| 摘要 |
<p>A retroreflective article that comprises: (a) a retroreflective layer having first and second major surfaces; and (b) a cover layer juxtaposed against the first major surface, characterized in that: the cover layer comprises a surface layer, an optional intermediate layer, and a back layer, with the provisos that: (i) when the intermediate layer is present in the cover layer the intermediate layer contains a vinylidene fluoride base polymer as a primary component, and the surface layer and back layer each comprise a methyl methacrylate base polymer as a primary component; and (ii) when the intermediate layer is absent from the cover layer, the surface layer comprises a methyl methacrylate base polymer (A) and a vinylidene fluoride base polymer (F) in a weight ratio A:F of 55:45 to 95:5, and the back layer comprises a methyl methacrylate base polymer and a vinylidene fluoride base polymer with the vinylidene fluoride base polymer being the primary component.</p> |
