| abstract |
The invention describes a novel polyester raw material and the production and use of an oriented, single- or multilayer film having an overall thickness of </=4 mu m and a roughness on at least one film surface of Ra<30 nm, where the surface gas-flow resistance on at least one film surface is t</=axdb [sec], where a=0 to 10,000 [sec/ mu m], b=3.0 to 0, and d (overall film thickness)</=4 mu m. The film contains first (I) and second (II) particles. The first particles are monodisperse and have an aspect ratio of 1.0-1.2. |