Erasure fluid

Patent metadata

Field	Value
Publication number	US-9523006-B2
Application number	US-201114114947-A
Country	US
Kind code	B2
Filing date	Jun 3, 2011
Priority date	Jun 3, 2011
Publication date	Dec 20, 2016
Grant date	Dec 20, 2016

Abstract

An erasure fluid includes a vehicle, an erasure component incorporated into the vehicle, and a polymer. The erasure component interacts with a selected colorant of an erasable inkjet ink printed on a medium to erase the inkjet ink from the medium, and is chosen from persulfate ions, peroxymonosulfate ions, hydrogen peroxide, chlorate ions, hypochlorite ions, ascorbic acid, and a chelating agent. Further, the polymer is chosen from carboxymethylcelluloses, methyl celluloses, polyethylene glycols, guar gum, starches, and combinations thereof.

First claim

What is claimed is:

1. An erasure fluid, comprising:
a vehicle;
an erasure component incorporated into the vehicle, the erasure component being selected to interact with a selected colorant of an erasable inkjet ink printed on a paper medium to erase the inkjet ink from the paper medium, the erasure component being selected from the group consisting of persulfate ions, peroxymonosulfate ions, chlorate ions, ascorbic acid, and sodium bicarbonate;
a polymer selected from the group consisting of carboxymethylcelluloses, methyl celluloses, polyethylene glycols, guar gum, starches, and combinations thereof; and
a pH buffer selected from the group consisting of 3-(N-morpholino)propanesulfonic acid (MOPS), 3-morpholino-2-hydroxy-propanesulfonic acid (MOPSO), 1,4-piperazinediethanesulfonic acid (PIPES), and tris(hydroxymethyl)aminomethane (TRIS);
wherein the erasable ink is removable from the paper medium by degradation of the colorant in response to a chemical reaction between the colorant of the erasable ink composition and the erasure component.

2. The erasure fluid as defined in claim 1 wherein the erasure component is selected from the group consisting of persulfate ions, peroxymonosulfate ions, and chlorate ions, and wherein the erasure component is present in an amount ranging from about 0.25 wt % to about 6 wt % of the erasing fluid.

3. The erasure fluid as defined in claim 1 wherein the erasure component is selected from the group consisting of ascorbic acid and sodium bicarbonate, and wherein the erasure component is present in an amount ranging from about 1 wt % to about 10 wt %.

4. The erasure fluid as defined in claim 1 wherein the vehicle comprises a solvent selected from the group consisting of 1,2-propanediol, glycerol, tetraethylene glycol, and combinations thereof, and wherein the solvent is present in an amount ranging from about 1 wt % to about 25 wt % of the erasing fluid.

5. The erasure fluid as defined in claim 1 wherein the erasure component is selected from the group consisting of sodium persulfate, sodium peroxymonosulfate, sodium chlorate, ascorbic acid, and combinations thereof, and wherein the erasure component interacts with the colorant of the inkjet ink printed on the paper medium in the presence of oxygen to erase the inkjet ink from the paper medium.

6. The erasure fluid as defined in claim 4 wherein the erasure component is activatable by a catalyst present in any of the inkjet ink or the paper medium upon which the inkjet ink was printed.

7. The erasure fluid as defined in claim 1 , further comprising a surfactant selected from a non-hydrophobic material.

8. The erasure fluid as defined in claim 1 wherein the polymer selected has a viscosity less than 10 cP, and wherein the erasure fluid is jettable from an inkjet printhead.

9. An erasure fluid, comprising:
a vehicle, comprising:
1,2-propanediol present in an amount ranging from about 10 wt % to about 15 wt %; and
glycerol present in an amount ranging from about 10 wt % to about 15 wt %;

an erasure component incorporated into the vehicle, the erasure component being selected to interact with a selected colorant of an erasable inkjet ink printed on a paper medium to erase the inkjet ink from the paper medium, the erasure component being sodium persulfate present in an amount ranging from about 1 wt % to about 3 wt % of the erasure fluid; and a pH buffer selected from the group consisting of 3-(N-morpholine)propanesulfonic acid (MOPS), 3-morpholino-2-hydroxy-propanesulfonic acid (MOPSO), 1,4-piperazinediethanesulfonic acid (PIPES), and tris(hydroxymethyl)aminomethane (TRIS);
wherein the erasable ink is removable from the paper medium by degradation of the colorant in response to a chemical reaction between the colorant of the erasable ink composition and the erasure component.

10. A method of making an erasure fluid, comprising:
forming a vehicle comprising a solvent;
adding an erasure component to the vehicle, the erasure component being selected from the group consisting of persulfate ions, peroxymonosulfate ions, chlorate ions, ascorbic acid, and sodium bicarbonate;
adding a polymer to the vehicle, the polymer being selected from the group consisting of carboxymethylcelluloses, methyl celluloses, polyethylene glycols, guar gum, starches, and combinations thereof; and
adding a pH buffer to the vehicle, the pH buffer selected from the group consisting of 3-(N-morpholino)propanesulfonic acid (MOPS), 3-morpholino-2-hydroxy-propanesulfonic acid (MOPSO), 1,4-piperazinediethanesulfonic acid (PIPES), and tris(hydroxymethyl)aminomethane (TRIS);
wherein the erasure component is selected to interact with a selected colorant of an erasable inkjet ink printed on a paper medium to erase the inkjet ink from the paper medium;
and wherein the erasable ink is removable from the paper medium by degradation of the colorant in response to a chemical reaction between the colorant of the erasable ink composition and the erasure component.

11. The method as defined in claim 10 , further comprising:
selecting a surfactant from a group of surfactants to contribute to removal of the colorant from fibers of the paper medium; and
incorporating the surfactant into the vehicle.

12. The method as defined in claim 10 wherein the paper medium is selected from plain papers and coated papers.

13. The method as defined in claim 10 wherein the erasure fluid is printable from an inkjet printhead.

14. The method as defined in claim 10 wherein the erasure fluid is applied to the paper medium during a post coating process to erase the inkjet ink previously printed thereon, and wherein the method further comprises incorporating an additive into the erasure fluid prior to being applied to the paper medium, the additive being selected from a material to improve any of curl, cockle, reliability, or durability of the paper medium from which the inkjet ink is to be erased.

15. The erasure fluid as defined in claim 9 , further comprising a surfactant selected from a non-hydrophobic material.

16. The erasure fluid as defined in claim 9 , further comprising:
a polymer selected from the group consisting of carboxymethylcelluloses, methyl celluloses, polyethylene glycols, guar gum, starches, and combinations thereof;
wherein the polymer selected has a viscosity less than 10 cP, and wherein the erasure fluid is jettable from an inkjet printhead.

17. The erasure fluid as defined in claim 1 wherein
the erasure component is the peroxymonosulfate ions, and the peroxymonosulfate ions are selected from the group consisting of sodium peroxymonosulfate, potassium peroxymonosulfate, and lithium peroxymonosulfate; or
the erasure component is the chlorate ions, and the chlorate ions are selected from the group consisting of sodium chlorate and potassium chlorate.

18. A printing system, comprising:
an ink set comprising:
an erasable inkjet ink including a colorant; and
an erasure fluid comprising:
a vehicle;
an erasure component incorporated into the vehicle, the erasure component being selected to interact with the colorant of the erasable inkjet ink printed on a paper medium to erase the inkjet ink from the paper medium, the erasure component being selected from the group consisting of persulfate ions, peroxymonosulfate ions, chlorate ions, ascorbic acid, and sodium bicarbonate; and
a polymer selected from the group consisting of carboxymethylcelluloses, methyl celluloses, polyethylene glycols, guar gum, starches, and combinations thereof; and a pH buffer selected from the group consisting of 3-(N-morph

Assignees

• Adamic Raymond
• Hewlett Packard Development Co Lp

Inventors

• Adamic Raymond

Classifications

• C11D3/222

  Natural or synthetic polysaccharides, e.g. cellulose, starch, gum, alginic acid or cyclodextrin · CPC title

• C11D3/3707

  Polyethers, e.g. polyalkyleneoxides · CPC title

• C11D3/3947

  Liquid compositions · CPC title

• C11D1/72

  Ethers of polyoxyalkylene glycols · CPC title

• C11D3/2003

  Alcohols; Phenols · CPC title