THERMOPLASTIC POLYOLEFIN CONTAINING AMORPHOUS ETHYLENE ELASTOMER

摘要

Disclosed is a thermoplastic polyolefin composition useful in automotive components comprising at least a polypropylene having a melting point temperature (Tm) of greater than 130°C and a melt flow rate (230°C/2.16 kg) within the range from 10 g/10 min to 80 g/10 min; an amorphous ethylene-propylene copolymer comprising within the range from 40 wt% to 80 wt% ethylene derived units and having a melt flow rate (230°C/2.16 kg) within the range from 0.1 g/10 min to 20 g/10 min; and a propylene-based elastomer having within the range from 5 to 25 wt% ethylene derived units and having a Tm of less than 110°C. The composition only partially breaks or there is no break at -29°C (ASTM D256) with Notched Izod Force of between 10 to 40 ft-lb/in2at 22°C (533 to 2, 132 J/m2), and between 1.0 to 12 ft-lb/in2 at -29°C (53 to 636 J/m2).