| 摘要 |
<p>A retroreflective sheeting has a multitude of retroreflective elements (10) that include a layer of optical elements (1) and a reflective element(s) (2) that is positioned functionally behind the optical elements (1). The retroreflective elements (10) are supported by a polymeric layer (3), and a pressure-sensitive adhesive layer (4) positioned below the support layer. The adhesive layer (4) contains a polyurethane crosslinked by at least an isocyanate compound. The polyurethane is polymerized from a component containing a polyol having at least one alkyl side chain in a molecule, and the adhesive has (i) a storage module of about 2 x 107 to 8 x 107 dyne per square centimeter when measured in a tensile mode at a frequency of 35 Hz and 25 °C, and (ii) a softening point of about 80 °C to less than 200 °C.</p> |
