Strippable semiconductive composition comprising low melt...

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 23/00 (2006.01) C08K 3/04 (2006.01) H01B 1/24 (2006.01) H01B 3/44 (2006.01)

Patent

CA 2723940

The present invention relates to a semiconductive polymer composition having easily controllable stripping characteristics, especially for an electric power cable. The semiconductive polymer composition comprises an ethylene copolymer comprising polar co-monomer units, wherein the amount of the polar co-monomer units in the ethylene copolymer is 10 wt.% or more, based on the total weight of the ethylene copolymer; an olefin copolymer comprising propylene monomer units and monomer units of an alpha-olefin having at least 4 carbon atoms, wherein the olefin copolymer has a melting point of 110 °C or less, and carbon black in an amount of from 10 to 50 wt.%, based on the total weight of the semiconductive polymer composition, wherein the olefin copolymer (B) is prepared by using a metallocene polymerisation catalyst. The composition provides improved strippability and enhanced mechanical as well as electrical property profile.

Composition polymère semi-conductrice présentant des caractéristiques de pelabilité faciles à maîtriser, en particulier pour un câble électrique. Ladite composition comprend: un copolymère d'éthylène contenant des unités comonomères polaires à raison de 10% ou plus en poids du poids total du copolymère d'éthylène; un copolymère oléfinique contenant des unités monomères de propylène et des unités monomères d'une alphaoléfine comptant au moins 4 atomes de carbone, le copolymère oléfinique ayant un point de fusion de 110°C ou moins; et du noir de carbone à raison de 10 à 50% en poids du poids total de la composition polymère semi-conductrice. Le copolymère d'oléfine (B) est obtenu au moyen d'un catalyseur métallocène de polymérisation. La composition de l'invention présente une pelabilité ainsi qu'un ensemble de propriétés mécaniques et électriques améliorés.

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