PROCESS FOR BROMINE SURFACE TREATMENT OF PHOTOSENSITIVE ELASTOMERIC FLEXOGRAPHIC PRINTING PLATES

摘要

Process for providing improved solvent resistant surfaces of relief flexographic printing plates prepared by imagewise exposure and liquid development of the unexposed areas of a layer of a photosensitive elastomeric composition comprising a polymer of a conjugated diolefin hydrocarbon, and a monomeric compound wherein, after drying, the developed surface is in either order (1) postexposed to actinic radiation, and (2) contacted for about 15 seconds to 40 minutes with an aqueous treatment solution of an alkali monopersulfate, e.g., 2KHSO5.KHSO4.K2SO4 and a bromide salt, e.g., potassium bromide.