Aqueous resin based inkjet inks
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 light; the polymeric shell includes a polymer selected from the group consisting of polyureas, polyesters, polycarbonates, polyamides, and melamine based polymers and copolymers thereof; and the capsules have an average particle size of no more 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 including 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 light;
the polymeric shell includes a polymer selected from the group consisting of polyureas, polyesters, polycarbonates, polyamides, and melamine based polymers, and mixtures thereof; 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 polymeric shell includes a polymer selected from the group consisting of a polyamide, a melamine based polymer, a poly(urea-urethane) polymer, and copolymers thereof.
4. The inkjet ink according to claim 1 , wherein the one or more chemical reactants includes a monomer, an oligomer, or a polymer that is curable by free radical polymerization or by cationic polymerization.
5. The inkjet ink according to claim 2 , wherein the one or more chemical reactants includes a monomer, an oligomer, or a polymer that is curable by free radical polymerization or by cationic polymerization.
6. The inkjet ink according to claim 4 , wherein the monomer, the oligomer, or the polymer includes at least one acrylate group as a polymerizable group.
7. The inkjet ink according to claim 5 , wherein the monomer, the oligomer, or the polymer includes at least one acrylate group as a polymerizable group.
8. The inkjet ink according to claim 4 , further comprising a photoinitiator.
9. The inkjet ink according to claim 1 , wherein the one or more chemical reactants includes a thermally curable compound.
10. The inkjet ink according to claim 2 , wherein the one or more chemical reactants includes a thermally curable compound.
11. The inkjet ink according to claim 9 , wherein the thermally curable compound is a blocked isocyanate.
12. The inkjet ink according to claim 10 , wherein the thermally curable compound is a blocked isocyanate.
13. The inkjet ink according to claim 9 , further comprising an optothermal converting agent.
14. The inkjet ink according to claim 13 , wherein the optothermal converting agent is an infrared dye.
15. The inkjet ink according to claim 1 , further comprising a colorant.
16. The inkjet ink according to claim 1 , wherein the aqueous medium includes a polymeric latex particle.
17. The inkjet ink according to claim 1 , wherein the polymeric shell is crosslinked.
18. The inkjet ink according to claim 2 , wherein the polymeric shell is crosslinked.
19. An inkjet printing method comprising the steps of:
jetting an inkjet ink according to claim 1 on a substrate; and
applying heat and/or light to the inkjet ink jetted on the substrate to form a reaction product from the one or more chemical reactants in the capsules.
20. The inkjet printing method according to claim 19 , wherein the substrate is a textile, leather, glass, pharmaceutical packaging, or food packaging.