Modified polyvinyl acetal insulated conductors

Claim 1

AN INSULATED COOPER CONDUCTOR IN WHICH THE OTHER INSULATION THEREFOR COMPRISES ESSENTIALLY A HARD, FLEXIBLE TOUGH, ABRASION-RESISTANT AND FREON-RESISTANT COATING, SAID COATING BEING THE HEATED-TREATED PRODUCT OF A MIXTURE OF INGREDIENTS CONSISTING ESSENTIALLY, BY WEIGHT, OF (1) FROM 95 TO 50 PERCENT OF A POLYVINYL FORMAL RESIN OBTAINED BY CONDENSING FORMALDEHYDE WITH A PRODUCT OF HYDROLYSIS OF POLYVINYL ACETATE, (2) FROM 5 TO 50 PERCENT OF A HEAT-HARDENABLE RESIN OBTAINED BY CONDENSING A PHENOL SELECTED FROM THE CLASS CONSISTING OF PHENOL, CRESOL, XYLENOL AND MIXTURES THEREOF, WITH FROMALDEHYDE IN THE RATIO OF ONE MOL OF THE PHENOL TO 0.7 TO 2 MOLS OF THE FORMALDEHYDE IN THE PRESENCE OF AN ALKALINE CATAYLST, (3) FROM 0.3 TO 1.2 PERCENT, BASED ON THE WEIGHT OF RESIN SOLIDS REPRESENTED BY THE POLYVINYL FORMAL RESIN, OF A CONDENSATION PRODUCT SELECTED FROM THE GROUP CONSISTING OF UREA-ALDEHYDE, ALKAYLATED UREA ALDEHYDE, PYRROLEALDEHYLE, AROMATIC AMINE ALJEDYDE, AND THIOUREA-ALDEHYDE CONDENSATES, AND (4) A SOLVENT IN WHICH (1), (2) AND (3) ARE SOLUBLE COMPOSED, BY WEIGHT, OF FROM AND NAPTHA, THE SOLIDS CONTENT OF THE TREATING SOLUTION FOR THE CONDUCTOR BEING COMPOSED, BY WEIGHT, OF FROM 5 TO 25 PARTS OF THE ABOVE-DESCRIBED RESINOUS INGREDIENTS TO ABOUT 75 TO 95 PARTS OF THE CRESOL NAPTHA SOLVENT.