| abstract |
This thermoplastic composition with elastic memory comprises a mixture of about 5-20 parts by weight of polynorbornene which may be crosslinked, about 80-95 parts by weight of at least one polyolefin and an amount of plasticiser for polynorbornene sufficient for reducing its glass transition temperature down to the range of rubbers. According to the invention, the polyolefin chosen is a composition comprising 80 to 100% of at least one copolymer made of ethylene and at least one alpha -olefin chosen from propylene and 1-butene, said copolymer having a relative density between 0.850 and 0.890 and a flow index between 0.3 and 15 dg/min, and 0 to 20% of at least one polypropylene polymer. Applications: Air-tight seals, footwear parts, flexible tubes, damping elements, profiles for the construction and automobile industries, and the like. |