Multilayer structure with adhesive properties

A multilayer structure comprising an adhesive layer and a layer forming a support film in direct contact therewith, wherein

• (a) said adhesive layer comprises:
• a polyolefin A chosen from a homopolymer of ethylene and a copolymer of ethylene and an α-olefin, a copolymer of ethylene and a vinyl ester of carboxylic acid, notably a vinyl acetate (EVA) or a (co)polymer including methyl, ethyl, propyl, n-butyl, sec-butyl, isobutyl or tert-butyl (meth)acrylate units;
• and
• -a functionalized polyolefin, distinct from polyolefin A, comprising a polyolefin backbone containing a residue of at least one unsaturated monomer (Y), the unsaturated monomer residue (Y) being fixed to the backbone by grafting or copolymerization;
• the melting temperature of the adhesive layer being between 80° C. and 120° C.,
• (b) said support film comprises a polyamide graft polymer comprising:
• a polyolefin backbone, representing from 50% to 95% by mass of the polyamide graft polymer, containing a residue of at least one unsaturated monomer (X) and at least one polyamide graft, representing from 5% to 50% by mass of said polyamide graft polymer, wherein:
• the polyamide graft is attached to the polyolefin backbone by the unsaturated monomer residue (X) comprising a function that is capable of reacting by condensation reaction with a polyamide having at least one amine end and/or at least one carboxylic acid end,
• the unsaturated monomer residue (X) is fixed to the backbone by grafting or copolymerization,
• the polyolefin backbone and the polyamide graft being chosen such that said polyamide graft polymer has a flow temperature greater than 160° C., as measured by DSC according to ISO 11357-1:2016, ISO 11357-2:2020, ISO 11357-3:2018, said flow temperature being defined as the highest temperature among the melting temperatures and the glass transition temperatures of the polyamide graft and of the polyolefin backbone.