Block copolymer composition for flexographic plate

A flexographic plate comprising a photosensitive composition for a flexographic plate comprising a block copolymer composition for a flexographic plate, an ethylenically unsaturated compound having a molecular weight of 5,000 or less, and a photopolymerization initiator, wherein:

• the block copolymer composition for a flexographic plate includes a block copolymer A represented by the following general formula (A) and a block copolymer B represented by the following general formula (B),
• a content of aromatic vinyl monomer units relative to all monomer units constituting polymer components of the block copolymer composition for the flexographic plate is 18% to 70% by mass;
• a type A hardness is 25 to 65;
• and
• an anisotropic index is 2.0 or less:
• Ar1b-Da-Ar2a (A)
• (Arb-Db)n-X (B)
• in the general formula (A) and the general formula (B), Ar1a and Arb each represent an aromatic vinyl polymer block having a weight average molecular weight of 6,000 to 20,000;
• Ar2a represents an aromatic vinyl polymer block having a weight average molecular weight of 25,000 to 400,000, a ratio (Mw(Ar2a)/Mw(Ar1a)) of the weight average molecular weight of Ar2a and the weight average molecular weight of Ar1a is 2 to 20;
• Da and Db each represent a conjugated diene polymer block having a vinyl bond content of 21% to 70% by mol;
• X represents a single bond or a residue of coupling agent;
• and n represents an integer of 2 or more.