Multilayer film with polyamide and polyester layers for the production of photovoltaic modules

A multilayer film, comprising, in the order listed:

• a) a layer of a moulding composition which comprises at least 35% by weight, based on the overall layer moulding composition, of polyamide;
• b) optionally, an adhesion promoter layer;
• c) a layer of a moulding composition which comprises at least 35% by weight, based on the overall layer moulding composition, of a thermoplastic polyester;
• d) optionally, an adhesion promoter layer;
• and
• e) a layer of a moulding composition which comprises at least 35% by weight, based on the overall moulding composition, of polyamide;
• wherein
• at least one of layer b) or layer d) is present,
• the at least one of layer b or d) comprises 60 to 100% by weight of:
• 0.1 to 100% by weight of a polyamine-polyamide graft copolymer,
• 0 to 99.9% by weight of a polyamide and
• 0 to 99.9% by weight of a thermoplastic polyester,
• with the proviso that the polyamine-polyamide graft copolymer comprises as copolymerized monomers:
• 0.5 to 25% by weight, based on the weight of the graft copolymer, of a polyamine having at least 4 nitrogen atoms and
• at least one polyamide-forming unit selected from the group consisting of a lactam, an ω-aminocarboxylic acid and an equimolar combinations of a diamine and a dicarboxylic acid.