US5468598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid particle dispersions for imaging systems
Assignee: Eastman Kodak Co
•
Filing: 1994-04-18
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Granted: 1995-11-21
•
Expires: 2014-04-18
Abstract
Abstract A process for preparing a stable, solid particle dispersion of a substantially water-insoluble compound useful in imaging, comprises the steps of: (a) forming a coarse aqueous slurry of solid particles of said compound and a hydrophobic, water-soluble or water-dispersible polymer in an amount of 0.1 to 100% by weight based on the weight of said compound; and (b) milling said slurry for time sufficient to provide particles of the desired average particle size; wherein the polymer is an uncharged or weakly anionically charged water-soluble or water-dispersible homopolymer or copolymer in which at least 10 mole % of the repeat units contain an uncharged pendant group that terminates in (a) a CH3 unit, (b) a ring containing at least two contiguous CH2 units, or (c) an aromatic group. The resulting dispersion has dispersed solid particles of said compound having the desired small particle size and is stable toward particle agglomeration, particle growth and needle growth.
Inventors
- 👤 David D. Miller
- 👤 Mary C. Brick
- 👤 Mridula Nair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:52
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/388; G03C7/3882; C; C09; C09B; C09B67/00; C09B67/0071; C09B67/0084; C09B67/0085; G03C1/00; G03C1/005
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
139 words
A process for preparing a stable, solid particle dispersion of a substantially water-insoluble compound useful in imaging selected from the group consisting of filter dyes and thermal transfer dyes, comprising the steps of: (a) forming a coarse aqueous slurry of solid particles of said compound and a hydrophobic, water-soluble polymer in an amount of 0.1 to 100%, by weight based on the weight of said compound; and (b) milling said slurry for time sufficient to provide particles of the desired average particle size; wherein the polymer is an uncharged or weakly anionically charged water-soluble or water-dispersible homopolymer or copolymer in which at least 10 mole % of the repeat units contain an uncharged pendant group that terminates in (a) a CH 3 unit, (b) a ring containing at least two contiguous CH 2 units, or (c) an aromatic group.
Claim 2
Dependent Claim
139 words
A process for preparing a stable, solid particle dispersion of a substantially water-insoluble compound useful in imaging selected from the group consisting of filter dyes and thermal transfer dyes, comprising the steps of: (a) forming a coarse aqueous slurry of solid particles of said compound and a hydrophobic, water-soluble polymer in an amount of 0.1 to 100%, by weight based on the weight of said compound; and (b) milling said slurry for time sufficient to provide particles of the desired average particle size; wherein the polymer is an uncharged or weakly anionically charged water-soluble or water-dispersible homopolymer or copolymer in which at least 10 mole % of the repeat units contain an uncharged pendant group that terminates in (a) a CH 3 unit, (b) a ring containing at least two contiguous CH 2 units, or (c) an aromatic group.
Claim 3
Dependent Claim
16 words
A process in accordance with claim 1, wherein the polymer comprises a vinyl pyrrolidone repeating unit.
Claim 4
Dependent Claim
19 words
A process of claim 1, wherein at least one low molecular weight anionic surfactant is added to the slurry.
Claim 5
Dependent Claim
27 words
A process of claim 1, where the amount of the hydrophobic, water-soluble or water-dispersible polymer is 0.5 to 20% by weight of the compound useful in imaging.
Claim 6
Dependent Claim
28 words
A process of claim 1, which further comprises the step of adding an additional component selected from the group consisting of surfactants, binders and polymers to the dispersion.
Claim 7
Dependent Claim
14 words
A process of claim 5, wherein the component is added after the milling step.
Claim 8
Dependent Claim
29 words
A process of claim 1, wherein an aqueous dispersion of another photographically useful compound dispersed as a solution in an organic solvent is added to the solid particle dispersion.
Claim 9
Dependent Claim
18 words
A process of claim 1 wherein the compound is a filter dye that is uncharged or weakly anionic.
Claim 10
Dependent Claim
19 words
A process of claim 1 wherein the compound is a thermal transfer dye that is uncharged or weakly anionic.
Claim 11
Dependent Claim
9 words
A product produced by the process of claim 1.
Claim 12
Dependent Claim
9 words
A product produced by the process of claim 5.
Claim 13
Dependent Claim
9 words
A product produced by the process of claim 7.
Claim 14
Dependent Claim
13 words
A photographic element comprising a dispersion produced by the process of claim 1.
Claim 15
Dependent Claim
13 words
A photographic element comprising a dispersion produced by the process of claim 5.
Claim 16
Dependent Claim
13 words
A photographic element comprising a dispersion produced by the process of claim 7.
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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) | 1998-11-20 | 1999-05-22 | 1999-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-11-20 | 2003-05-22 | 2003-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-11-20 | 2007-05-22 | 2007-11-21 | $7700.00 | Window Closed / Lapsed |