US4783220A
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Vesicle ink compositions
Assignee: Nexstar Pharmaceuticals Inc
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Filing: 1986-12-18
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Granted: 1988-11-08
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Expires: 2006-12-18
Abstract
Abstract Ink compositions consisting of small unilamellar or multilamellar vesicles formed from surfactants of anionic, cationic, zwitterionic and nonionic molecules having an oil soluble dye, inclusive of a lipid-soluble dye associated therewith are described. The dye to surfactant ratio is preferably from about 1:1 to about 1:10. The compositions are useful in traditional printing techniques such as flexography and rotogravure and in electronic printing systems such as with an ink-jet printer.
Inventors
- 👤 Ronald C. Gamble
- 👤 Micheal C. Hair
- 👤 Sava R. Lukac
- 👤 Michael G. Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:20
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30; A; A61; A61K; A61K9/00; A61K9/10; A61K9/127; A61K9/1271; A61K9/1272; C09D11/02
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
38 words
An aqueous ink composition comprising a dye soluble in the hydrocarbon bilayer of vesicles formed from surfactants selected from the group consisting of anionic, cationic, zwitterionic and nonionic molecules having a polar group and two nonpolar hydrocarbon moieties.
Claim 2
Dependent Claim
38 words
An aqueous ink composition comprising a dye soluble in the hydrocarbon bilayer of vesicles formed from surfactants selected from the group consisting of anionic, cationic, zwitterionic and nonionic molecules having a polar group and two nonpolar hydrocarbon moieties.
Claim 3
Dependent Claim
13 words
The composition according to claim 1 wherein said vesicles are of dihexadecyl phosphate.
Claim 4
Dependent Claim
15 words
The composition according to claim 1 wherein said vesicles are of dioctadecyl dimethyl ammonium bromide.
Claim 5
Dependent Claim
12 words
The composition according to claim 1 wherein said vesicles are of phospholipid.
Claim 6
Dependent Claim
17 words
The composition according to claim 1 wherein said vesicles are of diacyl glycerides and their ethoxylated derivatives.
Claim 7
Dependent Claim
21 words
The composition according to claim 1 wherein said vesicles are in the range of approximately 40 to 800 nanometers in diameter.
Claim 8
Dependent Claim
17 words
The composition according to claim 6 wherein said vesicles are in the range of approximately 100-400 nanometers.
Claim 9
Dependent Claim
23 words
The composition according to claim 4 wherein the phospholipid vesicles consist of partially purified phospholipid in the range of 70 to 100% purity.
Claim 10
Dependent Claim
15 words
The composition according to claim 4 wherein the phospholipid vesicles consist essentially of soybean L-α-lecithin.
Claim 11
Dependent Claim
14 words
The composition according to claim 1 wherein the dye is an oil soluble dye.
Claim 12
Dependent Claim
16 words
The composition according to claim 10 wherein the oil soluble dye is a lipid soluble dye.
Claim 13
Dependent Claim
25 words
The composition according to claim 1 wherein the proportion of the lipid soluble dye to surfactant is from about 1:1 to about 1:10 by weight.
Claim 14
Dependent Claim
25 words
The composition according to claim 1 wherein the water comprises from about 70 percent to about 95 percent by weight of the total ink composition.
Claim 15
Dependent Claim
27 words
The composition according to claim 1 wherein the vesicles and dye comprise from about 5 percent to about 30 percent by weight of the total ink composition.
Claim 16
Dependent Claim
23 words
The composition according to claim 1 wherein the dye comprises from about 1.0 percent to about 10 percent by weight of the vesicles.
Claim 17
Dependent Claim
23 words
The composition according to claim 1 wherein the surfactant comprises from about 5% to about 30% by weight of the total ink composition.
Claim 18
Dependent Claim
23 words
The composition according to claim 1 wherein the surfactant comprises from about 5% to about 20% by weight of the total ink composition.
Claim 19
Dependent Claim
25 words
The composition according to claim 10 wherein the lipid soluble dye is selected from the group consisting of Sudan Black B, Giemsa stain and Pylakrome.
Claim 20
Independent Claim
86 words
A method for preparing an ink composition suitable for use in printing systems comprising the steps of: (a) suspending a surfactant and optionally, an antioxidant and a microbial inhibitor in water; (b) subjecting the suspension to a shear force sufficient to generate vesicles of desired size; (c) adding a lipid soluble dye to the sheared suspension; (d) adjusting the pH of the solution to enhance dye incorporation; (e) further subjecting said dye solution to shear force; and (f) centrifuging the sheared solution, thereby obtaining dye-associated vesicles.
Claim 21
Independent Claim
86 words
A method for preparing an ink composition suitable for use in printing systems comprising the steps of: (a) suspending a surfactant and optionally, an antioxidant and a microbial inhibitor in water; (b) subjecting the suspension to a shear force sufficient to generate vesicles of desired size; (c) adding a lipid soluble dye to the sheared suspension; (d) adjusting the pH of the solution to enhance dye incorporation; (e) further subjecting said dye solution to shear force; and (f) centrifuging the sheared solution, thereby obtaining dye-associated vesicles.
Claim 22
Dependent Claim
13 words
The method according to claim 19 wherein said vesicles are of dihexadecyl phosphate.
Claim 23
Dependent Claim
15 words
The method according to claim 19 wherein said vesicles are of dioctadecyl dimethyl ammonium bromide.
Claim 24
Dependent Claim
12 words
The method according to claim 19 wherein said vesicles are of phospholipid.
Claim 25
Dependent Claim
17 words
The method according to claim 19 wherein said vesicles are of diacyl glycerides and their ethoxylated derivatives.
Claim 26
Dependent Claim
17 words
The method according to claim 19 wherein said vesicles are approximately 40 to 800 nanometers in diameter.
Claim 27
Dependent Claim
17 words
The method according to claim 24 wherein said vesicles are approximately 100 to 400 nanometers in diameter.
Claim 28
Dependent Claim
16 words
The method according to claim 19 wherein said surfactants are anionic, cationic, zwitterionic or nonionic molecules.
Claim 29
Dependent Claim
21 words
The method according to claim 22 wherein the phospholipid is partially purified phospholipid in the range of 70 to 100% purity.
Claim 30
Dependent Claim
12 words
The method according to claim 27 wherein the phospholipid is soybean L-α-lecithin.
Claim 31
Dependent Claim
17 words
The method according to claim 19 wherein about 5.0 grams to about 10 grams surfactant are suspended.
Claim 32
Dependent Claim
25 words
The method according to claim 19 wherein the lipid soluble dye is selected from the group consisting of Sudan Black B, Giemsa stain and Pylakrome.
Claim 33
Dependent Claim
20 words
The method according to claim 19 wherein about 0.5 grams to about 5.0 grams of lipid soluble dye are added.
Claim 34
Dependent Claim
26 words
The method according to claim 19 wherein the final pH of the composition is adjusted to within the range of about pH 1.5 to about 3.
Claim 35
Dependent Claim
12 words
The method according to claim 19 wherein the antioxidant is L-ascorbic acid.
Claim 36
Dependent Claim
22 words
The method according to claim 19 wherein the antioxidant is present in the amount of about 0% to about 0.4% by weight.
Claim 37
Dependent Claim
14 words
The method according to claim 19 wherein the microbial inhibiting compound is sodium azide.
Claim 38
Dependent Claim
22 words
The method according to claim 19 wherein the microbial inhibiting compound is present in the amount from about 0% to about 0.05%.
Claim 39
Dependent Claim
48 words
The composition of claim 16 in which said vesicles are approximately 40 to about 800 nanometers in diameter and said composition comprises from about 1.0 percent to about 10 percent of said dye and about 70 to about 95 percent water based on the weight of said vesicles.
Claim 40
Dependent Claim
18 words
The composition of claim 37 in which said vesicles are of phospholipid of 70 to 100 percent purity.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1991-11-08 | 1992-05-09 | 1992-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-08 | 1996-05-09 | 1996-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-08 | 2000-05-09 | 2000-11-08 | $7700.00 | Window Closed / Lapsed |