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AssigneeE. I. Du Pont de Nemours and Company
InventorsRobert R. Gruetzmacher, Stanley H. Munger, Peter F. Warfield
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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., 2KHSO.sub.5.KHSO.sub.4.K.sub.2 SO.sub.4 and a bromide salt, e.g., potassium bromide.
A process for modifying the surfaces of relief flexographic printing plates wherein the reliefs are prepared by imagewise exposure with actinic radiation 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 nongaseous ethylenically unsaturated compound containing at least one terminal ethylenic group, the improvement, wherein after drying, the developed surface is, in either order,
Dependencies are inferred from the claim text.