| abstract |
The present invention contains a propylene-based polymer (A) satisfying the following (a), a soft propylene-based copolymer (B) satisfying the following (b), and structural units derived from an unsaturated carboxylic acid and / or a derivative thereof (C) is a polypropylene-based resin composition containing (A) The melting point observed in differential scanning calorimetry is 100 ° C. or higher. (B) MFR measured at 230 ° C. under 2.16 kg load according to ASTM D-1238 is in the range of 0.01 to 100 g / 10 min, and the following requirements (b-1) and (b-2) Meet at least one of the (B-1) The syndiotactic triad fraction (rr fraction) measured by 13 C-NMR method is 60% or more. (B-2) A structural unit derived from at least one olefin selected from α-olefins having 2 to 20 carbon atoms (excluding propylene), containing a structural unit derived from propylene in an amount of 55 to 90% by mole In an amount of 10 to 45 mol% (wherein the total of structural units derived from propylene and structural units derived from α-olefin having 2 to 20 carbon atoms (excluding propylene) is 100 mol%), The limiting viscosity [η] (dL / g) measured in decalin at 135 ° C. and the MFR (g / 10 min, 230 ° C., 2.16 kg load) have a relational expression: 1.50 × MFR−0.20 ≦ [η] ≦ 2.65 × MFR−0.20 is satisfied. A single layer or multilayer film including a layer formed from the polypropylene resin composition of the present invention is excellent in whitening resistance at the time of deformation processing, and is used as a food packaging material, an architectural material, an exterior body of a lithium ion battery, etc. It can be suitably used as a packaging material to be formed. |