US5026425A
Expired / Lapsed
US
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Waterfastness of DB-168 ink by cation substitution
Assignee: HP Inc
•
Filing: 1989-12-11
•
Granted: 1991-06-25
•
Expires: 2009-12-11
Abstract
Abstract Inks for ink-jet printing containing Direct Black 168 dye have improved water resistance when the sodium cations on the dye are replaced with cations selected from the group consisting of ammonium, polyfunctional, and volatile amine cations.
Inventors
- 👤 Suraj L. Hindagolla
- 👤 Charles L. Thierheimer, Jr.
- 👤 John M. Skene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:04
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30; C09D11/32; C09D11/328
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
70 words
An ink suitable for ink-jet printing, comprising, by weight: (a) from about 5 % to about 15 % of a pyrrolidone selected from the group consisting of N-2-hydroxy ethyl)-2-pyrrolidone, N-methyl pyrrolidone, and 2-pyrrolidone and mixtures thereof, (b) from about 0.5 % to about 10 % DB-168 dye having cations associated therewith selected from the group consisting of ammonium, polyfunctional amine cations, and volatile amine cations, and (c) the balance water.
Claim 2
Dependent Claim
70 words
An ink suitable for ink-jet printing, comprising, by weight: (a) from about 5 % to about 15 % of a pyrrolidone selected from the group consisting of N-2-hydroxy ethyl)-2-pyrrolidone, N-methyl pyrrolidone, and 2-pyrrolidone and mixtures thereof, (b) from about 0.5 % to about 10 % DB-168 dye having cations associated therewith selected from the group consisting of ammonium, polyfunctional amine cations, and volatile amine cations, and (c) the balance water.
Claim 3
Dependent Claim
26 words
The ink of claim 1 wherein said volatile amine cations are selected from the group consisting of methyl amine, ethyl amine, dimethyl amine, and diethyl amine.
Claim 4
Dependent Claim
21 words
The ink of claim 1 wherein said polyfunctional amine cations are selected from the group consisting of diethylenetriamine, triethylenetetramine, and tetraethylenepentamine.
Claim 5
Dependent Claim
17 words
The ink of claim 1 which has been buffered to a pH from about 5 to 9.
Claim 6
Dependent Claim
17 words
The ink of claim 4 which has been buffered to a pH from about 6 to 8.
Claim 7
Dependent Claim
20 words
The ink of claim 5 which contains, as buffer, ammonium acetate, ammonium format, 2-[N-morpholino] ethane-sulfonic acid, or 3-[N-morpholino]-2-hydroxypropane sulfonic acid.
Claim 8
Dependent Claim
10 words
The ink of claim 1 which additionally contains a biocide.
Claim 9
Dependent Claim
14 words
The ink of claim 1 which additionally contains a non-corrosive, low toxicity, water-soluble salt.
Claim 10
Dependent Claim
15 words
The ink of claim 8 wherein said non-corrosive salt is a lower alkyl ammonium chloride.
Claim 11
Dependent Claim
18 words
The ink of claim 1 wherein said dye is present in a range from about 1% to 4%.
Claim 12
Dependent Claim
75 words
An ink suitable for ink-jet printing, comprising, by weight: (a) from about 5% to 15% of a pyrrolidone selected from the group consisting of N-(2-hydroxy ethyl)-2-pyrrolidone, N-methyl pyrrolidone, and 2-pyrrolidone and mixtures thereof, (b) from about 1% to 4% DB-168 dye having cations associated therewith selected from the group consisting of ammonium and diethylenetriamine, (c) a buffering agent to provide the ink with a pH from about 6 to 8, and (d) the balance water.
Claim 13
Dependent Claim
75 words
An ink suitable for ink-jet printing, comprising, by weight: (a) from about 5% to 15% of a pyrrolidone selected from the group consisting of N-(2-hydroxy ethyl)-2-pyrrolidone, N-methyl pyrrolidone, and 2-pyrrolidone and mixtures thereof, (b) from about 1% to 4% DB-168 dye having cations associated therewith selected from the group consisting of ammonium and diethylenetriamine, (c) a buffering agent to provide the ink with a pH from about 6 to 8, and (d) the balance water.
Claim 14
Dependent Claim
26 words
The ink of claim 11 wherein said buffering agent is selected from the group consisting of ammonium acetate, ammonium format, 2-[N-morpholino]-ethanesulfonic acid, and 3-[N-morpholino]-2-hydroxypropane sulfonic acid.
Claim 15
Independent Claim
38 words
A method for improving the waterfastness of an ink containing DB-168 dye comprising replacing substantially all first cations on said dye with second cations selected from the group consisting of ammonium, polyfunctional amine cations, and volatile amine cations.
Claim 16
Independent Claim
38 words
A method for improving the waterfastness of an ink containing DB-168 dye comprising replacing substantially all first cations on said dye with second cations selected from the group consisting of ammonium, polyfunctional amine cations, and volatile amine cations.
Claim 17
Dependent Claim
26 words
The method of claim 13 wherein said volatile amine cations are selected from the group consisting of methyl amine, ethyl amine, dimethyl amine, and diethyl amine.
Claim 18
Dependent Claim
21 words
The method of claim 13 wherein said polyfunctional amine cations are selected from the group consisting of diethylenetriamine, triethylenetetramine, and tetraethylenepentamine.
Claim 19
Dependent Claim
19 words
The method of claim 13 wherein said second cations are selected from the group consisting of ammonium and diethylenetriamine.
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