Patent US5679138A successfully refreshed from Google Patents.
US5679138A
Expired / Lapsed
US
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Ink jet inks containing nanoparticles of organic pigments
Assignee: Eastman Kodak Co
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Filing: 1995-11-30
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Granted: 1997-10-21
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Expires: 2015-11-30
Abstract
Abstract A process for making ink jet inks, comprising the steps of: (A) providing an organic pigment dispersion containing a pigment, a carrier for the pigment and a dispersant; (B) mixing the pigment dispersion with rigid milling media having an average particle size less than 100 mu m; (C) introducing the mixture of step (B) into a high speed mill; (D) milling the mixture from step (C) until a pigment particle size distribution is obtained wherein 90% by weight of the pigment particles have a size less than 100 nanometers (nm); (E) separating the milling media from the mixture milled in step (D); and (F) diluting the mixture from step (E) to obtain an ink jet ink having a pigment concentration suitable for ink jet printers.
Inventors
- 👤 John F. Bishop
- 👤 David Alan Czekai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:35
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30; C09D11/32; C09D11/322
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
124 words
A process for making ink jet inks, comprising the steps of: (A) providing an organic pigment dispersion containing a pigment, a carrier for the pigment and a dispersant; (B) mixing the pigment dispersion with rigid milling media having an average particle size less than 100 μm; (C) introducing the mixture of step (B) into a high speed mill; (D) milling the mixture from step (C) until a pigment particle size distribution is obtained wherein 90% by weight of the pigment particles have a size less than 100 nanometers (nm); (E) separating the milling media from the mixture milled in step (D); and (F) diluting the mixture from step (E) to obtain an ink jet ink having a pigment concentration suitable for ink jet printers.
Claim 2
Dependent Claim
124 words
A process for making ink jet inks, comprising the steps of: (A) providing an organic pigment dispersion containing a pigment, a carrier for the pigment and a dispersant; (B) mixing the pigment dispersion with rigid milling media having an average particle size less than 100 μm; (C) introducing the mixture of step (B) into a high speed mill; (D) milling the mixture from step (C) until a pigment particle size distribution is obtained wherein 90% by weight of the pigment particles have a size less than 100 nanometers (nm); (E) separating the milling media from the mixture milled in step (D); and (F) diluting the mixture from step (E) to obtain an ink jet ink having a pigment concentration suitable for ink jet printers.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein the rigid milling media is polymeric milling media having an average diameter of 50 μm.
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein the dispersant is a polymeric dispersant.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein the dispersant is sodium N-methyl-N-oleoyl taurate.
Claim 6
Dependent Claim
10 words
The process of claim 1 wherein the carrier is water.
Claim 7
Dependent Claim
11 words
The process of claim 5 wherein the carrier is de-ionized water.
Claim 8
Dependent Claim
29 words
The process of claim 1 wherein step (D) is carried out until 90% by weight of the pigments in the mixture have a particle size less than 50 nm.
Claim 9
Dependent Claim
56 words
The process of claim 1 wherein step (D) is carried out until by weight of pigments in the mixture have a particle size less than 15 nm; 50% by weight of said pigments have a particle size less than 25 nm and 90% by weight of said pigments have a particle size less than 50 nm.
Claim 10
Dependent Claim
34 words
The process of claims 7 or 8 wherein the organic pigment is selected from the group consisting of cyan, magenta, yellow, and black pigments or any mixture of two or more of such pigments.
Claim 11
Dependent Claim
29 words
An ink jet ink comprising organic pigment particles having a particle size of wherein 90% by weight of the pigment particles have a size less than 100 nanometers (nm).
Claim 12
Dependent Claim
29 words
An ink jet ink comprising organic pigment particles having a particle size of wherein 90% by weight of the pigment particles have a size less than 100 nanometers (nm).
Claim 13
Dependent Claim
61 words
An ink jet ink according to claim 10 having a surface tension in the range of 30 to 50 dynes/cm, a viscosity in the range of 1 to 5 centipoise, a pH in the range of 5 to 9 and a total trace metal contamination concentration of less than 100 parts per million of ink containing 2.5% by weight of pigment.
Claim 14
Dependent Claim
23 words
The ink of claim 10 wherein 90% by weight of the pigments in the ink have a particle size less than 50 nm.
Claim 15
Dependent Claim
70 words
An ink jet printing method, comprising the steps of: providing an ink jet printer that is responsive to digital data signals; loading the printer with ink receptive substrates; loading the printer with an ink jet ink comprising organic pigment particles wherein 90% by weight of the pigment particles have a size less than 100 nanometers (nm); and printing on an ink receptive element in response to the digital data signals.
Claim 16
Dependent Claim
70 words
An ink jet printing method, comprising the steps of: providing an ink jet printer that is responsive to digital data signals; loading the printer with ink receptive substrates; loading the printer with an ink jet ink comprising organic pigment particles wherein 90% by weight of the pigment particles have a size less than 100 nanometers (nm); and printing on an ink receptive element in response to the digital data signals.
Claim 17
Dependent Claim
63 words
The method of claim 13 wherein the ink jet ink has a surface tension in the range of 30 to 50 dynes/cm, a viscosity in the range of 1 to 5 centipoise, a pH in the range of 5 to 9 and a total trace metal contamination concentration of less than 100 parts per million of ink containing 2.5% by weight of pigment.
Claim 18
Dependent Claim
23 words
The method of claim 13 wherein 90% by weight of the pigments in the ink have a particle size less than 50 nm.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2000-10-20 | 2001-04-21 | 2001-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-10-20 | 2005-04-21 | 2005-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-10-20 | 2009-04-21 | 2009-10-21 | $7700.00 | Window Closed / Lapsed |