Impact-resistant self-extinguishing cable
AssigneePirelli Cavi e Sistemi S.p.A.
InventorsSergio Belli, Diego Tirelli, Paolo Veggetti, Alberto Bareggi
Life of this patent
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Abstract
Self-extinguishing cable, in particular an electrical cable for low-voltage or medium-voltage power transmission or distribution of data transmission, having at least one conductor and at least one flame-retardant coating positioned externally to the conductor. The flame-retardant coating is produced from an expanded polymeric material which incorporates at least one intumescent agent.
Claims30
Self-extinguishing cable (20, 30, 40) comprising at least one conductor (1) and at least one flame-retardant coating (21, 31, 41) in a position radially external to said at least one conductor (1), characterized in that said at least one flame-retardant coating (21, 31, 41) comprises an expanded polymeric material which incorporates at least one intumescent agent.
Self-extinguishing cable (20, 30, 40) according to any one of the preceding claims, characterized in that said polymeric material is a polyolefinic polymer or copolymer based on ethylene and/or propylene.
Self-extinguishing cable (20, 30, 40) according to any one of the preceding claims, characterized in that the expansion degree of said flame-retardant coating (21, 31, 41) is between 5% and 500%.
Self-extinguishing cable (20, 30, 40) according to any one of the preceding claims, characterized in that the thickness of said flame-retardant coating (21, 31, 41) is between 0.5 mm and 6 mm.
Self-extinguishing cable (20, 30, 40) according to any one of the preceding claims, characterized in that the amount of said intumescent agent is between 1% and 60% by weight relative to the total weight of the base composition.
Self-extinguishing cable (20, 30, 40) according to any one of the preceding claims, characterized in that said expanded polymeric material incorporates at least one mineral filler.
Self-extinguishing cable (20, 30, 40) according to any one of the preceding claims, characterized in that said flame-retardant coating (21, 31, 41) satisfies the flame-resistance characteristics according to IEC standard 332/3C.
Self-extinguishing cable (20, 30, 40) according to any one of the preceding claims, characterized in that said flame-retardant coating (21, 31, 41) is obtained by extrusion.
Self-extinguishing cable (20, 30, 40) according to any one of the preceding claims, characterized in that, after expansion, said polymeric material is subjected to a crosslinking stage.
Method for giving a cable (20, 30, 40) flame-retardant and impact-resistance properties, characterized in that said cable (20, 30, 40) is given at least one flame-retardant coating (21, 31, 41) comprising an expanded polymeric material incorporating at least one intumescent agent.
Dependencies are inferred from the claim text.