| 摘要 |
<p>A retroreflection sheet for security whose forgery is difficult, which retroreflection sheet for security cannot be reused once peeling is made and permits not only viewing of printed images without influence from sticking objects such as a colored glass but also clearly viewing thereof even in the night; and a process for producing the same. There is provided a retroreflection sheet for security comprising, arranged in the following sequence, surface layer (1), binder layer (2), high-refractive-index glass beads (3), printed resin layer (4), focal point layer (5), metal layer (6) and adhesive layer (7), characterized in that the printed resin layer (4) provides a mark, the high-refractive-index glass beads (3) arranged within the binder layer (2), and that the position of high-refractive-index glass beads (3) disposed would not overlap with the position of printed resin layer (4) when observation is made in the direction of the thickness of the retroreflection sheet for security from the side of surface layer (1), the printed resin layer (4) consisting of a composition composed mainly of an ordinary-temperature-hardening resin.</p> |
