Aqueous resin based inkjet inks
An inkjet ink contains self-dispersible capsules having a polymeric shell surrounding a core containing one or more chemical reactants, wherein the capsules are dispersed in an aqueous medium by a dispersing group covalently bonded to the polymeric shell, and the dispersing group is a carboxylic acid or salt thereof; and no more than 0.5 wt % of an amphoteric surfactant.
1. An inkjet ink comprising:
self-dispersible capsules including a polymeric shell surrounding a core including one or more chemical reactants, the polymeric shell including a polyurea or a polyurethane; wherein
the self-dispersible capsules are dispersed in an aqueous medium with a dispersing group covalently bonded to the polymeric shell by reacting a diisocyanate or an oligoisocyanate with a surfactant according to Formula (I):
wherein
R represents an optionally substituted aliphatic chain including 8 to 22 carbon atoms, wherein optionally substituted means substituted by a hydroxyl group, a halogen, an ether group including 1 to 6 carbon atoms, an amide group including 1 to 6 carbon atoms, an alkyl group including 1 to 6 carbon atoms, and an aryl group including 1 to 8 carbon atoms;
L represents a divalent linking group including 1 to 6 carbon atoms; and
M + represents a proton or a counterion to compensate for a negative charge of the carboxylate group;
the inkjet ink includes no more than 0.5 wt % of an amphoteric surfactant according to Formula (A):
the weight percentage wt % is based on a total weight of the inkjet ink;
R1 and R2 individually represent an optionally substituted aliphatic chain including 8 to 22 carbon atoms, wherein optionally substituted means substituted by a hydroxyl group, a halogen, an ether group including 1 to 6 carbon atoms, an amide group including 1 to 6 carbon atoms, an alkyl group including 1 to 6 carbon atoms, and an aryl group including 1 to 8 carbon atoms;
L represents a divalent linking group including 1 to 6 carbon atoms; and
M + represents a proton or a counterion to compensate for a negative charge of the carboxylate group.
2. The inkjet ink according to claim 1 , wherein the one or more chemical reactants include one or more thermally curable compounds or one or more UV curable compounds.
3. The inkjet ink according to claim 1 , wherein the self-dispersible capsules include a colorant.
4. The inkjet ink according to claim 2 , wherein the self-dispersible capsules include a colorant.
5. The inkjet ink according to claim 3 , wherein the colorant is a color pigment.
6. The inkjet ink according to claim 2 , wherein the one or more UV curable compounds include a monomer, oligomer, or polymer that is curable by free radical polymerization or by cationic polymerization.
7. The inkjet ink according to claim 6 , wherein the monomer, oligomer, or polymer includes at least one acrylate group as a polymerizable group.
8. The inkjet ink according to claim 6 , further comprising a photoinitiator.
9. The inkjet ink according to claim 2 , wherein the one or more thermally curable compounds includes a blocked isocyanate.
10. The inkjet ink according to claim 5 , wherein the one or more thermally curable compounds includes a blocked isocyanate.
11. The inkjet ink according to claim 1 , further comprising an optothermal converting agent.
12. The inkjet ink according to claim 11 , wherein the optothermal converting agent includes an infrared dye.
13. The inkjet ink according to claim 1 , further comprising a colorant selected from the group consisting of C.I. Pigment Blue 15:3, C.I. Pigment Red 122, C.I. Pigment Yellow 155, and carbon black.
14. The inkjet ink according to claim 9 , further comprising a colorant selected from the group consisting of C.I. Pigment Blue 15:3, C.I. Pigment Red 122, C.I. Pigment Yellow 155, and carbon black.
15. The inkjet ink according to claim 1 , wherein the aqueous medium includes a polymeric latex particle.
16. The inkjet ink according claim 9 , 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. The inkjet ink according to claim 9 , wherein the polymeric shell is crosslinked.
20. 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 form a reaction product from the one or more chemical reactants in the self-dispersible capsules.
21. An inkjet printing method comprising the steps of:
jetting an inkjet ink according to claim 2 on a substrate; and
applying heat and/or light to form a reaction product from the one or more chemical reactants in the self-dispersible capsules.
22. The inkjet printing method according to claim 20 , wherein the substrate is selected from a textile, leather, glass, pharmaceutical, and food packaging.