Fire-resistant composition, in particular as material for a power and/or a telecommunications cable

Abstract

The present invention relates to a fire-resistance composition in particular as a material for a power and/or telecommunications cable. The invention is remarkable in that the composition comprises a polymer together with aluminum oxide in the form of particles having a mean diameter of less than one micrometer.

1 . A fire-resistance composition for a power and/or telecommunications cable, the composition comprising: 
 a polymer together with aluminum oxide in the form of particles having a mean diameter of less than one micrometer.    
   
   
       2 . A composition according to  claim 1 , wherein the aluminum oxide particles present a mean diameter of less than 20 nm.  
   
   
       3 . A composition according to  claim 1 , including 1% to 80% by weight aluminum oxide and preferably 2% to 20%.  
   
   
       4 . A composition according to  claim 1 , wherein the polymer is selected from a polyethylene, a polypropylene, a copolymer of ethylene and propylene, an ethylene-propylene-diene terpolymer, a copolymer of ethylene and vinyl acetate, a copolymer of ethylene and methyl acrylate, a copolymer of ethylene and ethyl acrylate, a copolymer of ethylene and butyl acrylate, a copolymer of ethylene and octene, an ethylene-based polymer, a polypropylene-based polymer, an imide polyether, a thermoplastic polyurethane, a polyester, a polyamide, a halogenated polymer, or any mixture thereof.  
   
   
       5 . A composition according to  claim 1 , including at least one associated fire-retardant filler.  
   
   
       6 . A composition according to  claim 5 , wherein each associated fire-retardant filler is selected from compounds containing phosphorous such as organic or inorganic phosphates, compounds containing antimony such as antimony oxide, metallic hydroxides such as aluminum hydroxide and magnesium hydroxide, compounds based on boron such as borates, carbonates of alkaline metals in groups IA and IIA such as the carbonates of calcium, sodium, potassium, or magnesium, and the corresponding hydroxide carbonates, compounds based on tin such as stannates and hydrostannates, melamine and its derivatives such as melamine phosphates, formophenolic resins, phyllosilicates such as sepiolite, attapulgite, montmorilonite, illite, chlorite, kaolinite, micas, and talcs.  
   
   
       7 . A composition according to  claim 5 , including 1% to 80% by weight of associated flame-retardant filler.  
   
   
       8 . A composition according to  claim 1 , including at least one additive selected from the group of lubricants, plasticizers, thermal stabilizers, pigments, anti-oxidants, and ultraviolet stabilizers.  
   
   
       9 . A power and/or telecommunications cable, including at least one insulating sheath made from a fire-resistant composition according to  claim 1 .  
   
   
       10 . A power and/or telecommunications cable, including at least one protective sheath made from a fire-resistant composition according to  claim 1 .  
   
   
       11 . A power and/or telecommunications cable, including at least one padding layer made from a fire-resistant composition according to  claim 1.