Material for forming images by inkjet printing
The present invention relates to a material intended for forming images by inkjet printing having good stability to ozone and to light as well as a uniform surface, to obtain a high-quality printed image. The material comprises a support and at least one ink-receiving layer, wherein the ink-receiving layer comprises at least one polysaccharide, such as carrageenan, and at least one hydriphillic polymer having hydroxyl groups, such as polyvinyl alcohol and guar gum, and inorganic particles having a neutral or positive surface charge.
1. A material intended for forming images by inkjet printing, comprising a support and at least one ink-receiving layer, wherein said at least one ink-receiving layer comprises carrageenan, a mixture of hydrophilic polymers comprising hydroxyl groups comprising polyvinyl alcohol and guar gum, and inorganic particles having a neutral or positive surface charge, wherein said ink-receiving layer comprises from 80 to 99% by weight of inorganic particles compared with the total weight of the ink-receiving layer.
2. The material of claim 1 wherein said carrageenan is capable of thermoreversible gelation.
3. The material of claim 1 wherein said carrageenan is at least one member selected from the group consisting of κ-carrageenan, ι-carrageenan or a combination thereof.
4. The material of claim 1 wherein said carrageenan comprises at least 80% of κ-carrageenan.
5. The material of claim 1 wherein said carrageenan is a pure κ-carrageenan.
6. The material of claim 1 wherein the weight ratio of guar gum to carrageenan is between 1:20 and 1:5.
7. The material of claim 1 wherein said ink-receiving layer comprises from 0.1 to 3% solids by weight of carrageenan.
8. The material of claim 1 wherein said ink-receiving layer comprises from 0.15 to 0.4% solids by weight of carrageenan.
9. The material of claim 1 wherein said polyvinyl alcohol has a molecular weight greater than 55,000.
10. The material of claim 1 wherein said ink-receiving layer comprises from 0.5 to 20% by weight of polymer comprising hydroxyl groups.
11. The material of claim 1 wherein said ink-receiving layer comprises from 3 to 10% by weight of polymer comprising hydroxyl groups.
12. The material of claim 1 wherein said ink-receiving layer comprises from 90 to 97% by weight of inorganic particles compared with the total weight of the receiving layer.
13. The material of claim 1 wherein said inorganic particles having a neutral surface charge comprise at least one member selected from the group consisting of calcium carbonate and barium sulfate.
14. The material of claim I wherein said inorganic particles having a positive surface charge comprise at least one member selected from the group consisting of zinc oxides, aluminas, zeolites, aluminosilicates, and modified silicas.
15. The material of claim 1 , wherein the ink-receiving layer comprises from 0.5 to 15% by weight of polyvinyl alcohol and from 0.1 to 3% by weight of carrageenan, and wherein the weight ratio of guar gum to carrageenan is between 1:20 and 1:5.