Propylene-based polymer composition, use thereof, and method for producing thermoplastic polymer composition

A propylene-based polymer composition (P) comprising:

• 66 to 88 parts by weight of a propylene-based polymer (A) that contains 93.4 to 100 mol % of constitutional units derived from propylene and 0 to 6.6 mol % of constitutional units derived from an α-olefin having 4 to 20 carbon atoms and/or ethylene, provided that the total of propylene and ethylene and/or the α-olefin is 100 mol %, wherein (A) has a Tm measured by DSC of not less than 120° C. and not more than 170° C.,
• 12 to 34 parts by weight of a propylene/ethylene/α-olefin copolymer (B) that contains 61.0 to 74.9 mol % of constitutional units derived from propylene, 17.0 to 18.5 mol % of constitutional units derived from ethylene, and 3.0 to 7.0 mol % of constitutional units derived from an α-olefin having 4 to 20 carbon atoms, provided that the total of propylene, ethylene, and α-olefin is 100 mol %, wherein the copolymer (B) has an isotactic triad fraction (mm fraction) measured by NMR of not less than 85% and has a B-value, which is defined below, of not less than 0.9 and not more than 1.1,
• 25 to 88 parts by weight relative to 100 parts by weight of the total of (A) and (B) of an ethylene/α-olefin copolymer (C) that contains 82 to 92 mol % of constitutional units derived from ethylene and 8 to 18 mol % of constitutional units derived from an α-olefin having 3 to 20 carbon atoms, provided that the total of ethylene and the α-olefin is 100 mol %, wherein (C) has a density of 850 to 920 kg/m3 and an MFR (ASTM D1238, 190° C. load of 2.16 kg) of 0.1 to 10 g/10 min,
• B=MOE/(2MO·ME),
• wherein MOE is the molar fraction of the total of propylene-ethylene dyad sequences and α-olefin having 4 or more carbon atoms-ethylene dyad sequences to all the dyad sequences, Mo is the total of the molar fractions of propylene and the α-olefin having 4 or more carbon atoms, and ME is the molar fraction of ethylene, and
• an internal haze of the composition after annealing at 120° C. is not more than 50%.