US5611847A
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Aqueous pigment dispersions containing sequestering agents for use as ink jet printing inks
Assignee: Eastman Kodak Co
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Filing: 1994-12-08
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Granted: 1997-03-18
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Expires: 2014-12-08
Abstract
Abstract An ink composition for utilization in ink-jet printing is provided which comprises an aqueous medium, a metallized azo red pigment and, as a sequestering agent, an alkali metal, an alkaline earth metal or an ammonium salt of a linear aliphatic substituted glycine such as a salt of ethylene diamine tetraacetic acid or nitrilo triacetic acid. The composition has been found to remain stable for extended periods of time.
Inventors
- 👤 Robert A. Guistina
- 👤 Domenic Santilli
- 👤 Douglas E. Bugner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:27
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30; C09D11/32; C09D11/322
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
64 words
A stable ink jet ink having a viscosity from about 1 to about 10 centipoise and comprising a dispersant, from 1 to 20 wt/% of a metallized azo red pigment and 0.5 to 10 wt/% of a sequestering agent selected from the group consisting of an alkali metal, an alkaline earth metal or an ammonium salt of a linear aliphatic substituted glycine and water.
Claim 2
Dependent Claim
64 words
A stable ink jet ink having a viscosity from about 1 to about 10 centipoise and comprising a dispersant, from 1 to 20 wt/% of a metallized azo red pigment and 0.5 to 10 wt/% of a sequestering agent selected from the group consisting of an alkali metal, an alkaline earth metal or an ammonium salt of a linear aliphatic substituted glycine and water.
Claim 3
Dependent Claim
53 words
An ink jet ink according to claim 1, wherein the sequestering agent is selected from the group consisting of an alkali metal, an alkaline earth metal or an ammonium salt of ethylene diamine tetraacetic acid, nitrilo triacetic acid, diethylene triamine pentaacetic acid, hydroxyethylene diamine triacetic acid, dihydroxethyl glycine, iminodiacetic acid and ethanol diglycine.
Claim 4
Dependent Claim
21 words
An ink jet ink according to claim 2, wherein the sequestering agent is the tetrasodium salt of ethylene diamine tetraacetic acid.
Claim 5
Dependent Claim
33 words
An ink jet ink according to claim 2, wherein the sequestering agent is contained in an amount of from 1 to 5 percent by weight, based on the total weight of the composition.
Claim 6
Dependent Claim
143 words
An ink jet ink according to claim 1, wherein the metallized azo red pigment is represented by the structure: ##STR2## wherein A is CH 3 , B is Cl, R is COOH and M is barium; A is CH 3 , B is Cl, R is COOH and M is calcium; A is CH 3 , B is Cl, R is COOH and M is manganese; A is Cl, B is CH 3 , R is COOH and M is calcium; A is Cl, B is CH 3 , R is COOH and M is manganese; A is Cl, B is CH 3 , R is H and M is barium; A is Cl, B is C 2 H 5 , R is COOH, M is calcium; or A is CH 3 , B is H, R is COOH and M is calcium.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-03-17 | 2000-09-16 | 2001-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-03-17 | 2004-09-16 | 2005-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-03-17 | 2008-09-16 | 2009-03-18 | $7700.00 | Window Closed / Lapsed |