| abstract |
A photopolymerizable composition for the preparation of flexographic printing forms for corrugated board direct printing comprising a radial (polystyrene-polybutadiene)n X block copolymer, with X = Sn or Si and n = 2 or 4, with an average molecular weight (M w) of 80,000-300,000, a molecular weight distribution (M w/M n) of 1.00-1.40, a content of di- block copolymers of less than 15% by weight, which is extended up to 50% by weight of a paraffinic oil. |