US5062893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ink formulations by mixing anionic waterfast dyes containing two or more carboxyl groups
Assignee: HP Inc
•
Filing: 1990-06-22
•
Granted: 1991-11-05
•
Expires: 2010-06-22
Abstract
Abstract Inks are provided comprising (a) at least two dyes corresponding to the formula ##STR1## wherein W is COOH, X is H, or COOH, Y is H, COOH, or SO 3 H, Z is H, COOH, or SO 3 H, and R is H, CH 2 COOH, or CH 2 CH 2 COOH; with the proviso that there are at least two COOH groups and that the number of COOH groups is equal to or greater than the number of SO 3 H groups, and (b) a solvent which may be water or a mixture of water and a water-soluble organic solvent provide excellent waterfast prints on paper. The inks preferably have a pH from about 7 to about 9.5. Also preferably, a phosphate is added to reduce kogation and a metal chelating agent is added to further reduce nozzle clogging.
Inventors
- 👤 Raymond J. Adamic
- 👤 Palitha Wickramanayake
- 👤 Suraj L. Hindagolla
- 👤 Garold E. Radke
- 👤 David J. Halko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:37
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30; C09D11/32; C09D11/328
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
116 words
An ink comprising, by wt %: a) from about 0.5% to about 20% of at least two dyes, each of which, in the free acid state, independently corresponds to the formula ##STR4## wherein W is COOH, X is H or COOH, Y is H, COOH, or SO 3 H, Z is H, COOH, or SO 3 H, and R is H, CH 2 COOH, or CH 2 CH 2 COOH; provided that there are at least two COOH groups and that the number of COOH groups is equal to or greater than the number of SO 3 H groups, b) up to about 30% of a water soluble organic solvent for said dye, and c) water.
Claim 2
Dependent Claim
116 words
An ink comprising, by wt %: a) from about 0.5% to about 20% of at least two dyes, each of which, in the free acid state, independently corresponds to the formula ##STR4## wherein W is COOH, X is H or COOH, Y is H, COOH, or SO 3 H, Z is H, COOH, or SO 3 H, and R is H, CH 2 COOH, or CH 2 CH 2 COOH; provided that there are at least two COOH groups and that the number of COOH groups is equal to or greater than the number of SO 3 H groups, b) up to about 30% of a water soluble organic solvent for said dye, and c) water.
Claim 3
Dependent Claim
18 words
The ink of claim 1 wherein each dye comprises at least about 10% of the total dye concentration.
Claim 4
Dependent Claim
44 words
The ink of claim 1 comprising two dyes, a first dye wherein W and X are COOH, Y and R are H, and Z is SO 3 H, and a second dye wherein W and X are COOH and Y, Z, and R are
Claim 5
Dependent Claim
20 words
The ink of claim 3 wherein said two dyes are present in a ratio ranging from about 15:85 to 70:30.
Claim 6
Dependent Claim
49 words
The ink of claim 1 comprising two dyes, a first dye wherein W and X are COOH, Y and R are H, and Z is SO 3 H, and a second dye wherein W and X are COOH, Y is SO 3 H, and Z and R are H.
Claim 7
Dependent Claim
25 words
The ink of claim 1 wherein the dye is present in the form of its alkali metal salt or its ammonium or substituted ammonium salt.
Claim 8
Dependent Claim
74 words
The ink of claim 6 wherein the alkali metal ion is selected from the group consisting of Na + , K + , and Li + and wherein the ammonium and substituted ammonium salt is selected from the group consisting of NH 4 + , (CH 3 ) 4 N + , (CH 3 ) 3 NH 30 , (CH 3 ) 2 NH 2 30 , and CH 3 NH 3 + .
Claim 9
Dependent Claim
14 words
The ink of claim 1 having a pH from about 7 to about 9.5.
Claim 10
Dependent Claim
121 words
An ink comprising, by wt %: a) from about 1% to about 10% of at least two dyes each independently corresponding to the following formula ##STR5## wherein W is COOH, X is H or COOH, Y is H, COOH, or SO 3 H, Z is H, COOH, or SO 3 H, and R is H, CH 2 COOH, or CH 2 CH 2 COOH; provided that there are at least two COOH groups and that the number of COOH groups is equal to or greater than the number of SO 3 H groups, b) about 2% to about 30% water-soluble organic solvent, c) water, and d) sufficient buffer to maintain the ink at a pH from about 7 to about 9.5.
Claim 11
Dependent Claim
121 words
An ink comprising, by wt %: a) from about 1% to about 10% of at least two dyes each independently corresponding to the following formula ##STR5## wherein W is COOH, X is H or COOH, Y is H, COOH, or SO 3 H, Z is H, COOH, or SO 3 H, and R is H, CH 2 COOH, or CH 2 CH 2 COOH; provided that there are at least two COOH groups and that the number of COOH groups is equal to or greater than the number of SO 3 H groups, b) about 2% to about 30% water-soluble organic solvent, c) water, and d) sufficient buffer to maintain the ink at a pH from about 7 to about 9.5.
Claim 12
Dependent Claim
45 words
The ink of claim 9 comprising two dyes, a first dye wherein W and X are COOH, Y and R are H, and Z is SO 3 H, and a second dye wherein W and X are COOH and Y, Z and R are H.
Claim 13
Dependent Claim
20 words
The ink of claim 10 wherein said two dyes are present in a ratio ranging from about 15:85 to 70:30.
Claim 14
Dependent Claim
50 words
The ink of claim 9 comprising two dyes, a first dye wherein W and X are COOH, Y and R are H and Z is SO 3 H, and a second dye wherein W and X are COOH and Y is SO 3 H, and Z and R are H.
Claim 15
Dependent Claim
25 words
The ink of claim 9 wherein the dye is present in the form of its alkali metal salt or its ammonium or substituted ammonium salt.
Claim 16
Dependent Claim
74 words
The ink of claim 9 wherein the alkali metal ion is selected from the group consisting of Na + , K + , and Li + and wherein the ammonium and substituted ammonium salt is selected from the group consisting of NH 4 30 , (CH 3 ) 4 N + , (CH 3 ) 3 NH 30 , (CH 3 ) 2 NH 2 30 , and CH 3 NH 3 + .
Claim 17
Dependent Claim
54 words
The ink of claim 9 wherein the water-soluble organic solvent is an alkanol having 1 to 4 carbon atoms, an amide, a ketone, a ketone alcohol, an ether, a nitrogen containing heterocyclic ketone, a polyalkylene glycol, an alkylene glycol, an alkylene thioglycol, thiodiglycol, a polyol or a lower alkyl ether of a polyhydric alcohol.
Claim 18
Dependent Claim
14 words
The ink of claim 15 wherein the organic solvent is diethylene glycol or 2-pyrrolidone.
Claim 19
Dependent Claim
133 words
An ink comprising, by wt %: (a) from about 1% to about 10% total of two dyes each independently corresponding to the following formula ##STR6## wherein for the first dye: W and X are COOH, Y is H, Z is SO 3 H, and R is H; and wherein for the second dye: W and X are COOH, and Y and Z are H, and R is H; (b) about 7.5% to 10% of a water-soluble organic solvent selected from the group consisting of 2-pyrrolidone and diethylene glycol; (c) sufficient buffer to maintain the ink at a pH from about 7 to about 9.5; (e) about 0.005 to 0.5 wt % of a monobasic or dibasic phosphate; (f) about 0.01 to 0.5 wt % of a metal chelating agent; (g) the balance water.
Claim 20
Dependent Claim
133 words
An ink comprising, by wt %: (a) from about 1% to about 10% total of two dyes each independently corresponding to the following formula ##STR6## wherein for the first dye: W and X are COOH, Y is H, Z is SO 3 H, and R is H; and wherein for the second dye: W and X are COOH, and Y and Z are H, and R is H; (b) about 7.5% to 10% of a water-soluble organic solvent selected from the group consisting of 2-pyrrolidone and diethylene glycol; (c) sufficient buffer to maintain the ink at a pH from about 7 to about 9.5; (e) about 0.005 to 0.5 wt % of a monobasic or dibasic phosphate; (f) about 0.01 to 0.5 wt % of a metal chelating agent; (g) the balance water.
Claim 21
Dependent Claim
20 words
The ink of claim 17 wherein said two dyes are present in a ratio ranging from about 15:85 to 70:30.
Claim 22
Dependent Claim
16 words
The ink of claim 18 wherein said two dyes are present in a ratio of 50:50.
Claim 23
Dependent Claim
13 words
The ink of claim 17 wherein the dye is present in ammonium salt.
Claim 24
Dependent Claim
24 words
The ink of claim 17 wherein said metal chelating agent consists essentially of ethylenediaminetetraacetic acid, present in an amount of about 0.1 wt %.
Claim 25
Dependent Claim
69 words
The ink of claim 17 consisting essentially of: (a) about 1.1 wt % of each of said two dyes; (b) about 7.5 wt % of 2-pyrrolidone; (c) about 0.2 wt % of sodium borate decahydrate and 0.2 wt % of tris[hydroxymethyl]aminomethane; (d) about 0.07 wt % of phosphate anion; (e) about 0.1 wt % of ethylenediaminetetraacetic (f) about 0.3 wt % of a biocide; and (g) the balance water.
Claim 26
Dependent Claim
18 words
The ink of claim 1 further containing about 0.01 to 0.5 wt % of a metal chelating agent.
Claim 27
Dependent Claim
18 words
The ink of claim 9 further containing about 0.01 to 0.5 wt % of a metal chelating agent.
References Cited (Backward Citations)
US4963189A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-11-04 | 1995-05-06 | 1995-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-04 | 1999-05-06 | 1999-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-04 | 2003-05-06 | 2003-11-05 | $7700.00 | Window Closed / Lapsed |