Ink jettable, UV-curable compositions
Ink jettable and UV-curable compositions include a reactive polymer comprising: (a1) at least 20 mol % of recurring units comprising pendant metal complexing water-solubilizing groups, and (b) at least 5 mol % of recurring units comprising a pendant group capable of crosslinking via [2+2] photocycloaddition. The compositions can optionally have a humectant, a dye or pigment colorant, an anionic or nonionic surfactant, a water-soluble or water-dispersible acrylic polymer, or a water-soluble or water-dispersible polyurethane. Such ink jettable and UV-curable compositions can include a complex of reducible metal ions or metal nanoparticles with the reactive polymer.
1. An ink jettable and UV-curable composition comprising:
a reactive polymer comprising: (a1) at least 40 mol % of recurring units comprising pendant metal complexing water-solubilizing groups that include a sulfonic acid group or sulfonate group in combination with a carboxylic acid group or carboxylate group, (b) at least 5 mol % of recurring units comprising a pendant group capable of crosslinking via [2+2] photocycloaddition, and optionally (c) at least 1 mol % of recurring units comprising a pendant amide, hydroxyl, or lactam group, or a pendant precursor moiety for the pendant amide, hydroxyl, or lactam group, all amounts based on the total recurring units in the reactive polymer; and
optionally, one or more of the following components:
a humectant,
a dye or pigment colorant,
an anionic or nonionic surfactant,
a water-soluble or water-dispersible acrylic polymer, and
a water-soluble or water-dispersible polyurethane.
2. The ink jettable and UV-curable composition of claim 1 , wherein the reactive polymer comprises at least 40 mol % and up to and including 95 mol % of the (a1) recurring units, based on the total recurring units in the reactive polymer.
3. The ink jettable and UV-curable composition of claim 1 , wherein the reactive polymer comprises at least 5 mol % and up to and including 50 mol % of the (b) recurring units, based on the total recurring units in the reactive polymer.
4. The ink jettable and UV-curable composition of claim 1 , wherein the reactive polymer comprises at least 1 mole % and up to and including 55 mol % of (c) recurring units comprising pendant hydroxyl or amide groups, based on the total recurring units in the reactive polymer.
5. The ink jettable and UV-curable composition of claim 1 , wherein the (b) recurring units comprise:
(i) a photosensitive —C(═O)—CR═CR 1 —Y group wherein R and R 1 are independently hydrogen or an alkyl group having 1 to 7 carbon atoms, a 5- to 6-membered cycloalkyl group, an alkoxy group having 1 to 7 carbon atoms, a phenyl group, or a phenoxy group, and Y is an aryl or heteroaryl group;
(ii) a photosensitive, non-aromatic unsaturated carbocyclic group;
(iii) a photosensitive, aromatic or non-aromatic heterocyclic group comprising a carbon-carbon double bond that is conjugated with an electron withdrawing group;
(iv) a photosensitive non-aromatic unsaturated heterocyclic group comprising one or more amide groups that are conjugated with a carbon-carbon double bond, which photosensitive non-aromatic unsaturated heterocyclic group is linked to the water-soluble backbone at an amide nitrogen atom; or
(v) a photosensitive substituted or unsubstituted 1,2-diarylethylene group.
6. The ink jettable and UV-curable composition of claim 1 , further comprising a humectant that is chosen from at least one of the following groups of compounds:
(1) polyhydric alcohols;
(2) polyoxygenated polyols and their derivatives;
(3) sulfur-containing polyol compounds;
(4) cyclic lactams; and
(5) cyclic ureas.
7. The ink jettable and UV-curable composition of claim 1 , further comprising a pigment colorant.
8. The ink jettable and UV-curable composition of claim 1 further comprising a pigment colorant that has a median particle diameter of less than 150 nm, in an amount of at least 0.1 weight % and up to and including 30 weight %, based on the total weight of the ink jettable and UV-curable composition.
9. The ink jettable and UV-curable composition of claim 1 , further comprising a nonionic surfactant.
10. The ink jettable and UV-curable composition of claim 1 , further comprising a water-soluble or water-dispersible polyurethane.
11. The ink jettable and UV-curable composition of claim 1 having a viscosity of less than 3 centipoise as measured at 25° C.
12. The ink jettable and UV-curable composition of claim 1 , further comprising a photosensitizer.
13. The ink jettable and UV-curable composition of claim 5 further comprising a pigment colorant that has a median particle diameter of less than 150 nm, in an amount of at least 0.1 weight % and up to and including 30 weight %, based on the total weight of the ink jettable and UV-curable composition.
14. The ink jettable and UV-curable composition of claim 1 that comprises a complex of reducible silver ions or silver nanoparticles with the reactive polymer.
15. The ink jettable and UV-curable composition of claim 1 , comprising a complex of silver nanoparticles with the reactive polymer, wherein the silver nanoparticles have an average diameter of at least 2 nm and up to and including 500 nm.
16. The ink jettable and UV-curable composition of claim 1 , comprising a complex of silver nanoparticles with the reactive polymer, wherein the silver nanoparticles have an aspect ratio of less than 2.
17. The ink jettable and UV-curable composition of claim 1 , comprising a complex of silver nanoparticles with the reactive polymer, wherein the silver nanoparticles have an aspect ratio of greater than or equal to 2.
18. The ink jettable and UV-curable composition of claim 1 that comprises a complex of reducible palladium ions or palladium nanoparticles with the reactive polymer.
19. The ink jettable and UV-curable composition of claim 1 that comprises a complex of reducible metal ions or metal nanoparticles with the reactive polymer.