Polypropylene composition
View Patent ↗The present invention is directed to a polypropylene composition (C) comprising abase polymer being a first polypropylene (PP1) and a second polypropylene (PP2). The present invention is further directed to a film and a fiber comprising said polypropylene composition (C).
1. A polypropylene composition (C), comprising
i) 80.0 to 99.5 wt.-%, based on the overall weight of the polypropylene composition (C), of a first polypropylene (PP1), and
ii) 0.5 to 20.0 wt.-%, based on the overall weight of the polypropylene composition (C), of a second polypropylene (PP2) which is a propylene homopolymer different from the first polypropylene (PP1) and has a melting temperature Tm of 130° C. or less,
wherein said first polypropylene (PP1) fulfils in-equation (I)
C 7(PP1)− C 6(PP1)≤1.5 (I)
wherein
C7(PP1) is the amount of heptane solubles [in wt.-%] within the first polypropylene (PP1) and
C6(PP1) is the amount of hexane solubles [in wt.-%] within the first polypropylene (PP1), and
wherein the polypropylene composition (C) fulfils in-equation (II)
1.5<[ C 7( C )− C 6( C )]≤5.0 (II)
wherein
C7(C) is the amount of heptane solubles [in wt.-%] within the polypropylene composition (C) and
C6(C) is the amount of hexane solubles [in wt. %] within polypropylene composition (C).
2. The polypropylene composition (C) according to claim 1 , having a comonomer content in the range of 0.0 to 5.0 mol-%.
3. The polypropylene composition (C) according to claim 1 , wherein the first polypropylene (PP1) is a propylene homopolymer (H-PP1) or a random propylene copolymer (R-PP1).
4. The polypropylene composition (C) according to claim 1 , having a xylene soluble content (XCS) below 10.0 wt.-%.
5. The polypropylene composition (C) according to claim 1 , wherein the second polypropylene (PP2) has a molecular weight distribution Mw/Mn in the range of 1.0 to 4.0.
6. The polypropylene composition (C) according to claim 1 , wherein the second polypropylene (PP2) has a weight average molecular weight Mw in the range of 20 to 300 kg/mol.
7. The polypropylene composition (C) according to claim 1 , wherein the second polypropylene (PP2) has a density below 895 kg/m 3 .
8. The polypropylene composition (C) according to claim 1 , wherein the second polypropylene (PP2) has a melting temperature Tm in the range of 50 to 125° C.
9. The polypropylene composition (C) according to claim 1 , not comprising (a) further polymeric material different to the first polypropylene (PP1) and the second polypropylene (PP2) in an amount exceeding 5.0 wt.-%, based on the overall weight of the polypropylene composition (C).
10. An article comprising the polypropylene composition (C) according to claim 1 .
11. The article according to claim 10 , wherein said article is a film.
12. The article according to claim 11 , wherein said film is a biaxially oriented film (BOPP).
13. The article according to claim 10 , wherein said article is a fiber.
14. The article according to claim 13 , wherein said fiber is a melt spun fiber or a spunbonded fiber.