A fast drying inkjet medium comprising at least one cationic archival layer and at least one anionic or non-ionic fast-dry overcoat layer.
Description
BRIEF DESCRIPTION OF THE DRAWING FIGURES
In the drawings that illustrate the best mode presently contemplated for carrying out the present invention, FIG. 1 is a schematic illustration of the coating layers on the media.
Claims
1. An inkjet medium comprising:
a) a substrate having an imaging surface;b) at least one cationic archival layer overlaying the imaging surface of the substrate; andc) at least one anionic fast-dry overcoat layer overlying the cationic archival layer.
2. The inkjet medium of claim 1 wherein the cationic archival layer comprises at least one cationic component selected from the group comprising cationic binders, cationic pigments and mordants.
3. The inkjet medium of claim 2 wherein the cationic component in the cationic archival layer is selected from the group consisting of cationic polymers, water soluble metal salts, cationic organic particles and cationic inorganic particles.
4. The inkjet medium according to claim 3 wherein the cationic component is selected from the group comprising cationic polyurethane containing quaternary ammonium groups, cationic polyacrylates, quaternary ammonium salt of polyethylene imine, polydiallyamine or an alkylamine polymer, polydimethylaminoethyl-methacrylate quaternary salts, polystyrene quaternary ammonium salts, polydiallydimethyl ammonium salts, polypyridine and water soluble metal salts.
5. The inkjet medium according to claim 1 wherein the anionic overcoat layer is selected from the group comprising anionic polymers, anionic organic particles and anionic inorganic particles.
6. The inkjet medium according to claim 5 wherein the anionic overcoat layer contains at lkeast one component selected from the group consisting of precipitated silica, fumed silica, gel silica, sol silica, colloidal silica, organic particles of polyurethane, polyacrylates, polyvinyl acetate, EVA and EAA.
7. The inkjet medium according to claim 1 wherein the cationic archival layer and the anionic fast-dry overcoat layer comprise water swellable polymers.
8. The inkjet medium according to claim 7 wherein the cationic archival layer and the anionic overcoat layer are water swellable and the anionic fast-dry overcoat layer is less water swellable than the cationic archival layer.
9. The inkjet medium of claim 8 wherein the water swellable polymer in the cationic archival layer is selected from the group comprising poly(vinyl alcohol), cellulose derivatives, gelatins, polyvinyl acetal, poly(vinyl acetate), poly(acrylic acid), poly(ethylene oxide), alginates, water-soluble gums, or starch, preferably poly(vinyl alcohol), gelatins, polyvinyl acetal and poly(vinyl acetate).
10. The inkjet medium of claim 8 wherein the water swellable polymer in the anionic overcoat layer is selected from the group comprising polyurethane, polyacrylates, polyvinyl acetate, EVA, EAA. Suitable polymer resins may include cellulose and cellulose derivatives, PVOH, polyurethane, polyacrylates, polyvinyl acetate, EVA, EAA, PVP, PEOX, PEO and PEO-PPO.
11. The inkjet medium of claim 10 wherein the anionic overcoat layer comprises an anionic cellulose derivative and anionic silica.
12. The inkjet medium according to claim 1 wherein the cationic archival layer contains at least one polymer having a solubility for any co-solvent in the ink.
13. The inkjet medium according to claim 12 wherein the polymer is selected from the group comprising polyurethane, PVP, PEOX, PEO, PEO-PPO, cellulose derivatives, polyacrylates, poly(ethylene-co-acrylic acid), poly(ethylene-co-vinyl acetate), polyacetate, polyvinyl acetate and gelatins.
14. The inkjet medium according to claim 1 wherein the anionic fast dry overcoat layer has less swellability than the archival under layer for the co-solvent.
15. The inkjet medium according to claim 12 where in the ink is a pigment ink.
16. The inkjet medium according to claim 1 wherein the cationic archival layer contains at least one cationic species selected from the group consisting of cationic polyurethanes and cationic polyacrylates and the anionic overcoat layer contains at least one anionic species selected from the group consisting of anionic silica and water soluble anionic polymers.
17. The inkjet medium according to claim 16 wherein the cationic archival layer is a mixture of cationic polyurethane and polyvinyl alcohol and the anionic overcoat layer is a mixture of anionic silica and anionic cellulose derivative.
18. The inkjet medium according to claim 1 wherein the anionic overcoat layer has a coating weight between about 1 g/m2 and about 10 g/m2 and the cationic archival layer has a coating weight between about 2 g/m2 and about 20 g/m2.
19. An inkjet medium comprising:
a) a substrate having an imaging surface;b) at least one fast dry undercoat fast-dry layer overlaying the imaging surface of the substrate;c) at least one cationic archival layer overlaying on the imaging surface of the anionic fast dry undercoat layer; andd) at least one anionic fast-dry overcoat overlying the cationic archival layer.
20. The inkjet medium of claim 19 wherein the fast dry undercoat layer is selected form the group consisting of UV-cured layers, a microporous layers and anionic layers.
21. The inkjet medium of claim 19 wherein a barrier layer is place on the substrate before the fast dry undercoat layer.
22. An inkjet medium comprising:
a) a substrate;b) at least one cationic archival layer coated on the substrate; andc) at least one non-ionic fast dry overcoat layer coated on the cationic archival layer.
23. The inkjet medium of claim 22 wherein the cationic layer comprises at least one cationic component selected from the group consisting of cationic binders, cationic pigments and cationic mordants.
24. The inkjet medium of claim 23 wherein the cationic component is selected from the group consisting of cationic polymers, water soluble metal salts, cationic organic particles and cationic inorganic particles.
25. The inkjet medium according to claim 24 wherein the cationic component is selected from the group comprising cationic polyurethane containing quaternary ammonium groups, cationic polyacrylates, quaternary ammonium salt of polyethylene imine, polydiallyamine or an alkylamine polymer, polydimethylaminoethyl-methacrylate quaternary salts, polystyrene quaternary ammonium salts, polydiallydimethyl ammonium salts, polypyridine and water soluble metal salts.
26. The inkjet medium according to claim 22 wherein the cationic archival layer and the nonionic fast-dry overcoat layer are water swellable.
27. The inkjet medium of claim 26 wherein the cationic archival layer and the nonionic fast-dry overcoat layer comprise water swellable polymers and the nonionic fast-dry overcoat is less water swellable than the cationic archival layer.
28. The inkjet medium according to claim 22 wherein the nonionic fast dry layer is a nonionic binder polymer and at least one nonionic particle selected from the group consisting of nonionic organic and nonionic inorganic particles.
Patent Application
20070202280
