US5098476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Additive to aqueous-based inks to improve print quality
Assignee: HP Inc
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Filing: 1990-03-15
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Granted: 1992-03-24
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Expires: 2010-03-15
Abstract
Abstract A method for improving the print quality of ink used in ink-jet printers, particularly thermal ink-jet printers, is provided. For an ink typically comprising about 90 to 98 wt % water and about 10 to 2 wt % diethylene glycol plus about 0.1 to 12 wt % dye, the improvement is achieved by adding an additive consisting essentially of about 1 to 30 wt % ethanol, about 1 to 30 wt % n-propanol, about 1 to 10 wt % iso-propanol, or about 0.002 to 0.05 wt % of 2,5,8,11-tetramethyl-6-dodecyn-5,8-diol.
Inventors
- 👤 Jeffrey P. Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:54
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
112 words
A thermal ink-jet composition having a surface tension in the range of about 45 to 60 dyne/cm, substantially uniform drop size, and capable of operating at printer frequencies approaching 6 kHz, consisting essentially of (a) an additive selected from the group consisting of about 1 to 6 wt% of ethanol, about 1 to 6 wt% of n-propanol, about 1 to 5 wt% of iso-propanol, and about 0.002 to 0.05 wt% of 2,5,8,11-tetramethyl-6-dodecyn-5,8-diol, (b) about 0.1 to 12 wt% of a dye, and (c) a vehicle consisting essentially of about 90 to 90% water and the balance a water-miscible organic compound selected from the group consisting of diethylene glycol, propylene glycol, and 2-pyrrolidone.
Claim 2
Dependent Claim
112 words
A thermal ink-jet composition having a surface tension in the range of about 45 to 60 dyne/cm, substantially uniform drop size, and capable of operating at printer frequencies approaching 6 kHz, consisting essentially of (a) an additive selected from the group consisting of about 1 to 6 wt% of ethanol, about 1 to 6 wt% of n-propanol, about 1 to 5 wt% of iso-propanol, and about 0.002 to 0.05 wt% of 2,5,8,11-tetramethyl-6-dodecyn-5,8-diol, (b) about 0.1 to 12 wt% of a dye, and (c) a vehicle consisting essentially of about 90 to 90% water and the balance a water-miscible organic compound selected from the group consisting of diethylene glycol, propylene glycol, and 2-pyrrolidone.
Claim 3
Dependent Claim
16 words
The ink composition of claim 1 wherein the concentration of said 2,5,8,11-tetramethyl-6-dodecyn-5,8-diol is about 0.01 wt%.
Claim 4
Dependent Claim
113 words
In a method of printing from a thermal ink-jet printer onto a medium, wherein an ink is jetted from a pen mounted on said printer, the improvement comprising employing as the ink a composition comprising (a) an additive selected from the group consisting of about 1 to 6 wt% of ethanol, about 1 to 6 wt% of n-propanol, about 1 to 5 wt% of iso-propanol, and about 0.002 to 0.05 wt% of 2,5,8,11-tetramethyl-6-dodecyn-5,8-diol, (b) about 0.1 to 12 wt% of a dye, and (c) a vehicle consisting essentially of about 90 to 98% water and the balance a water-miscible organic compound selected from the group consisting of diethylene glycol, propylene glycol, and 2-pyrrolidone.
Claim 5
Dependent Claim
113 words
In a method of printing from a thermal ink-jet printer onto a medium, wherein an ink is jetted from a pen mounted on said printer, the improvement comprising employing as the ink a composition comprising (a) an additive selected from the group consisting of about 1 to 6 wt% of ethanol, about 1 to 6 wt% of n-propanol, about 1 to 5 wt% of iso-propanol, and about 0.002 to 0.05 wt% of 2,5,8,11-tetramethyl-6-dodecyn-5,8-diol, (b) about 0.1 to 12 wt% of a dye, and (c) a vehicle consisting essentially of about 90 to 98% water and the balance a water-miscible organic compound selected from the group consisting of diethylene glycol, propylene glycol, and 2-pyrrolidone.
Claim 6
Dependent Claim
16 words
In the method of claim 3 wherein the concentration of said 2,5,8,11-tetramethyl-6-dodecyn-5,8-diol is about 0.1 wt%.
References Cited (Backward Citations)
US4153593A
Cited
US4279653A
Cited
US4299630A
Cited
US4184881A
Cited
US4170482A
Cited
US4196007A
Cited
US4295889A
Cited
US4256493A
Cited
JPS56167775A
Cited
JPS5718772A
Cited
US4567213A
Cited
US4661158A
Cited
US4732613A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-03-24 | 1995-09-23 | 1996-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-24 | 1999-09-23 | 2000-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-24 | 2003-09-23 | 2004-03-24 | $7700.00 | Window Closed / Lapsed |