing: 1990-06-01
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Granted: 1991-05-14
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Expires: 2010-06-01
Abstract
Abstract The invention provides stable dispersions of couplers and methods of their formation. The stable dispersions are formed by the use of a nonionic water soluble polymer in combination with an anionic surfactant having a sulfate or sulfonate head group and a hydrophobic group of 8 to 20 carbons. The preferred nonionic water soluble polymers are polyethyleneoxide and polyvinylpyrrolidene.
Inventors
- 👤 Krishnan Chari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:54
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/3212; G03C7/388; G03C7/3882; Y; Y10; Y10S; Y10S516/00; Y10S516/01
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
68 words
A dispersion comprising water, and particles, said particles consisting essentially of a coupler having a ballast group comprising a straight chain hydrocarbon of up to 15 carbon atoms, a surfactant comprising a head group of sulfate or sulfonate and having no oxyethylene groups, and a nonionic water soluble polymer that is attracted to said surfactant with the proviso that said dispersion does not precipitate after three weeks' storage.
Claim 2
Dependent Claim
68 words
A dispersion comprising water, and particles, said particles consisting essentially of a coupler having a ballast group comprising a straight chain hydrocarbon of up to 15 carbon atoms, a surfactant comprising a head group of sulfate or sulfonate and having no oxyethylene groups, and a nonionic water soluble polymer that is attracted to said surfactant with the proviso that said dispersion does not precipitate after three weeks' storage.
Claim 3
Dependent Claim
18 words
The dispersion of claim 1 wherein said coupler comprises a member selected from the group consisting of: ##STR7##
Claim 4
Dependent Claim
8 words
The dispersion of claim 1 further comprising gelatin.
Claim 5
Dependent Claim
12 words
The dispersion of claim 1 wherein said water soluble polymer comprises polyvinylpyrrolidone.
Claim 6
Dependent Claim
53 words
The dispersion of claim 4 wherein said surfactant has a tail group that comprises a hydrophobic group of 8 to 20 carbons, said surfactant does not have oxyethylene groups, and wherein said sulfate or sulfonate may be represented as an SO 3 M or OSO 3 M moiety where M represents a cation.
Claim 7
Dependent Claim
22 words
The dispersion of claim 1 wherein the median particle size of said coupler particles is between about 8 and about 300 nm.
Claim 8
Dependent Claim
9 words
The dispersion of claim 5 wherein M represents sodium.
Claim 9
Dependent Claim
30 words
The dispersion of claim 5 wherein said coupler has the structure ##STR8## wherein ##STR9## is a ballast group, and R is a hydrocarbon chain of 2 to 15 carbon atoms.
Claim 10
Dependent Claim
18 words
The dispersion of claim 8 wherein R is an unsubstituted alkyl group of 2 to 15 carbon atoms.
Claim 11
Dependent Claim
46 words
The dispersion of claim 9 wherein said ballast group is joined to a non-coupling position of said coupler moiety and has a structure selected from the group consisting of ##STR10## where R is an alkyl of 2 to 15 carbons and n is 1 or 2.
Claim 12
Dependent Claim
12 words
The dispersion of claim 6 wherein said water soluble polymer comprises polyvinylpyrrolidone.
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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) | 1994-05-13 | 1994-11-12 | 1995-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-13 | 1998-11-12 | 1999-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-13 | 2002-11-12 | 2003-05-14 | $7700.00 | Window Closed / Lapsed |