| abstract |
The resin composition of the present invention contains 35 to 59.9 parts by mass of a propylene-based polymer (A) satisfying the following (a), 25 to 40 parts by mass of a soft propylene-based copolymer (B) satisfying the following (b), and unsaturated 0.1 to 10 parts by mass of a polyolefin (C) containing a structural unit derived from carboxylic acid and/or a derivative thereof, and 15 to 30 parts by mass of an ethylene-based polymer (D) satisfying the following (d) (provided that (A) ), (B), (C) and (D) are taken as 100 parts by mass), MFR measured at 230°C and 2.16 kg load in accordance with ASTM D-1238 is 7 g/10 min or more and 25 g/10 min or less to be. (a) The melting point (Tm) observed in differential scanning calorimetry is 120°C or higher. (b) MFR measured at 230°C and 2.16 kg load in accordance with ASTM D-1238 is in the range of 0.01 to 100 g/10 min, and also satisfies the following requirements (b-1) and (b-2). (b-1) The melting point (Tm) observed in differential scanning calorimetry is 110° C. or less, or the melting point is not observed. (b-2) having a structural unit derived from propylene and a structural unit derived from at least one olefin selected from ethylene and α-olefins having 4 to 20 carbon atoms, and having a structural unit derived from ethylene and 4 to 20 carbon atoms The content of the structural unit derived from at least one selected α-olefin is 30 mol% or less, and the isotactic triad fraction (mm fraction) measured by 13 C-NMR is 80% or more. (d) an ethylene homopolymer or a copolymer of ethylene and at least one α-olefin selected from α-olefins having 3 to 20 carbon atoms, measured at 190° C. under a load of 2.16 kg in accordance with ASTM D-1238 The MFR is in the range of 0.1 to 10 g/10 min. A single-layer or multi-layer film comprising a layer formed from the resin composition of the present invention has excellent adhesion, particularly adhesion at low heat, and furthermore excellent whitening resistance during deformation processing, food packaging materials, building materials, and lithium ion It can be suitably used as a packaging material which forms the exterior body of a battery, etc. Moreover, the said single|monolayer or multilayer film shows favorable whitening resistance also in the deformation|transformation processing at high speed and deep drawing processing. |