Patent ID: 6924435

Claim:
High-voltage direct current cable semiconductive shield comprising: a blend of or which is made from a blend of (a) at least one ethylene copolymer having a density of less than about 0.900 grams/cubic centimeter, a melt index of from about 0.5 to about 10 grams/10 minutes, a crystallinity of less than about 10 percent and a catalyst residue of less than about 1000 ppm; (b) a carbon black having a low level of ionic species; (c) at least one polar polymer modifier in an amount effective to provide a semiconductive shield made with the blend with an enhanced field conductivity and enhanced space charge leakage at high fields relative to a semiconductive shield made with a blend which does not include a polar polymer modifier; and (d) at least one ion scavenger in an amount effective to reduce ionic mobility relative to a semiconductive shield made with a blend, which does not include an ion scavenger.