Process for enhancing the melt strength of polypropylene

摘要

Process for enhancing the melt strength of polypropylene by heat treating said polypropylene at a temperature between 150°C and 300°C in the presence of 0.3-3wt%, based on the weight of the polypropylene,of a dialkyl peroxydicarbonate having alkyl groups with 12-20 carbon atoms, wherein a hydrophilic silica with a silanol group concentration of at least 1.0 mmol Si-OH groups/g, as measured by LiAlH