| abstract |
A process is provided for improving the resistance to deterioration when exposed to weather and the adherence to other materials of polypropylene, particularly in the form of moldings, which comprises subjecting a surface of polypropylene to the action of activated oxygen gas at a temperature below about 100 DEG C. in the presence of an N-alkyl or N-acyl 2,2,6,6-tetramethyl piperidyl compound for a time sufficient to improve such weather resistance and adherence. |