HETEROPHASIC PROPYLENE COPOLYMER WITH EXCELLENT IMPACT/STIFFNESS BALANCE

摘要

Heterophasic propylene copolymer comprising
- a matrix (M) being a polypropylene, said polypropylene comprises at least three polypropylene fractions, the three polypropylene fractions differ from each other by the melt flow rate MFR 2 (230 °C) and at least one of the three polypropylene fractions has a melt flow rate MFR 2 (230 °C) in the range of 1.0 to 15.0 g/10min, and
- an elastomeric propylene copolymer dispersed in said matrix,
wherein
- the heterophasic propylene copolymer has a melt flow rate MFR 2 (230 °C) of equal or more than 20.0 g/10min, 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.