Heterophasic propylene copolymers with stiffness/impact/flowability balance
Abstract:
Heterophasic propylene copolymer (HECO) comprising: (a) a polypropylene matrix comprising: (a1) a first propylene homopolymer fraction (PPH1) with a melt flow rate MFR2 (230° C.) measured according to ISO 1133 in the range of >200 to 500 g/10 min, (a2-1) a second propylene homopolymer fraction (PPH2) with a melt flow rate MFR2 (230° C.) measured according to ISO 1133 in the range of >30 to ≦200 g/10 min or, (a2-2) a second propylene homopolymer fraction (PPH2) with a melt flow rate MFR2 (230° C.) measured according to ISO 1133 in the range of >5 to ≦30 g/10 min and, (a3-1) a third propylene homopolymer fraction (PPH3) with a melt flow rate MFR2 (230° C.) measured according to ISO 1133 in the range of 0.03 to ≦5 g/10 min, if the second propylene homopolymer fraction is fraction (a2-1) or, (a3-2) a third propylene homopolymer fraction (PPH3) with a melt flow rate MFR2 (230° C.) measured according to ISO 1133 in the range of >30 to ≦200 g/10 min, if the second propylene homopolymer fraction is fraction (a2-2), wherein the polypropylene matrix has a melt flow rate MFR2 (230° C.) measured according to ISO 1133 in the range of 30 to 500 g/10 min and a xylene cold soluble fraction determined at 23° C. according to ISO 6427 in the range of 0.5 to
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