Dye-containing layer of a photopolymerizable mixture, and...

Details Dye-containing layer of a photopolymerizable mixture, and... Dye-containing layer of a photopolymerizable mixture, and...

G - Physics

03

F

96/155, 96/266

G03F 7/105 (2006.01)

Patent

CA 1252330

- 29 - Abstract of the Disclosure: A layer of a photopolymeriz- able mixture for the production of relief plates and printing plates contain (a) one or more photopolymeriz- able olefinically unsaturated compounds, (b) one or more photoinitiators which, on exposure, initiate rapid photo- polymerization in the layer, and (c) a combination, which on exposure does not initiate any appreciable photopoly- merization in the layer and comprises (c1) a soluble acridinium, phenothiazinium, phenoxazinium or phenazinium dye and (c2) a mild reducing agent for the dye (c1). The layer gives an improved relief image (greater shadow well depths) in the production of relief plates, and is also advantageous in the production of gravure printing plates. On exposure, it undergoes a color change which faci- litates evaluation of the exposed layers before development.

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