US5279931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer co-precipitated coupler dispersion
Assignee: Eastman Kodak Co
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Filing: 1991-04-26
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Granted: 1994-01-18
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Expires: 2011-04-26
Abstract
Abstract This invention describes a process of coprecipitating a photographic material such as a dye-forming coupler inside a base ionizable polymeric particle. Preparation of such a dispersion is performed by providing a first flow comprising a solution of a surfactant in water containing a polymer ionizable by base, providing a second flow comprising a water miscible solvent, base, water, and the photographic material, then mixing the said first and said second flow and immediately neutralizing the mixed flow to precipitate the photographic material inside the polymer particles forming a fine particle colloidal dispersion of the photographic material. The polymer dispersions of the invention are characterized by high photographic activity and high dye-stability in some cases.
Inventors
- 👤 Pranab Bagchi
- 👤 Steven J. Sargeant
- 👤 James T. Beck
- 👤 Brian Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:17
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/388; Y; Y10; Y10S; Y10S516/00; Y10S516/01
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
42 words
A composition comprising particles consisting of a hydrophobic photographic component that can be solubilized by base and solvent, surfactant, and a base ionizable latex polymer said latex polymer has a glass transition temperature less than 50° C., and is swellable by base.
Claim 2
Dependent Claim
42 words
A composition comprising particles consisting of a hydrophobic photographic component that can be solubilized by base and solvent, surfactant, and a base ionizable latex polymer said latex polymer has a glass transition temperature less than 50° C., and is swellable by base.
Claim 3
Dependent Claim
25 words
The composition of claim 1 wherein said polymer contains at least 5% by weight of monomer that comprise at least one pendent carboxylic acid group.
Claim 4
Dependent Claim
17 words
The composition of claim 1 wherein the polymer contains at least 5% by weight of methacrylic acid.
Claim 5
Dependent Claim
23 words
The composition of claim 1 wherein the polymer is poly(butylacrylate-co-methacrylic acid) in the weight ratio between 70% and 30% to 95% to 5%.
Claim 6
Dependent Claim
31 words
The composition of claim 1 wherein said photographic component consists of at least one member selected from the group comprising dye-forming coupler, UV absorbers, reducing agents, nucleators, boosters, and developing agents.
Claim 7
Dependent Claim
24 words
The composition of claim 1 wherein said photographic component consists of a dye-forming coupler material selected for at least one of the following: ##STR25##
Claim 8
Dependent Claim
14 words
The composition of claim 6 wherein said surfactant comprises at least one of: ##STR26##
Claim 9
Dependent Claim
185 words
The composition of claim 6 wherein said surfactant comprises at least one of the following classes: Class I--Surfactants with single, double, or triple C 5 to C 25 hydrocarbon chain terminated with one or more charged head groups and optionally provide with polymeric or oligomeric steric stabilizers comprising water soluble polymers and block oligomeric compounds comprising hydrophobic polyoxypropylene blocks (A) and hydrophilic polyoxyethylene blocks (B) joined in the manner of A--B--A, B--A--B, A--B, (A--B) n .tbd.G.tbd.(B--A) n , or (B--A) n .tbd.G.tbd.(A--B) n , where G is a connective organic moiety and n is between 1 and 3 Class II--Surfactants comprising between 6 to 22 carbon atom hydrophobic tail with one or more attached hydrophilic chains comprising at least four oxyethylene and/or glycidyl ether groups that may or may not be terminated with a negative charge such as a sulfate group, and Class III--Sugar surfactants, comprising between one and three 6 to 22 carbon atom hydrophobic tail with one or more attached hydrophilic mono or oligosaccharidic hydrophilic chains that may or may not be terminated by a negatively charged group such as a sulfate group.
Claim 10
Dependent Claim
14 words
The composition of claim 1 wherein said surfactant comprises at least one of ##STR27##
Claim 11
Dependent Claim
38 words
The composition of claim 1 wherein said photographic component consists of at least one member selected from the group of color dye-forming couplers, development inhibitor release couplers, development inhibitors, filter dyes, UV-absorbing dyes, development boosters, and development modifiers.
Claim 12
Dependent Claim
23 words
The composition of claim 7 wherein the polymer is poly(butylacrylate-co-methacrylic acid) in the weight ratio between 70% and 30% to 95% to 5%.
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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) | 1997-01-17 | 1997-07-19 | 1998-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-17 | 2001-07-19 | 2002-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-17 | 2005-07-19 | 2006-01-18 | $7700.00 | Window Closed / Lapsed |