Coextruded, heatsealable and peelable polyester film having strong peelability, process for its production and its use

摘要

The invention relates to a coextruded, transparent, biaxially oriented polyester film comprising a base layer (B) and a heatsealable top layer (A) which is peelable from APET, the heatsealable and peelable top layer (A) consisting of a) 50-95% by weight of polyester and b) 5-40% by weight of a polyester-incompatible polymer (=anti-PET polymer) based on the mass of the top layer (A), and c) the polyester being composed of 20-95 mol % of units which derive from at least one aromatic dicarboxylic acid and 5-80 mol % of units which derive from at least one aliphatic dicarboxylic acid, the sum of the dicarboxylic acid-derived molar percentages being 100, and d) the layer thickness of the top layer (A) dA being from 1.3 to 3.0 mum. The invention further relates to a process for producing the film and to its use.