Composition for electric cables

H - Electricity – 01 – B

Patent

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Details

H01B 3/44 (2006.01) C08K 5/3435 (2006.01) C08K 5/3492 (2006.01) C08L 23/04 (2006.01)

Patent

CA 2306125

A peroxide-cross-linkable ethylene polymer composition for an insulating layer of an electric cable is described. The composition is characterised in that the additives of the composition comprise an N-substituted 2,2,6,6- tetramethylpiperidine compound as an antioxidant and light stabilising agent; and that the composition after 21 days at 135 ~C has a retained ultimate tensile strength of at least 75 % and a retained ultimate elongation of at least 75 % when tested in accordance with IEC 811. This additive acts as a combined light and thermo-oxidative stabilising agent and inhibits the generation of moisture thereby reducing the risk of water tree formation. Preferably, the composition contains no conventional antioxidants, such as phenolic antioxidants, organic phosphite oxidants and sulphur containing anti- oxidants.

L'invention concerne une composition polymère d'éthylène réticulable par péroxide et destinée à un câble électrique. La composition est caractérisée en ce que les additifs de la composition comprennent un composé 2, 2,6,6-tétraméthylpipéridine substitué par N comme antioxydant et un stabilisant UV; en ce que la composition après 21 jours à 135 ·C a une résistance à la traction finale conservée d'au moins 75 % et un allongement final conservé d'au moins 75 % une fois testée selon la norme CEI 811. Cet additif agit comme un agent combiné stabilisant UV et thermo-oxydant et inhibe la génération de moisissure réduisant ainsi le risque de formation de nervures d'eau. De préférence, la composition ne contient aucun antioxydant classique tel que les antioxydants phénoliques, les oxydants phosphites organiques et les antioxydants contenant du soufre.

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