Process for continuous production of a multilayer electric cable

Adhesive bonding and miscellaneous chemical manufacture – Methods – Making electrical conductors of indefinite length

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

Patent

active

044695390

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 semiconductive 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 semiconductive EIS layer is formed of a copolymer of an ethylene/acrylate/monoalkyl ester of 1,4-butenedioic acid copolymer, conductive carbon black, a peroxide curing agent and polyethylene or polyethylene copolymer. The semiconductive 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 semiconductive EIS layer, since other conventional semiconductive compositions are susceptible to being adversely affected by the severe conditions of dry processing.

REFERENCES:
patent: 3474189 (1969-10-01), Plate et al.
patent: 3816347 (1974-06-01), Luh
patent: 3876462 (1975-04-01), Carini et al.
patent: 3904588 (1965-09-01), Greene

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