Disclosed is a propylene-ethylene block copolymer which is superior in
stiffness, hardness and moldability and also in balance between toughness and low-temperature
impact resistance. The copolymer contains from 60 to 85% by weight of a crystalline
polypropylene portion and from 15 to 40% by weight of a specific propylene-ethylene
random copolymer portion, wherein the propylene-ethylene block copolymer has a
melt flow rate (MFR) of from 5 to 120 g/10 min.
