Patent ID: 7709417

Claim:
A security sticker, comprising: a surface resin layer that has a weak affinity with a sublimable dye and allows the dye to penetrate; a print layer that has an affinity with the dye and comprises an image formed in a thickness direction of the layer by the dye; a self-destructive film element; and a pressure-sensitive adhesive layer in this order, wherein the self-destructive film element comprises at least a dye migration preventive resin layer for preventing migration of the dye and a self-destructive layer, the print layer contains a low-molecular-weight compound with a molecular weight of 1300 or less in an amount of 0% to 20 wt % inclusive, the dye migration preventive resin layer is a resin layer containing a vinyl resin with a glass transition temperature (Tg) of 70° C. or more and a SP value of 9.0 or more as a main component, or is a biaxially stretched film that is stretched by 10% or more in a winding direction and in a width direction respectively, the film having a shrinkage ratio of 1.0% or less in the winding direction after being heated at 150° C. for 30 minutes.