Propylene copolymer for blow molded articles

1. A Ziegler-Natta catalyzed propylene copolymer having:

(a) a melt flow rate MFR 2 at 230° C. measured according to ISO 1133 in the range of more than 0.5 to below 2.5 g/10 min,

(b) a xylene cold soluble content (XCS) determined according ISO 16152 at 25° C. in the range of 30.0 to 40.0 wt. %,

(c) a comonomer content in the range of more than 7.5 to 12.0 wt. %,

wherein further;

the comonomer content of xylene cold soluble (XCS) fraction of the propylene copolymer is in the range of 16.0 to 28.0 wt. %.

2. The propylene copolymer according to claim 1 , wherein the propylene copolymer fulfills inequation (I):

Co

⁡

(

total

)

Co

⁡

(

XCS

)

≤

0.7

wherein;

Co (total) is the comonomer content [wt. %] of the propylene copolymer, and

Co (XCS) is the comonomer content [wt. %] of the xylene cold soluble fraction (XCS) of the propylene copolymer.

3. The propylene copolymer according to claim 1 , wherein the propylene copolymer has a melting temperature Tm determined by differential scanning calorimetry (DSC) in the range of 145 to 159° C.

4. The propylene copolymer according to claim 1 , wherein the propylene copolymer has an intrinsic viscosity (IV) of the xylene cold soluble (XCS) fraction determined according to DIN ISO 1628/1 in Decalin at 135° C. in the range of more than 1.8 to below 3.5 dl/g.

5. The propylene copolymer according to claim 1 , wherein the propylene copolymer has a flexural modulus measured according to ISO 178 of not more than 600 MPa.

6. The propylene copolymer according to claim 1 , wherein the propylene copolymer is a heterophasic propylene copolymer comprising a matrix (M) and an elastomeric propylene copolymer (E) dispersed in said matrix (M), wherein said matrix (M) is a random propylene copolymer (R-PP).

7. The propylene copolymer according to claim 6 , wherein the weight ratio between the matrix (M) and the elastomeric propylene copolymer (E) is 50/50 to 80/20.

8. The propylene copolymer according to claim 6 , wherein the comonomer content of the random propylene copolymer (R-PP) is in the range of 1.0 to 9.0 wt. %.

9. The propylene copolymer according to claim 6 , wherein the propylene copolymer fulfills inequation (II):

Co

⁡

(

total

)

Co

⁡

(

RPP

)

≥

1.1

wherein;

Co (total) is the comonomer content [wt. %] of the propylene copolymer, and

Co (RPP) is the comonomer content [wt. %] of the random propylene copolymer (R-PP).

10. The propylene copolymer according to claim 6 , wherein the random propylene copolymer (R-PP) has a xylene cold soluble (XCS) fraction in the range of 2.0 to 15.0 wt. %.

11. The propylene copolymer according to claim 6 , wherein the random propylene copolymer (R-PP) comprises at least two different fractions, a first random propylene copolymer fraction (R-PP1) and a second random propylene copolymer fraction (R-PP2).

12. The propylene copolymer according to claim 11 , wherein:

(a) the weight ratio between the first random propylene copolymer fraction (R-PP1) and the second random propylene copolymer fraction (R-PP2) is 20/80 to 80/20, and/or

(b) the first random propylene copolymer fraction (R-PP1) has a comonomer content in the range 0.5 to 5.0 wt. %, and/or

(c) the second random propylene copolymer fraction (R-PP2) has a commoner content in the range 0.5 to 15.0 wt. %.

13. The propylene copolymer according to claim 6 , wherein the elastomeric propylene copolymer (E) has a comonomer content in the range of 16.0 to 26.0 wt. %.

14. A blow molded article comprising the propylene copolymer according to claim 1 .

15. The blow molded article according to claim 14 , wherein the article is a bottle.