Electrical cable comprising a thermoplastic insulating layer based on polypropylene, including gas bubbles

Abstract

Electrical cable comprising a thermoplastic insulating layer based on polypropylene including gas bubbles. The present invention relates to an electrical cable comprising at least one electrically conductive elongated element and an electrically insulating layer in direct contact with the electrically conductive elongated element, wherein: - the electrically insulating layer is obtained from a thermoplastic polymer composition comprising at least 50% by mass of polypropylene, in the form of a homopolymer, a copolymer, or a mixture, and in homophasic, heterophasic, or mixture form; and - the electrically insulating layer comprises gas bubbles. Figure for the abstract: Fig. 1

Claims

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17. Electric cable according to any one of the preceding claims characterized in that the electrically insulating layer including the gas bubbles has a density between 0.5 and 1. Electric cable according to claim 1, characterized in that said gas bubbles contain N2 or CO2. An electrical cable according to any one of the preceding claims, characterized in that the electrical cable comprises an outer sheath in contact with the electrically insulating layer. A method for applying a thermoplastic coating layer around at least one elongated electrically conductive element, said method comprising the application, in particular by extrusion, of a thermoplastic polymer composition according to claim and the addition of gas bubbles during extrusion. A process according to claim 12, characterized in that a chemical expander is added to the thermoplastic polymer composition before extrusion. A process according to claim 13, characterized in that the chemical expander is hydrocerol. A process according to claim 13 or 14, characterized in that the chemical expander is introduced at a content of between 0.1 and 10% by weight relative to the total weight of the thermoplastic polymer composition. A method according to claim 12, characterized in that a gas is injected during extrusion. Method according to claim 12, characterized in that the expansion rate of the insulating layer is between 2% and 50%.

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