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1. WO1997031070 - INK ERADICATOR SYSTEM

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[ EN ]

C A I M S
I. An ink and eradicator fluid combination, comprising
an eradicator fluid containing a basic nitrogen compound and water, and
an ink containing a dye that decolorizes if contacted with said basic nitrogen compound, a binding agent capable of binding said basic nitrogen compound, and water.
2. The combination of claim 1, wherein said eradicator fluid further includes a film- forming polymer .
3. The combination of claim 2, wherein said film- forming polymer comprises a polyacrylic acid salt. 4. The combination of claim 2, wherein said eradicator fluid contains between 8% and 10% of said basic nitrogen compound by weight, between 15% and 25% of said film-forming polymer by weight, and between 60% and 70% water by weight.
5. The combination of claim 1, wherein said ink further includes a film-forming polymer.
6. The combination of claim 1, wherein said ink contains between 3% and 4% of said dye by weight, between 8% and 12% of said binding agent by weight, and between 75% and 85% water by weight.
7. The combination of claim 5, wherein said film-forming polymer comprises a polyacrylate.
8. The combination of claim 7, wherein the pH of said eradicator fluid is between about 10 and about 11. 9. The combination of claim 1, wherein said dye comprises a triaryl methane.
10. The combination of claim 1, wherein said ink further comprises an organic acid.
II. The combination of claim 1, wherein said binding agent comprises a metal salt.
12. The combination of claim 11, wherein said metal salt comprise a magnesium salt.

13. The combination of claim 12 , wherein said magnesium salt comprises magnesium sulfate.
14. The combination of claim 11, wherein said metal salt comprises a zinc salt.
15. The combination of claim 14, wherein said zinc salt comprises zinc sulfate.
16. The combination of claim 1, wherein said basic nitrogen compound comprises an amine.
17. The combination of claim 16, wherein said amine comprises sodium glycinate.
18. The combination of claim 1, wherein said eradicator fluid has an eradication time of less than 3 seconds .
19. The combination of claim 1, wherein said eradicator fluid has a write-over time of less than 10 seconds .
20. The combination of claim 1, wherein said ink has a surface tension of between 25 dynes/cm and 35 dynes/cm, and said eradicator fluid has a surface tension of between 35 dynes/cm and 40 dynes/cm.
21. An eradicatible ink, comprising a dye that decolorizes when said ink is contacted with an 8% by weight in water sodium glycinate solution, a metal salt capable of complexing with sodium glycinate, and water. 22. The eradicatible ink of claim 21, wherein said ink further comprises a non-volatile organic acid. 23. The eradicatible ink of claim 21, wherein said metal salt comprises a salt selected from the group consisting of magnesium salts and zinc salts. 24. A method of eradicating an ink marking on a substrate, comprising
applying to said substrate an ink comprising a dye that decolorizes if contacted with a basic nitrogen compound, a binding agent capable of binding said basic nitrogen compound, and water, to provide a marking on said substrate, and
applying to said marking an eradicator fluid comprising said basic nitrogen compound and water, said basic nitrogen compound causing said dye to decolorize.

25. The method of claim 24, wherein said binding agent comprises a metal salt.
26. The method of claim 24, wherein said basic nitrogen compound comprises an amine.
27. A method of providing a marking, comprising
applying an eradicator fluid containing a basic nitrogen compound and water to a substrate to provide an eradicator fluid coating on said substrate, and
applying to said eradicator fluid coating an ink containing a dye that decolorizes if contacted with said basic nitrogen compound, a binding agent capable of binding to said basic nitrogen compound, and water.