Radiation curable inkjet inks for interior decoration

1. A radiation curable inkjet ink comprising:

a polymerizable compound including a vinylether group or a vinylamide group; optionally an amine synergist including an alkanolamine group or a dimethyl benzoate group; optionally a Norrish Type II photoinitiator including a photoinitiating moiety selected from the group consisting of a thioxanthone group, a benzophenone group, a ketocoumarin group, and a camphorquinone group; and

a singlet oxygen quencher according to Formula (I):

wherein

the integer n=0 if X represents S or the integer n=1 if X represents N;

R1 and R2 each represent an alkyl group independently selected from a C 1 -C 6 alkyl group;

R3 represents a C 1 -C 6 alkyl group or a -L4-(C═O)—O—R5 group;

R4 represents a C 1 -C 6 alkyl group or a -L5-(C═O)—O—R6 group;

L1 to L5 each represent an alkylene group independently selected from an ethylene group, a propylene group and a butylene group; and

R5 and R6 each represent an alkyl group independently selected from a C 1 -C 6 alkyl group.

2. The radiation curable inkjet ink of claim 1 , wherein L1 to L5 represent an ethylene group.

3. The radiation curable inkjet ink of claim 1 , wherein R1 to R6 represent an ethyl group.

4. The radiation curable inkjet ink of claim 1 , wherein the singlet oxygen quencher is selected from the group consisting of:

5. The radiation curable inkjet ink of claim 1 , wherein the radiation curable inkjet ink contains a Norrish Type II photoinitiator including a photoinitiating moiety selected from the group consisting of a thioxanthone group and a benzophenone group.

6. The radiation curable inkjet ink of claim 1 , wherein the polymerizable compound containing a vinylether group is a vinyl ether acrylate compound or the polymerizable compound containing a vinylamide group is N-vinylcaprolactam.

7. The radiation curable inkjet ink of claim 6 , wherein the vinyl ether acrylate compound is 2-(2-vinyloxyethoxy)ethyl acrylate.

8. The radiation curable inkjet ink of claim 1 , further containing an acylphosphine oxide photoinitiator or an α-hydroxy ketone photoinitiator.

9. The radiation curable inkjet ink of claim 8 , wherein the one or more acyl groups of the acylphosphine oxide photoinitiator or α-hydroxy ketone photoinitiator are connected to a polymer or to a polymerizable group.

10. A radiation curable inkjet ink set including one or more radiation curable inkjet inks according to claim 1 .

11. An indoor decorative article including a cured layer of one or more radiation curable inkjet inks according to claim 1 , wherein the indoor decorative article is selected from the group consisting of decorative panels, furniture, wallpaper, doors, leather articles, and textile fabrics.

12. An inkjet printing method including the steps of:

printing one or more radiation curable inks according to claim 1 on a substrate; and

UV curing the one or more curable inks on the substrate.

13. The inkjet printing method of claim 12 , wherein the UV curing is performed by UV LEDs having an emission wavelength larger than 360 nm.

14. A method of manufacturing indoor decorative articles, the method comprising the inkjet printing method according to claim 12 .

15. A method of manufacturing indoor decorative articles, the method comprising the inkjet printing method according to claim 13 .

16. The manufacturing method of claim 14 , wherein the indoor decorative article is selected from the group consisting of decorative panels, furniture, wallpaper, doors, leather articles, and textile fabrics.

17. The manufacturing method of claim 15 , wherein the indoor decorative article is selected from the group consisting of decorative panels, furniture, wallpaper, doors, leather articles, and textile fabrics.