EP0425150A2
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EP
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Ink additives for improved ink-jet performance
Assignee: HP Inc
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Filing: 1990-10-12
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Granted: —
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Expires: 2010-10-12
Abstract
Abstract Oxo anions (both singly and multiply charged), such as phosphates, polyphosphates, and phosphate esters, serve as additives, and in the case of cationic dyes, may serve as replacement counter-ions, for use in thermal ink-jet inks to reduce kogation significantly. The addition of such additive essentially eliminates kogation for the life of ink pens. Further, such additives will prevent kogation for inks containing dyes with negatively-charged water-solubilizing groups, such as sulfonate and carboxylate.
Inventors
- 👤 David J. Halko
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 12:11
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30; C09D11/38
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
23 words
An ink for thermal ink-jet printing comprising a vehicle and a dye, characterized by the presence of at least one oxo anion therein.
Claim 2
Dependent Claim
23 words
An ink for thermal ink-jet printing comprising a vehicle and a dye, characterized by the presence of at least one oxo anion therein.
Claim 3
Dependent Claim
17 words
The ink of Claim 1 wherein said vehicle comprises at least one glycol and the balance water.
Claim 4
Dependent Claim
20 words
The ink of Claim 2 wherein said vehicle comprises up to about 10 wt% diethylene glycol and the balance water.
Claim 5
Dependent Claim
17 words
The ink of Claim 1 wherein said vehicle comprises at least one pyrrolidone and the balance water.
Claim 6
Dependent Claim
19 words
The ink of Claim 4 wherein said vehicle comprises up to about 10 wt% 2-pyrrolidone and the balance water.
Claim 7
Dependent Claim
17 words
The ink of Claim 1 comprising about 1 to 12 wt% of a cationic or anionic dye.
Claim 8
Dependent Claim
29 words
The ink of Claim 1 wherein said at least one oxo anion is selected from the group consisting of phosphates, polyphosphates, phosphate esters, arsenate, molybdate, sulfate, sulfite, and oxalate.
Claim 9
Dependent Claim
18 words
The ink of Claim 7 wherein said phosphate is in the form of dibasic, monobasic, or diphosphate anions.
Claim 10
Dependent Claim
21 words
The ink of Claim 7 wherein said phosphate ester is selected from the group consisting of mono-organo and di-organo phosphate esters.
Claim 11
Dependent Claim
25 words
The ink of claim 1 wherein said at least one oxo anion is present in an amount ranging from about 9 mg/L to 14 wt%.
Claim 12
Dependent Claim
24 words
The ink of claim 10 wherein said at least one oxo anion is present in an amount ranging from about 0.01 to 1 wt%.
Claim 13
Independent Claim
36 words
A method of reducing kogation in an ink used in thermal ink-jet printers, said ink comprising a vehicle and a dye, characterised in that the ink is as claimed in any of claims 1 to 11.
References Cited (Backward Citations)
No citation records indexed.
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