Method of producing decorative paper and decorative laminate comprising such decorative paper
The invention relates to a method of producing decorative paper which is coated with at least one ink-fixing layer, which is printable and which can be impregnated with a thermosetting resin, in order to produce a high- or low-pressure decorative laminate. The inventive method comprises the following steps consisting in: (a) producing a base sheet of decorative paper using paper-making means; and (b) coating at least one of the faces of the base paper sheet with said at least one ink-fixing layer, by means of curtain coating. The invention also relates to high- or low-pressure decorative laminates comprising such decorative paper.
1. A process of producing a decorative paper coated with at least one ink-fixing layer, printable by ink jet printing and capable of being impregnated with a thermosetting resin, for a high- or low-pressure decorative laminate, comprising:
a. producing a sheet of base decor paper by paper making route, then
b. coating at least one of the faces of said sheet of base decor paper by curtain coating with at least said ink-fixing layer,
the coated paper sheet having a resin-impregnation speed of less than 100 seconds whatever its face.
2. The process as claimed in claim 1 , wherein the layer is not alkaline.
3. The process as claimed in claim 2 , wherein the layer is free from carbonates and alkaline buffers.
4. The process as claimed in claim 1 , wherein the layer contains coating fillers chosen substantially from silicas.
5. The process as claimed in claim 4 , wherein said silicas are essentially precipitated amorphous silicas.
6. The process as claimed in claim 1 , wherein the quantity of layer deposited is comprised between 4 and 20 g/m 2 , in particular between 6 and 15 g/m 2 by dry weight.
7. The process as claimed in claim 1 , wherein said process includes a printing step of the paper sheet coated with at least one ink-fixing layer coming from step b of said process.
8. The process as claimed in claim 7 , wherein said ink-fixing layer is printed by ink jet printing.
9. The process as claimed in claim 7 , wherein the printing step of the paper sheet coated with at least one ink-fixing layer coming from step b of said process includes printing of a decorative pattern.
10. The process as claimed in claim 1 , wherein the sheet of base decor paper has a Bekk smoothness of 20 to 140 seconds before being coated.
11. The process as claimed in claim 1 , wherein the ink-fixing layer contains at least one hydrophilic binder.
12. The process as claimed in claim 11 , wherein said layer contains, in addition to said hydrophilic binder, a non-hydrophilic polymeric binder in a ratio of hydrophilic binder/non-hydrophilic binder of at least 70/30 by dry weight.
13. The process as claimed in claim 11 , wherein the hydrophilic binder is a polyvinyl alcohol (PVA).
14. The process as claimed in claim 1 , wherein the coated paper sheet has an impregnation speed of from 40 to 60 seconds.
15. A process for producing an impregnated decorative paper for decorative laminates, comprising impregnating a printed decorative paper obtained by the process as claimed in claim 7 with a thermosetting resin.
16. The process as claimed in claim 15 , wherein the thermosetting resin is chosen from melamine-formaldehyde resins, urea-formaldehyde resins, benzoguanamine-formaldehyde resins, unsaturated polyester resins and mixtures thereof.
17. A process of impregnating a coated paper sheet for a decorative paper for use in a high- or low-pressure decorative laminate, comprising:
impregnating at least one face of a sheet of coated base decor paper with a thermosetting resin, wherein at least one of the faces of said sheet of base decor paper is coated with at least one ink-fixing layer, the coated paper sheet being printable by inkjet printing and having a resin-impregnation speed of less than 100 seconds whatever its face.