Wire and cable insulation

H - Electricity – 01 – B

Patent

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Details

H01B 3/00 (2006.01) C01G 9/00 (2006.01) C08K 3/22 (2006.01) C08K 3/30 (2006.01) C08K 5/00 (2006.01) C08L 23/10 (2006.01) C08L 23/12 (2006.01) C08L 23/14 (2006.01) C08L 23/16 (2006.01) H01B 3/44 (2006.01) C08L 23/08 (2006.01)

Patent

CA 2439978

Wire or cable insulation comprising at least 30 %, preferably at least 40 %, of polypropylene homo- and/or co-polymer, and comprising at least 2 %, preferably at least 4 % zinc sulphide and/or at least 5 %, preferably at least 10 %, zinc oxide, percentages being by weight based on the whole insulation composition. Preferably, the insulation contains little or substantially zero hydrated flame-retardant fillers and substantially zero mercaptobenzimidazole, and a majority by weight or substantially all of any propylene copolymers present are copolymers of propylene with halogen-free co-monomers.

Cette invention concerne une composition isolante de fils ou de câbles, comprenant au moins 30 %, et de préférence au moins 40 % d'homopolymère et/ou de copolymère de polypropylène, et comprenant au moins 2 %, et de préférence au moins 4 % de sulfure de zinc et/ou au moins 5 %, et de préférence au moins 10 % d'oxyde de zinc, ces pourcentages étant des pourcentages en poids basés sur la totalité de la composition isolante. La composition isolante renferme de préférence une faible quantité, voire sensiblement pas, de charges retardatrices de flamme hydratées, et sensiblement pas de mercaptobenzimidazole, la majorité en poids ou la quasi-totalité des copolymères de propylène quelconques présents étant des copolymères de propylène contenant des co-monomères exempts d'halogène.

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