Resin composition, adhesive, multilayer body, surface protection film, method for producing surface protection film, and method for protecting surface

A resin composition (X) comprising:

• a 4-methyl-1-pentene/α-olefin copolymer (A-1) satisfying following requirements (a) and (b);
• a 4-methyl-1-pentene/α-olefin copolymer (A-2) satisfying following requirements (c) and (d);
• and
• a thermoplastic resin (B) other than the copolymer (A-1) and the copolymer (A-2),
• wherein a total content of the copolymer (A-1) and the copolymer (A-2) is 2 to 50% by mass, and a content of the thermoplastic resin (B) is 50 to 98% by mass, based on 100% by mass of a total of the copolymer (A-1), the copolymer (A-2), and the thermoplastic resin (B):
• (a) when a total of a structural unit (i) derived from 4-methyl-1-pentene and a structural unit (ii) derived from an α-olefin having 2 to 20 carbon atoms excluding 4-methyl-1-pentene is 100 mol %, a content of the structural unit (i) is 65 to 80 mol %, and a content of the structural unit (ii) is 20 to 35 mol %;
• (b) a melting point observed by a differential scanning calorimeter is lower than 110° C. or not observed;
• (c) when a total of the structural unit (i) derived from 4-methyl-1-pentene and the structural unit (ii) derived from an α-olefin having 2 to 20 carbon atoms excluding 4-methyl-1-pentene is 100 mol %, a content of the structural unit (i) is 80 to 90 mol %, and a content of the structural unit (ii) is 10 to 20 mol %;
• and
• (d) a melting point observed by a differential scanning calorimeter is 110 to 160° C.