US5169437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water based ink compositions exhibiting reduced crusting, clogging and kogation
Assignee: HP Inc
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Filing: 1991-10-24
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Granted: 1992-12-08
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Expires: 2011-10-24
Abstract
Abstract Disclosed herein are aqueous ink compositions containing a specific humectant or a mixture of such humectants. The use of such humectants in aqueous ink compositions greatly mitigates the problems arising with the crusting and clogging of orifice plates in thermal ink jet printers associated with aqueous ink compositions not employing a humectant. Additionally, the use of such humectants in aqueous ink compositions greatly mitigates the kogation problems arising in thermal ink-jet printers from humectants heretofore employed in aqueous ink compositions.
Inventors
- 👤 Young S. You
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:50
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
84 words
An aqueous ink composition suitable for use in a thermal ink-jet printer which consists essentially of water, a compatible colorant, and from about 5 to about 20 weight percent of a compound of the formula I: ##STR6## wherein R, R' and R" are independently selected from the group consisting of hydrogen and methyl and x, y and z are integers equal to at least 1 with the sum of x+y+z being an integer from about 6 to about 30, and mixtures of such compounds.
Claim 2
Dependent Claim
84 words
An aqueous ink composition suitable for use in a thermal ink-jet printer which consists essentially of water, a compatible colorant, and from about 5 to about 20 weight percent of a compound of the formula I: ##STR6## wherein R, R' and R" are independently selected from the group consisting of hydrogen and methyl and x, y and z are integers equal to at least 1 with the sum of x+y+z being an integer from about 6 to about 30, and mixtures of such compounds.
Claim 3
Dependent Claim
27 words
A composition according to claim 1 wherein R, R' and R" are hydrogen and the sum of x+y+z being an integer equal to 7 or to 26.
Claim 4
Dependent Claim
39 words
A composition according to claim 1 wherein the ink composition has a viscosity at 25° C. of from about 2 to about 20 centipoise and a surface tension at 25° C. of greater than about 40 dynes per centimeter.
Claim 5
Independent Claim
109 words
A method for reducing the rate of evaporation of an aqueous ink composition consisting essentially of water, a humectant and a compatible colorant which method comprises: (a) selecting a humectant from a compound of the formula I: ##STR7## wherein R, R' and R" are independently selected from the group consisting of hydrogen and methyl and x, y and z are integers equal to at least 1 with the sum of x+y+z being an integer from about 6 to about 30; and (b) adding from about 5 to about 20 weight percent of the humectant selected in (a) above to an aqueous ink composition comprising water and a compatible colorant.
Claim 6
Independent Claim
109 words
A method for reducing the rate of evaporation of an aqueous ink composition consisting essentially of water, a humectant and a compatible colorant which method comprises: (a) selecting a humectant from a compound of the formula I: ##STR7## wherein R, R' and R" are independently selected from the group consisting of hydrogen and methyl and x, y and z are integers equal to at least 1 with the sum of x+y+z being an integer from about 6 to about 30; and (b) adding from about 5 to about 20 weight percent of the humectant selected in (a) above to an aqueous ink composition comprising water and a compatible colorant.
Claim 7
Dependent Claim
25 words
A method according to claim 4 wherein R, R' and R" are hydrogen and the sum of x+y+z is equal to 7 or to 26.
Claim 8
Dependent Claim
39 words
A method according to claim 4 wherein the ink composition has a viscosity at 25° C. of from about 2 to about 20 centipoise and a surface tension at 25° C. of greater than about 40 dynes per centimeter.
Claim 9
Independent Claim
140 words
A method for reducing kogation in a thermal ink-jet printer using an ink composition comprising water, a compatible colorant and a humectant wherein kogation arises from the thermal decomposition of the humectant which method comprises: (a) selecting a humectant from the group consisting of trimethylol propane and a compound of the formula I: ##STR8## wherein R, R' and R" are independently selected from the group consisting of hydrogen and methyl and x, y and z are integers equal to at least 1 with the sum of x+y+z being an integer from about 6 to about 30; (b) adding from about 5 to about 20 weight percent of the humectant selected in (a) above to an aqueous ink composition comprising water and a compatible colorant; and (c) using the aqueous ink composition produced in step (b) in a thermal ink-jet printer.
Claim 10
Independent Claim
140 words
A method for reducing kogation in a thermal ink-jet printer using an ink composition comprising water, a compatible colorant and a humectant wherein kogation arises from the thermal decomposition of the humectant which method comprises: (a) selecting a humectant from the group consisting of trimethylol propane and a compound of the formula I: ##STR8## wherein R, R' and R" are independently selected from the group consisting of hydrogen and methyl and x, y and z are integers equal to at least 1 with the sum of x+y+z being an integer from about 6 to about 30; (b) adding from about 5 to about 20 weight percent of the humectant selected in (a) above to an aqueous ink composition comprising water and a compatible colorant; and (c) using the aqueous ink composition produced in step (b) in a thermal ink-jet printer.
Claim 11
Dependent Claim
15 words
A method according to claim 7 wherein the humectant is a compound of Formula I.
Claim 12
Dependent Claim
25 words
A method according to claim 8 wherein R, R' and R" are hydrogen and the sum of x+y+z is equal to 7 or to 26.
Claim 13
Dependent Claim
12 words
A method according to claim 7 wherein the humectant is trimethylol propane.
Claim 14
Dependent Claim
43 words
A method according to claim 7 wherein the ink composition produced in step (b) has a viscosity at 25° C. of from about 2 to about 20 centipoise and a surface tension at 25° C. of greater than about 40 dynes per centimeter.
Claim 15
Dependent Claim
85 words
An aqueous ink composition comprising water, a compatible colorant, and from about 5 to about 20 weight percent of a humectant of the formula: ##STR9## wherein x, y and z are integers equal to at least 1 with the sum of x+y+z being an integer equal to 7 or to 26 and wherein said ink composition has a viscosity at 25° C. of from about 2 to about 20 centipoise and a surface tension at 25° C. of greater than about 40 dynes per centimeter.
Claim 16
Dependent Claim
85 words
An aqueous ink composition comprising water, a compatible colorant, and from about 5 to about 20 weight percent of a humectant of the formula: ##STR9## wherein x, y and z are integers equal to at least 1 with the sum of x+y+z being an integer equal to 7 or to 26 and wherein said ink composition has a viscosity at 25° C. of from about 2 to about 20 centipoise and a surface tension at 25° C. of greater than about 40 dynes per centimeter.
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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) | 1995-12-08 | 1996-06-08 | 1996-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-08 | 2000-06-08 | 2000-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-08 | 2004-06-08 | 2004-12-08 | $7700.00 | Window Closed / Lapsed |