Photosensitive, flexo printing element and method for the production of newspaper flexo printing plates

摘要

The present invention relates to a photosensitive flexographic printing element for the production of flexographic newspaper printing plates, comprising at least a flexible, metallic support, an adhesive layer applied thereto, a photopolymerizable layer which can be developed in organic media and which itself comprises at least one elastomeric binder, ethylenically unsaturated monomers, a photoinitiator or photoinitiator system and a plasticizer, a transparent substrate layer, and optionally a removable protective film, where the total thickness of the flexographic printing element is from 300 to 1000 μm, the elastomeric binder has a weight average molecular weight M_w of from 80,000 to 150,000 g/mol and a Shore A hardness of from 50 to 80, and the amount of plasticizer is from 5 to 50% by weight, based on the amount of all constituents of the photopolymerizable layer, and to a process for the production of flexographic newspaper printing plates by imagewise exposure of the flexographic printing element to actinic light, followed by development and drying at from 105 to 160° C.