Security document having enhanced foil durability
A security document, along with its methods of formation, is provided. The security document may include a base sheet, a colored coating on the base sheet, a foil laminate on at least a portion of the colored coating, and an outer lacquer coating over the colored coating such that the foil laminate is embedded between the colored coating and the outer lacquer coating. The outer lacquer coating may include a polymeric resin, and may also include a crosslinking agent and a wetting agent.
1. A security document, comprising:
a base sheet;
a colored coating on said base sheet;
a foil laminate on at least a portion of the colored coating, wherein the foil laminate comprises an adhesive layer, a foil sheet, and a lacquer layer, and wherein the adhesive layer is positioned on the colored coating, and wherein the foil sheet is positioned between the adhesive layer and the lacquer layer; and
an outer lacquer coating over the colored coating such that the foil laminate is embedded between the colored coating and the outer lacquer coating, wherein the outer lacquer coating comprises a polymeric resin.
2. The security document of claim 1 , wherein the polymeric resin includes an acrylic, acrylate, polyurethane, polysilicone, polysiloxane, a nitrocellulosic material, polytetrafluoroethylene, polyvinyl acetate, or copolymers thereof, or blends thereof.
3. The security document of claim 1 , wherein the polymeric resin of the outer lacquer coating comprises a water-based polyacrylic and a water-based polysiloxane, and wherein the outer lacquer coating further comprises a crosslinking agent and a wetting agent.
4. The security document of claim 3 , wherein the water-based polyacrylic is included in the outer lacquer coating at a concentration of about 80% to about 95% by weight, wherein the water-based polysiloxane is included in the outer lacquer coating at a concentration of about 5% to about 15% by weight, and wherein the crosslinking agent is included in the outer lacquer coating at a concentration of about 0.5% to about 5% by weight, and further wherein the wetting agent is included in the outer lacquer coating at a concentration of about 0.5% to about 5% by weight.
5. The security document of claim 3 , wherein the crosslinking agent comprises polyaziridine.
6. The security document of claim 1 , wherein the outer lacquer coating comprises an outer surface having an embossed profile.
7. The security document of claim 1 , wherein the outer lacquer coating covers the entire colored coating.
8. The security document of claim 1 , wherein the foil laminate covers only a portion of the colored coating.
9. The security document of claim 1 , wherein the colored coating comprises a surface on which the foil laminate is positioned, and wherein the surface of the colored coating comprises an embossed profile.
10. The security document of claim 1 , wherein the colored coating comprises a colored agent dispersed within a polymeric matrix.
11. The security document of claim 1 , wherein the foil laminate has a thickness of about 5 μm to about 15 μm.
12. The security document of claim 1 , wherein the foil sheet of the foil laminate includes at least one non-transparent metal material.
13. The security document of claim 1 , wherein the foil sheet of the foil laminate comprises a foil of aluminum.
14. The security document of claim 1 , wherein the foil sheet of the foil laminate has a thickness that is about 1 μm or less.
15. The security document of claim 1 , wherein the lacquer layer is positioned between the foil sheet and the outer lacquer coating.
16. A method of forming a security document, the method comprising:
forming an outer lacquer coating over a foil laminate adhered to a colored coating of a base sheet such that the foil laminate is embedded between the colored coating and the outer lacquer coating,
wherein the foil laminate comprises an adhesive layer, a foil sheet, and a lacquer layer, and wherein the adhesive layer is positioned on the colored coating, and wherein the foil sheet is positioned between the adhesive layer and the lacquer layer.
17. The method of claim 16 , further comprising: embossing the outer lacquer layer.
18. A method of forming a security document, the method comprising:
embedding a foil laminate between a base sheet and an outer lacquer coating,
wherein the foil laminate comprises an adhesive layer, a foil sheet, and a lacquer layer, and wherein the base sheet comprises a colored coating on which the foil laminate is adhered and the outer lacquer coating is applied over the foil laminate and the colored coating.