Patent ID: 6797886
Filing Date: 2004-09-28
Classification: H01B

Abstract:
An electric power cable comprising a conductor surrounded by an inner semiconducting layer, an insulating layer, and an outer semiconducting layer, characterized in that the insulating layer comprises a crosslinked ethylene copolymer obtained by coordination catalyzed polymerization of ethylene and at least one other alpha-olefin in at least one stage, said multimodal ethylene copolymer having a density of 0.890-0.940 g/cm3, a MFR2 of 0.1-10 g/10 min, a MWD of 3.5-8, a melting temperature of at most 125Â° C., and a comonomer distribution as measured by TREF, such that the fraction of copolymer eluted at a temperature higher than 90Â° C. does not exceed 5% by weight, and said multimodal ethylene compolymer including an ethylene copolymer fraction selected from (a) a low molecular weight ethylene copolymer having a density of 0.900-0.950 g/cm3 and a MFR2 of 25-500 g/10 min, and (b) a high molecular weight ethylene copolymer having a density of 0.870-0.940 g/cm3 and a MFR2 of 0.01-3 g/10 min.