Heterophasic polypropylene composition

1. A heterophasic polypropylene composition comprising:

a. a crystalline matrix being a multimodal propylene random copolymer of ethylene and/or C4-C12 alpha-olefin(s) as further comonomers and

b. an amorphous propylene-ethylene elastomer optionally comprising of C4-C12 alpha-olefin(s) as further comonomers dispersed in said crystalline matrix (a),

wherein the heterophasic polypropylene composition is characterised by

i. a xylene cold solubles (XCS) fraction according to ISO 1652 in the range of 5.0 to 16.5 wt. %,

ii. an comonomer content of the XCS fraction (Co(XCS)) in the range of 8.0 to 16.5 wt. %,

iii. and optionally fulfilling the inequation

0.80≤ XCS/Co ( XCS )≤1.20,

wherein XCS denominates the xylene cold solubles fraction according to ISO 1652 in [wt. %] and Co(XCS) is the comonomer content of said XCS fraction in [wt. %].

2. The heterophasic polypropylene composition according to claim 1 comprising:

a. 80.0-90.0 wt. % of a crystalline matrix being a multimodal propylene random copolymer of ethylene and/or C4-C12 alpha-olefin(s) as further comonomers and

b. 10.0-20.0 wt. % of an amorphous propylene-ethylene elastomer optionally comprising of C4-C12 alpha-olefin(s) as further comonomers dispersed in said crystalline matrix (a).

3. The heterophasic propylene composition according to claim 2 , wherein the multimodal propylene random copolymer of ethylene and or alpha-olefins (a) comprises:

a1) 30.0-50.0 wt. %, based on the total weight of the heterophasic polypropylene composition, of a first polypropylene fraction being a propylene homopolymer or propylene-ethylene random copolymer,

optionally having a comonomer content in the range of 0.0-1.0 wt. %, and/or

a melt flow rate MFR2 in the range of 2.0-10.0 g/10 min, and

a2) 30.0-60.0 wt. %, based on the total weight of the heterophasic polypropylene composition, of a second polypropylene fraction being a propylene-ethylene random copolymer, and

optionally having a comonomer content in the range of above 1.0-7.0 wt. %, and/or

a melt flow rate MFR2 in the range of 0.2-2.0 g/10 min.

4. The heterophasic propylene composition according to claim 1 , wherein the heterophasic propylene composition comprises an intrinsic viscosity (IV) of the XCS fraction as determined according to DIN ISO 1628/1 in Decalin at 135° C. of less than 2.0 dl/g.

5. The heterophasic propylene composition according to claim 1 wherein,

a hexane-soluble fraction of at most 1.5 wt. % when determined according to FDA method and/or a comonomer content of 1.0-7.0 wt. %.

6. The heterophasic propylene composition according to claim 1 further comprising a 0.001-0.50 wt. % of an alpha-nucleating agent and/or having a MFR230/2.16 according to ISO1133 in the range of 0.3-3.5 g/10 min.

7. The heterophasic propylene composition according to claim 1 , having a melting point Tm of at least 145° C. and one glass transition temperature Tg in the range of (−15) to 0° C.

8. The heterophasic polypropylene composition according to claim 1 , comprising a flexural Modulus according to ISO178 of at least 900 MPa and/or Notched Impact Strength NIS determined according to ISO179/1 eA at +23° C. of 4.0-40.0 kJ/m 2 .

9. The heterophasic polypropylene composition according to claim 1 , consisting of a Haze 1 of at most 20.0% when measured according to ASTM D1003 on 1 mm injection moulded plaques.

10. A process for preparing the heterophasic polypropylene composition according to claim 1 by sequential polymerisation in the presence of a metallocene catalyst, wherein:

preparing a first polypropylene fraction being a propylene homopolymer or a propylene-ethylene random copolymer in a bulk phase reactor in a first polymerisation stage,

transferring said first polypropylene fraction to a second polymerisation stage in which a second polypropylene fraction being a propylene-ethylene random copolymer is prepared in a gas phase reactor (GPR1),

transferring the mixture comprising said first and second polypropylene fraction together to the third polymerisation stage in which the amorphous propylene ethylene elastomer is prepared in a gas phase reactor (GPR3), and

subjecting the mixture of said three polymers to a deactivation and purification step followed by compounding and pelletization.

11. The process according to claim 10 , wherein the:

MFR2 of the first polypropylene fraction produced in the first stage is in the range of 2.0 to 10.0 g/10 min,

the MFR2 of the second polypropylene fraction produced in the second stage is in the range of 0.2 to less than 2.0 g/10 min, and

the MFR2 of the amorphous propylene ethylene elastomer produced in the third stage is in the range of 8.0 to 200.0 g/10 min.

12. The process according to claim 10 , wherein:

the ethylene content of the first polypropylene fraction produced in the first stage is in the range of 0.0 to 1.0 wt. %,

the ethylene content of the second polypropylene fraction produced in the second stage is in the range of more than 1.0 to 7.0 wt. %, and

the ethylene content of the amorphous propylene ethylene elastomer produced in the third stage is in the range of 9.0 to 25.0 wt. %.

13. A heterophasic polypropylene composition produced according to claim 10 .

14. A moulded article comprising the heterophasic polypropylene composition according to claim 1 .

15. The moulded article of claim 13 , being used for alimentary, packaging, medical, healthcare, pharmaceutical or diagnostic applications.

16. The moulded article according to claim 14 , wherein the moulded article is a container, a bottle, or an ampoule.