Digitally imageable flexo-printing plate with integrated barrier layer

A digitally imageable, photopolymerizable flexographic printing element comprising, disposed one above another in order, at least

• (A) a dimensionally stable support,
• (B) at least one photopolymerizable, relief-forming layer having a layer thickness of 300 to 7000 μm, comprising at least one elastomeric binder, an ethylenically unsaturated monomer, and a photoinitiator or a photoinitiator system,
• (C) an oxygen-blocking barrier layer which is transparent to UVA light and has a layer thickness of 0.3 to 5 μm,
• (D) a laser-ablatable mask layer having a layer thickness of 0.3 to 5 μm, comprising at least one elastomeric binder and a material which absorbs UV/VIS light, and
• (E) a removable outer film,
• wherein:
• the layers (B), (C) and (D) are soluble or dispersible in an organic solvent,
• the barrier layer (C) comprises at least one oxygen-blocking binder and an oligomeric or polymeric basic adhesion component,
• the elastomeric binder of the laser-ablatable mask layer (D) is at least one selected from the group consisting of a polyamide, a polyvinyl acetate, an ethylene-vinyl acetate copolymer, a partially hydrolyzed polyvinyl acetate, a polyurethane, a nitrocellulose, and a polyvinylacetal,
• the basic adhesion component of the barrier layer (C) is an oligomeric or polymeric polyvinylamine or polyethylenimine.