| abstract |
The resin composition of the present invention has 35 to 59.9 parts by mass of a propylene-based polymer (A) satisfying the following (a) and 25 to 40 parts by mass of a soft propylene-based copolymer (B) satisfying the following (b). , 0.1 to 10 parts by mass of polyolefin (C) containing a structural unit derived from unsaturated carboxylic acid and / or a derivative thereof, and 15 to 30 parts by mass of an ethylene-based polymer (D) satisfying the following (d). (However, the total of (A), (B), (C) and (D) is 100 parts by mass), and measured at 230 ° C. and 2.16 kg load in accordance with ASTM D-1238. The resulting MFR is 7 g / 10 minutes or more and 25 g / 10 minutes or less. (A) The melting point (Tm) observed in the differential scanning calorimetry is 120 ° C. or higher. (B) The MFR measured at 230 ° C. and 2.16 kg load according to ASTM D-1238 is in the range of 0.01 to 100 g / 10 minutes, and the following requirements (b-1) and (b-2) ) Satisfies. (B-1) The melting point (Tm) observed in the differential scanning calorimetry is 110 ° C. or lower, or the melting point is not observed. (B-2) It has a structural unit derived from propylene and a structural unit derived from ethylene and at least one olefin selected from α-olefins having 4 to 20 carbon atoms, and has ethylene and 4 carbon atoms. The content of the structural unit derived from at least one α-olefin selected from ~ 20 is 30 mol% or less, and the isotactic triad fraction (mm fraction) measured by 13C-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, and at 190 ° C., 2 in accordance with ASTM D-1238. The MFR measured under a .16 kg load is in the range of 0.1-10 g / 10 min. The single-layer or multilayer film containing a layer formed from the resin composition of the present invention is excellent in adhesiveness, particularly adhesiveness at a low calorific value, and further excellent in whitening resistance during deformation processing, and is used as a food packaging material or It can be suitably used as a packaging material for forming a building material, an exterior body of a lithium ion battery, and the like. Further, the single-layer or multilayer film exhibits good whitening resistance even in high-speed deformation processing and deep drawing processing. |