TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The oxygen scavenger is a sulfite compound selected from sodium sulfite, potassium sulfite, ammonium sulfite, sodium bi-sulfite, potassium bi-sulfite, and/or ammonium bi-sulfite.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The oxygen scavenger is selected from hydrazine, hydrazones, carbohydrazones, alkyl-semicarbazides, arylsemicarbazides, 1,3-dihydroxyacetone, and/or sulfites. The solvent is an alcohol, preferably a 1-10C alcohol, especially methanol, ethanol, 1-propanol, 2-propanol, 1-butanol or 2-butanol and particularly 2-propanol.    TECHNOLOGY FOCUS - POLYMERS - Preferred Method: The amount of the oxygen scavenger in the grafting solution used is 0.5-4 (preferably 1-3) g/l. The graft polymerization is performed in a reactor, which is purged during step (c) with an inert gas, preferably with nitrogen. The graft polymerization in step (c) is performed at 20-80 degrees C, preferably at 40-75 degrees C and especially at 50-70 degrees C. The base polymer is irradiated in step (a) with a dose of 1-100 Kilo Gray (kGy), preferably 1-50 kGy and especially 10-30 kGy. The irradiated base polymer film is pulled in step (b) continuously through a reservoir containing the grafting solution, where the reservoir is preferably located in a container which is purged with nitrogen. The irradiated base polymer film is continuously pulled through a scavenger solution containing a solvent and an oxygen scavenger, before the film is continuously pulled through the reservoir containing the grafting solution. Preferred Components: The graft monomer is selected from styrene, alpha -methylstyrene, methyl- alpha -methylstyrene, methoxy- alpha -methylstyrene, and/or sodium- alpha -methylstyrene sulfonate. The grafting solution applied in step (b) further contains at least one graft comonomer and at least one solvent. The graft comonomer is methacrylonitrile. The grafting solution comprises an alcohol (10-70 wt.%, preferably 40-60 wt.%) as solvent, a graft monomer (10-30 wt.%, preferably 15-25 wt.%), a graft comonomer (0-20 wt.%, preferably 5-15 wt.%), an oxygen scavenger (0.001-20 wt.%, preferably 0.05-2 wt.%) and water (0-50 wt.%, preferably 10-30 wt.%). The base polymer is selected from polytetrafluoroethylene, poly(tetrafluoroethylene-co-perfluoropropyl vinyl ether), poly(tetrafluoroethylene-co-hexafluoropropylene), poly (vinylidene fluoride), poly(vinylidene fluoride-co-hexafluoropropylene), poly(ethylene-tetrafluoroethylene), polyvinylfluoride, polyethylene and polypropylene. When the base polymer is poly(ethylene-tetrafluoroethylene), the grafting solution contains alpha -methylstyrene as graft monomer and methacrylonitrile as graft comonomer. EXAMPLE - No suitable example given.