Patent ID: 7288312

Claim:
A coextruded, transparent, biaxially oriented polyester film comprising a base layer (B) and a heatsealable top layer (A) which is peelable from at least APET, the heatsealable and peelable top layer (A) consisting of a) about 80-98% by weight of polyester and b) about 2-10% by weight of inorganic and/or organic particles having an average diameter d 50 of from about 2.0 to 8.0 μm, based on the mass of the top layer (A), wherein c) the polyester comprises about 30-95 mol % of units derived from at least one aromatic dicarboxylic acid and about 5-70 mol % of units derived from at least one aliphatic dicarboxylic acid, d) the ratio of particle size d 50 and layer thickness d A of the top layer (A) is greater than about 1.3 and e) the layer thickness of the top layer (A) d A is from about 0.5 to 2.5 μm.