Electric cable comprising a foamed polyolefine insulation...

H - Electricity – 01 – B

Patent

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H01B 7/02 (2006.01) C08J 9/10 (2006.01) H01B 13/14 (2006.01)

Patent

CA 2634341

A process for manufacturing an electric cable (10) comprising at least one core comprising a conductor (1) and an insulating coating (2) surrounding the conductor (1) is described, the process comprising the steps of: providing a polyolefin material, a silane-based cross-linking system and a foaming system comprising at least one exothermic foaming agent in an amount of from 0.1% to 0.5% by weight with respect to the total weight of the polyolefin material; forming a blend with the polyolefin material, the silane-based cross-linking system and the foaming system; and extruding the blend on the conductor (1) to form the insulating coating (2). An electric cable (10) is also described comprising at least one core consisting of a conductor (1) and an insulating coating (2) surrounding said conductor (1) and in contact therewith, the insulating coating (2) consisting essentially of a layer of expanded, silane- crosslinked polyolefin material having an expansion degree of from 3 % to 40% .

La présente invention concerne un procédé de fabrication d~un câble électrique (10) comprenant au moins un noyau comprenant un conducteur (1) et un revêtement isolant (2) entourant le conducteur (1), les étapes du procédé consistant à introduire un matériau polyoléfine, un système de réticulation à base de silane et un système d~expansion comprenant au moins un agent d~expansion exothermique en une quantité comprise entre 0,1 % et 0,5 % en poids par rapport au poids total du matériau polyoléfine ; à constituer un mélange avec le matériau polyoléfine, le système de réticulation à base de silane et le système d~expansion ; et à extruder le mélange sur le conducteur (1) pour constituer le revêtement isolant (2). L~invention concerne également un câble électrique (10) comprenant au moins un noyau constitué d'un conducteur (1) et un revêtement isolant (2) entourant ledit conducteur (1) et en contact avec celui-ci, le revêtement isolant (2) étant principalement constitué d~une couche de matériau polyoléfine expansé réticulé au silane dont le degré d'expansion est compris entre 3 % et 40 %.

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