Patent ID: 7318985

Claim:
A composition for photosensitive flexographic plates, comprising a block copolymer composition for photosensitive flexographic plates an ethylenically unsaturated compound and a photopolymerization initiator, wherein the block copolymer composition comprises: at least one kind of block copolymer (a) selected from block copolymers represented by the following general formulae (a1) to (a3), and a block copolymer (b) represented by the following general formula (b): (A-B) 2 X (a1) (A-B) 3 X (a2) (A-B) 4 X (a3) A-B (b) wherein A is a polymer block of an aromatic vinyl monomer, B is a polymer block of a conjugated diene monomer, and X is a residue of a coupling agent having two or more functional groups of at least one kind selected from an alkoxyl group, an ester group and an epoxy group in the general formulae a1, a2, a3 and b, and which satisfies the following relationships: Wa=50 to 100% by weight, Wb=0 to 50% by weight, and 2.5≦(2×W2+3×W3+4×W4)/(W2+W3+W4)≦3.8, wherein Wa, W2, W3, W4, and Wb are the contents, in terms of % by weight, of (a),(a1),(a2), (a3), and (b), respectively.