Transfer paper for sublimation printing, comprising an alkaline earth salt

1. Transfer paper comprising a fibrous substrate and directly applied on at least one side of the fibrous substrate, a composition comprising an alkaline earth salt selected from calcium dichloride, calcium nitrate, magnesium sulphate and magnesium chloride wherein the transfer paper is a sublimation printing transfer paper and is free of calcium sulfate and barium sulfate.

2. Transfer paper according to claim 1 , the alkaline earth salt(s) being present on the said side in a quantity equal to or greater than 0.2 g/m 2 .

3. Transfer paper according to claim 1 lacking other surface treatment formulation ingredients on the side containing the alkaline earth salt(s).

4. Transfer paper according to claim 1 , wherein the transfer paper is printable by inkjet printing.

5. Transfer paper according to claim 1 having a Bendtsen air permeability equal to or greater than 100 ml/min (ISO 5636-3).

6. Transfer paper according to claim 1 having a paper weight between 25 and 150 g/m 2 .

7. Manufacturing process for a transfer paper for sublimation printing, according to claim 1 , wherein a surface treatment is used to deposit, on at least one side of a fibrous substrate, one or more alkaline earth salts or one or more compounds which, in the presence of one or more other compounds carried by the fibrous substrate, form one or more alkaline earth salts in situ.

8. Manufacturing process for a transfer paper according to the preceding claim, wherein the fibrous substrate is manufactured and the surface treatment applied in-line or off-line.

9. Manufacturing process for a transfer paper according to claim 7 , wherein surface treatment deposits a composition containing alkaline earth salt(s) on the said side of the fibrous substrate.

10. Manufacturing process for a transfer paper according to the preceding claim, wherein the quantity of the composition deposited on the side of the fibrous substrate is between 0.2 and 15 g/m 2 by dry weight, preferably between 0.5 and 8 g/m 2 .

11. Manufacturing process for a transfer paper according to claim 7 , wherein the surface treatment is applied using a size press, a film transfer press or a coating system, in particular a knife coating, air knife coating, crayon or curtain, or by engraved cylinder.

12. Transfer paper printed by sublimation printing, containing a transfer paper according to claim 1 and wherein at least one print on the side of the transfer paper contains the alkaline earth salt(s).

13. Process for printing transfer paper for sublimation printing, in which at least one ink is used to print, in particular by inkjet printing, the side containing the alkaline earth salt(s) of a transfer paper according to claim 1 .

14. Process for decorating a support, wherein the printing on a transfer paper printed according to claim 12 is transferred to the support by sublimation.

15. Transfer paper according to claim 1 wherein the composition containing the alkaline earth salt is free of binder.

16. Transfer paper according to claim 1 wherein the composition containing the alkaline earth salt is free of mineral filler.

17. Transfer paper according to claim 1 wherein the composition containing the alkaline earth salt comprises 10 to 100 weight percent of the alkaline earth salt.

18. Transfer paper according to claim 1 wherein the composition containing the alkaline earth salt comprises 40 to 100 weight percent of the alkaline earth salt.