Method of cross-linking a filled polymer based on polyethylene

Abstract

A method of cross-linking a composition comprising firstly a polyethylene-based silane-grafted polymer, and secondly a filler. The invention is remarkable in that the cross-linking method consists in mixing the composition with a condensation catalyst constituted by lauryl stannoxane of formula [(C 4 H 9 ) 2 Sn(OOCC 11 H 23 )] 2 O.

1 . A method of manufacturing a power and/or telecommunications cable, including at least one insulating covering, said method comprising the steps of:
 mixing a composition comprising firstly a polyethylene-based silane-grafted polymer and secondly a filler with a condensation catalyst constituted by lauryl stannoxane of formula [(C 4 H 9 ) 2 Sn(OOCC 11 H 23 )] 2 O,   extruding the composition obtained from the preceding step, and   crosslinking the extruded composition in order to form the insulating covering.   
   
   
       2 . A method according to  claim 1 , wherein the condensation catalyst is packaged in the form of a master batch. 
   
   
       3 . A method according to  claim 2 , wherein the master batch comprises a polymer matrix having lauryl stannoxane dispersed therein. 
   
   
       4 . A method according to  claim 3 , wherein the polymer matrix of the catalyst master batch is of nature identical to that of the base polymer of the composition. 
   
   
       5 . A method according to  claim 1 , wherein the composition includes 0.0036% to 0.0108% of condensation catalyst. 
   
   
       6 . A method according to  claim 1 , wherein the composition includes 90 pcr to 190 pcr of filler. 
   
   
       7 . A method according to  claim 1 , wherein the composition further includes at least one additive selected from the group consisting of a processing agent, an anti-oxidant, a colorant, an anti-UV agent, an anti-copper agent. 
   
   
       8 . A method according to  claim 1 , wherein the composition includes less than 3 pcr of processing agent. 
   
   
       9 . A method according to  claim 1 , wherein the composition includes 0.5 pcr to 5 pcr of anti-oxidant. 
   
   
       10 . A method according to  claim 1 , the crosslinking step being implemented at ambient temperature. 
   
   
       11 . A method according to  claim 1 , the crosslinking step being implemented in the open air.