Patent ID: 9533476
Date: 2017-01-03
CPC Classifications: B32B,Y10T

Claim:
1. A multi-layer, opaque, biaxially-oriented polyolefin film with a thickness of at least 40 μm comprising: a vacuole-containing base layer B and intermediate layers applied on both sides thereof and covering layers on both sides thereof, wherein both intermediate layers have a thickness of at least 3 μm up to 10 μm and contain at least 70% by weight of a propylene homopolymer, and both covering layers are constructed of a mixture of incompatible polymers, both covering layers have a thickness of at least 2 to 10 μm, both covering layers have a surface roughness Rz of at least 2.5 μm up to 8 μm and both covering layers contain less than 2% by weight of particle-shaped fillers.