Abstract: One subject of the invention is the use of ? film as a protective backsheet in a photovoltaic module, said film comprising at least one layer of a composition containing a polyamide-grafted polymer, this polyamide-grafted polymer comprising a polyolefin backbone containing a residue of at least one unsaturated monomer (X) and at least one polyamide graft, in which: • the polyamide graft is attached to the polyolefin backbone by the residue of the unsaturated monomer (X) that comprises a functional group capable of reacting via a condensation reaction with a polyamide having at least one amine end group and/or at least one carboxylic acid end group; • the residue of the unsaturated monomer (X) is attached to the backbone by grafting or copolymerization; said polyamide-grafted polymer comprising, relative to its total weight: • from 40 to 95% by weight of the polyolefin backbone comprising the unsaturated monomer (X); and • from 5 to 60% by weight of polyamide grafts, and the melting point or glass transition t