Insulated electrical conductor and method of making the same

Claim 1

THE METHOD WHICH COMPRISES DISSOLVING IN A SOLVENT COMPRISING DIMETHYLFORMAMIDE A TERNARY POLYMER OF, BY WEIGHT, FROM 80% TO 96% ACRYLONITRILE, FROM 2% TO 10% OF A VINYLPYRIDINE AND FROM 2% TO 10% OF A THIRD, DIFFERENT, MONOETHYLENICALLY UNSATURATED MATERIAL, SAID TERNARY POLYMER HAVING AN AVERAGE MOLECULAR WEIGHT WITHIN THE RANGE OF FROM ABOUT 50,000 TO ABOUT 100,000 AND BEING DISSOLVED IN SAID SOLVENT COMPRISING DIMETHYLFORMAMIDE IN AN AMOUNT THAT WILL PROVIDE A SOLUTION HAVING A RATIO OF TERNARY POLYMER TO SOLVENT OF, BY WEIGHT, FROM ABOUT 5 TO ABOUT 25 PARTS TERNARY POLYMER TO ABOUT 95 TO ABOUT 75 PARTS SOLVENT, APPLYING THE RESULTING SOLUTION TO AN ELECTRICAL CONDUCTOR TO FORM A COATING THEREON, AND HEATING THE THUSLY COATED ELECTRICAL CONDUCTOR, AT A TEMPERATURE SUFFICIENTLY HIGH TO VOLATILIZE THE SOLVENT AND TO FORM A HARD, FLEXIBLE, TOUGH, ABRASIONRESISTANT COATING OF HIGH DIELECTRIC STRENGTH ON SAID CONDUCTOR.