Claims
- 1. A process for preparing an ink composition which comprises (a) forming a mixture by admixing water and a base; (b) adding a colorant to the mixture; and (c) adjusting the pH of the mixture by adding phosphorous acid thereto.
- 2. A process according to claim 1 wherein the colorant is a dye.
- 3. A process according to claim 1 wherein the ink also contains a polyamine.
- 4. A process according to claim 1 wherein the ink also contains sulfolane.
- 5. A process according to claim 1 wherein the base is selected from the group consisting of ammonia, ammonium hydroxide, methylamine, dimethylamine, trimethylamine, ethylamine, diethylamine, triethylamine, ethylene diamine, and mixtures thereof.
- 6. A process according to claim 1 wherein the base is ammonium hydroxide.
- 7. A process according to claim 1 wherein the base is present in the ink in an amount of at least about 0.1 percent by weight.
- 8. A process according to claim 2 wherein the base is present in the ink in an amount of at least about 0.5 molar equivalents per molar equivalent of dye.
- 9. A process according to claim 1 wherein the phosphorous acid is added to the ink an amount of at least about 0.1 percent by weight of the ink.
- 10. A process according to claim 1 wherein the phosphorous acid is added to the ink in an amount of from about 0.1 to about 10 percent by weight.
- 11. A process according to claim 1 wherein the pH of the ink is adjusted to a value of from about 6.5 to about 10.0.
- 12. A process according to claim 1 wherein the pH of the ink is adjusted to a value of less than about 7.0.
- 13. An ink composition prepared by the process of claim 1.
- 14. A process for preparing an ink composition which comprises (a) forming a mixture by admixing water and phosphorous acid; (b) adding a colorant to the mixture; and (c) adjusting the pH of the mixture by adding a base thereto.
- 15. A process according to claim 14 wherein the colorant is a dye.
- 16. A process according to claim 14 wherein the ink also contains a polyamine.
- 17. A process according to claim 14 wherein the ink also contains sulfolane.
- 18. A process according to claim 14 wherein the base is selected from the group consisting of ammonia, ammonium hydroxide, methylamine, dimethylamine, trimethylamine, ethylamine, diethylamine, triethylamine, ethylene diamine, and mixtures thereof.
- 19. A process according to claim 14 wherein the base is ammonium hydroxide.
- 20. A process according to claim 14 wherein the base is present in the ink in an amount of at least about 0.1 percent by weight.
- 21. A process according to claim 15 wherein the base is present in the ink in an amount of at least about 0.5 molar equivalents per molar equivalent of dye.
- 22. A process according to claim 14 wherein the phosphorous acid is added to the ink an amount of at least about 0.1 percent by weight of the ink.
- 23. A process according to claim 14 wherein the phosphorous acid is added to the ink in an amount of from about 0.1 to about 10 percent by weight.
- 24. A process according to claim 14wherein the pH of the ink is adjusted to a value of from about 6.5 to about 10.0.
- 25. A process according to claim 14 wherein the pH of the ink is adjusted to a value of less than about 7.0.
- 26. An ink composition prepared by the process of claim 14.
- 27. A process for preparing an ink composition which comprises admixing water, a colorant, a base, and phosphorous acid, wherein the pH of the ink is adjusted by a process selected from the group consisting of (a) adding phosphorous acid to an aqueous solution containing the base, and (b) adding the base to an aqueous solution containing phosphorous acid.
- 28. An ink composition prepared by the process of claim 27.
- 29. A process which comprises incorporating into an ink jet printing apparatus an ink composition according to claim 13 and causing droplets of the ink composition to be ejected in an imagewise pattern onto a substrate.
- 30. A process according to claim 29 wherein the ink is selectively heated in an imagewise pattern, thereby causing droplets of the ink to be ejected in an imagewise pattern.
- 31. A process which comprises incorporating into an ink jet printing apparatus an ink composition according to claim 26 and causing droplets of the ink composition to be ejected in an imagewise pattern onto a substrate.
- 32. A process according to claim 31 wherein the ink is selectively heated in an imagewise pattern, thereby causing droplets of the ink to be ejected in an imagewise pattern.
- 33. A process which comprises incorporating into an ink jet printing apparatus an ink composition according to claim 28 and causing droplets of the ink composition to be ejected in an imagewise pattern onto a substrate.
- 34. A process according to claim 33 wherein the ink is selectively heated in an imagewise pattern, thereby causing droplets of the ink to be ejected in an imagewise pattern.
- 35. An ink composition which comprises water, a colorant, and phosphorous acid.
- 36. An ink composition according to claim 35 wherein the colorant is a dye.
- 37. An ink composition according to claim 35 wherein the ink also contains a polyamine.
- 38. An ink composition according to claim 35 wherein the ink also contains sulfolane and a member selected from the group consisting of N-methyl pyrrolidone and 2-pyrrolidone.
- 39. An ink composition according to claim 35 wherein the phosphorous acid is present in the ink an amount of at least about 0.1 percent by weight of the ink.
- 40. An ink composition according to claim 35 wherein the phosphorous acid is present in the ink in an amount of from about 0.1 to about 10 percent by weight.
- 41. An ink composition according To claim 35 wherein the pH of the ink is from about 6.5 to about 10.0.
- 42. An ink composition according to claim 35 wherein the pH of the ink is less than about 7.0.
- 43. An ink composition which comprises water, a colorant, and a phosphite salt.
- 44. An ink composition according to claim 43 wherein the colorant is a dye.
- 45. An ink composition which comprises water, a colorant, and a phosphite salt, wherein the ink also contains a polyamine.
- 46. An ink composition which comprises water, a colorant, and a phosphite salt, wherein the ink also contains sulfolane.
- 47. An ink composition according to claim 43 wherein the phosphite salt is present in the ink an amount of at least about 0.1 percent by weight of the ink.
- 48. An ink composition according to claim 43 wherein the phosphite salt is present in the ink in an amount of from about 0.1 to about 10 percent by weight.
- 49. An ink composition according to claim 43 wherein the pH of the ink is from about 6.5 to about 10.0.
- 50. An ink composition according to claim 43 wherein the pH of the ink is less than about 7.0.
- 51. An ink composition according to claim 43 wherein the phosphite salt comprises a monohydrogen phosphite.
- 52. An ink composition which comprises water, a colorant, and a phosphite salt, wherein the phosphite salt comprises a dihydrogen phosphite.
- 53. An ink composition which comprises water, a colorant, and a phosphite salt, wherein the phosphite salt comprises a mixture of a monohydrogen phosphite and a dihydrogen phosphite.
- 54. A thermal ink jet printing process which comprises incorporating into a thermal ink jet printing apparatus having nozzles for the ejection of ink an ink composition which comprises water, a colorant, and a phosphite salt, and selectively heating the ink in the nozzles in an imagewise pattern, thereby causing droplets of the ink to be ejected in an imagewise pattern.
- 55. An ink composition which comprises water, a colorant, and a phosphite salt selected from the group consisting of Na.sub.2 HPO.sub.3, Li.sub.2 HPO.sub.3, K.sub.2 HPO.sub.3, and mixtures thereof.
- 56. An ink composition which comprises water, a colorant, and a phosphite salt present in an amount of from about 1 to about 2 percent by weight.
Parent Case Info
This application is a continuation-in-part of U.S. Ser. No. 07/992,240, Dec. 17, 1992, now U.S. Pat. No. 5,258,064, entitled "Ink Compositions and application Preparation Processes Thereof", the disclosure of which is totally incorporated herein by reference.
US Referenced Citations (10)
Foreign Referenced Citations (2)
Number |
Date |
Country |
53-85626 |
Jul 1978 |
JPX |
57-36170 |
Feb 1982 |
JPX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
992240 |
Dec 1992 |
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