Low adhesion semi-conductive electrical shields

A method of making a strippable semiconductive shield comprising the steps of compounding a base polymer selected from the group consisting of ethylene vinyl acetate copolymers, ethylene alkyl acrylate copolymers wherein the alkyl group is selected from C1 to C6 hydrocarbons, ethylene alkyl methacrylate copolymers wherein the alkyl group is selected from C1 to C6 hydrocarbons and ethylene alkyl acrylate alkyl methacrylate terpolymers wherein the alkyl group is independently selected from C1 to C6 hydrocarbons with;

• an adhesion modifying compound different from said base polymer comprising an ethylene vinyl acetate with a molecular weight greater than about 20,000 daltons and a polydispersivity greater than about 2.5 and
• a conductive carbon black in an amount sufficient to give the semiconductive shield a resistance below about 550 ohm-meter together in a mixer to form a mixture and
• extruding the mixture to form the strippable semiconductive shield.

A method of making a medium voltage electric power cable having a strippable semiconductive shield comprising the steps of simultaneously extruding through a triple extrusion crosshead a semiconductive layer encasing a metal conductor, an insulating layer encasing the semiconductive layer and a strippable semiconductive layer encasing the insulating layer, wrapping the strippable semiconductive layer with metal wire or metal strips and placing a jacket over the metal wire or strips, wherein said strippable semiconductive comprises

• a base polymer selected from the group consisting of ethylene vinyl acetate copolymers, ethylene alkyl acrylate copolymers wherein the alkyl group is selected from C1 to C6 hydrocarbons, ethylene alkyl methacrylate copolymers wherein the alkyl group is selected from C1 to C6 hydrocarbons and ethylene alkyl acrylate alkyl methacrylate terpolymers wherein the alkyl group is independently selected from C1 to C6 hydrocarbons;
• an adhesion modifying compound different from said base polymer comprising an ethylene vinyl acetate with a molecular weight greater than about 20,000 daltons and a polydispersivity greater than about 2.5;
• a conductive carbon black in an amount sufficient to give the semiconductive shield a resistance below about 550 ohm-meter.

A method of making a medium voltage electric power cable having a strippable semiconductive shield comprising the steps of simultaneously extruding through a double extrusion crosshead onto a semiconductive layer encasing a metal conductor, an insulating layer encasing the semiconductive layer and a strippable semiconductive layer encasing the insulating layer, wrapping the strippable semiconductive layer with metal wire or metal strips and placing a jacket over the metal wire or strips, wherein said strippable semiconductive comprises

• a base polymer selected from the group consisting of ethylene vinyl acetate copolymers, ethylene alkyl acrylate copolymers wherein the alkyl group is selected from C1 to C6 hydrocarbons, ethylene alkyl methacrylate copolymers wherein the alkyl group is selected from C1 to C6 hydrocarbons and ethylene alkyl acrylate alkyl methacrylate terpolymers wherein the alkyl group is independently selected from C1 to C6 hydrocarbons;
• an adhesion modifying compound different from said base polymer comprising an ethylene vinyl acetate with a molecular weight greater than about 20,000 daltons and a polydispersivity greater than about 2.5;
• a conductive carbon black in an amount sufficient to give the semiconductive shield a resistance below about 550 ohm-meter.