METHOD OF MAKING A LITHOGRAPHIC PRINTING PLATE

专利名称：METHOD OF MAKING A LITHOGRAPHIC

PRINTING PLATE

发明人：Alexander Williamson申请号：US12094285申请日：20061115

公开号：US20090047603A1公开日：20090219

摘要：A method of making a lithographic printing plate includes the steps of: (a)providing a lithographic printing plate precursor including a support having a hydrophilicsurface or which is provided with a hydrophilic layer, and a coating on the support, thecoating including (i) at least one image-recording layer which includes a photocurablecomposition, the composition including a compound which is capable of forming freeradicals upon image-wise exposure, and (ii) on top thereof, an oxygen-barrier layerincluding a water-soluble or water-swellable polymer, (b) image-wise exposing thecoating, (c) optionally, heating the precursor in a pre-heating unit, (d) treating the image-wise exposed precursor with water or an aqueous solution to remove at least a portionof the oxygen-barrier layer, thereby increasing the oxygen permeability of the coating tosuch an extent that curing of the non-exposed areas of the coating by ambient light isinhibited by quenching of free radicals with oxygen, (e) mounting the treated precursoron a plate cylinder of a lithographic printing press, and (f) developing the precursor byrotating the plate cylinder while feeding dampening liquid and/or ink to the coating,thereby removing non-exposed areas of the image-recording layer.

申请人：Alexander Williamson

地址：Mortsel BE

国籍：BE

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