Compatibilization of recycled polyethylene-polypropylene blends

1. A polyethylene-polypropylene composition, obtained by blending:

a) 85.0 to 99.0 wt. %, based on an overall weight of the polyethylene-polypropylene composition, of a blend (A) comprising:

i) polypropylene, and

ii) polyethylene,

wherein a weight ratio of polypropylene to polyethylene is in a range of 3:7 to 7:3, and

wherein blend (A) is a recycled material, which is recovered from a waste plastic material derived from post-consumer and/or industrial waste;

and

b) 1.0 to 15.0 wt. %, based on the overall weight of the polyethylene-polypropylene composition, of a compatibilizer (B) which is a C 2 C 3 C 4 terpolymer having a density determined according to ISO 1183 equal or below 880 kg/m 3 .

2. The polyethylene-polypropylene composition according to claim 1 , wherein the C 2 C 3 C 4 terpolymer has a melt flow rate MFR 2 (230° C., 2.16 kg) determined according to ISO 1133 in a range of 2.0 to 40.0 g/10 min.

3. The polyethylene-polypropylene composition according to claim 1 , wherein a weight ratio between the blend (A) and the compatibilizer (B) is in a range of 99:1 to 5:1.

4. The polyethylene-polypropylene composition according to claim 1 , wherein the C 2 C 3 C 4 terpolymer has:

i) an ethylene content in a range of 2.0 to 15.0 wt. %, and/or

ii) a 1-butene content in a range of 5.0 to 30.0 wt. %, based on an overall weight of the C 2 C 3 C 4 terpolymer.

5. The polyethylene-polypropylene composition according to claim 1 , wherein the C 2 C 3 C 4 terpolymer has a melting temperature Tm determined according to ISO 11357-below 180° C. a range of 150 to 165° C.

6. The polyethylene-polypropylene composition according to claim 1 , wherein the C 2 C 3 C 4 terpolymer has a glass transition temperature Tg-below −5° C. in a range of −25 to −12° C.

7. The polyethylene-polypropylene composition according to claim 1 , wherein blend (A) has a content of limonene as determined by using solid phase microextraction (HS-SPME-GC-MS) of

(i) from 1 ppm-to 100 ppm or

(ii) from 0.10 ppm to less than 1 ppm.

8. The polyethylene-polypropylene composition according to claim 1 , wherein blend (A) has a relative amount of units derived from ethylene of greater than 20 wt. %, based on an overall weight of blend (A).

9. The polyethylene-polypropylene composition according to claim 1 , wherein blend (A) contains:

i) up to 6.0 wt. % polystyrene, and/or

ii) up to 3 wt. % talc, and/or

iii) up to 5.0 wt. %, polyamide, and/or

iv) up to 3 wt. % chalk,

based on an overall weight of blend (A).

10. The polyethylene-polypropylene composition according to claim 1 , having a melt flow rate MFR 2 (230° C., 2.16 kg) determined according to ISO 1133 in a range of 0.1 to 50.0 g/10 min.

11. The polyethylene-polypropylene composition according to claim 1 , having a Charpy notched impact strength determined according to ISO 179/1eA at 23° C. of at least 6.0 KJ/m 2 .

12. The polyethylene-polypropylene composition according to claim 1 , having a tensile modulus determined according to ISO 527-2 of at least 600 MPa.

13. An article, comprising the polyethylene-*polypropylene composition according to claim 1 .

14. A process for preparing the polyethylene-polypropylene composition according to claim 1 , comprising the steps of:

a) providing the blend (A) in an amount of 85.0 to 99.0 wt. %, based on the overall weight of the polyethylene-polypropylene composition,

b) providing the compatibilizer (B) in an amount of 1.0 to 15.0 wt. %, based on the overall weight of the polyethylene-polypropylene composition,

c) melting and mixing a blend of blend (A) and the compatibilizer (B), optionally in the presence of 0 to 1.0 wt. % of a stabilizer or a mixture of stabilizers, and

d) optionally pelletizing.