Multilayer film and authentication label
In a first aspect, a multilayer film includes a holographic image layer, a first heat-shrinkable layer and a first adhesive layer between the holographic image layer and the first heat-shrinkable layer. In a second aspect, an authentication label includes a holographic image layer, a first heat-shrinkable layer, a first adhesive layer between the holographic image layer and the first heat-shrinkable layer, and a back adhesive layer.
1. A multilayer film comprising:
a holographic image layer;
a first heat-shrinkable layer;
a first adhesive layer between the holographic image layer and the first heat-shrinkable layer;
a second heat-shrinkable layer adhered to the holographic image layer on a side opposite the first heat-shrinkable layer; and
a third adhesive layer between the holographic image layer and the second heat-shrinkable layer,
and wherein the holographic image layer comprises a volume hologram.
2. The multilayer film of claim 1 , wherein the volume hologram comprises an image recorded in a photopolymer, a silver halide emulsion, a dichromated gelatin, or any combination thereof.
3. The multilayer film of claim 1 , wherein the holographic image layer further comprises a color-tuning layer.
4. The multilayer film of claim 1 , wherein the first heat-shrinkable layer is selected from a polyester film, a polystyrene film, a polylactic acid film, a polyvinyl chloride film, or any combination thereof.
5. The multilayer film of claim 4 , wherein the first heat-shrinkable layer comprises polyethylene terephthalate glycol-modified film as the polyester film.
6. The multilayer film of claim 1 , wherein the first adhesive layer comprises a pressure-sensitive adhesive.
7. The multilayer film of claim 6 , wherein the pressure-sensitive adhesive is selected from an acrylic resin, a rubber-based resin, a silicone resin, or any combination thereof.
8. The multilayer film of claim 1 , wherein the first adhesive layer comprises an ultraviolet-cured adhesive.
9. The multilayer film of claim 1 , further comprising a protective film layer and a second adhesive layer.
10. The multilayer film of claim 9 , wherein the protective film layer comprises polyethylene terephthalate.
11. The multilayer film of claim 9 , wherein the holographic image layer is between the first heat-shrinkable layer and the protective film layer and the second adhesive layer is between the holographic image layer and the protective film layer.
12. The multilayer film of claim 9 , wherein the first heat-shrinkable layer is between the holographic image layer and the protective film layer and the second adhesive layer is between the first heat-shrinkable layer and the protective film layer.
13. The multilayer film of claim 1 further comprising an ink layer.
14. A multilayer film comprising:
a holographic image layer;
a first heat-shrinkable layer;
a first adhesive layer between the holographic image layer and the first heat-shrinkable layer; wherein
on heating, the first heat-shrinkable layer shrivels or shrinks such that at least a part of the holographic image layer is unprotected.
15. The multilayer film of claim 14 , further comprising:
a back adhesive layer, wherein the back adhesive layer is adjacent to a side of the holographic image layer that is opposite the first heat-shrinkable layer and is adhered to a substrate.
16. The multilayer film of claim 14 , wherein the holographic image layer comprises a volume hologram.
17. An authentication label comprising:
a holographic image layer;
a first heat-shrinkable layer;
a first adhesive layer between the holographic image layer and the first heat-shrinkable layer; and
a back adhesive layer, wherein the holographic image layer is between the back adhesive layer and the first adhesive layer, and wherein on heating, the first heat-shrinkable layer shrivels or shrinks such that at least a part of the holographic image layer is unprotected.
18. The authentication label of claim 17 , further comprising a protective film layer and a second adhesive layer, wherein the second adhesive layer is between the protective film and a side of the first heat-shrinkable layer that is opposite the first adhesive layer.
19. The authentication label of claim 17 further comprising a first ink layer between the holographic image layer and the back adhesive layer and a second ink layer on an exterior surface of the first heat-shrinkable layer.
20. The authentication label of claim 19 , wherein the back adhesive layer is adjacent to the side of the holographic image layer that is opposite the first heat-shrinkable layer and is adhered to a substrate.
21. The authentication label of claim 19 , wherein the holographic image layer comprises a volume hologram.
22. The authentication label of claim 21 , wherein the volume hologram comprises an image recorded in a photopolymer, a silver halide emulsion, a dichromated gelatin, or any combination thereof.
23. The authentication label of claim 17 , wherein the holographic image layer further comprises a color-tuning layer.
24. The authentication label of claim 17 , wherein the first heat-shrinkable layer is selected from a polyester film, a polystyrene film, a polylactic acid film, a polyvinyl chloride film, or any combination thereof.
25. The authentication label of claim 24 , wherein the first heat-shrinkable layer comprises a polyethylene terephthalate glycol-modified film as the polyester film.
26. The authentication label of claim 17 , wherein the first adhesive layer comprises a pressure-sensitive adhesive.