Adhesive bonding agent for PVDF, its application as barrier material and material obtained from the latter

Material having a plurality of layers comprising a first layer of polyvinylidene fluoride (PVDF), a second layer of a bonding agent comprising a polymer A and PVDF, and a third layer of a polymer incompatible with PVDF, said bonding agent imparting a barrier property to hydrocarbons, and the polymer A of the bonding agent comprising units I and II, unit I being defined by a formula ##STR4## wherein R.sub.1 denotes H or a linear or branched alkyl containing from 1 to 20 carbon atoms, and R.sub.2 denotes a linear or branched alkyl containing from 1 to 20 carbon atoms, and R.sub.2 may be identical or different from R.sub.1, provided that R.sub.2 may not be H, and unit II being defined by a formula ##STR5## wherein R.sub.3 denotes H or a linear or branched alkyl containing from 1 to 20 carbon atoms, wherein R.sub.3 is in a form selected from the group acidic, anhydride derivatives, and mixtures thereof, provided that R.sub.3 does not comprise imide units;

• and said material is formed by coextrusion or overmoulding of the plurality of the layers.