| 摘要 |
PROBLEM TO BE SOLVED: To make a laminate thermally irreversible and thereby prevent forgery from being easily committed by forming a barrier layer between a polyethylene- containing layer and an adhesive layer. SOLUTION: A barrier layer is formed between a polyethylene-contained layer and an adhesive layer. A first layer is made up of a transparent and pliable support, which is most preferably formed of a polyethylene terephthalate with 30-250 μm thickness, one of the faces of which is made to adhere to the polyethylene-contained layer. The polyethylene-contained layer is preferably 50-200 μm thick and an adhesive is a two-component polyurethane mixture, preferably with 1-10 μm thickness. The barrier layer is most preferably a transparent plastic layer consisting of the polyethylene terephthalate with 5-35 μm thickness. On one or both faces of the carrier layer, it is possible to print in pastel color, for example, using an UV ink, an optically changeable ink or an optically changeable coloring material. |
