US5100470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waterfast ink formulations for thermal ink-jet using organic amines
Assignee: HP Inc
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Filing: 1990-10-25
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Granted: 1992-03-31
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Expires: 2010-10-25
Abstract
Abstract A print which has superior waterfastness can be made on paper from an ink-jet printer using an ink comprising a water soluble dye, water with or without a water soluble organic solvent, and sufficient polyalkylene polyamine to provide the ink with a pH of at least 10. About 2 to 10% urea may be added to the ink to reduce crusting of the ink.
Inventors
- 👤 Suraj L. Hindagolla
- 👤 Lisa M. Pagh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:53
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30; C09D11/38
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
64 words
An ink for an ink-jet printer, said ink having a pH of at least 9 and comprising, by weight: (a) from about 0.05% to about 10% water soluble dye, (b) from 0% to about 25% of a water soluble organic solvent, (c) from about 0.01% to about 4% of a polyalkylene polyamine having from one to five nitrogen atoms, and (d) the balance water.
Claim 2
Dependent Claim
64 words
An ink for an ink-jet printer, said ink having a pH of at least 9 and comprising, by weight: (a) from about 0.05% to about 10% water soluble dye, (b) from 0% to about 25% of a water soluble organic solvent, (c) from about 0.01% to about 4% of a polyalkylene polyamine having from one to five nitrogen atoms, and (d) the balance water.
Claim 3
Dependent Claim
16 words
The ink of claim 1 wherein the polyamine is diethylene triamine, triethylene tetramine, or tetraethylene pentamine.
Claim 4
Dependent Claim
14 words
The ink of claim 1 wherein the water soluble dye is an azo dye.
Claim 5
Dependent Claim
15 words
The ink of claim 1 wherein the organic solvent is diethylene glycol, formamide, or 2-pyrrolidone.
Claim 6
Dependent Claim
12 words
The ink of claim 1 further including about 2 to 10% urea.
Claim 7
Dependent Claim
24 words
The ink of claim 1 wherein the dye has one or more acidic groups selected from --COOH, --PO 3 H, and --SO 3 H.
Claim 8
Dependent Claim
17 words
The ink of claim 6 wherein all the acidic groups on the dye are --SO 3 H.
Claim 9
Dependent Claim
62 words
An ink for an ink-jet printer, said ink having a pH of at least 9 and comprising by weight: (a) from about 2 to about 5% water soluble dye, (b) from about 2 to about 10% water soluble organic solvent, (c) from about 0.05 to about 2% polyalkylene polyamine having about 3 to about 5 nitrogen atoms, and (d) the balance water.
Claim 10
Dependent Claim
62 words
An ink for an ink-jet printer, said ink having a pH of at least 9 and comprising by weight: (a) from about 2 to about 5% water soluble dye, (b) from about 2 to about 10% water soluble organic solvent, (c) from about 0.05 to about 2% polyalkylene polyamine having about 3 to about 5 nitrogen atoms, and (d) the balance water.
Claim 11
Dependent Claim
14 words
The ink of claim 8 wherein the water soluble dye is an azo dye.
Claim 12
Dependent Claim
15 words
The ink of claim 8 wherein the organic solvent is diethylene glycol, formamide, or 2-pyrrolidone.
Claim 13
Dependent Claim
12 words
The ink of claim 8 further including about 2 to 10% urea.
Claim 14
Dependent Claim
23 words
The ink of claim 8 wherein the dye has one or more acidic groups selected from --COOH, --PO 3 H, and--SO 3 H.
Claim 15
Dependent Claim
17 words
The ink of claim 12 wherein all the acidic groups on the dye are --SO 3 H.
Claim 16
Dependent Claim
26 words
The ink of claim 13 containing about 2% dye, from about 5 to about 6% diethylene glycol, and triethylene tetramine or tetraethylene pentamine as the polyamine.
Claim 17
Dependent Claim
10 words
The ink of claim 14 additionally containing about 5% urea.
Claim 18
Dependent Claim
22 words
The ink of claim 13 containing about 2% dye, from about 7 to about 8% 2-pyrrolidone, and tetraethylene pentamine as the polyamine.
Claim 19
Dependent Claim
10 words
The ink of claim 16 additionally containing about 5% urea.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-03-31 | 1995-09-30 | 1996-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-31 | 1999-09-30 | 2000-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-31 | 2003-09-30 | 2004-03-31 | $7700.00 | Window Closed / Lapsed |