Dry erase inks, and associated methods and writing instruments
Dry erase ink formulations containing at least one colorant encapsulated in a plurality of capsules wherein the capsules comprise a release agent, methods of erasing dry erase ink formulations, and writing instruments including a writing tip portion connected to a tubular member or refill and a dry erase ink formulation are provided herein.
1. An ink formulation comprising a colorant encapsulated in a plurality of capsules, wherein the plurality of capsules comprises a release agent, where the release agent comprises epoxy acrylate, polyester acrylate, polyether acrylate, 2-(2-ethoxyethoxy) ethylacrylate, 2-phenoxy ethyl acrylate, tetrahydrofurfuryl methacylate, ortho-phenoxy ethyl acrylate, pentaerythriol acrylate, cyclic trimethylolpropane formal acrylate, isobornyl acrylate, benzyl acrylate, 3,3,5-trimethylcyclohexyl acrylate, or any combination thereof, wherein the ink formulation is a dry erase ink.
2. The ink formulation of claim 1 , wherein the release agent is covalently bonded to the plurality of capsules.
3. The ink formulation of claim 1 , wherein the ink formulation contains the colorant in an amount of from about 3 wt. % to about 100 wt. %.
4. The ink formulation of claim 1 , wherein the colorant comprises a lueco dye, a color activating agent, and a reaction medium.
5. The ink formulation of claim 1 , further comprising a solvent.
6. The ink formulation of claim 5 , wherein the ink formulation is from about 20 wt. % to about 80 wt. % solvent.
7. The ink formulation of claim 6 , wherein the solvent comprises an alcohol.
8. The ink formulation of claim 7 , wherein the alcohol is benzyl alcohol, ethanol, n-propanol, n-butanol, diacetone alcohol, or a combination thereof.
9. The ink formulation of claim 1 , further comprising a resin.
10. The ink formulation of claim 9 , wherein the ink formulation is from about 10 wt. % to about 50 wt. % resin.
11. The ink formulation of claim 10 , wherein the resin comprises an acrylic resin.
12. The ink formulation of claim 11 , wherein the resin comprises a water-based acrylic resin.
13. A method of erasing ink comprising:
disposing the ink formulation of claim 1 on a whiteboard or dry erase surface; and
erasing the ink formulation by wiping the whiteboard or dry erase surface with an erasing instrument.
14. A writing instrument comprising:
a writing tip portion connected to a tubular member or refill; and
the ink formulation of claim 1 .
15. A kit comprising:
the writing instrument of claim 14 ; and
an erasing instrument.