Cross-linking of polymers

Claim 1

THE PROCESS EHICH COMPRISES UNIFORMLY ADMIXING A POLYMER CONTAINING AS SUBSTITUENTS ONLY FLUORINE AND HYDROGEN OF A POLYFLUORINATED HYDROGEN-CONTAINING OLEFIN CONTAINING ONLY FLUORINE AND HYDROGEN AND FROM 2 TO 4 CARBON ATOMS WHEREIN AT LEAST HALF OF THE CARBON ATOMS ARE BONDED TO FLUORINE ATOMS, WITH AN ALKYLENE POLYAMINE CROSSLINKING AGENT SELECTED FROM THE GROUP CONSISTING OF POLYAMINES CONTAINING AT LEAST TWO AMINO GROUPS SELECTED FROM THE GROUP CONSISTING OF PRIMARY AMINO GROUPS AND SECONDARY AMINO GROUPS IN AN AMOUNT OF BETWEEN 0.1 TO 15 PARTS BY WEIGHT OF POLYAMINE PER 100 PARTS BY WEIGHT OF POLYMER AT A TEMPERATURE NOT EXCEEDING 100*C. TO FORM A MIXTURE OF SAID POLYMER AND SAID POLYAMINE AND SUBSEQUENTLY HEATING SAID MIXTURE AT A TEMPERATURE OF FROM ABOVE 100 TO 250*C., FOR A PERIOD OF FROM 10 MINUTES TO 15 HOURS, AND UNDER A PRESSURE OF 100 TO 2000 POUNDS PER SQUARE INCH GAUGE WHEREBY SAID POLYMER IS CROSSLINKED BY SAID POLYAMINE.