Light-sensitive mixed diazonium condensate printing plate for wa

Details Light-sensitive mixed diazonium condensate printing plate for wa Light-sensitive mixed diazonium condensate printing plate for wa

1986-12-17

1988-10-04

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Diazo reproduction, process, composition, or product

Composition or product which contains radiation sensitive...

430155, 430157, 430303, G03C 154, G03C 160, G03C 176, G03F 708

Patent

active

047756071

ABSTRACT:
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 polycondensation product comprises recurrent A-N.sub.2 X 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.

REFERENCES:
patent: 3849392 (1974-11-01), Steppan
patent: 3867147 (1975-02-01), Teuscher
patent: 4631245 (1986-12-01), Pawlowski

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