Photopolymerizable composition for the production of flexographic printing forms for corrugated board printing

摘要

Photopolymerisable mixture (I), containing (a) elastomeric binder(s), (b) photopolymerisable, ethylenically unsaturated compound(s) and (c) photoinitiator system(s). Mixture (I) contains at least one radial (polystyrene-polybutadiene)nX block copolymer (II) with an average mol. wt. (Mw) of 80,000-300,000 and an Mw/Mn ratio of 1.00-1.40, in which X = tin or silicon and n = 2 or 4, which contains less than 15 wt% di-block copolymer and is extended with up to 50 wt% paraffin oil(s). Also claimed is (i) a photopolymerisable printing plate with (A) a film base, (B) photopolymerisable layer(s) consisting of (I) and (C) an outer cover, and (ii) a flexographic printing form made from this plate.