C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 23/04 (2006.01) C08L 23/08 (2006.01) C08L 45/00 (2006.01)
Patent
CA 2045528
The film memory thermoplastic composition comprises a mixture of about 5-20 parts by weight of optionally cross-linked polynorbornene, and about 80-95 parts by weight of at least one polyolefin and of a sufficient amount of polynorbornene plasticizer to reduce its glass-transition temperature to the range of rubbers. As a polyolefin, a composition is selected which comprises from 80 to 100 % of at least one ethylene copolymer and at least one alpha-olefin selected from propylene and butene-1, said copolymer having a density between 0.850 and 0.890 and a melt flow index between 0.3 and 15 dg/min., and from 0 to 20 % of at least one polypropylene polymer. Applications: gaskets, footwear components, flexible tubing, shock-absorbing elements, profiles for the automobile and construction industries, etc.
Cette composition thermoplastique à mémoire élastique comprend un mélange d'environ 5-20 parties en poids de polynorbornène éventuellement réticulé, d'environ 80-95 parties en poids d'au mains une polyoléfine et d'une quantité de plastifiant du polynorbornène suffisante pour abaisser sa température de transition vitreuse jusqu'à la gamme des caoutchoucs. Selon l'invention, on choisit, comme polyoléfine, une composition comprenant de 80 à 100% d'au moins un copolymère d'éthylène et d'au mains une .alpha.-oléfine choisie parmi le propylène et le butène-1, ledit copolymère ayant une densité comprise entre 0,850 et 0,890, et un indice de fluidité compris entre 0,3 et 15 dg/min., et de 0 è 20% d'au moins un polymère de polypropylène. Applications : joints d'étanchéité, éléments de chaussures, tuyaux souples, éléments amortissants, profilés pour l'industrie du bâtiment et de l'automobile, etc,
Kaifasz Patrick
Seguela Brigitte
Atochem
Robic
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