PHOTOPOLYMERIZABLE COMPOSITION FOR THE PRODUCTION OF FLEXOGRAPHIC PRINTING FORMS FOR CORRUGATED BOARD PRINTING

摘要

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