Polypropylene composition with outstanding impact performance
The present invention is directed to a polypropylene composition (C) comprising a polypropylene matrix, a dispersed phase comprising two different elastomeric ethylene copolymers and an inorganic filler. The present invention is further directed to an article comprising said polypropylene composition (C).
1. A polypropylene composition (C) having a melt flow rate MFR 2 (230° C., 2.16 kg) determined according to ISO 1133 in the range of 15.0 to 40.0 g/10 min, comprising:
i) 45.0 to 80.0 wt. % of a matrix (M) comprising a propylene polymer (PP1),
ii) 15.0 to 40.0 wt. % of an elastomeric fraction (E) dispersed within said matrix (M), comprising
a) a first elastomeric ethylene copolymer (E1) having an ethylene content of at least 30.0 mol %, and
b) a second elastomeric ethylene copolymer (E2) having an ethylene content equal or below 30.0 mol %, and
iii) an inorganic filler (F).
2. The polypropylene composition (C) according to claim 1 , wherein the elastomeric fraction (E) comprises the first elastomeric ethylene copolymer (E1) and the second elastomeric ethylene copolymer (E2) in a weight ratio of 2:1 to 10:1.
3. The polypropylene composition (C) according to claim 1 , comprising:
i) 45.0 to 65.0 wt. % of the propylene polymer (PP1),
ii) 10.0 to 32.0 wt. % of the first elastomeric ethylene copolymer (E1),
iii) 0.5 to 10.0 wt. % of the second elastomeric ethylene copolymer (E2), and
iv) 15.0 to 30.0 wt. % of the inorganic filler,
based on the overall amount of the polypropylene composition (C).
4. The polypropylene composition (C) according to claim 1 , wherein the propylene polymer (PP1):
i) is a propylene homopolymer (H-PP1) and/or
ii) has a melt flow rate MFR 2 (230° C., 2.16 kg) determined according to ISO 1133 in the range of 20.0 to 200.0 g/10 min.
5. The polypropylene composition (C) according to claim 1 , wherein the first elastomeric ethylene copolymer (E1) is a copolymer of ethylene and a C4 to C20 α-olefin.
6. The polypropylene composition (C) according to claim 5 , wherein the first elastomeric ethylene copolymer (E1) has:
a) a melt flow rate MFR (190° C., 2.16 kg) measured according to ISO 1133 below 100.0 g/10 min,
b) a C4 to C20 α-olefin content, based on the total weight of the first elastomeric ethylene copolymer (E1), in the range of 5.5 to 30.0 mol %, and/or
c) a density below 0.885 g/cm 3 .
7. The polypropylene composition (C) according to claim 5 , wherein the first elastomeric ethylene copolymer (E1) is a copolymer of ethylene and 1-butene or 1-octene.
8. The polypropylene composition (C) according to claim 1 , wherein the second ethylene copolymer (E2) is a copolymer of propylene and ethylene.
9. The polypropylene composition (C) according to claim 8 , wherein the second ethylene copolymer (E2) has:
a) a propylene content of at least 60.0 mol %,
b) a density below 0.870 g/cm 3 , and/or
c) a melt flow rate MFR (190° C., 2.16 kg) measured according to ISO 1133 in the range of 0.5 to 15.0 g/10 min.
10. The polypropylene composition (C) according to claim 1 , wherein the inorganic filler (F) is talc.
11. The polypropylene composition (C) according to claim 1 , wherein the first elastomeric ethylene copolymer (E1) and the second ethylene copolymer (E2) do not contain monomer units derivable from styrene or derivatives thereof.
12. An article comprising the polypropylene composition (C) according to claim 1 .
13. The article according to claim 12 , wherein the article is a moulded article.
14. The article according to claim 12 , comprising at least 60 wt. % of the polypropylene composition (C).