Patent ID: 6194054
Filing Date: 2001-02-27
Classification: B29K,B32B,Y10S,Y10T

Abstract:
A biaxially oriented, coextruded polyester film having a base layer composed of at least 80% by weight of a thermoplastic polyester and one or more outer layers, where at least one outward-facing outer layer contains particles and is provided with a metallic or ceramic layer, and where the outward-facing outer layer has a number of elevations/protrusions N per mm.sup.2 of film surface area which is related to their respective heights h and diameters at film surface level d by the following equationslog N/mm.sup.2.ltoreq.A.sub.h -B.sub.h (log h/.mu.m), 0.01 .mu.m<h<10 .mu.m (1)A.sub.h =1.4; B.sub.h =2.5log N/mm.sup.2.ltoreq.A.sub.d -B.sub.d (log d/.mu.m), 0.01 .mu.m<d<10 .mu.m (2)A.sub.d =3.4; B.sub.d =2.4.