Patent ID: 8288080

Claim:
A photopolymerizable flexographic printing element for producing hard flexographic printing plates comprising a dimensionally stable substrate; and a photopolymerizable, relief-forming layer comprising, based in each case on the total amount of all components of said photopolymerizable, relief-forming layer, 40 to 90% by weight of a binder comprising at least one thermoplastic elastomeric block copolymer which comprises at least one block formed from an alkenyl aromatic and at least one block formed from a 1,3-diene; 0.1 to 20% by weight of at least one ethylentically unsaturated monomer M; 0.1 to 5% by weight of a photoinitiator; and 1 to 40% by weight of a plasticizer; wherein monomer M comprises at least one di(meth)acrylate M1 of formula H 2 â•CRâ€”C(O)Oâ€”R 2 â€”O(O)Câ•CH 2 wherein R is H or a methyl group; and R 2 is a divalent alicyclic hydrocarbon radical comprising 10 to 20 carbon atoms, and wherein said photopolymerizable, relief-forming layer, after exposure and photopolymerization, has a hardness of at least 66Â° Shore A.