Biaxially oriented polyester film having good oxygen barrier properties, method for producing the same and its use

摘要

Biaxially oriented, co-extruded polyester film has a base layer of NOTLESS 80 wt.% thermoplastic polyester (I) and coating(s).≥1 Outside layer is not free from inert particles and is coated with a metal or ceramic layer. This outside layer has a number N of protrusions per mm<2> film surface area, which have heights h and diameters d correlated by the equations (1) and (2): log N/mm<2>≤Ah-Bh<*>log h/ mu m, 0.01 mu m h 10 mu m Ah = 1.4; Bh = 2.5 (1); log N/mm<2>≤Ad-Bd<*>log d/ mu m, 0.01 mu m d 10 mu m Ad = 3.4; Bd = 2.4 (2). Also claimed is a method of making the film.