Patent ID: 6673448
Filing Date: 2004-01-06
Classification: C08K,C08L,H01B,Y02P,Y10T

Abstract:
A semiconducting composition for electric cables which, based on the total weight of the composition, comprises(a) 50-90% by weight of an ethylene copolymer; (b) carbon black in an amount at least sufficient to make the composition semiconducting; (c) 0-8% by weight of a peroxide cross-linking agent; and (d) 0-8% by weight of conventional additives, wherein the ethylene copolymer (a) is a heterogeneous ethylene-alkyl(meth)acrylate copolymer with the comonomer units distributed non-randomly in the polymer chains, which besides ethylene moieties comprises 2-10 mole % of an alkyl(meth)acrylate comonomer moiety, chosen from the group consisting of: methyl(meth)acrylate, ethyl(meth)acrylate, (iso)propyl(meth)acrylate and butyl(meth)acrylate, and the melting point of which is at least 95Â° C. and is higher than (108.5-1.7Ã—(mole % of alkyl(meth)acrylate comonomer)) degree centigrade; and wherein said semiconducting composition is used for inner or non-strippable outer semiconductive layers of said electric cables.