Multi-layered, biaxially-oriented polyester film with an optimized electrical conductivity over its total thickness

摘要

The invention relates to a multi-layered biaxially-oriented film, mainly made of a crystallizeable thermoplastic polyester and economically produceable with a high surface quality, i.e. without pinning bubbles and without electric arcing and film breaks, at production speeds of 340 m/min or higher. According to the invention the multi-layered polyester film has an average specific electrical melt resistance over its total thickness which lies within a range from 1.510⁷ to 3010⁷ cm. The invention also relates to a method of production of the film.