Hot-sterilizable, biaxially oriented polyester film with good metal adhesion, its use and process for its production

Hot-sterilizable, biaxially oriented polyester film with good metal adhesion, with a base layer B containing at least 80% by weight of thermoplastic polyester, and with at least one adhesive layer which contains a mixture or a blend of two components I and II, wherein component I of the mixture or the blend contains a polyethylene terephthalate copolymer, which consists of the condensation product of the following monomers, or of the polyester forming equivalents thereof:

• A) 65 to 95 mol % of isophthalic acid;
• B) 0 to 30 mol % of at least one aliphatic dicarboxilic acid of the formula HOOC(CH2)nCOOH, wherein n ranges from 1 to 11;
• C) 5 to 15 mol % of at least one sulfomonomer containing an alkali metal sulfonate group attached to the aromatic portion of a dicarboxilic acid;
• D) the stoichiometric quantity of a copolymerizable aliphatic or cycloaliphatic glycol having 2 to 11 carbon atoms, required for forming 100 mol % of the condensation product, where the indicated percentages are individually based on the total quantity of monomers which form the polyester coating;
• and wherein component II of the mixture or the blend contains acrylic copolymers made of at least 50% by weight of one or more polymerizable acrylic or methacrylic or acrylic and methacrylic monomers, and 1 to 15% by weight of a copolymerizable comonomer, which in the copolymerized state is capable of forming intermolecular links at elevated temperatures.