Polypropylene-based resin composition containing ultrahigh molecular weight propylene (co)polymer

A polypropylene-based resin composition containing:

• a component (A1) being a propylene-ethylene copolymer having up to 30 wt % ethylene, having an intrinsic viscosity of more than 20 dl/g, as measured in a tetralin solvent at 135° C., and having a melting point determined using a differential scanning calorimeter (DSC) at a heating rate of 10° C./min, and the melting point, Tm (° C.), of the propylene-ethylene copolymer and the content of the ethylene in the propylene-ethylene copolymer, C2 (wt %), satisfy formula (1) below:
• Tm≥−3.4×C2+162 (1);
• and
• a component (A2) being a polymer selected from a group consisting of
• (A2-1) a propylene homopolymer,
• (A2-2) a random copolymer of propylene and an α-olefin having 2 or 4 to 8 carbon atoms,
• (A2-3) a block copolymer of propylene and an α-olefin having 2 or 4 to 8 carbon atoms, and
• a combination of the (A2-1), (A2-2), and (A2-3),
• and having a content of the component (A1) of 0.1 to 10 wt % and a content of the component (A2) of 99.9 to 90 wt % based on a total amount of the component (A1) and the component (A2), and
• the component (A2) having a melt flow rate (MFR) (230° C., load:
• 2.16 kg) of 1 to 500 g/10 min.