Image destruct feature used with image receiving layers in secure documents
View Patent ↗An image destruct material comprises a release layer positioned between an image receiving layer and a base layer. The adhesion between the release layer and the base layer is greater than adhesion between the release layer and the image receiving layer. The release layer material can be used in secure documents that have an image receiving layer. After information is printed on the image receiving layer, an overlaminate is applied over it. Removal of the overlaminate destroys the printed image on the receiving layer because of the relative adhesive properties of the image receiving layer, overlaminate and release layer.
1. A method for making an identification document comprising:
providing a base layer;
applying a release layer over the base layer, the release layer being applied in a pattern and the pattern covering less than the entire base layer;
applying an image receiving layer over the base layer and the release layer, wherein the image receiving layer is in direct contact with the base layer except where the image receiving layer contacts the pattern of the release layer; and
applying an overlaminate over the image receiving layer, wherein (a) the adhesion of the release layer to the base layer is greater than the adhesion of the release layer to the image receiving layer; and (b) the adhesion of the image receiving layer to the base layer is equal to or greater than the adhesion of the release layer to the base layer; and (c) the adhesion of the overlaminate to the image receiving layer is greater than the adhesion of the image receiving layer to the release layer, such that removal of the overlaminate causes an image printed on the image receiving layer to separate with the overlaminate in the area of the release layer while the image printed on the image receiving layer remains with the base layer outside the area of the release layer.
2. The method of claim 1 wherein the image receiving layer comprises a D2T2 image receiving layer.
3. The method of claim 1 wherein the release layer comprises a water soluble polymer and a solvent soluble polymer, and the release layer includes a material to mitigate swelling or softening in response to applying the image receiving layer on the release layer.
4. The method of claim 1 comprising:
curing the release layer on the base layer.
5. The method of claim 1 wherein the release layer comprises hydroxypropylcellulose and polyamide.
6. The method of claim 1 wherein the release layer comprises a UV curable formulation.
7. The method of claim 1 wherein the UV curable formulation forms a raised pattern.
8. The method of claim 7 wherein the raised pattern of the release layer forms a raised pattern in an overlaminate layer when overlaminated.
9. The method of claim 1 wherein the image receiving layer is deposited using a solvent, and the release layer includes a material to reduce swelling or softening of the release layer by the image receiving layer.
10. The method of claim 1 wherein the image receiving layer comprises a thermal transfer image receiving layer.
11. The method of claim 1 wherein the image receiving layer comprises a polymer, the base layer comprises a polymer, and the release layer includes at least first and second polymers.
12. The method of claim 11 wherein the image receiving layer comprises a PVC, and the base layer comprises a polycarbonate, a PVC or a polyester.
13. The method of claim 11 wherein the first polymer of the release layer comprises cellulose, and the second polymer comprises a polyamide, polyurethane, polystyrene or polyacrylate.
14. The method of claim 11 wherein the first polymer of the release layer is selected from one of polyvinyl alcohol, polysaccharide, cellulose, cellulose acetate butyrate, polyvinyl/butyrate and hydroxypropyl cellulose.
15. The method of claim 14 wherein the second polymer of the release layer is selected from one of polyamide, polyurethane, polystyrene and polyacrylate.
16. The method of claim 11 wherein the first and second polymers of the release layer comprise hydroxypropyl cellulose and polyamide.
17. The method of claim 16 wherein the ratio of polyamide to hydroxypropyl cellulose is in the range of 8/20 to 20/80, respectively.
18. The method of claim 11 wherein the release layer comprises about 2.5% hydroxypropyl cellulose by weight, about 2.5% polyamide by weight, about 45% iso propanol alcohol by weight and about 45% n-propanol alcohol by weight.
19. The method of claim 11 wherein the release layer is from about 0.01 microns to about 1 micron in thickness.
20. The method of claim 11 wherein the release layer further comprises a monolayer surfactant selected from one of PPO, PEO homo and PPO-PEO polymers.