Process for continuous production of a multilayer electric cable

Details Process for continuous production of a multilayer electric cable Process for continuous production of a multilayer electric cable

1983-02-22

1984-09-04

Dawson, Robert A.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Making electrical conductors of indefinite length

156298, 174105SC, 174115, 174120SC, 427120, 428383, H01B 1314

Patent

active

044695381

ABSTRACT:
An improved multilayer electric cable is disclosed having a conductive core, an extruded strand shield (ESS) layer, an insulating layer of polymeric insulation material surrounding the core and coaxial therewith, a semi-conductive insulation shield (EIS) layer strippably bonded to the insulation layer surrounding it and coaxial therewith and, preferably, a plurality of axially extending drain wires disposed within the semiconductive EIS layer. The semi-conductive EIS layer is formed of a copolymer of an ethylene/alkylacrylate/monoalkyl ester of 1,4-butenedioic acid copolymer, conductive carbon black, and a peroxide curing agent and preferably also a copolymer of ethylene and propylene or a copolymer of ethylene, propylene and an unconjugated diene. The semi-conductive EIS layer is applied by extrusion at elevated temperature in a dry gas atmosphere. Such dry processing conditions are sufficiently severe that the copolymer of ethylene/acrylate/ester can reliably serve as a suitable basis for the semi-conductive EIS layer, since other conventional semi-conductive compositions are susceptible to being adversely affected by the severe conditions of dry processing.

REFERENCES:
patent: 3474189 (1969-10-01), Plate et al.
patent: 3876462 (1975-04-01), Carini et al.
patent: 3904588 (1975-09-01), Greene

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