RESIN COMPOSITION AND MONOLAYER AND MULTILAYER FILMS

A resin composition according to the present invention comprises 35 to 59.9 parts by mass of a propylene polymer (A) satisfying (a) below; 25 to 40 parts by mass of a soft propylene copolymer (B) satisfying (b) below; 0.1 to 10 parts by mass of a polyolefin (C) containing a structural unit derived from an unsaturated carboxylic acid and/or a derivative thereof; and 15 to 30 parts by mass of an ethylene polymer (D) satisfying (d) below (provided that the total of (A), (B), (C), and (D) is 100 parts by mass), wherein an MFR measured at 230°C and a load of 2.16 kg according to ASTM D-1238 is 7 g/10 min or more and 25 g/10 min or less. (a) A melting point (Tm) observed by differential scanning calorimetry is 120°C or more. (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 and the following requirements (b-1) and (b-2) are satisfied: (b-1) a melting point (Tm) observed by differential scanning calorimetry is 110°C or less, or no melting point is observed; and (b-2) a constitutional unit derived from propylene and a constitutional unit derived from at least one olefin selected from ethylene and α-olefins having 4 to 20 carbon atoms are contained, a content of the constitutional unit derived from at least one α-olefin selected from ethylene and α-olefins having 4 to 20 carbon atoms is 30 mol% or less, and an isotactic triad fraction (mm fraction) measured by 13C-NMR is 80% or more. (d) It is 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 an MFR measured at 190°C and a load of 2.16 kg according to ASTM D-1238 is in the range of 0.1 to 10 g/10 min. A monolayer film or a multilayer film comprising a layer formed of the resin composition according to the present invention has high adhesiveness, particularly high adhesiveness at a low enthalpy, and further has high whitening resistance during deformation processing, and can be suitably used as a packaging material for forming packaging materials for food products, construction materials, and packaging materials for lithium ion batteries. Moreover, the monolayer film or multilayer film also exhibits good whitening resistance during deformation processing or deep drawing at high speed.