Telephone cable with cellular filler of - low dielectric constant

摘要

A multi-core telephone cable with individual conductors insulated by an ethylene-propylene copolymer foam has all spaces between them and around them up to the common sheath filled by a mixture containing cumarone indene resin and a chlorinated paraffin wax. The mixture pref. contains 5-10 wt.% of hollow glass beads or beads of polyvinylidene dichloride acrylonitrile copolymer beads filled with isobutane.