Polyolefin composition with high flowability rigidity and high resistance to perforation

摘要

Polyolefin composition comprising (a) a first heterophasic propylene copolymer (HECO1) having (i) a melt flow rate MFR2 (230 ° C) measured according to ISO 1133 in the range of 40.0 to 60, 0 g / 10 min, and (ii) a content of xylene solubles cold (XCS), determined according to ISO 16152 (25 ° C), of at least 15% by weight, wherein further (iii) the intrinsic viscosity (IV), determined according to DIN ISO 1628/1 (in decalin at 135 ° C) fraction soluble in xylene cold (XCS) of the heterophasic propylene copolymer (HECO1) is in the range of from 2.5 to 4.3 dl / g, and (b) a second heterophasic propylene copolymer (HECO2) comprising a propylene homopolymer (H-PP2) and an elastomeric propylene copolymer (E2), wherein (i) said second heterophasic propylene copolymer (HECO2) has a melt flow rate MFR2 (230 ° C) measured according to ISO 1133 in the range of above 1.0 to 8 , 0 g / 10 min; (Ii) the fraction soluble in cold xylene (XCS) of the second heterophasic propylene copolymer (HECO2) has an intrinsic viscosity determined according to DIN ISO 1628/1 (in decalin at 135 ° C), in the range of more than 3.7 to 9.0 dl / g; and (iii) the comonomer content of fraction soluble in xylene cold (XCS) of the second heterophasic propylene copolymer (HECO2) is in the range of 10.0 to 40.0% by weight, wherein - the relationship by weight of the first heterophasic propylene copolymer (HECO1) and the second heterophasic propylene copolymer (HECO2) [(HECO1) / (HECO2)] is in the range of 9: 1 to 200: 1; and / or - the amount of second heterophasic propylene copolymer (HECO2) in the polyolefin composition is equal or less than 10% by weight, based on the total weight of the polyolefin composition.