Methods of manufacturing embossing elements

1. A method of manufacturing an embossing element for decorative surfaces, the method comprising the steps of:

inkjet printing a UV curable inkjet ink to form a decorative pattern on a metallic surface; and

forming a relief by etching metal from the metallic surface; wherein

the UV curable inkjet ink includes:

one or more photoinitiators;

optionally, a colorant that decolorizes at a pH of more than 10;

(a) one or more hydrolyzable polyfunctional monomers including at least one alkali hydrolyzable group located in an atomic chain between two polymerizable groups of the hydrolyzable polyfunctional monomer, or (b) one or more hydrolyzable polyfunctional oligomers including at least one alkali hydrolyzable group located in an atomic chain between two polymerizable groups of the hydrolyzable polyfunctional oligomer; and

one or more water absorption controlling monomers that are a monofunctional or difunctional monomer including at least one functional group selected from the group consisting of a hydroxyl group, an ethylene oxide or oligo-ethylene oxide group, a tertiary amine group, an acidic group having a pK a not lower than 3, and a five to seven membered aromatic or non aromatic heterocyclic group; and

the at least one alkali hydrolyzable group located in the atomic chain between two polymerizable groups of the polyfunctional monomer or oligomer is selected from the group consisting of Formulas H-1 to H-4:

wherein

Q represents the necessary atoms to form a five membered aromatic ring group;

Z represents the necessary atoms to form a five or six membered ring group; and

the dashed lines represents the bonds to the rest of the polyfunctional monomer or oligomer.

2. The method according to claim 1 , further comprising the step of:

stripping the decorative pattern from the metallic surface with an alkaline solution.

3. The method according to claim 2 , wherein the decorative pattern is dissolved in the alkaline solution.

4. The method according to claim 1 , wherein the embossing element has a plate shape or a substantially plate shape.

5. The method according to claim 1 , wherein the embossing element has a belt shape or a substantially belt shape.

6. The method according to claim 1 , further comprising the step of:

curing the UV curable inkjet ink with LEDs.

7. A method for manufacturing an embossed decorative surface including the steps of:

manufacturing the embossing element according to claim 1 ;

inkjet printing on a substrate a second decorative pattern corresponding to the relief of the embossing element; and

heat pressing the embossing element onto a laminate assembly including the substrate with the second decorative pattern in register with the relief of the embossing element.

8. The method according to claim 7 , wherein the laminate assembly includes one or more resin impregnated papers.

9. The method according to claim 8 , wherein the one or more resin impregnated papers include a thermosetting resin selected from the group consisting of melamine-formaldehyde based resins, ureum-formaldehyde based resins, and phenol-formaldehyde based resins.

10. The method according to claim 7 , wherein the laminate assembly includes one or more thermoplastic foils.

11. The method according to claim 10 , wherein the one or more thermoplastic foils includes a polyvinylchloride foil.

12. The method according to claim 7 , wherein the decorative surface is a decorative panel including a tongue and groove joint.

13. The method according to claim 1 , wherein the at least one alkali hydrolyzable group is an oxalate ester group.