Patent ID: 7196267

Claim:
A DC electric wire or cable comprising a conductor, an insulating layer and an external shielding layer characterized in that a semi-conductive resin composition is provided, as a semi-conductive layer, between the conductor and the insulating layer and between the insulating layer and the external shielding layer, respectively, wherein the semi-conductive resin composition is made by adding a conductivity endower to an electrically insulative resin composition, said insulative resin composition comprising (1) a blend of: resin (A) which is an ethylene-α-olefin copolymer resin polymerized with a single site catalyst, and having a melt flow rate of 2 to 10; and resin (B) which is an olefin polymer other than (A) having a melt flow rate of 0.1 to 7.5, and graft polymerized with a substituent having a dipole moment of not less than 4 Debye; or (2) a blend of: resin (A) at least one ethylene-α-olefin copolymer resin graft polymerized with a substitutent having a dipole moment of not less than 4 Debye; and resin (B) at least one olefin resin other than (A) having a melt flow rate of 0.1 to 7.5; or (3) a blend of: resin (A) at least one ethylene-α-olefin copolymer resin graft polymerized with a substitutent having a dipole moment of not less than 4 Debye; and resin (B) at least one olefin polymer other than (A) having a melt flow rate of 0.1 to 7.5 graft-polymerized with a substitutent having a dipole moment of not less than 4 Debye; wherein resin (A) component is 60 to 90% by weight and resin (B) component is 40 to 10% by weight resin (A) and resin (B) having different MFRs and the MFR of resin (B) being at least 2.5 smaller than that of resin (A); and wherein the melt flow rate (MFR) represents the quantity in terms of weight (g) of polyolefin resin pellets that is extruded for 10 minutes at 190°C. under a load of 2.16 kg weight according to the standard of ASTM D1238-65T.