Polypropylene composition

1. A polypropylene composition comprising a blend of:

(A) 85.0 to 95.0 wt. % of a heterophasic propylene copolymer (HECO) comprising:

(A-1) 80.0 to 90.0 wt. % of a matrix (M) that is a propylene homopolymer (H-PP) with an MFR 2 (230° C., 2.16 kg, ISO1133) of from 0.8-10.0 g/10 min and

(A-2) 10.0 to 20.0 wt. % of an elastomeric propylene copolymer (EPC) dispersed in said matrix (M),

wherein said heterophasic propylene copolymer has a xylene cold soluble (XCS) fraction having a C2 content of from 15.0 to 30.0 wt. % and an intrinsic viscosity (IV; determined according to DIN ISO 1628/1 in decalin at 135° C.) of from 1.2 to 2.6 dl/g;

(B) 5.0 to 15.0 wt. % of a propylene-hexene random copolymer with a hexene content in the range of from 2.0 to 10.0 wt. % and an MFR 2 (230° C., 2.16 kg, ISO1133) in a range of from 1.0 to 20.0 g/10 min; and

(C) optionally an alpha nucleating agent.

2. The polypropylene composition according to claim 1 , wherein the composition has a total hexene content of from 0.1 to 1.5 wt. % and an MFR 2 (230° C., 2.16 kg, ISO1133) of from 1.0 to 15.0 g/10 min.

3. The polypropylene composition according to claim 1 , wherein the composition has a hexane soluble value (C6FDA) of ≤3.0 wt. %.

4. The polypropylene composition according to claim 1 , wherein the composition has a total hexene content of from 0.1 to 1.5 wt. % and a total ethylene content of from 1.5 to 6.2 wt. %.

5. The polypropylene composition according to claim 1 , wherein the composition has:

(i) a Flexural Modulus according to ISO 178 in a range of from 1000 to 1800 MPa,

(ii) a Charpy notched impact strength NIS +23° C. according to ISO 179 in the range of from 25 to 75 kJ/m 2 , and

iii) a Charpy notched impact strength NIS −20° C. according to ISO 179 1eA in the range of from 1.5 to 5.0 kJ/m 2 .

6. A polypropylene composition according to claim 1 , wherein the composition has a haze according to ASTM D 1003-00 measured on a 1 mm thick injection molded specimen of ≤50.0%.

7. A process for the preparation of the polypropylene composition according to claim 1 , the process comprising the steps of;

(i) preparing a heterophasic propylene copolymer (HECO) (A) in the presence of a Ziegler-Natta catalyst;

(ii) preparing a propylene-hexene random copolymer (B) by polymerizing propylene and hexene in the presence of a single site catalyst;

(iii) mixing said heterophasic propylene copolymer (HECO) (A) with the propylene-hexene random copolymer (B) to obtain a mixture of (A) and (B); and

(iv) extruding said mixture to obtain the blend of (A) and (B).

8. An article comprising the polypropylene composition according to claim 1 or the polypropylene composition prepared by the process according to claim 7 .

9. The article according to claim 8 , wherein the article is an unoriented film comprising more than 90% of the blend according to claim 1 or the blend prepared by the process according to claim 7 , wherein the film is a cast film or a blown film.

10. The article according to claim 9 , wherein the film has been subjected to a sterilization treatment.

11. The article according to claim 9 , wherein the film a) before sterilization treatment has a haze (b.s.) determined on 50 μm cast film of below 10.0% and b) after sterilization treatment at 121° C. for 30 min has a haze (a.s.) value determined on 50 μm cast film of below 15.0.

12. The article according to claim 11 , wherein the film has a Δ(haze) value, defined as Δ(haze)=(haze(a.s.)−haze(b.s.))/haze(b.s.)*100%, of below 10%.

13. The article according to claim 9 , wherein the film has a tensile modulus in machine (MD) direction determined according to ISO 527-3 on a 50 μm cast film in the range of from 750 to 1500 MPa.