Block copolymer composition, film, and method for producing block copolymer composition

A block copolymer composition comprising a block copolymer A represented by the following Formula (A) and a block copolymer B represented by the following Formula (B), wherein a weight ratio (A/B) between the block copolymer A and the block copolymer B is 36/64 to 85/15:

• Ar1a−Da−Ar2a (A)
• (Arb−Db)n−X (B),
• in the Formulae (A) and (B), Ar1a and Arb each represent an aromatic vinyl polymer block having a weight average molecular weight of 6,000 to 15,000;
• Ar2a represents an aromatic vinyl polymer block having a weight average molecular weight of 40,000 to 400,000;
• Da and Db each represent a conjugated diene polymer block having a vinyl bond content of 1 mol % to 20 mol %;
• X represents a residue of a coupling agent;
• and n represents an integer of 3 or greater.

A block copolymer composition comprising a block copolymer P represented by the following Formula (P), a block copolymer Q represented by the following Formula (Q), and a block copolymer R represented by the following Formula (R):

• Ar1p−Dp−Ar2p (P)
• (Arq−Dq)2−Xq (Q)
• (Arr−D)m−Xr (R),
• in the Formulae (P), (Q) and (R), Ar1p, Arq and Arr each represent an aromatic vinyl polymer block having a weight average molecular weight of 6,000 to 20,000;
• Ar2p represents an aromatic vinyl polymer block having a weight average molecular weight of 40,000 to 400,000;
• Dp, Dq and Dr each represent a conjugated diene polymer block having a vinyl bond content of 1 mol % to 20 mol %;
• Xq represents a single bond, or a residue of a coupling agent;
• Xr represents a residue of a coupling agent;
• and m represents an integer of 3 or greater.