E.i. Dupont De Nemours and Company

John C Norman

Hamid M Ghorashi

A process for preparing an insulated metal wire with a melt-coated, adherent sheath of a polymer consisting essentially of the following repeat units: ##STR1## wherein n is 4 or 5; X is from 0.01 to 0.50; and Ar is at least one divalent aromatic radical selected from the group consisting of 1,3-phenylene, 1-methyl-2,4-phenylene and 3,4'-oxydiphenylene, comprising heating the bare wire to a temperature in excess of the Tg of the polymer and melt-coating the wire with the polymer. This produces an insulated wire that is stable to high temperatures and is resistant to water crazing, cracking and loss of coating.

Method of coating a metal wire with a temperature and stress resistant

Copper wire insulated with a certain copolyamide sheath is stable to high temperatures and is resistant to water crazing, cracking and loss of coating.

Coated wire

Amine-ended poly(p-phenylene terephthalamide) gives improved spinning results.

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Wilmington, DE, United States of America

John C Norman