overmolding process on a plastic insert and automobile piece obtained by this method

A method of manufacturing a composite automobile part by overmoulding, on at least one surface with an insert comprising a first plastic material, a layer of a second thermoplastic material, said method comprising the following successive steps: a) a step positioning said insert in a mold, and b) a molding step of said second thermoplastic material onto said insert; at least one of said first and second materials comprising an additive, said additive comprising a polymer on which are grafted carboxylic anhydride monomers.