Patent ID: 7884159

Claim:
A propylene polymer composition (X) comprising at least two kinds of propylene (co)polymers, wherein the composition comprises 10 to 90% by weight of a propylene (co)polymer (A) which has a melting point in the range of 110 to 170° C., a melt flow rate (MFR) measured at 230° C. in the range of 0.01 to 10 g/10 min and a melt tension in the range of 30 to 200 mN and 90 to 10% by weight of a copolymer (B) of propylene and an α-olefin having 2 to 20 carbon atoms (excluding propylene) which has a melting point in the range of 40 to 100° C. and a melt flow rate (MFR) measured at 230° C. in the range of 0.5 to 50 g/10′ min and wherein the composition contains a constitutional unit derived from propylene at a ratio of 70 to 100 mol %, provided that the sum of all the constitutional units of the polymer is 100 mol %, wherein said propylene polymer composition (X) has a flexural modulus in the range of 200 to 1200 MPa and a melt flow rate (MFR) measured at 230° C. in the range of 0.1 to 30 g/10 min, and a melt tension (MT (mN)) measured under the conditions of a take-off rate of 15 m/min and an MFR (g/10 min) measured at 230° C. satisfy the following formula: −0.773 log(MFR)+1.55≦log(MT)≦−0.773 log(MFR)+3.0.