Patent ID: 8722800

Claim:
A composition for a stretchable film, comprising a block copolymer composition containing a block copolymer A represented by the following general formula (A) and a block copolymer B represented by the following general formula (B), and a polyolefin-based thermoplastic resin: Ar 1 a -D a -Ar2 a (A) (Ar b -D b ) n -X (B), in the general formulas (A) and (B), Ar1 a and Ar b each represent an aromatic vinyl polymer block having a weight average molecular weight of 6,000 to 20,000; Ar2 a represents an aromatic vinyl polymer block having a weight average molecular weight of 40,000 to 400,000; D a and D b each represent a conjugated diene polymer block having a vinyl bond content of 1 mol % to 20 mol %; X represents a single bond or a residue of a coupling agent; and n represents an integer of 2 or greater, wherein a weight ratio (A/B) of the block copolymer A and the block copolymer B in the block copolymer composition is 36/64 to 80/20.