METHOD OF FORMING IMAGE FOR PREEINTENSIFIED POSITIVE WORKING SHEET MATERIAL* COLOR PROOF PRINTING SHEET AND MULTIICOLOR PROOF PRINTING SHEET

摘要

ABSTRACTA presensitized positive acting sheet capableof providing both overlay and single sheet color pre-press proofing. The overlay system utilizes a sheetstructure comprising a clear colorless transparent backinghaving a coating thereon of an appropriate pigmentedpolyvinyl acetal resin and a light sensitive layerthereover comprising a poly-complex oxygenated anion-diazonium salt. In the single sheet proofing system, theaforementioned structure also contains a barrier layer,and typically a pressure sensitive adhesive layer.