For pure polypropylene, literature shows a similar situation concerning MFR increase. All relevant publications mentioned before describe an increase of the MFR that results in MFR values from 11.5 g/10min after five extrusions [45] to 171.4 g/10min after seven extrusions [49]. However, a direct comparison of these re- sults with the findings of this work is not possible due to the use of different polymers and additives such as different copolymers, antioxidants and stabilizers and different process parameters. Nonetheless the trend is similar.