MODIFICATION PROCESS FOR POLYMER RECYCLATES

The present invention relates to a process for modifying a post-consumer recycled polyolefin composition comprising the steps of (A) providing a post-consumer recycled polyolefin composition having a starting melt flow rate MFR2 (1), determined according to ISO 1133 at 2.16 kg load, 230 °C, in the range of from 1.0 to 100 g/10 min, and comprising, based on the total weight of the post-consumer recycled polyolefin composition, determined by FTIR spectroscopy, (a) at least 50 wt.-% of one or more propylene (co)polymer component(s) and (b) up to 50 wt.-% of one or more ethylene (co)polymer component(s); (B) adding 0.10 to 1.50 wt.-%, based on the total weight of the post-consumer recycled polyolefin composition, of a radical initiator to the post-consumer recycled polyolefin composition and optionally mixing the components to form a mixture (1); (C) adding 0.05 to 0.50 wt.-%, based on the total weight of the post-consumer recycled polyolefin composition, of a twofold unsaturated hydrocarbon compound having the general formula (1) CH2=CH-(R)-CH=CH2, wherein R may be present or absent, and if being present, R is an aliphatic or aromatic hydrocarbon group comprising from 1 to 6 carbon atoms, and mixing the components to form a mixture (2); and (D) extruding the mixture (2) at a temperature in the range of from 180 to 300 °C to obtain a modified polyolefin composition having a final melt flow rate MFR2 (2), determined according to ISO 1133 at 2.16 kg load, 230 °C; wherein the ratio of MFR2 (2) : MFR2 (1) is below 1.00. The present invention also relates to a modified polyolefin composition obtained by the process, as well as to the use of the modified polyolefin composition in the manufacture of an article, and to a respective article.