Patent ID: 8227543

Claim:
Flexible thermoplastic grafted copolymer composition having a high thermomechanical strength and being resistant to aging in oil, comprising a blend of a grafted copolymer having polyamide blocks, and ethylene/vinyl alcohol copolymer (EVOH) having a degree of saponification of at least 95 mol %, wherein said grafted copolymer having polyamide blocks, is formed from a polyolefin backbone and from at least one polyamide graft in which: the grafts are attached to the backbone by the residues of an unsaturated monomer (X) having a functional group capable of reacting with a polyamide having an amine end group or a carboxylic acid end group; the residues of the unsaturated monomer (X) are attached to the backbone by grafting or copolymerization via its double bond; wherein said grafted copolymer composition comprises: from 40 to 90% by weight of said polyolefin backbone comprising the unsaturated monomer (X); from 5 to 40% by weight of said polyamide grafts; and from 5 to 40% by weight of said at least one EVOH copolymer, wherein said EVOH copolymer has an ethylene content of between 20 and 60 mol %, and a melt flow index (MFI) between 2 and 30 g/10 min (measured at 210° C. under 2.16 kg).