LONG-RUNNING WATER DEVELOPABLE PRINTING PLATES AND COMPOSITIONS

摘要

Water developable planographic printing plates comprising a substrate having a water developable photocurable coating layer thereon can have a long press life in the water softenable binder components comprises less than 10% by weight of the coating layer, at least 50% by weight of all ethylenically unsaturated monomers comprise oligomeric materials having a molecular weight in excess of 500 and more than two ethylenically unsaturated groups, and is the ratio of ethylenically unsaturated materials with a molecular weight of less than 500 to organic solvent soluble film forming binder in the composition is less than 1/0.6.