US5772744A
Expired / Lapsed
US
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Ink compositions for thermal ink printing
Assignee: Xerox Corp
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Filing: 1997-10-30
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Granted: 1998-06-30
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Expires: 2017-10-30
Abstract
Abstract Disclosed is an ink composition which comprises water, a colorant, betaine, a tertiary amine, and a material of the formula (F 2n+1 C n CH 2 S) 2 (CH 3 )C--CH 2 CH 2 COO - ! B + !, wherein n is an integer of from about 8 to about 20 and B is a cation. In one specific embodiment, n is 10 and B is (HO--CH 2 CH 2 ) 2 NH 3 + . In another specific embodiment, the tertiary amine is 1-methylimidazole. In yet another specific embodiment of the present invention, the colorant is an anionic dye with carboxylate groups, sulfonate groups, or both carboxylate and sulfonate groups. Also disclosed is a process for preparing the aforementioned ink composition wherein a liquid containing the material of the formula (F 2n+1 CnCH 2 S) 2 (CH 3 )C--CH 2 CH 2 COO - ! B + ! is subjected to centrifugation. Also disclosed are ink jet printing processes employing the aforementioned ink.
Inventors
- 👤 Kurt B. Gundlach
- 👤 Richard L. Colt
- 👤 Edward J. Radigan, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:51
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30; C09D11/38
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
55 words
An ink composition which comprises water, a colorant, betaine, a tertiary amine, and a material of the formula (F 2n+1 C n CH 2 S) 2 (CH 3 )C--CH 2 CH 2 COO - ! B + !, wherein n is an integer of from about 8 to about 20 and B is a cation.
Claim 2
Dependent Claim
55 words
An ink composition which comprises water, a colorant, betaine, a tertiary amine, and a material of the formula (F 2n+1 C n CH 2 S) 2 (CH 3 )C--CH 2 CH 2 COO - ! B + !, wherein n is an integer of from about 8 to about 20 and B is a cation.
Claim 3
Dependent Claim
11 words
An ink composition according to claim 1 wherein n is 10.
Claim 4
Dependent Claim
20 words
An ink composition according to claim 1 wherein B is (HO--CH 2 CH 2 ) 2 NH 2 + .
Claim 5
Dependent Claim
13 words
An ink composition according to claim 1 wherein the tertiary amine is 1-methylimidazole.
Claim 6
Dependent Claim
21 words
An ink composition according to claim 1 wherein the tertiary amine is triethanolamine, triethylamine, tris 2-(2-methoxyethoxy)ethyl!amine, imidazole, N-butyl imidazole, or diethanolamine.
Claim 7
Dependent Claim
34 words
An ink composition according to claim 1 wherein the colorant is selected from anionic dyes having carboxylate groups, anionic dyes having sulfonate groups, anionic dyes having both carboxylate and sulfonate groups, and mixtures thereof.
Claim 8
Dependent Claim
27 words
An ink composition according to claim 1 wherein betaine is present in an amount of from about 5 to about 25 percent by weight of the ink.
Claim 9
Dependent Claim
29 words
An ink composition according to claim 1 wherein the tertiary amine is present in an amount of from about 1 to about 25 percent by weight of the ink.
Claim 10
Dependent Claim
51 words
An ink composition according to claim 1 wherein the material of the formula (F 2n+1 C n CH 2 S) 2 (CH 3 )C--CH 2 CH 2 COO - ! B + ! is present in an amount of from about 0.1 to about 10 percent by weight of the ink.
Claim 11
Dependent Claim
111 words
A process for preparing an ink composition which comprises (a) providing a liquid composition containing a material of the formula (F 2n+1 C n CH 2 S) 2 (CH 3 )C--CH 2 CH 2 COO - ! B + !, wherein n is an integer of from about 8 to about 20 and B is a cation; (b) subjecting the liquid composition to centrifugation, thereby causing the composition to separate into a supernatant top layer and a flocculated bottom layer; (c) separating the supernatant top layer from the flocculated bottom layer; and (d) admixing the supernatant top layer with an aqueous liquid vehicle and a colorant, thereby forming an ink composition.
Claim 12
Dependent Claim
111 words
A process for preparing an ink composition which comprises (a) providing a liquid composition containing a material of the formula (F 2n+1 C n CH 2 S) 2 (CH 3 )C--CH 2 CH 2 COO - ! B + !, wherein n is an integer of from about 8 to about 20 and B is a cation; (b) subjecting the liquid composition to centrifugation, thereby causing the composition to separate into a supernatant top layer and a flocculated bottom layer; (c) separating the supernatant top layer from the flocculated bottom layer; and (d) admixing the supernatant top layer with an aqueous liquid vehicle and a colorant, thereby forming an ink composition.
Claim 13
Dependent Claim
22 words
A process according to claim 10 wherein centrifugation is carried out for a period of from about 10 to about 60 minutes.
Claim 14
Dependent Claim
22 words
A process according to claim 10 wherein centrifugation is at a speed of from about 1,000 to about 20,000 revolutions per minute.
Claim 15
Dependent Claim
50 words
A process according to claim 10 wherein the material of the formula (F 2n+1 C n CH 2 S) 2 (CH 3 )C--CH 2 CH 2 COO - ! B + ! is present in the liquid in an amount of from about 20 to about 50 percent by weight.
Claim 16
Dependent Claim
12 words
A process according to claim 10 wherein the liquid also contains water.
Claim 17
Dependent Claim
34 words
A process which entails incorporating an ink according to claim 1 into an ink jet printing apparatus and causing droplets of the ink composition to be ejected in an imagewise pattern onto a substrate.
Claim 18
Dependent Claim
41 words
A process according to claim 15 wherein the printing apparatus employs a thermal ink jet process wherein the ink in the nozzles is selectively heated in an imagewise pattern, thereby causing droplets of the ink to be ejected in imagewise pattern.
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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) | 2001-06-29 | 2001-12-29 | 2002-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-06-29 | 2005-12-29 | 2006-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-06-29 | 2009-12-29 | 2010-06-30 | $7700.00 | Window Closed / Lapsed |