Solvent-based inkjet ink formulations
Solvent-based inkjet ink formulations including an organic solvent, a resin, a surfactant, and a colorant are provided. The inks have many desirable attributes such as extended decap time.
1. An inkjet ink, consisting of:
one organic solvent, one resin, one surfactant, and one colorant;
wherein the organic solvent is a fast solvent; the surfactant is a fluorosurfactant; and the surfactant is present in an amount of from about 1.1% to about 5% by weight of the ink.
2. The ink of claim 1 , wherein the fast solvent is selected from the group consisting of methanol, ethanol, propanol, iso-propanol, acetone, methyl ethyl ketone, methyl isobutyl ketone, pentane, hexane, heptane, methyl acetate, ethyl acetate, and propyl acetate.
3. The ink of claim 1 , wherein the resin is selected from the group consisting of rosin modified phenolic resin, phenolic resin, styrene-acrylic resin, and polyketone resin.
4. The ink of claim 1 , wherein the fluorosurfactant is selected from the group consisting of polyethylene oxide-b-poly(tetrafluoroethylene)polymers, 2-(perfluoroalkyl)ethyl stearate, anionic lithium carboxylate fluorosurfactant, anionic phosphate fluorosurfactant, and amphoteric quaternary ammonium-acetate fluorosurfactant.
5. The ink of claim 1 , wherein the ink has a drying time of from about 0.5 second to about 10 seconds.
6. The ink of claim 1 , wherein the ink has a viscosity of from about 1 centipoise to about 25 centipoise.
7. The ink of claim 1 , wherein the ink has a surface tension of from about 20 dynes/cm to about 50 dynes/cm.
8. The ink of claim 1 , wherein the decap time of the ink with surfactant is from about 3 to about 10 fold greater than the ink without surfactant.
9. An inkjet ink, consisting of:
one fast organic solvent, one resin, one surfactant, and one colorant;
wherein the surfactant is a fluorosurfactant; the surfactant is present in an amount of from about 1.1% to about 5% by weight of the ink; and the ink has a decap time of at least about one hour.
10. The ink of claim 9 , wherein the fast organic solvent is ethanol.
11. The ink of claim 9 , wherein the ink has a drying time of less than about 2 seconds.
12. A method of forming a mark on a substrate, the method comprising: transferring an ink of claim 1 to the substrate to provide a mark on the substrate.
13. The method of claim 12 , wherein the substrate comprises a porous or a non-porous substrate.
14. An inkjet printer comprising a printhead, a cartridge, and a reservoir including an ink of claim 1 .
15. The inkjet printer of claim 14 , wherein the printhead or the cartridge has a nozzle diameter of from about 20 microns to about 100 microns.
16. An inkjet ink, consisting of:
one fast organic solvent, one resin, one surfactant, and one colorant;
wherein the resin is selected from the group consisting of rosin modified phenolic resin, phenolic resin, styrene-acrylic resin, polyketone resin; and the ink has a drying time of less than about 2 seconds.
17. The ink of claim 16 , wherein the surfactant is a fluorosurfactant.
18. The ink of claim 1 , wherein the ink has a decap time of at least about one minute.
19. An inkjet ink, consisting of:
one organic solvent, one resin, one surfactant, and one colorant;
wherein the organic solvent is a fast solvent; the surfactant is a fluorosurfactant; the surfactant is present in an amount of from about 1.1% to about 5% by weight of the ink; and the ink consists of greater than 90% by weight of the fast solvent.
20. An inkjet ink, consisting of:
one fast organic solvent, one resin, one surfactant, and one colorant;
wherein the surfactant is a fluorosurfactant; the surfactant is present in an amount of from about 1.1% to about 5% by weight of the ink; the ink has a decap time of at least about one hour; and the ink consists of greater than 90% by weight of the fast organic solvent.
21. An inkjet ink, consisting of:
one fast organic solvent, one resin, one surfactant, and one colorant;
wherein the resin is selected from the group consisting of rosin modified phenolic resin, phenolic resin, styrene-acrylic resin, and polyketone resin; the ink has a drying time of less than about 2 seconds; and the ink consists of greater than 90% by weight of the fast organic solvent.