Method of making lithographic aluminium offset printing plates

Details Method of making lithographic aluminium offset printing plates Method of making lithographic aluminium offset printing plates

G - Physics

03

C

G03C 8/04 (2006.01) G03C 8/32 (2006.01)

Patent

CA 2054827

GV1735 GV1735 ABSTRACT METHOD OF MAKING LITHOGRAPHIC ALUMINIUM OFFSET PRINTING PLATES Method for making lithographic aluminium offset printing plates according to the DTR-process by photo-exposing a photosensitive monosheet layer assemblage comprising a hydrophilic aluminium foil, an intermediate layer comprising hydrophobic polymer beads prepared by polymerization of ethylenically unsaturated monomer(s) and having an average diameter not lower than 0.2 µm, and a silver halide emulsion layer, applying an aqueous alkalinesolution to the photo-exposed silver halide emulsion layer in the presence of a developing agent and a silver halide solvent to form a silver image and to allow unreduced silver halide or complexes formed thereof to diffuse image- wise from the developed silver halide emulsion layer to said aluminium foil to produce thereon a silver image, and separating said emulsion layer and said intermediate layer from the imaged aluminium foil. The invention also relates to the photosensitive monosheet layer assemblage used for making such printing plates.

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