Ethylenically-unsaturated dextrin composition for preparing a durable hydrophilic photopolymer

摘要

A water-soluble photopolymerizable composition which is suitable for forming the hydrophilic layer in a positive acting water-developable lithographic printing plate. The photopolymerizable composition comprises a mixture of: (a) an ethylenically-unsaturated dextrin oligomer, (b) at least one hydroxyfunctional acrylamide monomer, (c) inorganic solid particulate material, and (d) a photoinitiation system. Wetting agents and pH modifiers can also be added to the composition. The photopolymer formed from the composition is water-insoluble.