POLYPROPYLENE RESIN COMPOSITION AND SINGLE LAYER AND MULTILAYER FILM

The present invention is a polypropylene resin composition comprising a propylene polymer (A) satisfying (a) below, a soft propylene copolymer (B) satisfying (b) below, and a polyolefin (C) containing a structural unit derived from an unsaturated carboxylic acid and/or a derivative thereof, wherein (a) a melting point observed by differential scanning calorimetry is 100°C or more, and (b) an MFR measured at 230°C and a load of 2.16 kg according to ASTM D-1238 is in the range of 0.01 to 100 g/10 min, at least one of the following requirements (b-1) and (b-2) is satisfied: (b-1) a syndiotactic triad fraction (rr fraction) measured by 13C-NMR is 60% or more, and (b-2) a structural unit derived from propylene is contained at 55 to 90 mol % and a structural unit derived from at least one olefin selected from α-olefins having 2 to 20 carbon atoms (excluding propylene) is contained at 10 to 45 mol % (provided that a the total of the structural unit derived from propylene and the structural units derived from α-olefins having 2 to 20 carbon atoms (excluding propylene) is 100 mol %), and the relation between a intrinsic viscosity [η] (dL/g) measured at 135°C in decalin and the MFR (g/10 min, 230°C, load: 2.16 kg) satisfies the relation represented by an expression: 1.50 × MFR-0.20 ≤ [η] ≤ 2.65 × MFR-0.20. A monolayer film or multilayer film comprising a layer comprising the polypropylene resin composition according to the present invention has high whitening resistance during deformation processing, and can be suitably used as packaging materials for food products, construction materials, and packaging materials for lithium ion batteries.