| abstract |
The invention relates to a biaxially stretched film whose polymeric constituents consist predominantly of a polyester, wherein the film contains at least one copper salt and a halide, and wherein the film has a dielectric strength (alternating strength) AC at 23 ° C and 50 Hz of at least 100 kV / mm. Furthermore, the invention relates to a process for the preparation and the use of the film according to the invention, in particular in solar modules. |