Blow molded article with good mechanical and optical properties

1. Blow molded article comprising at least 75.0 wt. % based on the total weight of the blow molded article, of a propylene copolymer (R-PP), wherein the blow molded article and/or the propylene copolymer (R-PP) has/have:

(a) a melt flow rate MFR 2 (230° C.) measured according to ISO 1133 in the range of more than 2.0 to 12.0 g/10 min,

(b) a comonomer content in the range of 4.0 to below 14.0 mol. %,

(c) a melting temperature in the range of 125 to below 143° C., and

(d) a xylene cold soluble fraction (XCS) in the range of above 15.0 to 40.0 wt. %.

2. Blow molded article according to claim 1 , wherein the comonomer of the propylene copolymer (R-PP) is selected from ethylene, C 4 to C 12 α-olefin, and mixtures thereof.

3. Blow molded article according to claim 1 , wherein said propylene copolymer (R-PP) has:

(a) a glass transition temperature in the range of −12° C. to +2° C.; and/or

(b) no glass transition temperature below −20° C.

4. Blow molded article according to claim 1 , wherein said propylene copolymer (R-PP) has:

(a) a molecular weight distribution (Mw/Mn) of at least 2.7; and/or

(b) a polydispersity index (PI) of at least 2.3.

5. Blow molded article according claim 1 , wherein said propylene copolymer (R-PP):

(a) has 2,1 regio-defects of at least 0.2% determined by 13 C-NMR spectroscopy; and/or

(b) is monophasic.

6. Blow molded article according to claim 1 , wherein the blow molded article comprises said propylene copolymer (R-PP) in an amount of at least 80.0 wt. %, based on the total weight of the blow molded article.

7. Blow molded article according to claim 1 , wherein the blow molded article has a bottle appearance factor (BAF) before sterilization of in-equation (I):

BAF>180  (I),

wherein:

BAF is defined as:

BAF

-

C

⁢

⁢

x

⁢

⁢

G

R

wherein:

H is the haze value,

C is the clarity value,

G is the gloss value,

wherein further the haze, the clarity and the gloss are determined according to ASTM D 1003-07 on a test specimen cut from a bottle having a wall thickness of 0.3 mm made from said propylene copolymer (R-PP).

8. Blow molded article according to claim 1 , wherein said propylene copolymer (R-PP) comprises two fractions, a first propylene copolymer fraction (R-PP1) and a second propylene copolymer fraction (R-PP2), said first propylene copolymer fraction (R-PP1) differs from said second propylene copolymer fraction (R-PP2) in the melt flow rate MFR 2 (230° C.) and/or in the comonomer content.

9. Blow molded article according to claim 8 , wherein

(a) the weight ratio between the first propylene copolymer fraction (R-PP1) and the second propylene copolymer fraction (R-PP2) [(R-PP1):(R-PP2)] is 70:30 to 30:70; and/or

(b) the comonomers for the first propylene copolymer fraction (R-PP1) and the second propylene copolymer fraction (R-PP2) are selected from ethylene, C 4 to C 12 α-olefin, and mixtures thereof.

10. Blow molded article according to claim 8 , wherein:

(a) the first propylene copolymer fraction (R-PP1) is the comonomer lean fraction and the second propylene copolymer fraction (R-PP2) is the comonomer rich fraction; and/or,

(b) the first propylene copolymer fraction (R-PP1) has a lower melt flow rate MFR 2 (230° C.) than the second propylene copolymer fraction (R-PP2).

11. Blow molded article according to claims 8 , wherein:

(a) the first propylene copolymer fraction (R-PP1) has a lower comonomer content than the propylene copolymer (R-PP); and/or,

(b) the first propylene copolymer fraction (R-PP1) has a lower melt flow rate MFR 2 (230° C.) than the propylene copolymer (R-PP).

12. Blow molded article according to claim 8 , wherein

(a) the first propylene copolymer fraction (R-PP1) has a comonomer content in the range of 0.5 to 8.0 mol % based on the first propylene copolymer fraction (R-PP1); and/or,

(b) the second propylene copolymer fraction (R-PP2) has a comonomer content in the range of more than 8.0 to 20.0 mol % based on the second propylene copolymer fraction (R-PP2).

13. Blow molded article according to claim 8 , wherein:

(a) the first propylene copolymer fraction (R-PP1) has a melt flow rate MFR 2 (230° C.) in the range of 1.5 to 8.0 g/10 min; and/or,

(b) the second propylene copolymer fraction (R-PP2) has a melt flow rate MFR 2 (230° C.) in the range of more than 2.0 to 20.0 g/10 min.

14. Blow molded article according to claim 8 , wherein:

(a) the first random propylene copolymer fraction (R-PP1) and the second random propylene copolymer fraction (R-PP2) fulfill together the inequation (IV):

MFR

⁡

(

R

-

PP

⁢

⁢

2

)

MFR

⁢

⁢

(

R

-

PP

⁢

⁢

1

)

≥

1.1

(

IV

)

wherein:

MFR (R-PP1) is the melt flow rate MFR 2 (230° C.) [g/10 min] of the first propylene copolymer fraction (R-PP1),

MFR (R-PP2) is the melt flow rate MFR 2 (230° C.) [g/10 min] of the second propylene copolymer fraction (R-PP2); and/or,

(b) the first random propylene copolymer fraction (R-PP1) and the random propylene copolymer fraction (R-PP) fulfill together the inequation (VI):

MFR

⁢

⁢

(

R

-

PP

)

MFR

⁢

⁢

(

R

-

PP

⁢

⁢

1

)

>

1.0

(

VI

)

wherein:

MFR (R-PP1) is the melt flow rate MFR 2 (230° C.) [g/10 min] of the first propylene copolymer fraction (R-PP1),

MFR (R-PP) is the melt flow rate MFR 2 (230° C.) [g/10 min] of the propylene copolymer fraction (R-PP).

15. Blow molded article according to claim 8 , wherein:

(a) the first random propylene copolymer fraction (R-PP1) and the second random propylene copolymer fraction (R-PP2) fulfill together the inequation (III):

Co

⁢

⁢

(

R

-

PP

⁢

⁢

2

)

Co

⁢

⁢

(

R

-

PP

⁢

⁢

1

)

≥

2.0

;

(

III

)

wherein:

Co (R-PP1) is the comonomer content [mol. %] of the first propylene copolymer fraction (R-PP1),

Co (R-PP2) is the comonomer content [mol. %] of the second propylene copolymer fraction (R-PP2), and/or,

(b) the first random propylene copolymer fraction (R-PP1) and the random propylene copolymer fraction (R-PP) fulfill together the inequation (V):

Co

⁢

⁢

(

R

-

PP

)

Co

⁢

⁢

(

R

-

PP

⁢

⁢

1

)

>

1.0

(

V

)

wherein:

Co (R-PP1) is the comonomer content [mol. %] of the first propylene copolymer fraction (R-PP1),

Co (R-PP) is the comonomer content [mol. %] of the propylene copolymer fraction (R-PP).

16. Blow molded article according to claim 1 , wherein the blow molded article is an extrusion blow molded article.

17. Extrusion blow molded article according to claim 16 , wherein the extrusion blow molded article is a bottle or a container.