| 摘要 |
<p>The invention relates to a multi-layer, opaque, biaxially oriented polyolefin film having a thickness of at least 30µm comprising a vacuole-containing base layer and, applied on both sides thereof, intermediate layers and cover layers. Both intermediate layers have a thickness of at least 3µm and contain at least 70 wt.-% of a propylene homopolymer. Both cover layers are composed of incompatible polymers. The inner cover layer has a surface roughness Rz of at least 3.0µm and the outer cover layer has a roughness of 1 to 3µm, wherein the roughness of the inner cover layer is at least 1.5 units greater than the roughness of the outer cover layer.</p> |
