Aqueous resin based inkjet inks
View Patent ↗An inkjet ink includes a) an aqueous medium; and b) capsules composed of a polymeric shell surrounding a core; wherein the capsules are dispersed in the aqueous medium using a dispersing group covalently bonded to the polymeric shell; the core contains one or more chemical reactants capable of forming a reaction product upon application of heat and/or infrared light; and the capsules have an average particle size smaller than 4 μm as determined by dynamic laser diffraction.
1. An inkjet ink comprising:
an aqueous medium; and
capsules including a polymeric shell surrounding a core; wherein
the capsules are dispersed in the aqueous medium by a dispersing group covalently bonded to the polymeric shell;
the core includes one or more chemical reactants that form a reaction product upon application of heat and/or infrared light; and
the capsules have an average particle size of no more than 4 μm as determined by dynamic laser diffraction.
2. The inkjet ink according to claim 1 , wherein the dispersing group is selected from the group consisting of a carboxylic acid or salt thereof, a sulfonic acid or salt thereof, a phosphoric acid ester or salt thereof, a phosphonic acid or salt thereof, an ammonium group, a sulfonium group, a phosphonium group, and a polyethylene oxide group.
3. The inkjet ink according to claim 1 , wherein the one or more chemical reactants includes a thermally curable compound selected from the group consisting of a compound functionalized with at least one functional group selected from the group consisting of an epoxide, an oxetane, an aziridine, an azetidine, a ketone, an aldehyde, a hydrazide, and a blocked isocyanate.
4. The inkjet ink according to claim 3 , wherein the thermally curable compound is a blocked isocyanate.
5. The inkjet ink according to claim 1 , further comprising an optothermal converting agent.
6. The inkjet ink according to claim 4 , further comprising an optothermal converting agent.
7. The inkjet ink according to claim 1 , further comprising a colorant.
8. The inkjet ink according to claim 4 , further comprising a colorant.
9. The inkjet ink according to claim 1 , wherein the aqueous medium includes a polymeric latex particle.
10. The inkjet ink according to claim 1 , wherein the polymeric shell is crosslinked.
11. The inkjet ink according to claim 1 , wherein the aqueous medium includes glycerol.
12. The inkjet ink according to claim 4 , wherein the aqueous medium includes glycerol.
13. An inkjet printing method comprising the steps of:
jetting an inkjet ink according to claim 1 on a substrate; and
applying heat and/or infrared light to the inkjet ink jetted on the substrate to form a reaction product from the one or more chemical reactants in the capsules.
14. An inkjet printing method comprising the steps of:
jetting an inkjet ink according to claim 4 on a substrate; and
applying heat and/or infrared light to the inkjet ink jetted on the substrate to form a reaction product from the one or more chemical reactants in the capsules.
15. The inkjet printing method according to claim 13 , wherein the substrate is a textile, leather, glass, pharmaceutical packaging, or food packaging.
16. The inkjet printing method according to claim 13 , wherein the infrared light is emitted by an infrared radiation source having an emission maximum between 0.8 μm and 1.5 μm.