Radiation-polymerizable composition and element containing a photopolymerizable acrylic monomer

摘要

This invention relates to a radiation polymerizable composition for use in a photographic element such as a lithographic printing plate comprising in admixturePP(a) a binder resin having the general formula ##EQU1## wherein a plurality of each of components A, B and C occur in ordered or random sequence in the resin and wherein A is present in said resin at about 5% to about 20% by weight and comprises groups of the formula ##STR1## B is present in said resin at about 4% to about 30% by weight and comprises groups of the formula ##STR2## and C is present in said resin at about 50% to about 91% by weight and comprises acetal groups consisting of groups of the formulae ##STR3## where R is lower alkyl or hydrogen, and wherein said group I is present in component C from about 75% to about 85%, group II is present in component C from about 3% to about 5%; and group III is present in component C from about 10% to about 22%;PP(b) a photoinitiator; andP P(c) an acrylic monomer having one or more unsaturated groups.