Light-sensitive printing plate for waterless offset printing

Details Light-sensitive printing plate for waterless offset printing Light-sensitive printing plate for waterless offset printing

G - Physics

03

F

96/189

G03F 7/022 (2006.01) G03F 7/021 (2006.01) G03F 7/075 (2006.01)

Patent

CA 1285416

Abstract of the Disclosure A light-sensitive printing plate for waterless offset printing is comprised of a layer carrier, a light- sensitive layer containing a diazonium salt polycondensation product, and of an ink-repellent crosslinked silicone elastomer layer superimposed on the light-sensitive layer, wherein the diazonium salt poly- condensation product comprises recurrent A-N2X and B units which are mutually linked by bridge members, preferably methylene groups, derived from carbonyl compounds capable of condensation, A being the radical of an aromatic diazonium compound capable of condensation with formaldehyde and B being the radical of a compound, in particular an aromatic amine, a phenol, a phenol ether, an aromatic thioether, an aromatic hydrocarbon, an aromatic heterocyclic compound or an organic acid amide, that is free of diazonium groups and that is capable of condensation with formaldehyde. The printing plate can be readily developed with developers which contain organic solvents, to give printing forms with good resolution, good ink repellency in the background areas, and long print runs.

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