Patent ID: 8857856

Claim:
A security foil comprising: a) a first carrier substrate; b) a first radiation-curable lacquer layer into which an optically active structure is introduced, the first radiation-curable lacquer layer being disposed on the first carrier substrate, and the first radiation-curable lacquer layer containing two or more different photo-initiators and being a water-dilutable lacquer or being based on a polyester, an epoxy or polyurethane system; c) a first metallic layer disposed on the first radiation curable lacquer layer; d) a first protective lacquer layer disposed on the first metallic layer; e) an adhesive layer disposed on the first protective lacquer layer; f) a second carrier substrate disposed on the adhesive layer; g) a second radiation-curable lacquer layer disposed on the second carrier substrate; h) a second metallic layer disposed on the second radiation-curable lacquer layer; i) a second protective lacquer layer disposed on the second metallic layer; and j) an adhesive coating disposed on the second protective lacquer layer, wherein one of the following conditions is satisfied: (i) adhesion between the layers g) and h) is significantly lower than adhesion between the remaining layers, and the second carrier substrate f) is an acrylate-coated plastic film or a foil provided with an adhesion promoter; and (ii) adhesion between the layers f) and g) is significantly lower than adhesion between the remaining layers, and the second carrier substrate f) is a plastic film made of PI, PP, MOPP, PE, PPS, PEEK, PEK, PEI, PSU, PAEK, LCP, PEN, PBT, PET, PA, PC, COC, POM, ABS, PVC, or fluoropolymers, and wherein the first metallic layer and the second metallic layer are superimposed in such a way that the second metallic layer is visible only after the first metallic layer is separated from the second metallic layer.