Coextruded, heatsealable and peelable polyester film, 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) 80-98% by weight of polyester and b) 2-10% by weight of inorganic and/or organic particles having an average diameter d50 of from 2.5 to 12.0 mum (based on the mass of the top layer (A)), the polyester being composed of c) 12-89 mol % of units which derive from at least one aromatic dicarboxylic acid and, d) 11-88 mol % of units which derive from at least one aliphatic dicarboxylic acid, the sum of the dicarboxylic acid-derived molar percentages being 100 and e) the ratio of particle size d50 and layer thickness dA of the top layer (A) being greater than 1.0 and f) the layer thickness of the top layer (A) dA being from 2.3 to 10.0 mum. The invention further relates to a process for producing the film and to its use.