Patent ID: 8578852

Claim:
A block copolymer composition for flexographic printing plates, comprising a block copolymer A represented by the following Formula (A) and a block copolymer B represented by the following Formula (B), wherein a content of an aromatic vinyl monomer unit in the block copolymer A is 41% by weight or more: Ar1 a -D a -Ar2 a (A) (Ar b -D b ) n -X (B), wherein, in the Formulae (A) and (B), Ar1 a and Ar b each are an aromatic vinyl polymer block with a weight average molecular weight of 6000 to 20000, Ar2 a is an aromatic vinyl polymer block with a weight average molecular weight of 40000 to 400000, D a and D b each are a conjugated diene polymer block with a vinyl bond content of 1 to 20 mol %, X is a single bond or a residue of a coupling agent, and n is an integer of 2 or more.