Surface treatment of perfluorocarbon polymer structures

Claim 1

A PROCESS WHICH COMPRISES CONTINUOUSLY PASSING A CONTINUOUS FILM OF A COPOLYMER OF TETRAFLUOROETHYLENE AND HEXAFLUOROPROPENE CONTAINING FROM 95% TO 50% BY WEIGHT OF TETRAFLUOROETHYLENE AND FROM 5% TO 50% OF HEXAFLUOROPROPENE, BETWEEN POSITIVE AND NEGATIVE ELECTRODES SPACED A DISTANCE FROM ABOUT 0.015 TO ABOUT 0.25 OF AN INCH APART, CONTINUOUSLY APPLYING TO SAID POSITIVE ELECTRODE AN ALTERNATING CURRENT AT A VOLTAGE WITHIN THE RANGE FROM 10,000 TO 30,000 VOLTS, AND AT A FREQUENCY IN THE RANGE OF FROM 300,000 TO 500,000 CYCLES PER SECOND, AND MAINTAINING BETWEEN SAID ELECTRODES A SUBSTANTIALLY OXYGEN GAS-FREE ATMOSPHERE CONTAINING LESS THAN ABOUT 5% BY VOLUME OF THE VAPORS OF A NON-OXIDIZING ORGANIC COMPOUND HAVING A VAPOR PRESSURE OF AT LEAST 0.25 MILLIMETER OF MERCURY AT 60*C. IN A GASEOUS CARRIER MEDIUM WHICH WILL SUSTAIN SAID ELECTRICAL DISCHARGE, WHEREBY TO RENDER A SURFACE OF SAID FILM ADHERABLE TO OTHER MATERIALS, AND THEREAFTER COATING SAID SURFACE WITH A POLYMERIC COATING.