Biaxially stretched polyester film containing a decarboxylation catalyst and method for production of same and use of same in electrical insulation applications

摘要

Biaxially stretched film comprises polymer components, at least one copper salt and a halide, where the: film has a dielectric strength in alternating current at 23[deg] C and 50 Hz of at least 100 kV/mm; and the polymer components are predominantly polyester. Independent claims are included for: (1) the preparation of the film comprising extruding a melt to a single layer of the film through a flat nozzle, drawing or deterring the obtained film for the solidification of one or more rolls (cool rolls) as an amorphous prefilm, heating the film, biaxially stretching the film, thermofixing the biaxially stretched film and subsequently rolling the film; and (2) a laminate comprising the film and at least one further film.