US5512089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making aqueous pigmented ink-jet ink with improved machine runnability
Assignee: Eastman Kodak Co
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Filing: 1994-08-23
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Granted: 1996-04-30
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Expires: 2014-08-23
Abstract
Abstract An ink jet ink composition comprises a liquid vehicle, a pigment, and a base for raising the pH of the system. The problem to be addressed for pigmented inks is how to achieve excellent ink redispersibility within a short time period, usually within 1-2 minutes, without any mechanical agitation. With the present invention, dried ink redispersibility/charge plate deposit redispersibility of aqueous pigmented ink is improved by raising the pH of the ink, for example, between 9 and 12. The time required for dried ink redispersibility is then reduced from greater than 10 minutes to an acceptable 1-2 minutes. The present invention results in significant improvement in machine runnability and can, therefore, be used in ink jet printers.
Inventors
- 👤 Sharad R. Thakkar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:43
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30; C09D11/32; C09D11/322
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
31 words
An ink jet ink composition for use in a continuous ink jet printing system comprising a liquid vehicle, a pigment, and a base for raising pH to redisperse dried ink film.
Claim 2
Dependent Claim
31 words
An ink jet ink composition for use in a continuous ink jet printing system comprising a liquid vehicle, a pigment, and a base for raising pH to redisperse dried ink film.
Claim 3
Dependent Claim
23 words
An ink jet ink composition as claimed in claim 1 wherein the pigment is dispersed in an aqueous medium using a polymeric surfactant.
Claim 4
Dependent Claim
16 words
An ink jet ink composition as claimed in claim 1 wherein the pigment comprises carbon black.
Claim 5
Dependent Claim
27 words
An ink jet ink composition as claimed in claim 1 wherein the pigment is present in an amount of from about 1% to about 20% by weight.
Claim 6
Dependent Claim
23 words
An ink jet ink composition as claimed in claim 1 wherein the pigment has an average particle size of less than 0.5 microns.
Claim 7
Dependent Claim
42 words
A process for generating images which comprises incorporating into an ink jet printing apparatus the ink composition of claim 1 and forming images by causing the ink to be expelled in droplets onto a substrate, thereby generating an image on the substrate.
Claim 8
Dependent Claim
22 words
A process as claimed in claim 6 wherein the ink contains a pigment dispersed in an aqueous medium using a polymeric surfactant.
Claim 9
Dependent Claim
13 words
A process as claimed in claim 6 wherein the pigment is carbon black.
Claim 10
Dependent Claim
23 words
A process as claimed in claim 6 wherein the pigment is present in an amount of from about 1% to 20% by weight.
Claim 11
Dependent Claim
30 words
An ink jet composition as claimed in claim 1 wherein the liquid vehicle is selected from the group consisting of a wetting agent, a biocide, deionized water, and mixtures thereof.
Claim 12
Dependent Claim
39 words
An ink jet composition as claimed in claim 10 wherein the liquid vehicle is selected from the group consisting of a wetting agent, a biocide, a corrosion inhibitor, a glycol, a water miscible cosolvent, deionized water and mixtures thereof.
Claim 13
Independent Claim
61 words
A method for formulating modified inks for continuous ink jet printers, the method comprising the steps of: mixing a polymeric surfactant, water, and a carbon dispersion to create a carbon dispersion mixture; mixing a base with the carbon dispersion mixture to create a base mixture; adding a conventional humectant to the base mixture to make an aqueous pigmented ink jet ink.
Claim 14
Independent Claim
61 words
A method for formulating modified inks for continuous ink jet printers, the method comprising the steps of: mixing a polymeric surfactant, water, and a carbon dispersion to create a carbon dispersion mixture; mixing a base with the carbon dispersion mixture to create a base mixture; adding a conventional humectant to the base mixture to make an aqueous pigmented ink jet ink.
Claim 15
Dependent Claim
13 words
A method as claimed in claim 12 wherein the base comprises an amine.
Claim 16
Dependent Claim
24 words
A method as claimed in claim 12 wherein the pigment is present in an amount of from about 1% to about 20% by weight.
Claim 17
Dependent Claim
20 words
A method as claimed in claim 12 wherein the pigment has an average particle size of less than 0.5 microns.
Claim 18
Dependent Claim
18 words
A method as claimed in claim 12 wherein the polymeric surfactant comprises homopolymer or a copolymer of acrylates.
Claim 19
Dependent Claim
14 words
A method as claimed in claim 12 wherein the conventional humectant comprises polypropylene glycol.
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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) | 1999-04-30 | 1999-10-30 | 2000-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-30 | 2003-10-30 | 2004-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-30 | 2007-10-30 | 2008-04-30 | $7700.00 | Window Closed / Lapsed |