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1. (WO2018122033) POLYPROPYLENE COMPOSITION COMBINING LOW SEALING INITIATION TEMPERATURE AND HIGH MELTING TEMPERATURE
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Claims

1 . Polypropylene composition being a binary blend comprising two propylene polymer fractions PPF1 and PPF2 in specific amounts:

a) less than or equal to 50 wt% of propylene polymer fraction PPF1 being a propylene copolymer comprising propylene monomers and 1 .50 to 7.00 mol% of one comonomer selected from C4-C10 alpha-olefin

and

b) more than or equal to 50 wt% of propylene polymer fraction PPF2 being a propylene terpolymer comprising propylene monomers, 3.00 to 12.00 mol% of ethylene comonomer and 1.50 to 17.00 mol% of one comonomer selected from C4-C10 alpha- olefin, characterized in that the polypropylene composition:

i. has a melting temperature (Tm) in the range of 135 to 160 °C as determined by DSC according to ISO 1 1357.

ii. satisfies the equation:

Delta =Tm - SIT

wherein Delta is in the range of 39 to 50 °C, and wherein

Tm is the melting temperature, in °C, of the polypropylene composition,

SIT is the sealing initiation temperature, in °C, of the polypropylene composition, as calculated from pellets via DSC analysis,

the amount of PPF1 and PPF2 being relative to the total sum of the propylene polymer fractions PPF1 and PPF2.

2. Polypropylene composition according to claim 1 , characterized in that the polypropylene composition has an MFR2 in the range of 3.0 to 10.0 g/10min, as measured at 230 °C under a load of 2.16 kg according to ISO 1 133.

3. Polypropylene composition according to any one of claims 1 to 2, characterized in that the polypropylene composition has amount of xylene soluble (XS) in the range of 15 to

40 wt%, as determined at 25 °C according ISO 16152; 5th edition; 2005-07-01 .

4. Polypropylene composition according to any one of claims 1 to 3, wherein the composition is obtainable, preferably obtained in the presence of a Ziegler-Natta catalyst.

5. Polypropylene composition according to any one of claims 1 to 4, wherein the Ziegler-Natta catalyst is free of phthalic compound.

6. Polypropylene composition according to any one of claims 1 to 5 characterized in that the propylene polymer fraction PPF1 is a propylene copolymer comprising 1 -butene (C4) and the propylene polymer fraction PPF2 is a propylene terpolymer comprising ethylene comonomer and 1 -butene (C4).

7. Process for producing the polypropylene composition according to claim 1 by a sequential polymerisation process comprising at least two reactors connected in series, said process comprising the steps:

a) polymerising in a first reactor being a slurry reactor, preferably a loop reactor (R-1 ), propylene and one comonomer selected from C4-Cio alpha-olefin obtaining a propylene polymer fraction (PPF1 ), being a propylene copolymer as defined in claim 1

b) transferring the propylene polymer fraction (PPF1 ) and unreacted comonomers of the reactor (R-1 ) into a second reactor (R-2) being a first gas-phase reactor-1

(GPR-1 ),

c) in the gas-phase reactor-1 (GPR-1 ) propylene, ethylene and one comonomer selected from C4-Cio alpha-olefin are polymerised in the presence of the propylene polymer fraction (PPF1 ), obtaining a propylene polymer fraction (PPF2), being a propylene terpolymer as defined in claim 1 , said propylene polymer fraction (PPF2) and the propylene polymer fraction (PPF1 ) forming the polypropylene composition according to claim 1 ,

d) recovering the polypropylene composition according to claim 1.

8. An article comprising the polypropylene composition according to any one of claims 1 to 6.

9. A film comprising the polypropylene composition according to any one of claims 1 to 6.

10. The film according to claim 9 wherein said film is a blown film or a cast film.

1 1 . The film according to any one of claims 9 to 10 wherein said film is a multilayer film.

12. Use of the polypropylene composition according to any one of claims 1 to 6 for producing an article, a film or a multilayer film.