US5657931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stable aqueous solid particle dispersions
Assignee: Eastman Kodak Co
•
Filing: 1995-05-19
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Granted: 1997-08-19
•
Expires: 2015-05-19
Abstract
Abstract A fine solid particle aqueous dispersion comprises dispersed particles of a substantially water insoluble nonpolymeric organic compound useful in imaging and a polymeric dispersant having an HLB number of at least 8. The dispersion can be prepared by (a) forming a coarse aqueous slurry of solid particles of said compound and a polymeric dispersant having an HLB number of at least 8; and (b) milling said slurry for a period of time sufficient to provide particles of the desired particle size of less than 0.5 micron.
Inventors
- 👤 Mridula Nair
- 👤 Mary Christine Brick
- 👤 Lloyd Anthony Lobo
- 👤 Gary Norman Barber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:09
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/38; C; C09; C09B; C09B67/00; C09B67/0001; C09B67/0022; C09B67/0071; C09B67/0084; G03C7/00; G03C7/30; G03C7/388; G03C7/3882; G03C1/74; G03C2001/7448; G03C2200/00; G03C2200/47
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
90 words
A process for the preparation of a fine solid particle aqueous dispersion of a substantially water-insoluble nonpolymeric organic compound useful in imaging selected from filter dyes, sensitizing dyes, and thermal transfer dyes, which comprises the steps of: (a) forming a coarse aqueous slurry of solid particles of said compound and an amphipathic water-soluble or water-dispersible block polymeric dispersant having an HLB number of at least 8; and (b) milling said slurry for a period of time sufficient to provide particles of the desired particle size of less than 0.5 micron.
Claim 2
Dependent Claim
90 words
A process for the preparation of a fine solid particle aqueous dispersion of a substantially water-insoluble nonpolymeric organic compound useful in imaging selected from filter dyes, sensitizing dyes, and thermal transfer dyes, which comprises the steps of: (a) forming a coarse aqueous slurry of solid particles of said compound and an amphipathic water-soluble or water-dispersible block polymeric dispersant having an HLB number of at least 8; and (b) milling said slurry for a period of time sufficient to provide particles of the desired particle size of less than 0.5 micron.
Claim 3
Dependent Claim
24 words
A process of claim 1 which further comprises the step of adding a small molecule surfactant to the slurry prior to the milling step.
Claim 4
Dependent Claim
15 words
A process of claim 2, wherein said small molecule surfactant is sodium dodecyl diphenyloxide disulfonate.
Claim 5
Dependent Claim
19 words
A process of claim 1, wherein a small molecule surfactant is added to the dispersion after the milling step.
Claim 6
Dependent Claim
15 words
A process of claim 4, wherein said small molecule surfactant is sodium dodecyl diphenyloxide disulfonate.
Claim 7
Dependent Claim
110 words
A process of claim 1 wherein the dispersant is selected from the group of amphipathic water-soluble or water-dispersible polymers represented by one of the following structures: ##STR7## wherein each A independently represents 1 to about 150 repeat units of a water soluble component; B and C each represent a linear or branched alkyl, aryl, alkaryl or cyclic alkyl radical containing at least 7 carbon atoms, or 3 to about 100 repeat units of a propylene oxide or higher alkylene oxide or combinations thereof; Q represents a multivalent linking group; m=50-100 mole % and n=1-50 mole %; with the proviso that m+n=100 mole %, x=1 or 2 and z=1 or 2.
Claim 8
Dependent Claim
13 words
A process of claim 1, wherein the dispersant is of the formula: ##STR8##
Claim 9
Dependent Claim
12 words
A process of claim 6, wherein the dispersant is a polyalkoxylated hydrocarbon.
Claim 10
Dependent Claim
18 words
A process of claim 6, wherein the dispersant is a partial ester of a branched carboxylic acid copolymer.
Claim 11
Dependent Claim
18 words
A process of claim 6, wherein the dispersant is a block copolymer of polyethylene oxide and polypropylene oxide.
Claim 12
Dependent Claim
25 words
A process of claim 6, wherein each A repeat unit is selected from poly(ethylene oxide) units, polyethyloxazoline units, poly(vinyl alcohol) units, and poly(vinyl pyrrolidone) units.
Claim 13
Dependent Claim
18 words
A process of claim 6, wherein each A independently represents 1 to about 150 repeat poly(ethylene oxide) units.
Claim 14
Dependent Claim
30 words
A process of claim 1, wherein said slurry comprises from about 5 to about 75 wt. % of said dispersant based upon the weight of the compound useful in imaging.
Claim 15
Dependent Claim
15 words
A process of claim 1, wherein said compound useful in imaging is a filter dye.
Claim 16
Dependent Claim
18 words
A process of claim 14, wherein the dispersant is a block copolymer of polyethylene oxide and polypropylene oxide.
Claim 17
Dependent Claim
30 words
A process of claim 15, wherein said slurry comprises from about 5 to about 75 wt % of said dispersant based upon the weight of the compound useful in imaging.
Claim 18
Dependent Claim
12 words
A process of claim 1, wherein said dye has the formula: ##STR9##
Claim 19
Dependent Claim
18 words
A process of claim 1, wherein the dispersant is a block copolymer of polyethylene oxide and polypropylene oxide.
Claim 20
Dependent Claim
30 words
A process of claim 18, wherein said slurry comprises from about 5 to about 75 wt % of said dispersant based upon the weight of the compound useful in imaging.
Claim 21
Dependent Claim
18 words
A process of claim 1, wherein the dispersant is a partial ester of a branched carboxylic acid copolymer.
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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) | 2000-08-18 | 2001-02-17 | 2001-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-08-18 | 2005-02-17 | 2005-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-08-18 | 2009-02-17 | 2009-08-19 | $7700.00 | Window Closed / Lapsed |