Propylene copolymer for thin-wall packaging

1. Propylene copolymer (R-PP) having:

(a) a comonomer content in the range of 2.0 to 11.0 mol. %;

(b) a melt flow rate MFR2 (230° C.) measured according to ISO 1133 in the range of 25.0 to 100 g/10 min; and

(c) a relative content of isolated to block ethylene sequences (I(E)) in the range of 55.0 to 70.0%, wherein the I(E) content is defined by equation (I):

I

⁡

(

E

)

=

fPEP

(

fEEE

+

fPEE

+

fPEP

)

×

100

(

I

)

wherein:

I(E) is the relative content of isolated to block ethylene sequences [in%];

fPEP is the mol fraction of propylene/ethylene/propylene sequences (PEP) in the sample;

fPEE is the mol fraction of propylene/ethylene/ethylene sequences (PEE) and of ethylene/ethylene/propylene sequences (EEP) in the sample;

fEEE is the mol fraction of ethylene/ethylene/ethylene sequences (EEE) in the sample

wherein all sequence concentrations being based on a statistical triad analysis of 13 C-NMR data.

2. Propylene copolymer (R-PP) according to claim 1 , wherein said propylene copolymer (R-PP) has a xylene cold soluble fraction (XCS) in the range of 4.0 to 25.0 wt. %.

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

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

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

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

(a) a main melting temperature in the range of 133 to 155° C.; and/or

(b) a crystallization temperature in the range of 110 to 128° C.

5. Propylene copolymer (R-PP) according to claim 1 , wherein said propylene copolymer (R-PP) has:

(a) has 2,1 regio-defects of at most 0.4% determined by 13 C-NMR spectroscopy; and/or

(b) is monophasic.

6. Propylene copolymer (R-PP) according to claim 1 , wherein the comonomer is selected from ethylene, C 4 to C 12 α-olefin, or mixtures thereof.

7. Propylene copolymer (R-PP) 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 comonomer content.

8. Propylene copolymer (R-PP) according to claim 7 , 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 the same and are selected from ethylene, C 4 to C 12 α-olefin, or mixtures thereof.

9. Propylene copolymer (R-PP) according to claim 7 , wherein:

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.

10. Propylene copolymer (R-PP) according to claim 7 , wherein:

(a) the first propylene copolymer fraction (R-PP1) has a comonomer content in the range of 1.0 to 6.0 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 6.0 to 14.0 mol % based on the second propylene copolymer fraction (R-PP2).

11. Propylene copolymer (R-PP) according to claim 7 , wherein:

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

Co

⁡

(

R

-

PP

⁢

⁢

2

)

Co

⁡

(

R

-

PP

⁢

⁢

1

)

≥

1.0

;

(

IV

)

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 propylene copolymer fraction (R-PP1) and the propylene copolymer fraction (R-PP) fulfill together the inequality (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 (R-PP).

12. Injection molded article comprising a propylene copolymer according to claim 1 .

13. Thin wall packaging made by injection molding, comprising a propylene copolymer according to claim 1 .

14. Process for producing a propylene copolymer (R-PP) according to claim 1 , wherein the process comprises polymerizing propylene in the presence of:

(a) a Ziegler-Natta catalyst (ZN-C) comprises a titanium compound (TC), a magnesium compound (MC) and an internal donor (ID), wherein said internal donor (ID) is a non-phthalic acid ester,

(b) optionally a co-catalyst (Co), and

(c) optionally an external donor (ED).

15. Process according to claim 14 , wherein:

(a) the internal donor (ID) is selected from optionally substituted malonates, maleates, succinates, glutarates, cyclohexene-1,2-dicarboxylates, benzoates and derivatives or mixtures thereof;

(b) the molar-ratio of co-catalyst (Co) to external donor (ED) [Co/ED] is 5 to 45.

16. Process according to claim 14 , wherein the process comprises polymerizing propylene in a sequential polymerization process comprising at least two reactors (R1) and (R2), in the first reactor (R1) the first propylene copolymer fraction (R-PP1) is produced and subsequently transferred into the second reactor (R2), in the second reactor (R2) the second propylene copolymer fraction (R-PP2) is produced in the presence of the first propylene copolymer fraction (R-PP1).