Abstract
Efficient stabilization packages are always applied in LLDPE film grades, in order to guarantee continuous processing without deterioration of the polymer’s properties.
The stabilization efficiency of three additive systems, containing different phosphorus stabilizers was studied. Analysing the changes in MFI (molecular weight) and in MFR (melt flow ratio, related to molecular weight distribution) after multiple extrusions leads to complex information about the parameters influencing the degradation behaviour of LLDPE. It was found that the molecular properties of the polyethylene can he significantly affected even by mild processing conditions during the first melt processing stage and that the performance of a processing stabilizer has to be assessed for its initial inhibition efficiency in processing.