Self-dispersing capsules
View Patent ↗A method for manufacturing capsules for an in inkjet ink includes the steps of a) preparing a non-aqueous solution of a first shell component for forming a polymeric shell and one or more chemical reactants optionally in an organic solvent having a low miscibility with water and having a lower boiling point than water; b) preparing an aqueous solution of a second shell component for forming the polymeric shell and an amphoteric surfactant; c) dispersing the non-aqueous solution under high shear in the aqueous solution; d) optionally stripping the organic solvent from the mixture of the aqueous solution and the non-aqueous solution; and e) preparing a polymeric shell around the one or more chemical reactants by interfacial polymerization of the first and second shell components for forming the polymeric shell.
1. A method for manufacturing capsules for an inkjet ink, the method comprising the steps of:
a) preparing a non-aqueous solution of a first shell component of a polymeric shell and one or more chemical reactants, optionally in an organic solvent having a low miscibility with water and having a lower boiling point than water;
b) preparing an aqueous solution of a second shell component of the polymeric shell and an amphoteric surfactant;
c) dispersing the non-aqueous solution under shear in the aqueous solution;
d) optionally stripping the organic solvent from a mixture of the aqueous solution and the non-aqueous solution; and
e) preparing the polymeric shell around the one or more chemical reactants by interfacial polymerization of the first shell component and the second shell component of the polymeric shell; wherein
the amphoteric surfactant consists of 85% to 100% of a surfactant according to Formula (I):
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.
2. The method according to claim 1 , wherein R is a hydrocarbon chain.
3. The method according to claim 1 , wherein the aqueous solution includes a colorant.
4. The method according to claim 3 , wherein the colorant is a color pigment.
5. The method according to claim 1 , wherein the one or more chemical reactants include a thermally curable compound or a UV curable compound.
6. The method according to claim 5 , wherein the thermally curable compound includes one or more blocked isocyanate groups.
7. The method according to claim 5 , wherein the UV curable compound is a monomer, oligomer, or polymer including one or more free radical curable groups.
8. The method according to claim 1 , wherein the first shell component of the polymeric shell is selected from the group consisting of di-isocyanates and oligoisocyanates.
9. The method according to claim 5 , wherein the first shell component of the polymeric shell is selected from the group consisting of di-isocyanates and oligoisocyanates.
10. The method according to claim 6 , wherein the first shell component of the polymeric shell is selected from the group consisting of di-isocyanates and oligoisocyanates.
11. The method according to claim 8 , wherein the second shell component of the polymeric shell is selected from the group consisting of diamines and oligoamines, and/or selected from the group consisting of dialcohols and oligoalcohols.
12. The method according to claim 10 , wherein the second shell component of the polymeric shell is selected from the group consisting of diamines and oligoamines, and/or selected from the group consisting of dialcohols and oligoalcohols.
13. The method according to claim 1 , wherein the amphoteric surfactant is one or more surfactants selected from the group consisting of:
14. The method according to claim 5 , wherein the amphoteric surfactant is one or more surfactants selected from the group consisting of:
15. The method according to claim 6 , wherein the amphoteric surfactant is one or more surfactants selected from the group consisting of:
16. A method for manufacturing aqueous resin based inkjet inks, the method comprising the steps of:
providing capsules manufactured according to the method of claim 1 ; and
dispersing the capsules in an aqueous medium.
17. A method for manufacturing aqueous resin based inkjet inks, the method comprising the steps of:
providing capsules manufactured according to the method of claim 5 ; and
dispersing the capsules in an aqueous medium.
18. A method for manufacturing aqueous resin based inkjet inks, the method comprising the steps of:
providing capsules manufactured according to the method of claim 6 ; and
dispersing the capsules in an aqueous medium.
19. A method for manufacturing aqueous resin based inkjet inks, the method comprising the steps of:
providing capsules manufactured according to the method of claim 8 ; and
dispersing the capsules in an aqueous medium.
20. Capsules self-dispersible in an aqueous medium for an aqueous inkjet ink obtained by performing the steps a) to e) of claim 1 .
21. An aqueous inkjet ink comprising:
the capsules according to claim 20 .
22. The aqueous inkjet ink according to claim 21 , wherein the capsules include 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.