SCRATCH RESISTANCE POLYPROPYLENE AT HIGH FLOW

摘要

Injection molded article comprising at least 60 wt.-% of a heterophasic propylene copolymer, said polymer comprises a matrix being a polypropylene, said polypropylene comprises at least three polypropylene fractions, the three polypropylene fractions differ from each other by the melt flow rate and at least one of the three polypropylene fractions has a melt flow rate in the range of 1.0 to 20.0 g/10 min, and an elastomeric propylene copolymer dispersed in said matrix, wherein said heterophasic propylene copolymer has a melt flow rate of equal or more than 20.0 g/10 min and the amorphous phase of the xylene cold soluble fraction of the heterophasic propylene copolymer has an intrinsic viscosity of equal or higher than 2.0 dl/g.

主权项

1. An injection molded article comprising at least 60 wt.-% of a heterophasic propylene copolymer (HECO), said heterophasic propylene copolymer (HECO) comprising:
(a) a matrix (M) being a polypropylene (PP), said polypropylene (PP) comprises at least three polypropylene fractions (PP1), (PP2) and (PP3), the three polypropylene fractions (PP1), (PP2) and (PP3) differ from each other by the melt flow rate MFR2 (230° C.) measured according to ISO 1133 and at least one of the three polypropylene fractions (PP1), (PP2) and (PP3) has a melt flow rate MFR2 (230° C.) measured according to ISO 1133 in the range of 1.0 to 20.0 g/10 min, and (b) an elastomeric propylene copolymer (EC) dispersed in said matrix (M), wherein (i) said heterophasic propylene copolymer (HECO) has a melt flow rate MFR2 (230° C.) measured according to ISO 1133 of equal or more than 20.0 g/10 min, and (ii) the amorphous phase (AM) of the xylene cold soluble fraction (XCS) of the heterophasic propylene copolymer (HECO) has an intrinsic viscosity (IV) measured according to ISO 1628-1 (at 135° C. in decaline) of equal or higher than 2.0 dl/g.