Heterophasic copolymer for compatibilization of a polypropylene/polyethylene blend said polypropylene/polyethylene blend having one or more of the following properties: (i) a content of limonene as determined by using solid phase microextraction (HS-SPME-GC-MS) of from 0.1 ppm to 100 ppm, preferably from 0.1 ppm to 50 ppm, more preferably from 0.1 ppm to 20 ppm, most preferably from 0.1 ppm to 5 ppm; (ii) a content of fatty acid(s) as determined by using solid phase microextraction (HS-SPME-GC-MS) of 0.1 to 100 ppm (iii) a content of polyamide(s) as determined by NMR of 0.05 to 1.5 wt.-%; (iv) a content of polystyrene(s) as determined by NMR of 0.05 to 3.0 wt.-% whereby said heterophasic copolymer comprises a matrix phase and an elastomer phase dispersed therein, whereby the matrix phase includes a random polypropylene copolymer, and whereby the heterophasic copolymer has - a melt flow rate MFR 2 (230°C, ISO1133) of 2.0 to 30 g/10min, and - at least one melting point Tm1 in the range of 154 to 168°C, - optionally a second melting point Tm2 in the range of 130 to 160°C, - optionally a second or third melting point Tm3 in the range of 110 to 125°C, - a xylene cold insoluble content of from 60 to 80 wt.-%, preferably 70 to 80 wt.-% (ISO 16152, 1ed, 25°C), and - a xylene cold soluble content of 20 to 40 wt.-%, preferably 20 to 30 wt.-% (ISO 16152, 1ed, 25°C), wherein the xylene cold insoluble content and the xylene cold soluble content add up to 100 wt.-%. - a content of units derived from ethylene in the xylene cold insoluble content of from 2.0 to 6.0 wt.-%, preferably 2.3 to 3.5 wt.-% and - a content of units derived from ethylene in the xylene cold soluble content of 20.0 to 40.0 wt.-%, preferably of 25.0 to 35.0 wt.%; the xylene cold soluble content having an intrinsic viscosity (measured in decalin according to DIN ISO 1628/1 at 135°C) of 2.1 dl/g to less than 6.0 dl/g, preferably 3.0 to 5.0 dl/g, more preferably 3.3 to 4.3 dl/g, and whereby optionally the heterophasic copolymer has a tensile modulus of at least 650 MPa (measured according to ISO 527-2). (i) a content of limonene as determined by using solid phase microextraction (HS-SPME-GC-MS) of from 0.1 ppm to 100 ppm, preferably from 0.1 ppm to 50 ppm, more preferably from 0.1 ppm to 20 ppm, most preferably from 0.1 ppm to 5 ppm; (ii) a content of fatty acid(s) as determined by using solid phase microextraction (HS-SPME-GC-MS) of 0.1 to 100 ppm (iii) a content of polyamide(s) as determined by NMR of 0.05 to 1.5 wt.-%; (iv) a content of polystyrene(s) as determined by NMR of 0.05 to 3.0 wt.-% whereby said heterophasic copolymer comprises a matrix phase and an elastomer phase dispersed therein, whereby the matrix phase includes a random polypropylene copolymer, and whereby the heterophasic copolymer has - a melt flow rate MFR 2 (230°C, ISO1133) of 2.0 to 30 g/10min, and - at least one melting point Tm1 in the range of 154 to 168°C, - optionally a second melting point Tm2 in the range of 130 to 160°C, - optionally a second or third melting point Tm3 in the range of 110 to 125°C, - a xylene cold insoluble content of from 60 to 80 wt.-%, preferably 70 to 80 wt.-% (ISO 16152, 1ed, 25°C), and - a xylene cold soluble content of 20 to 40 wt.-%, preferably 20 to 30 wt.-% (ISO 16152, 1ed, 25°C), wherein the xylene cold insoluble content and the xylene cold soluble content add up to 100 wt.-%. - a content of units derived from ethylene in the xylene cold insoluble content of from 2.0 to 6.0 wt.-%, preferably 2.3 to 3.5 wt.-% and - a content of units derived from ethylene in the xylene cold soluble content of 20.0 to 40.0 wt.-%, preferably of 25.0 to 35.0 wt.%; - a melt flow rate MFR 2 (230°C, ISO1133) of 2.0 to 30 g/10min, and - at least one melting point Tm1 in the range of 154 to 168°C, - optionally a second melting point Tm2 in the range of 130 to 160°C, - optionally a second or third melting point Tm3 in the range of 110 to 125°C, - a xylene cold insoluble content of from 60 to 80 wt.-%, preferably 70 to 80 wt.-% (ISO 16152, 1ed, 25°C), and - a xylene cold soluble content of 20 to 40 wt.-%, preferably 20 to 30 wt.-% (ISO 16152, 1ed, 25°C), wherein the xylene cold insoluble content and the xylene cold soluble content add up to 100 wt.-%. - a content of units derived from ethylene in the xylene cold insoluble content of from 2.0 to 6.0 wt.-%, preferably 2.3 to 3.5 wt.-% and - a content of units derived from ethylene in the xylene cold soluble content of 20.0 to 40.0 wt.-%, preferably of 25.0 to 35.0 wt.%; the xylene cold soluble content having an intrinsic viscosity (measured in decalin according to DIN ISO 1628/1 at 135°C) of 2.1 dl/g to less than 6.0 dl/g, preferably 3.0 to 5.0 dl/g, more preferably 3.3 to 4.3 dl/g, and whereby optionally the heterophasic copolymer has a tensile modulus of at least 650 MPa (measured according to ISO 527-2).