Cable coated with at least two concentric layers of polymeric material and process of making same
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United States of America Patent
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May 19, 1992
Grant Date -
N/A
app pub date -
Dec 7, 1989
filing date -
Jul 13, 1988
priority date (Note) -
Expired
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Abstract
An abrasion- and termite-resistant cable comprises at least one elongate functional element coated with at least two concentric layers of polymeric material, the exterior layer being a polyamide and the layer adjacent thereto being an essentially olefin polymer which comprises from 0.001 to 30% by weight of polar monomer selected from unsaturated acids and acid anhydrides. Other monomers and properly-modifying polymers may also be present in the olefin polymer. These layers are applied in a single operation wherein at least one of the polymeric materials is in a fluid state when the materials are contacted. The invention permits the construction of a cable with an unusally thin polyamide layer. It also permits the extrusion of the layers on an aluminium-sheathed functional element without the need for an adhesion-promoting layer on the aluminium.
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