Thermoplastic polymer compositions.

摘要

A thermoplastic polymer composition comprising: (i) 100 parts by weight of a thermoplastic polymer component consisting of 55 to 75% by weight of an ethylene-propylene block copolymer having a melt flow rate of 30 to 150 g/10 min (as measured at 230 DEG C under a load of 2.16 Kg), including a propylene homopolymer moiety having a melt flow rate of 50 to 300 g/10 min and an isotactic pentad fraction (P) of 0.98 or higher and 25 to 45% by weight of an ethylene copolymer having a melting point of 30 to 100 DEG C, and (ii) 1 to 25 parts by weight of talc having an average particle size of 5 mu m or less and a specific surface area of 3.5 m<2>/g or larger, the composition including a propylene homopolymer domain having an average lamella thickness of 8 nm or more, as observed under an electron microscope along the normal direction of the plane (100) or (010).